The shallow structures of the Chalco and Xochimilco sub-basins (southeastern Mexico Basin) are established based on a seismic line that stretches trough both depressions. Interpretation of the seismic line was constraint by the stratigraphic column cut by the approximately 3000 m deep Tulyehualco well. The seismic line was converted to depth based on a vertical transverse isotropy velocity model determined

Vertebrates that inhabited northern South America few million years after the Cretaceous-Paleogene (K-Pg) event are still poorly known. Here I present remains of turtles and crocodylomorphs from the lower to middle Paleocene, Lisama Formation of Colombia; representing the first record of Paleocene vertebrates for the Middle Magdalena Valley Basin, and one of the earliest Paleocene northern South American

Oil-producing rocks can be characterized by organic, inorganic and palynological geochemical parameters to assess the quantity and quality of organic matter. In the present study, samples of source rocks collected from different formations (Fm) from the sedimentary basins of the Parnaíba (Pimentairas Formation) and Paraná (Irati and Ponta Grossa Formations) were evaluated through the geochemical correlation

Low-grade metamorphic rocks show limitations in relation to the evaluation of weathering effects on macroscopic characteristics of the rock matrix due to their fine texture. In addition, the anisotropic character and high weathering impose difficulties in the preparation of samples for laboratory tests commonly used in the acquisition of physical and mechanical parameters for geotechnical purposes

This article seeks to contribute to the understanding of the dynamics and evolution of landforms, on a regional scale, from the application of morphometric indexes and structural analyzes, in the eastern portion of the Borborema Highlands, Northeast Brazil. The aim of this analysis is to minimize the subjectivities of the classifications and morphological hierarchies in the region in question. We sought

The Acre Basin has a complex geology that is related to the Andean uplift and it still is one of the least understood Brazilian sedimentary basins due in part to difficulties in accessing outcrops. Its geological history is related to several subandean basins including Marañon, Ucayali and Madre de Dios in Peru, and the Solimões Basin in Brazil. These basins have potential for oil and gas which raised

Analogue sand-box experiments have been set up to illustrate and analyze the control exerted by lithological heterogeneities on the evolution of a model fold-and-thrust belt (FTB). The structural architecture within many FTBs is highly sensitive to pretectonic obstacles (e.g. basement highs or intrusive bodies). To address FTB evolution with emphasis on the latter, we perform a series of experiments

Bimodal inversely zoned plutons were emplaced at the late stages in the Araçuaí Belt, composing a tectonic corridor following the Atlantic coast of Brazil. This work presents original geochemical and geochronological data from the Alto Chapéu pluton, a post-collisional pluton that belongs to the G5 Supersuite of the Araçuaí belt. It comprises inequigranular porphyritic granites and fine grained (monzo)

Identifying sources of terrestrial sediment to the ocean is important for watershed managers because of the harmful impacts of sediment on nearshore marine ecosystems. The Rio Loco watershed (RLW) in southwest Puerto Rico has been extensively modified, currently comprised of small mountainous rivers connected by reservoirs and irrigation canals to the Lajas Valley Agricultural Reserve (LVAR). The RLW

This study demonstrates the usefulness of palynofacies as a tool for characterizing the origin, transport, and settling of particulate organic matter preserved in fluvial plain sediments and its integration with diatoms for inferring past depositional environments. Palynofacies, diatoms, and organic geochemistry (S, C/S) data from a sediment core (PR07) collected from the Jucuruçu River valley in coastal

Peatlands are important chronological archives of paleoenvironmental changes, since they preserve materials which enable reconstruction of paleoenvironments from the Late Pleistocene. The Serra do Espinhaço Meridional (SdEM), located in the state of Minas Gerais, Brazil, can be considered one of the main areas of tropical mountain peatlands on Earth. When climate conditions are favorable, peatland

All published chronostratigraphic charts of the Espírito Santo basin, Brazil, show stratigraphic frameworks based on second-order depositional sequences. The absence of published high-resolution biostratigraphic analyses precludes the proposition of a higher order stratigraphic framework. This work breaks down the second-order depositional sequences, from Campanian to Maastrichtian succession in the

The Neoproterozoic Brasiliano Orogeny shaped the former São Francisco paleocontinent into a preserved cratonic nucleus surrounded by a pericratonic region. In central Brazil, this pericraton crops out as the Goiás Massif, the basement of the northern Brasília Belt. The well-known difficulty of tracing suture zones on surface led to a longstanding dispute on whether the Rio Maranhão Thrust, a structure

In complex aquifer systems subject to intensive exploitation it is important to investigate hydrogeochemical processes in the components to understand the hydrodynamics of groundwater. In this respect, understanding the hydrochemical mechanisms of water-rock interactions and mixing processes eventually leads to the development of appropriate strategies for a sustainable groundwater management. In this

Sustainable use of water resources on the behavior of groundwater table and surface water level variations, especially in phreatic sedimentary aquifers, where a strong interaction between stream flow and groundwater normally takes place. In the present study, precipitation, water level fluctuation, river flow and pivot installation data from an important agricultural frontier with an increasing water

The Coringa gold-silver (Cu–Pb–Zn) deposit, in southeastern Tapajós Mineral Province, is hosted in felsic volcanic rocks of the Vila Riozinho Formation and the Serra Alkali Feldspar Granite (hereafter Serra Granite). Field, petrographic, geochemical, and U–Pb, Lu–Hf, Sm–Nd data allowed us to constrain the magmatic evolution and tectonic setting of these units and surrounding volcano-plutonic sequences

Reservoirs hold a detailed record of the changes in the input of sediments and nutrients over decades to centuries. Paleolimnological multi-proxy analysis makes it possible to reconstruct baseline conditions to infer early evidence of environmental change. Our study aims to reconstruct historical human impacts derived from urban development on the San Roque reservoir (Córdoba, Argentina) related to

During Mid-Cenozoic times, voluminous and genetically heterogeneous volcanism took place across North Patagonia in response to a period of plate tectonic reorganization. One of these volcanic associations is represented by the El Maitén Belt, located to the east of the main Andes for over ~300 km. This volcanic belt reflects the evolution of a continental arc in an extensional setting with remarkable

A reassessment of the macroseismic intensities was performed for the Tumaco (December 12th, 1979, Mw = 8.1) and Armenia (January 25th, 1999, Mw = 6.1) earthquakes, based on the spatial distribution and quantification of dimensions of the surface geological and environmental effects in lists compiled from published documents. The newly constructed lists of 46 effects for the Tumaco earthquake (TE) and

The Northern Andes are the result of multiple tectonic phases, which include extensional and compressional volcanic arcs, strike-slip fragmentation, and accretion of exotic terranes. The alternations of these tectonic settings have overprinted and fragmented the geological record, which has hindered precise paleogeographic and tectonic reconstructions. In the western segment of the Colombian Andes

In this study, we examine the external part of the Magallanes-Malvinas Fold and Thrust Belt in offshore areas, including a portion in Tierra del Fuego onshore, in southern South America. Our investigations focus on the interaction between a thin-skinned fold and thrust belt and the basement in that deformation, considering pre-existing structures acting as stress risers and localizing a possible tectonic

In this work we study the evolution of one particular segment of the Southern Central Andes, the northern sector of the Malargüe Fold and Thrust Belt (34°–35° LS), where limited access to the western section has delayed its exploration for years. Analyses of the structure, stratigraphy and sedimentology of different sections along the fold and thrust belt added to the recognition and analysis of growth

In 2015 an extraordinary hydrometeorological event occurred in the southern Atacama Desert (northern Chile) that resulted in a catastrophic flood in the city of Copiapó. A large volume of detrital sediments was transported downstream, provoking an economic and environmental disaster in the Copiapó Valley, a region dominated by mining activity. Loads of sediment and residues were moved by the flow and

Acquisition of high-resolution geophysical spatial data at the Serra Branca canyon, in the Serra da Capivara National park, in the semiarid of the Northeastern Brazil, enables depicting deposits and relict landforms that have never been reported before for the area. Ground Penetrating Radar (GPR) and GPS real-time kinematics (RTK) enable uncovering wide cut-and-fill structures, a relict perched river

We analyze diagenesis of carbonate rocks from the Late Permian Chutani Formation of western Bolivia (San Pablo de Tiquina section) in the southern Lake Titicaca zone, which is a sedimentary succession of semiarid tidal flat comprised of mixed carbonate and siliciclastic units. The diagenetic study includes petrographic analysis (conventional petrography and cathodoluminescence) and geochemical analysis

Interatheriinae (Notoungulata, Interatheriidae) includes small, rodent-like, and cursorial mammal herbivores. They are known from the early Oligocene and became abundant during the early to middle Miocene in several South American localities. Throughout the late Miocene, interatheriines were only reported by a few remains from Argentinean outcrops. Here, we present a new finding from the Chiquimil

In this study, we propose a new stratigraphic framework for a well-preserved Paleoproterozoic succession of the Carajás Basin (Amazonian craton) in northern Brazil. A core-based facies analysis is coupled with a critical review of previous data on this succession. We are proposing that the studied succession, which was previously considered as a single lithostratigraphic unit called the Águas Claras

A new fossil apseudomorphan tanaidacean, Protoapseudoides espinalensis gen. et n. sp., from the Chiapas Region of Mexico, is described and placed within the new monotypic family Protoapseudoidae. Its description is based on more than 1000 specimens collected from the Lower Cretaceous (Aptian) in laminar dolomites from the El Espinal quarries (Sierra Madre Formation). The presence of a telsonic somite

This paper reports the composition and alteration products of pyroclasts in the Holocene Paredão volcano (pyroclast 1) and Late Quaternary Morro Vermelho Formation (pyroclasts 2 and 3) of Trindade Island, South Atlantic, Brazil using combined macromorphological, micromorphological, mineralogical and geochemical techniques. The pyroclasts 1 and 2 are interpreted as volcanic tuff breccia deposits, whereas

The Ipubi Formation of the Santana Group, Araripe Basin, Brazil, is characterized by black shales and overlying evaporite deposits and is suggested to record the transition from lacustrine to marine depositional environments. To date, the age of the black shales, constrained only by microfossils, is poorly determined, with ages spanning ~25 myrs from 125 to 100.5 Ma (Aptian-Albian). Here we present

This study describes and discusses bryozoan taxa and borings associated with carbonate fragments and bioclasts from Destacamento Río Salado Member, Canal de las Escobas Formation, mid-Holocene of northeastern Buenos Aires Province, Argentina. Three species of encrusting bryozoans were found co-occurring with borings: Biflustra puelcha, Conopeum reticulum and Electra arcuata comb. nov. In addition,

The precursor basin of the Araçuaí – West Congo Orogenic System (AWCO) formed a large gulf within the São Francisco – Congo Paleocontinent (SFCP), where sedimentary successions ascribed to the Jequitinhonha Complex and Macaúbas Group were deposited in the Neoproterozoic. This precursor basin system comprises an aborted continental rift of Early Tonian age and a Cryogenian rift that evolved to ocean-floor

The Pinos Volcanic Complex (PVC) is located in the San Luis Potosi Volcanic Field (SLPV) and southern region of the Mesa Central that includes Oligocene rhyolites and trachydacites. These felsic volcanic rocks are characterized by porphyritic textures with a main mineralogical arrangement of phenocrystals of quartz, potassium feldspar (sanidine), plagioclase and biotite embedded in a vitreous matrix

The early Jurassic volcanism of Central Patagonia covers an extensive area of 50,000 km2 where the volcanic deposits occur as isolated systems. The volcanic records form an elongated belt in which the composition, depositional and genetic features, show several differences along with its distribution. The Cañadón Chileno Complex (CCHC), located in the Río Negro province, provides the opportunity to

During Cenozoic times, Patagonia was characterized by an intense magmatic intraplate activity that gave rise to a large volume of basaltic flows and intrusive bodies. This work aims to gather all the available information along with unpublished data of the authors about this magmatism that crops out in the center and south of the Chubut Province, Patagonia Argentina. Small outcrops of Paleocene basalts

High-resolution seismoacoustic and multibeam data revealed a large field of sediment waves covering the Santa Catarina Plateau on the Brazilian Southern Margin. Within the field several zones were determined: a zone of large sediment waves (up to 70 m in height), a zone of smaller sediment waves (15–30 m in height) and a zone of buried sediment waves. The correlation of the seismoacoustic and multibeam

New geological and geochronological (Pb-Pb evaporation) data from the Vila Jussara suite, a representative of the Neoarchean granitoids of the Carajás province, southeastern Amazonian craton (Brazil), are discussed. The Vila Jussara suite crops out as a series of coalescing plutons elongated in the E-W direction. These plutons generally have sigmoidal shapes, and steep dips (75–85°) that follow the

New detailed structural data from the Fuegian Andes including new ages and cross-cutting relationships with intrusive rocks, as well as an appraisal of published structural data, support that this orogen evolved as a basement-involved thrust-fold belt after initial formation in an arc-continent collision scenario. New structural data from a deformed 84 Ma intrusive indicate that structures from the

Cerro Domuyo, in northwestern Neuquén province of Argentina, shows notable geothermal activity, although it is located at a considerable distance from the actual volcanic arc. Many studies have been developed in this area with the aim of investigating its geothermal field. Despite these efforts, the characterization of the dynamic activity in the area is still poorly known. This work shows the results

Geological and climatic events are widely understood to affect biodiversity, especially in the species-rich rainforests of Greater Amazonia, yet similar studies have lagged in less diverse regions of tropical South America. Here we assess the roles of paleogeographic and paleoenvironmental conditions on the formation of freshwater fish assemblages in the semi-arid regions of northeastern Brazil, in

This work intends to understand how the Ponta do Mel carbonate platform was implanted, to characterize its depositional model and its evolution in the light of modern stratigraphy, as well as to understand the stratigraphic relations with beneath, overlapping and contemporary units, from wells and seismic data. The focus area of this study corresponds to a belt in the offshore portion of the Potiguar

Fragments of turtle shell are known from several Upper Cretaceous formations in Mexico, including Corral de Enmedio and Packard Shale, Sonora; Aguja and Cerro del Pueblo, Coahuila; San Carlos, Chihuahua; El Gallo, Baja California; and Ocozocoautla, Chiapas. Turtles are important members of Upper Cretaceous vertebrate assemblages throughout North America and are considered a useful tool to define biogeographic

The Chubut River is a Patagonian river that flows from the Andes to the Atlantic Ocean, and is interrupted by a dam built at the middle valley. To investigate the sedimentary history of the lower river basin, a sediment core was collected from the floodplain. Fossil diatom assemblages contained within the core obtained at Gaiman village have been applied to a diatom-based inference model of conductivity

We examine three avian remains from the Última Esperanza cave complex. This site is a Natural Monument situated along the flanks of Cerro Benítez, Magallanes Region of Chile. A tarsometatarsus (MLP 94-VIII-10-12) is assigned to Rhea pennata, and a humerus (MLP 94-VIII-10-111) to Phalacrocorax brasilianus. Both, R. pennata and P. brasilianus, are currently distributed in the Magallanes Region, and their

U-series data are combined with major and trace element constraints to construct a detailed view of the magmatic system feeding the San Pedro-Linzor volcanic chain, aiding the understanding of how stratovolcanoes in extremely thick arc crust evolve. Lavas from the Quaternary San Pedro-Linzor volcanic chain (Central Andes) have (238U/230Th) ranging from 1.015 to 1.072, with 238U excess even in the less

Petrographic, mineralogical and geochemical analyses of mixed siliciclastic-carbonate offshore deposits of the Pilmatué Member (Neuquén Basin) were carried out to define two scenarios for deposition: a confined ramp setting (CRS) and an open ramp setting (ORS). The CRS involves marly to carbonate-rich fine-grained mudstones, mostly laminated and non-bioturbated, enriched in redox proxies and depleted

The knowledge on the Pleistocene biota that inhabited the Brazilian midwestern region is scarce and no data on the paleoecology of Eremotherium laurillardi from this region have been published so far. The main objective of this study is to provide information about the age and feeding ecology of that taxon from Goiás state and to compare the results with other localities from the Brazilian Intertropical

Calcretes and palustrine carbonates are two types of continental carbonates that contain significant environmental information and can be found in nearshore environments. In three stratigraphic sections studied in the coastal area of the Yucatan Peninsula and the island of Cozumel, multiple levels of calcretes and palustrine carbonates were identified. The presence of these continental carbonates combined

Developing countries face more impacts due to natural hazards because of rapid urbanization, natural resources overexploitation, and lack of territorial management. Mexico City is one of the most populated metropolitan areas of the world and in addition, due to its geophysical dynamics and increasing vulnerability, is frequently impacted by natural disasters. Every year, various natural hazards affect

Explosive volcanic eruptions generate a range of physical processes with great hazard potential. Subsequent fluvial processes have major effects on channel and valley-floor geometry, potentially resulting in extreme sediment and large wood (LW) yields. The associated impacts can be severe, both immediately and in the longer term as river channels are permanently reworking the large volumes of their

Submarine geomorphic features on the active margin along the Mexican Pacific coast are the result of subduction process. We analyze bathymetric data and present an overview of the continental slope geomorphology in the Guerrero seismic gap. For the first time we identify and describe submarine landforms in this area, including small-scale forearc basins, trench basin segmentation, narrow accretionary

In central-western Argentina, a belt including marine metasedimentary rocks and mafic-ultramafic bodies occurs throughout the western margin of the Precordillera. The belt is considered as the suture zone between the poorly known Chilenia terrane and the Cuyania terrane, part of the composite West Gondwana margin. It is assigned to the Late Neoproterozoic-Early Devonian based on fossil fauna and radiometric

The Dharwar Craton developed progressively over a billion years, through two main stages of crustal growth separated by a few-hundred million year long period of relative quiescence. The first stage between 3.4 and 3.0 Ga developed a proto-craton, which was considerably amplified during the second main stage between 2.7 and 2.4 Ga, through extensive magmatism, tectonism, and crustal consolidation.

Despite recent efforts, the paleodiversity of the Neogene mammals in Chile remains poorly known, with several putative new species awaiting description. For example, previous studies suggest that the early to late Miocene mammalian assemblages from the Laguna del Laja fossiliferous locality (Cura-Mallín and Trapa-Trapa formations), which crop out in the Andean Cordillera of Chile (~37°), comprise dozens

We study translation, rotation, and strain of active tectonic blocks in Northeastern Venezuela from the Global Navigation Satellite System (GNSS) observations. Since the installation of the geodetic network in 2003, one of the goals was to place at least three observation sites at each tectonic block to study the deformation of each one. Based on this premise, we define at least seven blocks: Bergantín