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Molybdenum Isotope Fingerprinting of Microbial Sulfate Reduction in Seep Carbonate Rocks Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-03-18 Zice Jia, Yu Hu, Germain Bayon, Jörn Peckmann, Xudong Wang, Shanggui Gong, Jie Li, Harry H. Roberts, Duofu Chen, Dong Feng
Understanding the interaction between molybdenum (Mo) and organic matter during microbial sulfate reduction is critical for the use of Mo to reconstruct marine redox conditions throughout Earth's history. However, little is known about Mo isotope fractionation and how it relates to organic matter remineralization during microbial sulfate reduction. Here, we report Mo abundances and isotopic (δ98Mo)
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Uncertainty Quantification in Geochemical Mapping: A Review and Recommendations Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-03-18 J. Wang, R. Zuo
Geochemical mapping is a crucial tool that can provide valuable insights for a wide range of applications, including mineral resources prospecting, environmental impact assessment, geological process understanding, and climate change research. Despite its significance, geochemical mapping requires spatial modeling based on sparse, heterogeneous, and potentially inaccurate data sets. Moreover, the underlying
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Deep Fault-Controlled Fluid Flow Driving Shallow Stratigraphically Constrained Gas Hydrate Formation: Urutī Basin, Hikurangi Margin, New Zealand Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-03-16 Andrew R. Gorman, Gareth J. Crutchley, Dylan R. Baker, Douglas R. A. Fraser, Stuart A. Henrys, Anne M. Tréhu, Robert N. Harris, Benjamin J. Phrampus, Ingo A. Pecher
The Hikurangi Margin east of New Zealand's North Island hosts an extensive gas hydrate province with numerous gas hydrate accumulations related to the faulted structure of the accretionary wedge. One such hydrate feature occurs in a small perched upper-slope basin known as Urutī Basin. We investigated this hydrate accumulation by combining a long-offset seismic line (10-km-long receiver array) with
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A Simple, Low-Blank Batch Purification Method for High-Precision Boron Isotope Analysis Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-03-15 M. Trudgill, S. Nuber, H. E. Block, J. Crumpton-Banks, H. Jurikova, E. Littley, M. Shankle, C. Xu, R. C. J. Steele, J. W. B. Rae
Boron (B) isotopes are widely used in the Earth sciences to trace processes ranging from slab recycling in the mantle to changes in ocean pH and atmospheric CO2. Boron isotope analysis is increasingly achieved by multi-collector inductively coupled plasma mass spectrometry, which requires separation of B from the sample matrix. Traditional column chromatography methods for this separation have a well-established
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Volcanic Ash Classification Through Machine Learning Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-03-14 Damià Benet, Fidel Costa, Christina Widiwijayanti
Volcanic ash provides information that can help understanding the evolution of volcanic activity during the early stages of a crisis and possible transitions toward different eruptive styles. Ash consists of particles from a range of origins within the volcanic system and its analysis can be indicative of the processes driving the eruptive activity. However, classifying ash particles into different
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Behavior of Amagmatic Orogenic Geothermal Systems: Insights From the Agua Blanca Fault, Baja California, Mexico Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-03-13 Daniel Carbajal-Martínez, Christoph Wanner, Larryn W. Diamond, Loïc Peiffer, John M. Fletcher, Claudio Inguaggiato, Manuel Contreras-López
Amagmatic geothermal systems within regional-scale orogenic faults are promising renewable resources for heat and possibly electricity production. However, their behavior needs to be better understood to improve their exploration and assessment of energy potential. To provide more insight, we report geochemical, geological, and geophysical studies from seven hot spring sites strung along a 90 km segment
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Chemistry, Growth, and Fate of the Unique, Short-Lived (2019–2020) Water Lake at the Summit of Kīlauea Volcano, Hawaii Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-03-12 P. A. Nadeau, S. Hurwitz, S. Peek, A. H. Lerner, E. F. Younger, M. R. Patrick, D. E. Damby, R. B. McCleskey, P. J. Kelly
Less than a year after the 2018 Kīlauea caldera collapse and eruption, water appeared in newly deepened Halemaʻumaʻu crater. The lake—unprecedented in the written record—grew to a depth of ∼50 m before lava from the December 2020 eruption boiled it away. Surface water heightened concerns of potential phreatic or phreatomagmatic explosions but also offered a new means of possibly identifying eruption
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Bayesian Estimation of Past Astronomical Frequencies, Lunar Distance, and Length of Day From Sediment Cycles Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-03-11 A. Malinverno, S. R. Meyers
Astronomical cycles recorded in stratigraphic sequences offer a powerful data source to estimate Earth's axial precession frequency k, as well as the frequency of rotation of the planetary perihelia (gi) and of the ascending nodes of their orbital planes (si). Together, these frequencies control the insolation cycles (eccentricity, obliquity and climatic precession) that affect climate and sedimentation
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3D Stresses and Velocities Caused by Continental Plateaus: Scaling Analysis and Numerical Calculations With Application to the Tibetan Plateau Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-03-07 Emilie Macherel, Ludovic Räss, Stefan M. Schmalholz
Understanding stresses is crucial for geodynamics since they govern rock deformation and metamorphic reactions. However, the magnitudes and distribution of crustal stresses are still uncertain. Here, we use a 3D numerical model in spherical coordinates to investigate stresses and velocities that result from lateral crustal thickness variations around continental plateaus like those observed for the
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Rapid Changes in Strength and Direction of Earth's Magnetic Field Over the Past 100,000 Years Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-03-07 Catherine G. Constable, Christopher J. Davies
Previous studies of rapid geomagnetic changes have highlighted the most extreme changes in direction and field strength found in paleomagnetic field models over the past 100 ky. Here we study distributions of rates of change in both time and space. Field models based on direct observations provide the most accurate values for rates of change, but their short duration precludes a complete description
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Metamorphic Inheritance, Lower-Crustal Earthquakes, and Continental Rifting Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-03-07 Å. Fagereng, J. F. A. Diener, C. J. Tulley, B. Manda
The Malawi Rift is localized within Precambrian amphibolite-granulite facies metamorphic belts, bounded by up to 150 km long border faults, and generates earthquakes throughout ∼40 km thick crust. Rift-related faults are inferred to exploit pre-existing weaknesses that allow rifting of otherwise dry and strong crust. It is unclear what these weaknesses are, and how localization into weak zones can
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Magma Evolution During Main-Phase Continental Flood Basalt Volcanism: A Case for Recharge-Evacuation-Assimilation-Fractional Crystallization in the Ethiopian Low-Ti Province Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-03-05 S. R. Krans, T. O. Rooney, J. W. Kappelman, G. Yirgu, D. Ayalew
Lavas erupted in Continental Flood Basalt (CFB) provinces are not primary magmas; they are differentiated products that result from large volumes of melt migrating and stalling in the lithosphere prior to eruption, resulting in complex liquid lines of descent. Geochemical models can be used to constrain the various influencers of magma differentiation (recharge, assimilation, fractional crystallization
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Authigenic Carbonate Burial Within the Late Devonian Western Canada Sedimentary Basin and Its Impact on the Global Carbon Cycle Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-03-06 Sean Gazdewich, Tyler Hauck, Jon Husson
Stable carbon isotope ratios (δ13C values) of marine carbonates are widely used to infer the relative burial rates of organic carbon, a source of oxygen to the ocean-atmosphere system. This inference, however, is based on the assumption that ocean-atmospheric carbon is buried either as organic carbon or as marine carbonate minerals. The burial of authigenic carbonate minerals formed within sediments
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Terrane Collision-Induced Subduction Initiation: Mode Selection and Implications for Western Pacific Subduction System Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-03-05 Fengyuan Cui, Zhong-Hai Li
In the regime of plate tectonics, the subduction of an oceanic plate generally terminates with the collision and accretion of continental terranes. Then, a new subduction zone may form in the neighboring oceanic plates, which is defined as the terrane collision-induced subduction initiation (SI). Based on the analyses of the western Pacific subduction system in the Cenozoic, three types of collision-induced
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A Lake Record of Geomagnetic Secular Variations for the Last 23 ka From Lake Chala: Toward a Composite Directional Lake Record of the Earth's Magnetic Field for Equatorial East Africa Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-03-05 A. Di Chiara, M. W. Hounslow, B. A. Maher, V. Karloukovski, M. Van Daele, M. Blaauw, D. Verschuren
The documentation and understanding of variations in the Earth's magnetic field through time is fundamental for several disciplines, but current geomagnetic models rely on datasets heavily biased toward the mid- and high northern latitudes. The African continent and surrounding islands and oceans are particularly underrepresented. Here, we present a new record of paleo-secular variation (PSV) of the
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Combined Genomic and Imaging Techniques Show Intense Arsenic Enrichment Caused by Detoxification in a Microbial Mat of the Dead Sea Shore Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-03-04 C. Thomas, M. Filella, D. Ionescu, S. Sorieul, C. G. L. Pollier, A. M. Oehlert, P. Zahajská, N. Gedulter, A. Agnon, D. Ferreira Sanchez, D. Ariztegui
Microbial mats and microbialites are essential tools for reconstructing early life and its environments. To better understand microbial trace element cycling, a microbial mat was collected from the sinkhole systems of the western shores of the Dead Sea, a dynamic environment exhibiting diverse extreme environments. Intense arsenic enrichment was measured (up to 6.5 million times higher than current
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3D Diffusion of Water in Melt Inclusion-Bearing Olivine Phenocrysts Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-03-04 Euan J. F. Mutch, Megan E. Newcombe, John F. Rudge
Olivine-hosted melt inclusions are an important archive of pre-eruptive processes such as magma storage, mixing and subsequent ascent through the crust. However, this record can be modified by post-entrapment diffusion of H+ through the olivine lattice. Existing studies often use spherical or 1D models to track melt inclusion dehydration that fail to account for complexities in geometry, diffusive
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Magma Differentiation in Dynamic Mush Domains From the Perspective of Multivariate Statistics: Open- Versus Closed-System Evolution Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-03-04 A. Pontesilli, F. Di Fiore, P. Scarlato, B. Ellis, E. Del Bello, D. Andronico, J. Taddeucci, M. Brenna, M. Nazzari, O. Bachmann, S. Mollo
Open-conduit conditions characterize several of the most hazardous and active volcanic systems of basaltic composition worldwide, persistently refilled by magmatic inputs. Eruptive products with similar bulk compositions, chemically buffered by continual mafic inputs, nevertheless exhibit heterogeneous glass compositions in response to variable magma mixing, crystallization, and differentiation processes
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A Comprehensive Assessment of Submarine Landslides and Mass Wasting Processes Offshore Southern California Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-03-04 Maureen A. L. Walton, James E. Conrad, Antoinette G. Papesh, Daniel S. Brothers, Jared W. Kluesner, Mary McGann, Peter Dartnell
It is critical to characterize submarine landslide hazards near dense coastal populations, especially in areas with active faults, which can trigger slope failure, subsequent tsunamis, and damage seabed infrastructure during earthquake shaking. Offshore southern California, numerous marine geophysical surveys have been conducted over the past decade, and high-resolution bathymetric and subsurface data
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A High-Resolution Seismic Catalog for the Southern Apennines (Italy) Built Through Template-Matching Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-03-04 G. Diaferia, L. Valoroso, L. Improta, D. Piccinini
The incompleteness of earthquake catalogs is a well-known issue caused by our technical limitation in detecting the small-to very small-magnitude seismicity falling near or below the background seismic noise. The detection of small-magnitude events is fundamental for improving our knowledge of geometry and kinematics of seismogenic sources and the spatio-temporal characteristics of seismicity, thus
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Implications of Flat-Slab Subduction on Hydration, Slab Seismicity, and Arc Volcanism in the Pampean Region of Chile and Argentina Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-03-01 Xiaowen Liu, Lara S. Wagner, Claire A. Currie, Mark J. Caddick
The Pampean flat slab in central Chile and Argentina is characterized by the inland migration and subsequent cessation of arc volcanism since the mid-Miocene. Slab flattening also affects the distribution and number of intermediate-depth earthquakes and the evolution of the overlying continental thermal structure. In this study, we combine thermal-mechanical models with petrological models to examine
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Diffuse Venting and Near Seafloor Hydrothermal Circulation at the Lucky Strike Vent Field, Mid-Atlantic Ridge Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-28 Benjamin Wheeler, Mathilde Cannat, Valérie Chavagnac, Fabrice Fontaine
We report on a 3 years monitoring experiment of low to medium temperature diffuse venting at two vent sites (Tour Eiffel and White Castle) of the Lucky Strike, black smoker-type hydrothermal field, Mid-Atlantic Ridge. Diffuse vents account for a large part of the energy flux of mid-ocean ridges hydrothermal fields and provide key habitats for the hydrothermal fauna. We document the time and space variability
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Fluid-Driven Mass Transfer During Retrograde Metamorphism and Exhumation of the UHP Western Gneiss Region Terrane, Norway Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-03-01 D. Z. Shulaker, S. M. Gordon, J. Hammerli, J. W. DesOrmeau
Dehydration reactions within subducted oceanic crust are important for fluid-mediated element transfer within the subducting plate and potentially to the mantle wedge. The effects of metamorphic reactions and fluid flow on element recycling that occur during retrogression and exhumation of subducted continental crust from mantle depths are poorly understood. We study two metabasite pods with fresh
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Magnetotelluric Imaging of the Central Himalayan Crust Away From Rift Zones Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-27 Gang Wang, Hui Fang, Qing Lei, Xinxue Xu, Hongda Liang, Yaoyang Zhang
Imaging the crustal structure and state of the Himalayan Orogenic Belt (HOB) is of great significance for understanding crustal deformation and its tectonic response in the collision front of the Indian-Eurasian plates. To avoid the influence from the anomalies underneath the north-south trending rifts, a three-dimensional electrical resistivity model across the central HOB was obtained between the
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Issue Information Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-26
No abstract is available for this article.
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Geochemical Characteristics of Thermal Springs and Insights Into the Intersection Between the Xiaojiang Fault and the Red River Fault, Southeastern Tibet Plateau Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-26 Weiye Shao, Zhaofei Liu, Ying Li, Zhi Chen, Chang Lu, Ciping Zhao, Yun Wang, Qilin Li, Zihan Gao, Yili Luo, Hua Ran, Shaohui Fan
During the ongoing uplift and expansion of the southeastern margin of the Tibetan Plateau, the front edge of the Sichuan-Yunnan rhombic block (SYB) has experienced intense tectonic activity and frequent seismicity. In this study, the fluid geochemistry in the primary active faults at the front edge of the SYB was investigated, with the aim of understanding the tectonic activity and intersection relationship
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Exhumed Serpentinites and Their Tectonic Significance in Non-Collisional Orogens Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-23 Damián Donoso-Tapia, Kennet E. Flores, Celine Martin, Esteban Gazel, Jeffrey Marsh
Exhumed serpentinites are fragments of ancient oceanic lithosphere or mantle wedge that record deep fluid-rock interactions and metasomatic processes. While common in suture zones after closure of ocean basins, in non-collisional orogens their origin and tectonic significance are not fully understood. We study serpentinite samples from five river basins in a segment of the non-collisional Andean orogen
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Trace Element Partitioning Between Saline Aqueous Fluids and Subducted Metasediments, and the Origin of the “Sediment Fingerprint” in Arc Magmas Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-22 M. Putak Juriček, A. Audétat, H. Keppler
Isotopic and elemental signatures in arc magmas bear similarities to marine sediments from the forearc. Partial melts of subducted sediments were previously invoked as the predominant carrier of material between the slab and mantle wedge, whereas aqueous fluids were deemed too inefficient at mobilizing trace elements to account for arc magma compositions. However, trace element solubility in aqueous
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Geochemical and Isotopic (Nd, Sr) Tracing of the Origin of REE Enrichment in the Cambrian Georgina Basin Phosphorites Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-20 Diana Zivak, Carl Spandler, Matthew Valetich
Phosphorites of the Georgina Basin (northern Australia) are an established economic source of phosphate and have recently been recognized to be a potential source of rare earth elements (REE). Previous bulk-rock geochemistry work focused on the eastern margin of the basin revealed that phosphorites from the southern region have significantly higher (up to 0.5%) REE contents than equivalent prospects
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How Strong/Weak Is Epidote Relative to Plagioclase? Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-20 Sarah Incel, Lisa Katharina Mohrbach, Jörg Renner
In natural lower crustal rocks, we observe that plagioclase breakdown is often partial as evidenced by the presence of epidote-group minerals and the absence of the remaining reaction products for example, kyanite and quartz. Due to the lack of experimental data on epidote deformation, it is unclear if this partial reaction would affect the strength of the plagioclase-rich lower continental crust.
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Active Tectonics, Quaternary Stress Regime Evolution and Seismotectonic Faults in Southern Central Hispaniola: Implications for the Quantitative Seismic Hazard Assessment Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-22 J. Escuder-Viruete, F. J. Fernández, F. Pérez Valera, F. McDermott
Present-day convergence between Caribbean and North American plates is accommodated by subduction zones, major active thrusts and strike-slip faults, which are probably the source of the historical large earthquakes on Hispaniola. However, little is known of their geometric and kinematic characteristics, slip rates and seismic activity over time. This information is important to understand the active
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Magmatic Evolution of the Fossil Melanesian Island Arc: Evidence From Lower Miocene Lavas of Malekula Island (Vanuatu) Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-22 K. M. Haase, K. P. Schneider, B. Pelletier, O. Ishizuka
The subduction zones in the SW Pacific Ocean are some of the most dynamic plate boundaries on Earth with changes in subduction polarity and subduction initiation processes. The New Hebrides island arc formed some 10 million years ago after the Melanesian island arc was abandoned due to the cessation of subduction of the Pacific Plate after collision of oceanic plateaus with the island arc. Parts of
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Coupled Geodynamical-Geochemical Perspectives on the Generation and Composition of Mid-Ocean Ridge Basalts Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-20 Thomas Duvernay, Shihao Jiang, Patrick W. Ball, D. Rhodri Davies
Owing to their abundance and relative availability on Earth's seafloor, mid-ocean ridge basalts (MORBs) have a well-defined chemical element budget, reflected by the low standard deviation associated with typical normal MORB (N-MORB) composition. However, the exact mechanisms leading to magma differentiation and MORB generation remain debated, which hinders our ability to evaluate MORB parental magma
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Characterizing the Complexity of Subduction Zone Flow With an Ensemble of Multiscale Global Convection Models Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-15 Samuel L. Goldberg, Adam F. Holt
Subduction zones are fundamental features of Earth's mantle convection and plate tectonics, but mantle flow and pressure around slabs are poorly understood because of the lack of direct observational constraints on subsurface flow. To characterize the linkages between slabs and mantle flow, we integrate high-resolution representations of Earth's lithosphere and slabs into a suite of global mantle convection
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Diagenesis Decreasing the Mo Isotopic Composition in Estuarine Systems: Implications for Constraining Its Riverine Input to Ocean Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-15 Zhibing Wang, Feng Ye, Jie Li, Jinlong Ma, Yiwei Chen, Xi Liu, Chao Huang, Ti Zeng, Gangjian Wei, Qingquan Hong
Understanding the geochemical behavior of the Mo isotopes in estuarine systems is essential for determining the isotopic composition of riverine inputs to the ocean and for assessing the historical oxidation state of Earth’s ancient oceans. However, the extent and mechanisms of Mo isotope fractionation during estuarine processes are not yet fully understood. This study systematically investigated the
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Transient and Steady-State Friction in Non-Isobaric Conditions Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-15 Sylvain Barbot
The frictional properties of faults control the initiation and propagation of earthquakes and the associated hazards. Although the ambient temperature and instantaneous slip velocity controls on friction in isobaric conditions are increasingly well understood, the role of normal stress on steady-state and transient frictional behaviors remains elusive. The friction coefficient of rocks exhibits a strong
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The LILY Database: Linking Lithology to IODP Physical, Chemical, and Magnetic Properties Data Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-14 Laurel B. Childress, Gary D. Acton, Vincent P. Percuoco, Margaret Hastedt
During each expedition of the International Ocean Discovery Program and its precursor, the Integrated Ocean Drilling Program (jointly referred to as IODP), vast arrays of data are collected from drill cores. These data, which are accessible from the IODP LIMS (Laboratory Information Management System) database, include physical, chemical, and magnetic properties collected semi-continuously along cores
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Identifying Distinct Pre-Eruptive Composition-H2O-Time Trends Using Plagioclase Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-15 Oliver Higgins, Tom Sheldrake
Macrocrysts (large crystals) in magmas offer a premier record of pre-eruptive magma storage conditions encoded in their chemistry and texture. Careful study of macrocryst zoning can deconvolve the conditions of crystal growth and the relative time a magma spends in a given physical-chemical state prior to eruption. Importantly, identifying discrete macrocryst zones requires consideration of both chemistry
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How Hydrothermal Cooling and Magmatic Sill Intrusions Control Flip-Flop Faulting at Ultraslow-Spreading Mid-Ocean Ridges Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-14 Arne Glink, Jörg Hasenclever
“Flip-flop” detachment mode represents an endmember type of lithosphere-scale faulting observed at almost amagmatic sections of ultraslow-spreading mid-ocean ridges. Recent numerical experiments using an imposed steady temperature structure show that an axial temperature maximum is essential to trigger flip-flop faults by focusing flexural strain in the footwall of the active fault. However, ridge
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Fluid Mixing and Spatial Geochemical Variability in the Lost City Hydrothermal Field Chimneys Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-13 Karmina A. Aquino, Gretchen L. Früh-Green, Stefano M. Bernasconi, Jörg Rickli, Susan Q. Lang, Marvin D. Lilley
Carbonate-brucite chimneys are a characteristic of low- to moderate-temperature, ultramafic-hosted alkaline hydrothermal systems, such as the Lost City hydrothermal field located on the Atlantis Massif at 30°N near the Mid-Atlantic Ridge. These chimneys form as a result of mixing between warm, serpentinization-derived vent fluids and cold seawater. Previous work has documented the evolution in mineralogy
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Controls on Mineral Formation in High pH Fluids From the Lost City Hydrothermal Field Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-11 Karmina A. Aquino, Gretchen L. Früh-Green, Stefano M. Bernasconi, Tomaso R. R. Bontognali, Anneleen Foubert, Susan Q. Lang
Although the serpentinite-hosted Lost City hydrothermal field (LCHF) was discovered more than 20 years ago, it remains unclear whether and how the presence of microbes affects the mineralogy and textures of the hydrothermal chimney structures. Most chimneys have flow textures comprised of mineral walls bounding paleo-channels, which are preserved in inactive vent structures to a varying degree. Brucite
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Uranium Redox and Deposition Transitions Embedded in Deep-Time Geochemical Models and Mineral Chemistry Networks Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-09 E. K. Moore, J. Li, A. Zhang, J. Hao, S. M. Morrison, D. R. Hummer, N. Yee
Uranium (U) is an important global energy resource and a redox sensitive trace element that reflects changing environmental conditions and geochemical cycling. The redox evolution of U mineral chemistry can be interrogated to understand the formation and distribution of U deposits and the redox processes involved in U geochemistry throughout Earth history. In this study, geochemical modeling using
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Degassing of Mantle-Derived Helium From Hot Springs Along the India-Asia Continental Collision Settings: Origins, Migration Velocity and Flux Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-09 Yinlei Hao, Qinghua Gong, Xingxing Kuang, Yuqing Feng, Hui Zhou, Chunmiao Zheng
Mantle-derived volatile degassing lacks quantitative evaluation in continental regions without active magmatism, such as the Tibetan Plateau. Ten new gas abundance and helium isotope data points combined with 286 hydrothermal volatile literature data points in India–Asia continental collision settings demonstrate widespread mantle-derived volatiles across the thick (∼70 km) crust. The mantle-derived
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Hydrothermal Plume Fallout, Mass Wasting, and Volcanic Eruptions Contribute to Sediments at Loki's Castle Vent Field, Mohns Ridge Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-08 A. Gartman, D. Payan, M. Au, E. P. Reeves, J. W. Jamieson, C. Gini, D. Roerdink
Sediments surrounding hydrothermal vents are important transition spaces between hydrothermal and pelagic environments. These sediments accumulate through diverse processes that include water column plume fallout, volcanic ash deposition, and mass wasting of hydrothermal chimneys and mounds superimposed upon background sedimentation which may originate from pelagic, terrestrial, and volcanic sources
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Overriding Plate Thickness as a Controlling Factor for Trench Retreat Rates in Narrow Subduction Zones Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-09 Pedro J. Gea, Flor de Lis Mancilla, Ana M. Negredo, Jeroen van Hunen
Slab width is a significant factor in controlling subduction zone dynamics, particularly the retreat velocities, which tend to decrease with wider slabs. However, observations of natural narrow subduction zones reveal no correlation between slab width and trench velocities. This suggests that other factors may exert a greater influence. In this study, we employ 3D numerical subduction models to systematically
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MYRIAM: Open-Source Software to Estimate Torque Variations Associated With Plate-Motion Temporal Changes Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-06 Valentina Espinoza, Juan Martin de Blas, Giampiero Iaffaldano
Tectonic plate motions are a prime constraint on lithosphere dynamics and on the torques acting upon plates. Researchers typically test hypotheses on the controlling torques via forward computer models, which allow accepting or rejecting hypotheses on the basis of the fit of model–output plate velocities to kinematic reconstructions. Such models typically require a significant amount of input information
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Assessment of Chalk as an Archive for the Lithium Isotope Composition of Seawater Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-07 Sandra J. Huber, Vanessa Schlidt, H.-Michael Seitz, Jorit F. Kniest, Jacek Raddatz, Horst R. Marschall, Silke Voigt
The understanding of silicate weathering and its role as a sink for atmospheric CO2 is important to get a better insight into how the Earth shifts from warm to cool climates. The lithium isotope composition (δ7Li) of marine carbonates can be used as a proxy to track the past chemical weathering of silicates. A high-resolution δ7Li record would be helpful to evaluate the role of silicate weathering
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Implications of Surface Heat Flux for Shear Stress and Temperature on the Plate Interface Beneath Northern Honshu Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-07 Philip England, Takumi Matsumoto, Simon Wallis
Measurements of surface heat flux from boreholes of the NIED Hi-net network of seismometers are used to determine temperature and shear stress on the plate interface beneath northern Honshu. At the maximum depth of thrust-faulting earthquakes, about 60 km, the temperature is 660 ± 240°C and the average shear stress during slip on the interface is 100 ± 45 MPa. The equivalent quantities from the oceanic
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Assessing the Accuracy of 2-D Planetary Evolution Models Against the 3-D Sphere Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-07 A. Fleury, A.-C. Plesa, C. Hüttig, D. Breuer
Regardless of the steady increase of computing power during the last decades, numerical models in a 3D spherical shell are only used in specific setups to investigate the thermochemical convection in planetary interiors, while 2D geometries are typically favored in most exploratory studies involving a broad range of parameters. The 2D cylindrical and the more recent 2D spherical annulus geometries
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Quantifying Benthic δ18O Lags Across Termination 1: A Probabilistic Approach Based on Radiocarbon and Benthic δ18O Chronologies Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-07 D. Rand, L. E. Lisiecki, T. Lee, C. W. Lawrence, G. Gebbie
Temporal offsets (“lags”) between benthic δ18O (δ18Ob) signals in different locations are not only a source of age model uncertainty during δ18Ob stratigraphic alignment but also provide an opportunity to improve reconstructions of deep ocean circulation change during Termination 1 (T1). While methods based on the visual identification of identical δ18Ob features have previously been used to estimate
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Using Element/Ca Response to Cleaning in Foraminifera From Endmember Depositional Environments to Infer Contaminants and Inform Pretreatment Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-07 Madelyn K. Cook, Ingrid L. Hendy
Past ocean conditions are often reconstructed using the elemental composition of foraminiferal calcite. However, foraminiferal remains are often impacted by post-depositional contaminants; thus, they require cleaning prior to element/Ca (El/Ca) analysis. To explore the impact of sample pretreatment on foraminiferal El/Ca ratios (Li, Na, Mg, Al, Mn, Fe, Zn, Sr, I, Ba, and U) we performed six cleaning
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Enrichment of Smectite in the REY-Rich Mud of the Clarion-Clipperton Fracture Zone in the Eastern Pacific and Its Geological Significance Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-06 Bo Xiang, Yanhui Dong, Xibin Han, Xiaohu Li, Yizhuo Wang, Weiyan Zhang, Fengyou Chu
REY-rich mud, consisting of deep-sea sediments with high concentrations of rare-earth elements and yttrium (REY), holds significant economic potential. Many studies have been conducted on biogenic apatite, ferromanganese micronodule, and phillipsite within these deposits to ascertain the REY enrichment mechanisms. However, the knowledge of clay minerals in REY-rich mud, which is the predominant component
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An Introduction to SGTPPR: Sparse Geochemical Tectono-Magmatic Setting Probabilistic MembershiP DiscriminatoR Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-06 Kenta Ueki, Hideitsu Hino, Tatsu Kuwatani
We present a new and easy-to-use geochemical tectono-magmatic setting discriminator to calculate the probability of membership (the Sparse Geochemical Tectono-magmatic setting Probabilistic membershiP discriminatoR, SGTPPR) that runs in Excel. It outputs the probability of membership for eight different tectono-magmatic settings (mid-ocean ridge, oceanic island, oceanic plateau, continental flood basalt
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Modern-Type Eolian Regime and Global Cooling-Modulated Dust Provenance in the Late Paleogene of Central-East Asia Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-05 K. Bohm, J. Wasiljeff, T. Stevens, J. Salminen, H. Tang, Y. Lahaye, M. Kurhila, Z. Zhang, O. Haugvaldstad, A. Kaakinen
Atmospheric mineral dust is a poorly constrained yet extremely important component of the climate system. Provenance studies from geologic dust archives are crucial to understand the drivers of the dust cycle over long time scales. Our multi-technique provenance analysis of a rare Paleogene (35–27 Ma) eolian dust sequence from Ulantatal, ∼400 km northwest of the Chinese Loess Plateau (CLP), shows that
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Detachment Fault-Hosted Subduction Re-Initiation of the (Ultra)Slow-Spreading Western Neo-Tethys in the Jurassic Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-05 Tong Liu, Chuan-Zhou Liu, Fu-Yuan Wu, Gültekin Topuz, Bo Wan, Jia-Min Wang, Guohui Chen
Subduction initiation in oceans is key to understanding regional and global plate tectonics and ocean basin dynamics; however, its genetic mechanism is still enigmatic. The most famous model that predicts intraoceanic subduction initiation along transform faults or fracture zones (i.e., the Subduction Initiation Rule) has been widely used to explain arc-like geochemical signatures within the Neo-Tethyan
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Extracting Meaningful Environmental and Age Information From a c. 2.4–2.2 Ga Peritidal Phosphorite: The Turee Creek Group, Western Australia Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-05 Georgia G. Soares, Joshua M. Garber, Christopher H. House, Jesse R. Reimink
Phosphorites can record oceanic conditions during their deposition, but the faithful retention of primary information in Paleoproterozoic deposits can be mitigated by post-depositional processes. Here, we examine a peritidal phosphorite within a microbialite reef complex in the 2.4–2.2 Ga Turee Creek Group in Western Australia to assess the environmental information retained. Field mapping and petrography
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Automated Detection and Machine Learning-Based Classification of Seismic Tremors Associated With a Non-Volcanic Gas Emission (Mefite d’Ansanto, Southern Italy) Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-05 S. Panebianco, C. Satriano, G. Vivone, M. Picozzi, A. Strollo, T. A. Stabile
A major aim in the study of crustal fluids is the development of automatic methodologies for monitoring deep-source, non-volcanic gas emissions’ spatio-temporal evolution. Crustal fluids play a significant role in the generation of large earthquakes and the characterization of their emissions on the surface can be essential for better understanding crustal processes generating earthquakes. We investigate
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Improving the Accessibility and Efficiency of Proton Irradiations for 4He/3He Thermochronology Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-02-03 C. L. Colleps, P. A. van der Beek, J. Amalberti, A. Denker, M. M. Tremblay, M. Bernard, A. H. Dittwald, J. Bundesmann
Synthesizing uniform and high concentrations of 3He within minerals via high-energy proton irradiation is paramount for 4He/3He thermochronology and helium diffusion kinetic studies. Proton irradiations of geological material have hitherto exclusively been routinely conducted at the Francis H. Burr Proton Therapy Center (FHB); we thus explored alternative irradiation protocols at two European-based
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Geochemical and Sr-Nd-Pb-Fe Isotopic Constraints on the Formation of Fe-Si Oxyhydroxide Deposits at the Ultraslow-Spreading Southwest Indian Ridge Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-01-30 Jiangtao Li, Mingxue Sun, Wenlong Qi, Zhe Zhou, Simon V. Hohl, Zhiwei He
Modern Fe-Si oxyhydroxide deposits occur in global marine hydrothermal vent sites. Despite their role as biogenic substrates and potential ore resources, much remains unknown about their formation processes. Here, we apply analyses of major and trace elements as well as Sr-Nd-Pb-Fe isotopes combined with 238U-230Th dating to Fe-Si oxyhydroxides obtained from several hydrothermal fields along the Southwest
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Sedimentary Records in the Lesser Antilles Fore-Arc Basins Provide Evidence of Large Late Quaternary Megathrust Earthquakes Geochemistry, Geophys. Geosystems (IF 4.48) Pub Date : 2024-01-31 C. Seibert, N. Feuillet, G. Ratzov, C. Beck, P. Morena, L. Johannes, E. Ducassou, A. Cattaneo, C. Goldfinger, E. Moreno, A. Bieber, G. Bénâtre, B. Caron, M. Caron, M. Casse, T. Cavailhes, G. Del Manzo, C. E. Deschamps, P. A. Desiage, Q. Duboc, K. Fauquembergue, A. Ferrant, H. Guyard, E. Jacques, M. Laurencin, F. Leclerc, J. Patton, J. M. Saurel, G. St-Onge, P. Woerther
The seismic potential of the Lesser Antilles subduction zone is poorly known and highly debated. Only two damaging earthquakes have been reported in the historical period, in 1839 and 1843, but their sources and magnitude are still uncertain. Global Navigation Satellite Systems and coral data contradict each other, and no conclusion has been reached on the coupling ratio of the plate interface. Given