{"type": "FeatureCollection", "features": [{"id": "10.1016/j.chemgeo.2021.120283", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-31T06:56:42Z", "type": "Journal Article", "created": "2021-04-27", "title": "Imprint of chemical weathering and hydrothermalism on the Ge/Si ratio and Si isotope composition of rivers in a volcanic tropical island, Basse-Terre, Guadeloupe (French West Indies)", "description": "Abstract   A significant portion of the disproportionally high chemical weathering flux in volcanic island arcs may originate from hydrothermal fluid-rock interaction, thereby compromising the accurate estimate of atmospheric CO2 consumption rates. The objective of this study is to evaluate how the riverine Ge/Si ratio and Si isotopes, two well-established tracers of weathering, respond to hydrothermal inputs. The work took place in Basse-Terre, Guadeloupe, a tropical volcanic island with a dense river network, high chemical weathering fluxes and various hydrothermal surface manifestations. We characterized the Ge/Si ratio and \u03b430Si of 15 thermal springs, nine non-impacted (NI) rivers and 13 hydrothermally-impacted (HI) rivers. The soil solution from a highly weathered soil profile (Ferralsol) and a clayey-rock corresponding to the material exposed in an extinct hydrothermal system were also measured. A new purification method was successfully developed in order to allow the reliable measurement of Si isotopes in SO42\u2212- and Cl\u2212-rich thermal spring and HI river waters by mass spectrometry. Basse-Terre's thermal springs have variable Ge/Si ratios (0.05\u201321.03\u00a0\u03bcmol.mol\u22121) and \u03b430Si (0.71\u20131.50\u2030), but with no apparent relationship to the water compositional type. The Ge/Si ratio (0.15\u20132.57\u00a0\u03bcmol.mol\u22121) and Si isotope composition (0.26\u20131.21\u2030) values of the NI rivers reveal differences in the watersheds' weathering degree. Dissolution of Ge- and 28Si-rich secondary minerals explains the high Ge/Si and isotopically light composition of the northern NI rivers draining strongly weathered terranes. The Ge/Si ratio and \u03b430Si values measured for the NI and HI rivers overlap, implying that they cannot be used to diagnose hydrothermal contributions to river basins unambiguously. However, when combined with the Cl\u2212 and SO42\u2212 concentrations, the analysis of Ge and Si in the HI rivers suggests that water seeping through an extinct hydrothermal system produces SO4-rich drainages with distinctively lower Ge/Si ratios than those inferred for watersheds receiving thermal spring discharges associated with an active hydrothermal system. Overall, our results provide new constraints for applying and interpreting Ge/Si and Si isotope measurements to study weathering in volcanic environments.", "keywords": ["[SDE] Environmental Sciences", "Volcanic hydrothermal system", "Chemical weathering", "River geochemistry", "Si isotope", "Ge/Si ratio", "13. Climate action", "[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry", "Guadeloupe", "01 natural sciences", "6. Clean water", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://doi.org/10.1016/j.chemgeo.2021.120283"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Chemical%20Geology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.chemgeo.2021.120283", "name": "item", "description": "10.1016/j.chemgeo.2021.120283", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.chemgeo.2021.120283"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2021-09-01T00:00:00Z"}}, {"id": "10.1029/2021jf006064", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-31T06:58:23Z", "type": "Journal Article", "created": "2021-06-09", "title": "Controls on Physical and Chemical Denudation in a Mixed Carbonate\u2010Siliciclastic Orogen", "description": "Abstract<p>Mixed siliciclastic\uffe2\uff80\uff90carbonate active orogens are common on Earth's surface, yet most studies have focused on erosion and weathering in silicate\uffe2\uff80\uff90rich landscapes. Relative to purely siliciclastic landscapes, the response of erosion and weathering to uplift may differ in mixed\uffe2\uff80\uff90lithology regions. However, our knowledge of weathering and erosion in mixed carbonate\uffe2\uff80\uff90silicate lithologies is limited and, thus, so is our understanding of the mechanistic coupling between uplift, weathering, and the carbon cycle. Here, we partition denudation fluxes into erosion and weathering fluxes of carbonates and silicates in the Northern Apennines\uffe2\uff80\uff94a mixed carbonate\uffe2\uff80\uff90siliciclastic active orogen\uffe2\uff80\uff94using dissolved solutes, the carbonate sand fraction, and existing 10Be denudation rates. Erosion generally dominates total denudation fluxes relative to weathering by an order of magnitude. Carbonate and silicate contributions to erosion vary between lithologic units, but weathering fluxes are systematically dominated by carbonates. Silicate weathering may be kinetically limited, whereas carbonate weathering may be limited by acid supply. Carbonate re\uffe2\uff80\uff90precipitation estimated by comparing ion ratios (Sr, Ca, Na) from rivers and bedrock suggests that up to 90% of dissolved Ca2+ is lost from carbonate\uffe2\uff80\uff90rich catchments. Corresponding [Ca2+] estimates for the weathering zone are high, likely driven by high soil CO2 partial pressures (pCO2); however, re\uffe2\uff80\uff90equilibration with atmospheric pCO2 in rivers converts solutes back into grains that become part of the physical denudation flux. Weathering limits in this landscape therefore differ between the subsurface weathering zone and riverine exports, and our findings suggest that carbon cycle models may overestimate the sensitivity to erosion of solute exports (Ca2+ and HCO3\uffe2\uff88\uff92) derived from carbonate weathering.</p>", "keywords": ["mountain landscapes", "550", "Italy", "13. Climate action", "chemical Weathering; Italy; erosion; mountain landscapes; carbonate precipitation; lithology", "15. Life on land", "chemical Weathering", "erosion", "carbonate precipitation", "lithology", "01 natural sciences", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2021JF006064"}, {"href": "https://doi.org/10.1029/2021jf006064"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Journal%20of%20Geophysical%20Research%3A%20Earth%20Surface", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1029/2021jf006064", "name": "item", "description": "10.1029/2021jf006064", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1029/2021jf006064"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2021-01-15T00:00:00Z"}}, {"id": "10.5880/gfz.4.6.2021.001", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-05-31T07:04:47Z", "type": "Report", "title": "Major element stream water chemistry, compiled 10Be erosion rates, and analyses of weathering across an erosion-rate gradient in in southern Taiwan.", "description": "This dataset was used to analyse the link between chemical weathering and erosion rates across the southern tip of Taiwan. The weathering of silicate minerals is a key component of Earth\u2019s long-term carbon cycle, and it stabilises Earth\u2019s climate by sequestering carbon dioxide (CO2) from the atmosphere \u2013 thereby balancing CO2-emissions from the mantle. Conversely, the weathering of accessory carbonate and sulphides acts as a CO2 source. Chemical weathering is fundamentally dependent on the exposure of fresh minerals by erosion. With these data we investigated the link between the exposure of rocks by erosion and the chemical weathering of silicates, carbonates, and sulphides across a landscape with a significant erosion-rate gradient and comparatively little variation in runoff and lithology. This dataset includes new major element chemistry and water isotopes of river waters collected from across the southern tip of Taiwan as well as associated topographic and lithologic data (tab 1 in the excel table). Moreover, the data include a compilation of published 10Be-derived erosion rates from a subset of the sampled rivers (tab 2 in the excel file) and available major element chemistry from hotsprings in the region (tab 3 in the excel file). Using a mixing model, we derived the cation contributions from silicate and carbonate weathering as well as from hotspring and cyclic sources. Further, we estimated the erosion rates for each sample from the compiled 10Be data and the steepness of river channels, and we estimated saturation and pH in the weathering zone. For more information please refer to the associated data description file and especially to Bufe et al. (2021).", "keywords": ["erosion rate", "major element chemistry", "water isotopes", "EARTH SCIENCE &gt; SOLID EARTH &gt; GEOCHEMISTRY &gt; GEOCHEMICAL PROPERTIES &gt; ISOTOPE MEASUREMENTS", "EARTH SCIENCE SOLID EARTH GEOMORPHIC LANDFORMS PROCESSES FLUVIAL PROCESSES WEATHERING", "Taiwan", "hot springs", "15. Life on land", "EARTH SCIENCE &gt; SOLID EARTH &gt; GEOMORPHIC LANDFORMS/PROCESSES &gt; FLUVIAL PROCESSES &gt; WEATHERING", "rivers", "silicate and carbonate weathering", "Chemistry", "13. Climate action", "EARTH SCIENCE &gt; SOLID EARTH &gt; GEOCHEMISTRY &gt; GEOCHEMICAL PROCESSES &gt; CHEMICAL WEATHERING", "EARTH SCIENCE SOLID EARTH GEOCHEMISTRY GEOCHEMICAL PROPERTIES ISOTOPE MEASUREMENTS", "EARTH SCIENCE SOLID EARTH GEOCHEMISTRY GEOCHEMICAL PROCESSES CHEMICAL WEATHERING", "Natural Sciences"], "contacts": [{"organization": "Bufe, Aaron, Hovius, Niels, Emberson, Robert, Rugenstein, Jeremy K. C. , Galy, Albert, Hassenruck-Gudipati, Hima J., Chang, Jui-Ming,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.5880/gfz.4.6.2021.001"}, {"rel": "self", "type": "application/geo+json", "title": "10.5880/gfz.4.6.2021.001", "name": "item", "description": "10.5880/gfz.4.6.2021.001", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.5880/gfz.4.6.2021.001"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2021-01-01T00:00:00Z"}}, {"id": "2078.1/246033", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-31T07:06:03Z", "type": "Journal Article", "created": "2021-04-27", "title": "Imprint of chemical weathering and hydrothermalism on the Ge/Si ratio and Si isotope composition of rivers in a volcanic tropical island, Basse-Terre, Guadeloupe (French West Indies)", "description": "Abstract   A significant portion of the disproportionally high chemical weathering flux in volcanic island arcs may originate from hydrothermal fluid-rock interaction, thereby compromising the accurate estimate of atmospheric CO2 consumption rates. The objective of this study is to evaluate how the riverine Ge/Si ratio and Si isotopes, two well-established tracers of weathering, respond to hydrothermal inputs. The work took place in Basse-Terre, Guadeloupe, a tropical volcanic island with a dense river network, high chemical weathering fluxes and various hydrothermal surface manifestations. We characterized the Ge/Si ratio and \u03b430Si of 15 thermal springs, nine non-impacted (NI) rivers and 13 hydrothermally-impacted (HI) rivers. The soil solution from a highly weathered soil profile (Ferralsol) and a clayey-rock corresponding to the material exposed in an extinct hydrothermal system were also measured. A new purification method was successfully developed in order to allow the reliable measurement of Si isotopes in SO42\u2212- and Cl\u2212-rich thermal spring and HI river waters by mass spectrometry. Basse-Terre's thermal springs have variable Ge/Si ratios (0.05\u201321.03\u00a0\u03bcmol.mol\u22121) and \u03b430Si (0.71\u20131.50\u2030), but with no apparent relationship to the water compositional type. The Ge/Si ratio (0.15\u20132.57\u00a0\u03bcmol.mol\u22121) and Si isotope composition (0.26\u20131.21\u2030) values of the NI rivers reveal differences in the watersheds' weathering degree. Dissolution of Ge- and 28Si-rich secondary minerals explains the high Ge/Si and isotopically light composition of the northern NI rivers draining strongly weathered terranes. The Ge/Si ratio and \u03b430Si values measured for the NI and HI rivers overlap, implying that they cannot be used to diagnose hydrothermal contributions to river basins unambiguously. However, when combined with the Cl\u2212 and SO42\u2212 concentrations, the analysis of Ge and Si in the HI rivers suggests that water seeping through an extinct hydrothermal system produces SO4-rich drainages with distinctively lower Ge/Si ratios than those inferred for watersheds receiving thermal spring discharges associated with an active hydrothermal system. Overall, our results provide new constraints for applying and interpreting Ge/Si and Si isotope measurements to study weathering in volcanic environments.", "keywords": ["[SDE] Environmental Sciences", "Volcanic hydrothermal system", "Chemical weathering", "River geochemistry", "Si isotope", "Ge/Si ratio", "13. Climate action", "[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry", "Guadeloupe", "01 natural sciences", "6. 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