Instituto de Geociencias

Geogenic controls and anthropogenic inputs on the seasonal hydrogeochemical variability of the Paraopeba River basin, Brazil

Abstract This study investigates the combined effects of geology, land use and land cover, hydrological seasonality, and disturbance history on the hydrogeochemistry of surface waters in the Paraopeba River Basin (PRB), located in Minas Gerais State, southeastern Brazil, and form...

Geochemical fingerprints and tectonic setting of the Late Palaeozoic marginal basin of the Bariloche Complex (SW Gondwana), North Patagonian Andes of Argentina

The understanding of the Late Palaeozoic evolution of the south-western Gondwana margin is limited due to a lack of outcrops and data. New insights were achieved by fieldwork, petrographic characterization and geochemical fingerprinting on metasedimentary and interlayered metabas...

Tracing source and paleoweathering conditions of the lower jurassic sandstone from sierra de santa rosa section, Northern Sonora, México

The Lower Jurassic sedimentary rocks of the Sierra de Santa Rosa Formation in northern Sonora, Mexico has been deposited in a forearc basin and its age has been assigned based on the fossil assemblages and detrital zircon U–Pb geochronology data. Neverthless, their geochemical ch...

Arc-related and high-grade dry metamorphic conditions of the Búzios Orogeny: A case study of. ∼500 Ma orthogranulites from Ilha Grande, Rio de Janeiro – Brazil

In situ U-Pb and Lu-Hf analyses performed by laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) on zircons and cathodoluminescence (CL) images were performed to isotopically characterize the granulitic metamorphism of the Ribeira Belt in Il...

Tracing metal sources in W-Sn deposits: Sr-Nd isotope geochemistry in wolframite, scheelite, and cassiterite from the Iberian Variscan Massif, Spain and Portugal

Abstract This study presents new TIMS Sr and Nd isotopic analysis of cassiterite, wolframite and scheelite from nine W-(Sn) and six Sn-(Ta-Li) vein-type deposits in the Iberian Variscan Massif, with the aim of constraining the source of metals in these deposits. Scheelite display...

Overwash processes: spatio-temporal scales and dynamics of the coastal system in southern Santa Catarina, Brazil

Abstract This study evaluated the influence of overwash processes on the dynamics of the coastal system in southern Santa Catarina, Brazil. The analysis was conducted at two temporal scales: monthly and interannual, to investigate the controlling factors in the formation of washo...

Empirical ground motion equations for the Eastern Alps, Austria

We present a new set of region-specific empirical Ground Motion Equations for the transition zone between the southern Vienna Basin and the Eastern Alps, the area with the highest seismic hazard in Austria. The equations include Intensity Prediction Equations for EMS-98 macroseis...

Epitactic Growthduring the Fluid-Driven Aragonite-to-CalciteTransformation

Abstract Aragonite and calcite (CaCO3) are the most abundant polymorphs of calcium carbonate in the Earth’s crust and are relevant industrial minerals. The factors that control the solid-state transformation of aragonite, the high-pressure polymorph, into calcite, the stable poly...