A global survey of radiogenic strontium isotopes in river sediments
International audience Radiogenic strontium isotopes are routinely used in provenance studies, but their application to sediments is often complicated by various grain size and weathering effects, which can influence measured 87Sr/86Sr ratios. Here, we report Sr isotopic data for a large number of s...
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Online Access: | https://hal-insu.archives-ouvertes.fr/insu-03197632 https://hal-insu.archives-ouvertes.fr/insu-03197632/document https://hal-insu.archives-ouvertes.fr/insu-03197632/file/1-s2.0-S0009254120304976-main.pdf https://doi.org/10.1016/j.chemgeo.2020.119958 |
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ftccsdartic:oai:HAL:insu-03197632v1 2023-05-15T15:15:05+02:00 A global survey of radiogenic strontium isotopes in river sediments Bayon, Germain Freslon, Nicolas Yoann, Germain Bindeman, Ilya .N. Trinquier, Anne Barrat, Jean-Alix Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) 2021-01 https://hal-insu.archives-ouvertes.fr/insu-03197632 https://hal-insu.archives-ouvertes.fr/insu-03197632/document https://hal-insu.archives-ouvertes.fr/insu-03197632/file/1-s2.0-S0009254120304976-main.pdf https://doi.org/10.1016/j.chemgeo.2020.119958 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.chemgeo.2020.119958 insu-03197632 https://hal-insu.archives-ouvertes.fr/insu-03197632 https://hal-insu.archives-ouvertes.fr/insu-03197632/document https://hal-insu.archives-ouvertes.fr/insu-03197632/file/1-s2.0-S0009254120304976-main.pdf doi:10.1016/j.chemgeo.2020.119958 info:eu-repo/semantics/OpenAccess ISSN: 0009-2541 Chemical Geology https://hal-insu.archives-ouvertes.fr/insu-03197632 Chemical Geology, Elsevier, 2021, 559, pp.119958. ⟨10.1016/j.chemgeo.2020.119958⟩ Nd-Sr isotopes World rivers Silicate weathering Biotite feldspars Grain-size fractions [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2021 ftccsdartic https://doi.org/10.1016/j.chemgeo.2020.119958 2021-10-23T23:48:48Z International audience Radiogenic strontium isotopes are routinely used in provenance studies, but their application to sediments is often complicated by various grain size and weathering effects, which can influence measured 87Sr/86Sr ratios. Here, we report Sr isotopic data for a large number of sediment samples (n = 61) from the world's largest rivers and other river catchments draining particular geological and climatic settings; using both clay-rich (<4 μm) and silt-size (4-63 μm) detrital fractions to re-examine the factors controlling their distribution in sediments. In agreement with previous studies, the detrital material transported by world rivers defines general inverse Nd-Sr isotope relationships, which provide further empirical evidence for the utility of radiogenic Sr isotopes in sediment provenance studies. In a novel departure, however, we show that the 87Sr/86Sr difference between paired clay- and silt-size fractions (Δ87Sr/86Sr Clay-Silt) relates to the degree of chemical alteration of river sediments, as inferred from various relationships with weathering indices, such as the CIA, WIP and Na2O/Al2O3. The weathering dependence of Δ87Sr/86Sr Clay-Silt appears to be mainly controlled by temperature. In sub-Arctic and temperate regions, river sediments systematically display positive Δ87Sr/86Sr Clay-Silt indicative of preferential alteration of biotite in soils. In contrast, in sub-tropical watersheds characterized by mean annual temperatures >20 °C, intense feldspar weathering leads to the preferential incorporation of unradiogenic Sr into secondary clay minerals; a process which results in negative Δ87Sr/86Sr Clay-Silt values. In addition to climate forcing, the degree of size-dependent Sr isotope decoupling is also shown to be dependent on the type of weathering regime in watersheds, being more pronounced in low-elevation environments (< 2000 m), where transport-limited conditions and the presence of thick soil sequences can be associated with intense silicate weathering, than in ... Article in Journal/Newspaper Arctic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Arctic Chemical Geology 559 119958 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Nd-Sr isotopes World rivers Silicate weathering Biotite feldspars Grain-size fractions [SDU]Sciences of the Universe [physics] |
spellingShingle |
Nd-Sr isotopes World rivers Silicate weathering Biotite feldspars Grain-size fractions [SDU]Sciences of the Universe [physics] Bayon, Germain Freslon, Nicolas Yoann, Germain Bindeman, Ilya .N. Trinquier, Anne Barrat, Jean-Alix A global survey of radiogenic strontium isotopes in river sediments |
topic_facet |
Nd-Sr isotopes World rivers Silicate weathering Biotite feldspars Grain-size fractions [SDU]Sciences of the Universe [physics] |
description |
International audience Radiogenic strontium isotopes are routinely used in provenance studies, but their application to sediments is often complicated by various grain size and weathering effects, which can influence measured 87Sr/86Sr ratios. Here, we report Sr isotopic data for a large number of sediment samples (n = 61) from the world's largest rivers and other river catchments draining particular geological and climatic settings; using both clay-rich (<4 μm) and silt-size (4-63 μm) detrital fractions to re-examine the factors controlling their distribution in sediments. In agreement with previous studies, the detrital material transported by world rivers defines general inverse Nd-Sr isotope relationships, which provide further empirical evidence for the utility of radiogenic Sr isotopes in sediment provenance studies. In a novel departure, however, we show that the 87Sr/86Sr difference between paired clay- and silt-size fractions (Δ87Sr/86Sr Clay-Silt) relates to the degree of chemical alteration of river sediments, as inferred from various relationships with weathering indices, such as the CIA, WIP and Na2O/Al2O3. The weathering dependence of Δ87Sr/86Sr Clay-Silt appears to be mainly controlled by temperature. In sub-Arctic and temperate regions, river sediments systematically display positive Δ87Sr/86Sr Clay-Silt indicative of preferential alteration of biotite in soils. In contrast, in sub-tropical watersheds characterized by mean annual temperatures >20 °C, intense feldspar weathering leads to the preferential incorporation of unradiogenic Sr into secondary clay minerals; a process which results in negative Δ87Sr/86Sr Clay-Silt values. In addition to climate forcing, the degree of size-dependent Sr isotope decoupling is also shown to be dependent on the type of weathering regime in watersheds, being more pronounced in low-elevation environments (< 2000 m), where transport-limited conditions and the presence of thick soil sequences can be associated with intense silicate weathering, than in ... |
author2 |
Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Bayon, Germain Freslon, Nicolas Yoann, Germain Bindeman, Ilya .N. Trinquier, Anne Barrat, Jean-Alix |
author_facet |
Bayon, Germain Freslon, Nicolas Yoann, Germain Bindeman, Ilya .N. Trinquier, Anne Barrat, Jean-Alix |
author_sort |
Bayon, Germain |
title |
A global survey of radiogenic strontium isotopes in river sediments |
title_short |
A global survey of radiogenic strontium isotopes in river sediments |
title_full |
A global survey of radiogenic strontium isotopes in river sediments |
title_fullStr |
A global survey of radiogenic strontium isotopes in river sediments |
title_full_unstemmed |
A global survey of radiogenic strontium isotopes in river sediments |
title_sort |
global survey of radiogenic strontium isotopes in river sediments |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal-insu.archives-ouvertes.fr/insu-03197632 https://hal-insu.archives-ouvertes.fr/insu-03197632/document https://hal-insu.archives-ouvertes.fr/insu-03197632/file/1-s2.0-S0009254120304976-main.pdf https://doi.org/10.1016/j.chemgeo.2020.119958 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
ISSN: 0009-2541 Chemical Geology https://hal-insu.archives-ouvertes.fr/insu-03197632 Chemical Geology, Elsevier, 2021, 559, pp.119958. ⟨10.1016/j.chemgeo.2020.119958⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.chemgeo.2020.119958 insu-03197632 https://hal-insu.archives-ouvertes.fr/insu-03197632 https://hal-insu.archives-ouvertes.fr/insu-03197632/document https://hal-insu.archives-ouvertes.fr/insu-03197632/file/1-s2.0-S0009254120304976-main.pdf doi:10.1016/j.chemgeo.2020.119958 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.chemgeo.2020.119958 |
container_title |
Chemical Geology |
container_volume |
559 |
container_start_page |
119958 |
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1766345465175998464 |