The Rio Doce magmatic arc, developed from ca. 630 to ca. 580 Ma on an active continental margin, linking the Araçuaí and Ribeira orogens in southeastern Brazil. The arc plutonic portion comprises the G1 supersuite, a calc-alkaline, magnesian, I-type pre-collisional rock-assemblage, mostly composed of tonalite to granodiorite, frequently containing dioritic to mafic enclaves, and their metamorphosed

The southern sector of the Paleoproterozoic Lourenço domain in the central-eastern region of the Amapá state, northern Brazil, consists mainly of Rhyacian granite-greenstone terranes with some Archean fragments. It is located at the transition with the Archean Amapá block, a Meso-Neoarchean continental landmass (2.85–2.60 Ga), strongly reworked during the Transamazonian orogeny (2.26–1.95 Ga). Geochemical

Northern Mexico is predominantly composed of moderately developed red soils that provide evidence of weathering, rubification, neoformation of clay, and pedogenic carbonate accumulation. These soils constitute a pedological unit named San Rafael Paleosol (SRP) which were developed during the late Pleistocene (MIS 2) to the middle Holocene (15,000–4500 cal years BP). These paleosols can use as a chronologic

Dual-polarity characteristic magnetizations in red sandstones of the Early and Middle Eocene El Bosque Formation in central Chiapas, Mexico (D = 9.3° I = 23.6°; N = 19 selected sites, k = 32.6, α95 = 6.0°) indicate about 20° of clockwise rotation when compared with a coeval paleomagnetic reference pole in the North America craton. We interpret the rotation to result from traction between the base of

Comparative analysis of mineralogy and post-depositional thermal evolution, as well as Sr–Nd and U–Pb on zircon isotope analysis of metapelites/pelites and sandstones of the Neoproterozoic to Paleozoic succession (Puncoviscana Complex, Mesón and Santa Victoria groups) in the Sierra de Mojotoro of northwestern Argentina has been conducted. Samples are mainly composed of different phyllosilicate minerals:

Representative rock-magnetic experiments and petrographic studies on remagnetized limestones and dolostones from the Upper Cambrian La Flecha Formation (Quebrada La Angostura, Precordillera of La Rioja, Argentina) carrying a pre-tectonic Permo-Triassic secondary magnetization are reported in order to improve the understanding of the pervasive Sanrafaelic overprint that reset the palaeomagnetic record

The index ichnofossil Treptichnus pedum Seilacher1955 and four types of Microbially Induced Sedimentary Structures (MISS) - variants of wrinkle and elephant skin structures – are the first fossils described from the Três Marias Formation, topmost unit of the Bambuí Group of south-central Brazil. Despite the stratigraphic importance and widespread occurrence of this unit in the São Francisco Craton

The Cretaceous rift to post-rift sedimentary sequences of the Paraná Basin and the Cenozoic sedimentary cover reflect the paleoclimate and tectonic influence on weathering and diagenesis, allowing to constrain provenance components. Detailed petrography enhanced by SEM and XRD, along with geochemistry of major, trace and rare earth elements provide a unique multi-technique approach. Weathering and

The Ventana Ranges and the neighboring Claromecó basin display multiple extensional and compressional tectonic events throughout their Phanerozoic evolution. A passive continental margin setting during the early Paleozoic changed to a compressional system in the late Paleozoic, for which the Ventana Ranges are its fossilized fold and thrust belt and the Claromecó Basin, to the north-northeast, its

The Quadrilátero Ferrífero (QF) is an important, polydeformed mineral province, located in the southernmost portion of São Francisco Craton. The Rio das Velhas greenstone belt (RVGB) is an Archean meta-volcano-sedimentary succession from the QF, the Córrego do Sítio unit (CdS) being its most widely distributed sedimentary sequence. Detailed sedimentology study allied to x-ray diffraction-XRD and geochronological

Micropedology studies by description of scanning electron microscopy images and electron micropobre analysis combined with field soil description, mineralogical, physical, and chemical laboratory analyses, can furnish valuable information about soil genesis in polar regions. The present study was carried out at Lions Rump (King George Island, Maritime Antarctica), where six pedons were selected to

The Andean basin formation across the Altiplano-Puna plateau has been mostly associated with: (i) interconnected depozones within a simple eastward-migrating foreland, (ii) isolated depocenters in a broken foreland or (iii) intermontane basins within a rising plateau setting. Particularly, the regions located further east from the western orogenic belts are key to disentangle these proposals. The Pozuelos

Desert varnish is a dark microlayer that forms on rocky surfaces that is usually associated with arid and desert environments. It consists mainly of clay minerals (60%), while the rest are Fe and Mn oxides. Growth rates are very slow and vary from <1 to 40 μm/ky. Although different proposals exist to explain their formation mechanisms, these processes are still unknown. Around the world, various groups

A paleomagnetic study was carried out in the Ordovician granitoids located in the northeastern North Patagonian Massif (NPM), close to Valcheta town (Río Negro Province, Argentina), to provide new evidence on the relation between Patagonia and Gondwana during the Early Paleozoic. A paleomagnetic paleopole (VA1) was calculated out of 14 VGPs yielding a mean at 12.7°N, 275.5°E with K = 13.3 and A95 = 11

Tunnel valleys are subglacial incisions formed mainly by meltwater erosion on soft sediment overridden by glaciers. Despite being common in the Pleistocene and Ordovician glacial record, where their fills constitute excellent aquifers and hydrocarbon traps, tunnel valleys are poorly recognized in late Paleozoic strata. Other types of glacial and non-glacial valleys, on the other hand, have been widely

Two granitic boulders from the Pennsylvanian Tarija Formation were sampled in order to perform laboratory analyses to define their possible provenance. This formation, deposited during the Late Paleozoic ice age (LPIA), represents the climax of glacial-related sedimentation in the Tarija Basin. The boulders were collected from massive diamictite levels in the Cerro Piedras locality, in Eastern Cordillera

A three-dimensional P and S-wave travel-time tomography, as well as Vp/Vs ratio images, were obtained for the southernmost tip of the Baja California Peninsula in Mexico. The area analyzed include Los Cabos block and part of the Gulf coast. The tomography obtained reveals in detail the heterogeneities of the crustal seismic velocity structure of the Los Cabos block. Results show an overall low velocity

The São Francisco paleocontinent comprises Archean nuclei and Paleoproterozoic magmatic arcs which were amalgamated during Siderian to Orosirian thermal-tectonic events (ca. 2.4–2.0 Ga). Located in the Porteirinha domain, one of these Archean segments, the Riacho dos Machados metavolcanosedimentary sequence encompasses metamafites and metaultramafites intercalated with metasedimentary rocks. The metamafites

Although the Neuquén Basin (Argentina) has an extensive record of fossil vertebrates for the Upper Cretaceous, little is known about the Early Cretaceous vertebrate faunas. The Mulichinco Formation (early Valanginian), where some dinosaur bone sites were found, provides important additional insights into the composition of continental fauna of that age. Although osteological studies of sauropod and

The geological record of the eastern Sierras Pampeanas province, in the modern Andean broken foreland of Argentina can be divided into four main events: (1) Proterozoic to early Paleozoic collisional tectonics, (2) middle-late Paleozoic anorogenic magmatism, relief generation and glacial paleovalley formation followed by (3) a classical foreland filling in the Permian and two proximal alluvial sedimentation

The taxonomic study of brachiopods (Family Discinidae) from the upper part of the Manacapuru Formation (Lochkovian), south border of the Amazonas Basin, Brazil, allowed to recognize’ five species of Orbiculoidea: O. baini, O. bodenbenderi, O. excentrica, and two new species described herein: O. xinguensis sp. nov. and O. katzeri sp. nov. Besides, O. baini, O. bodenbenderi, and O. excentrica are recorded

The Jauru Formation fills a symmetric NNW-trending graben whose basement is represented by Calymmian granitic intrusions and the paleoprotorezoic and mesoproterozoic metavolcanic sequence of the Jauru Terrane. The graben represents an intracratonic basin with glacial siliciclastic sequence dominated by lake sediments consisting of conglomerates, fine sandstones, siltstones and shales. The Late Carboniferous

According to the current understanding, the adverse health effects of particulate matter (PM) are produced by oxidative stress processes. Hence, the oxidative potential (OP) can be used as an exposure metric for more accurate approaches to the health response to ambient PM. This work explores the relationship between respiratory deposition of size-segregated PM and OP in the city of Santiago, Chile

In South America, glyptodonts are recorded since the late Eocene to the early Holocene. Their fossil record is represented mainly by disarticulated osteoderms during the Eocene and Oligocene, whereas more complete skeletons appeared since the early Miocene. The characters from the dorsal surface of the osteoderms (e.g., figures, foramina, sulci) are used for systematic recognition and phylogenetical

New palynological assemblages from the CBM-001-ST-RS borehole, drilled in the Santa Terezinha coalfield, Rio Grande do Sul State are presented. The studied section is composed of the Rio Bonito, Palermo, Irati and Serra Alta formations, Permian units of the Paraná Basin. According to the stratigraphic distribution of guide-species and the general composition of the palynological associations, two palynozones

The coastal zone is a very dynamic region, constantly seeking to reach a state of equilibrium due to variations in the external forces. The shallow zone along the inner continental shelf known as the shoreface, can be divided into the upper and lower shoreface. While the former responds to processes operating across time spans ranging from that of a single event, such as storm, through to seasonal

The Guacha Corral shear zone (GCSZ) is one of the most prominent crustal-scale shear zones in the Eastern Sierras Pampeanas of Argentina, juxtaposing two different metamorphic terranes: the eastern hanging wall, which was metamorphosed in the 550-510 Ma Pampean Orogen, and the western footwall, metamorphosed in the 500-440 Ma Famatinian Orogen. In this study, the tectono-thermal evolution of the footwall

Particle size distribution (PSD) is one of the fundamental physical properties of clastic sediment. Although many mathematical models have been proposed to describe the PSD of sediment, the physical meaning behind model parameter characterization remains poorly understood, which means it is seldom used in studies of the environment, geomorphologic evolution, and related surface wind–sand processes

Lateglacial climatic oscillations exerted profound impacts on the Meuse fluvial system. In the Lower Meuse (southern Netherlands), geomorphological studies in the last decades mainly centred on Lateglacial vegetation evolution, channel pattern changes and river terrace formation. Little information has been reported about the paleohydrology and its relation with the regional climate conditions. This

Opencast mining has exacerbated land degradation in New Caledonia, a French archipelago located in the south-west Pacific Ocean. Developed since the 1880s, mining has become the major economic activity in some catchments, which strongly disrupted sediment dynamics. Reconstructing the temporal changes of sediment source contributions is essential to understand the driving factors of soil erosion in

Composite islands that originate from central bars are one of the most frequent types of islands in the Paraná River and in many large rivers in the world. The aim of this study is to highlight island-forming processes and the evolution of an island on a large anabranching tropical river over a period of 101–104 yr. Mutum Island in the Upper Paraná River, Brazil (mean discharge = 9000 m3 s−1), was

Tafoni are one of the most interesting weathering features developed in many areas of the world from tropical areas to polar ones such as Antarctica. Here, we present the results on 4 tafoni in similar conditions (aspect, slope, distance from the sea, elevation) and in the same granite close to the Italian Antarctic station at Mario Zucchelli Station (74°42′S). These tafoni were thermally monitored

Many glaciers in high-mountain regions exhibit a debris cover that moderates their response to climatic change compared to clean-ice glaciers. Studies that integrate long-term observations of debris-covered glacier mass balance, velocity, surface debris evolution and geomorphological changes (such as ponds and ice cliffs) are relatively few. This study used satellite imagery, ground-based photogrammetry

Curvilinear ridges are extensively identified on the surface of terrestrial planets and can be formed by volcanic, glacial, eolian, or fluvial processes. In the Qaidam Basin, NW China, a set of unique curvilinear ridges that have similar appearances as inverted channels but are dominated by sand deposits in their interiors has been identified. To reveal its formation mechanism, we analyzed their topography

A buried travertine deposit, identified in a well at Prima Porta (to the north west of Rome, Italy), was investigated using a multidisciplinary approach that included stable isotope geochemistry, mineralogy, petrography and radiometric dating. The travertine body is located just along the western boundary of the Tiber valley, a morpho-tectonic depression of extensional origin; it is associated with

An overview of the Late Pleistocene and Holocene stratigraphy of the southeastern White Sea region is presented in the paper, based upon the analysis of published data, new results, and correlation between marine and terrestrial archives. The Pleistocene stratigraphic record in the southeastern White Sea region begins with Mikulino Horizon, which comprises the whole MIS 5 and is composed of marine

Three major late Neoproterozoic global cryochrons mark the coldest climate state in Earth history, with glaciers covering most, if not all, continents. However, the terrestrial paleosurface temperature differential between cryochron and nonglacial interlude is unknown. Time-equivalent Cryogenian and Ediacaran sedimentary successions from South China and Oman show multiple negative excursions of the

The early-syntectonic 563.7 ± 6.1 Ma old Oamikaub diorite (Damara orogen, Namibia) consists of metaluminous, magnesian, calc-alkalic to calcic diorites, granodiorites and granites. Associated gabbro-diorites and gabbros belong to the Neikhoes metagabbro. Linear major and trace element variations imply that the rock suite evolved through fractional crystallization processes involving amphibole, biotite

This study presents a description of the El Niño Southern Oscillation (ENSO) and Pacific Decadal Variability (PDV) in a multi‐century preindustrial simulation of the Community Earth System Model version 2 (CESM2). The model simulates several aspects of ENSO relatively well, including dominant timescale, tropical and extra‐tropical precursors, composite evolution of El Niño and La Niña events, and ENSO

Forced mechanical lifting through cold pool gust fronts can trigger new convection, and, as previous work highlights, is enhanced when cold pools collide. However, as conceptual models show, the organisation of the convective cloud field emerging from two versus three colliding cold pools differs strongly. In idealised dry large‐eddy simulations we therefore compare collisions between two and three

In an attempt to advance the understanding of the Earth's weather and climate by representing deep convection explicitly, we present a global, four‐month simulation (November 2018 to February 2019) with ECMWF's hydrostatic Integrated Forecasting System (IFS) at an average grid spacing of 1.4 km. The impact of explicitly simulating deep convection on the atmospheric circulation and its variability is

The sea ice component of the Community Earth System Model version 2 (CESM2) contains new “mushy‐layer” physics that simulates prognostic salinity in the sea ice, with consequent modifications to sea ice thermodynamics and the treatment of melt ponds. The changes to the sea ice model and their influence on coupled model simulations are described here. Two simulations were performed to assess the changes