10.5880/fidgeo.2022.035 eng dataset GFZ German Research Centre for Geosciences datapub@gfz-potsdam.de http://www.gfz-potsdam.de Helmholtz-Centre Potsdam - GFZ German Research Centre for Geosciences Helmholtz-Centre Potsdam - GFZ German Research Centre for Geosciences pointOfContact 2023-06-23 urn:ogc:def:crs:EPSG:4326 Mineralogical and geochemical data of two weathering profiles in a Mediterranean and a humid climate region of the Chilean Coastal Cordillera 2023-06-23 revision doi:10.5880/fidgeo.2022.035 Hampl, Ferdinand J. Department of Applied Geochemistry, Technische Universität Berlin, Berlin, Germany author Schiperski, Ferry Department of Applied Geochemistry, Technische Universität Berlin, Berlin, Germany author Schwerdhelm, Christopher Geomicrobiology Group, Eberhard-Karls-University Tübingen, Tübingen, Germany author Stroncik, Nicole GFZ German Research Centre for Geosiences, Potsdam, Germany author Bryce, Casey School of Earth Sciences, University of Bristol, Bristol, United Kingdom author von Blanckenburg, Friedhelm GFZ German Research Centre for Geosiences, Potsdam, Germany author Neumann, Thomas Department of Applied Geochemistry, Technische Universität Berlin, Berlin, Germany author GFZ Data Services publisher This publication provides mineralogical and geochemical data of two 6-m-deep weathering profiles formed from granitic rock. They are located in different climate zones (Mediterranean and humid) and are close to the national parks of La Campana and Nahuelbuta in the Chilean Coastal Cordillera. Additional rock samples from adjacent boreholes were used to relate the regolith to the bedrock. The profiles were sampled in February and March 2020 as part of the German Science Foundation (DFG) priority research program SPP-1803 “EarthShape: Earth Surface Shaping by Biota”. The goal of this project is to obtain a holistic view on the interplay of the geosphere and the biosphere under different climatic conditions and to investigate weathering mechanisms. The aim of this publication is to provide the data basis for understanding the weathering processes that control the development of the profiles in relation to different climatic conditions. To this end, we measured the geochemistry with X-ray fluorescence, extracted Fe, Al and Si with oxalate/dithionite, determined the grain sizes by wet sieving and pipetting, measured the magnetic susceptibility, and analysed the mineral content of bulk samples and clay fractions with X-ray diffraction. The data are compiled in one Excel file and all results of the X-ray diffraction measurements are available as RAW- and TXT files. Hampl, Ferdinand J. ferdinand.j.hampl@tu-berlin.de ferdinand.j.hampl@tu-berlin.de pointOfContact Coastal Cordillera secondary minerals Critical Zone EarthShape weathering La Campana Nahuelbuta EARTH SCIENCE > SOLID EARTH > GEOCHEMISTRY > GEOCHEMICAL PROCESSES > CHEMICAL WEATHERING EARTH SCIENCE > SOLID EARTH > GEOCHEMISTRY > GEOCHEMICAL PROCESSES > MINERAL DISSOLUTION EARTH SCIENCE > SOLID EARTH > ROCKS/MINERALS/CRYSTALS > IGNEOUS ROCKS EARTH SCIENCE > SOLID EARTH > ROCKS/MINERALS/CRYSTALS > MINERALS NASA/GCMD Earth Science Keywords publication CC BY 4.0 CC BY 4.0 10.5194/esurf-11-511-2023 DOI IsSupplementTo 10.1130/0016-7606(2002)114%3C1143:WPMBAA%3E2.0.CO;2 DOI Cites 10.1016/0016-7037(87)90070-6 DOI Cites 10.3133/b1590A DOI Cites 10.2136/sssaj1967.03615995003100020020x DOI Cites 10.1038/s41598-021-90267-7 DOI Cites 10.1038/299715a0 DOI Cites 10.1016/j.catena.2018.06.002 DOI Cites 10.1016/S0016-7037(03)00382-X DOI Cites 10.1038/nmeth.2089 DOI Cites 10.1002/jpln.3591050303 DOI Cites 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IsDerivedFrom GFFJH00J3 IGSN IsDerivedFrom GFFJH00HZ IGSN IsDerivedFrom GFFJH00H0 IGSN IsDerivedFrom eng geoscientificInformation La Campana soil pit -71.0437 -71.0437 -33.0283 -33.0283 La Campana drilling site -71.0435 -71.0435 -33.0283 -33.0283 Nahuelbuta soil pit -72.9507 -72.9507 -37.7938 -37.7938 Nahuelbuta drilling site -72.9504 -72.9504 -37.7938 -37.7938 http://doi.org/10.5880/fidgeo.2022.035 WWW:LINK-1.0-http--link Data Access - DOI Data Access - DOI information Two 6-m-deep soil pits were manually dug next to boreholes. These boreholes reached the bedrock of the weathering profiles. Each soil pit was sampled by 20 bulk samples (approx. 3 kg/sample) to cover the entire soil pit profile. These samples were separated with a rotary splitter and sample aliquots were used for 1) grain size determination (sieving and pipetting) and clay separation at the Department of Applied Geochemistry and the Chair of Ecohydrology and Landscape Evaluation (Technische Universität Berlin, Germany), 2) oxalate and dithionite extraction (Fe, Al and Si) at the Chair of Soil Science (Technische Universität Berlin, Germany), 3) X-ray diffraction analysis (XRD) at the Department of Applied Geochemistry (Technische Universität Berlin, Germany), magnetic susceptibility measurements at the Department of Geosciences (University of Tübingen, Germany), and 4) X-ray fluorescence analysis (XRF) by Fluxana® (Bedburg-Hau, Germany). In addition to the soil pits, wireline rotary drilling (PQ3-sized crown; core diameter ~80 mm) with potable water was used to recover core runs of up to 1.5 m length and to reach the bedrock of the weathering profiles. Representative bedrock and weathered rock samples were separated from the core. Bedrock samples were processed like soil pit samples to analyse the bulk geochemistry and mineralogy, and polished sample slabs were geochemically mapped with micro-X-ray fluorescence at the Department of Applied Geochemistry (Technische Universität Berlin, Germany). Additionally, bedrock and weathered rock samples were impregnated with blue-dyed artificial resin and thin-sectioned for light-microscopical and electron microprobe investigations at the Department of Applied Geochemistry (Technische Universität Berlin, Germany) and the German Research Centre for Geosciences (Potsdam, Germany).