Effective global mixing of the highly siderophile elements into Earth’s mantle inferred from oceanic abyssal peridotites
Late accretion occurred through addition of massive impactors to Earth, leading to potential heterogeneity in the distribution of highly siderophile elements (HSE: Os, Ir, Ru, Pt, Pd, Re) within the mantle. Abyssal peridotites sample the presentday convecting mantle, which make them useful for exami...
Published in: | Geochimica et Cosmochimica Acta |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2021
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Online Access: | https://hal.science/hal-04092171 https://hal.science/hal-04092171/document https://hal.science/hal-04092171/file/Paquet-et-al_GCA_2022.pdf https://doi.org/10.1016/j.gca.2021.09.033 |
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ftccsdartic:oai:HAL:hal-04092171v1 2024-02-11T09:56:37+01:00 Effective global mixing of the highly siderophile elements into Earth’s mantle inferred from oceanic abyssal peridotites Paquet, Marine Day, James M.D. Brown, Diana, B Waters, Christopher, L Scripps Institution of Oceanography (SIO - UC San Diego) University of California San Diego (UC San Diego) University of California (UC)-University of California (UC) Institut de Physique du Globe de Paris (IPG Paris) 2021-10-05 https://hal.science/hal-04092171 https://hal.science/hal-04092171/document https://hal.science/hal-04092171/file/Paquet-et-al_GCA_2022.pdf https://doi.org/10.1016/j.gca.2021.09.033 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gca.2021.09.033 hal-04092171 https://hal.science/hal-04092171 https://hal.science/hal-04092171/document https://hal.science/hal-04092171/file/Paquet-et-al_GCA_2022.pdf doi:10.1016/j.gca.2021.09.033 http://creativecommons.org/licenses/by-nc-nd/ info:eu-repo/semantics/OpenAccess ISSN: 0016-7037 EISSN: 0016-7037 Geochimica et Cosmochimica Acta https://hal.science/hal-04092171 Geochimica et Cosmochimica Acta, 2021, 316, pp.347 - 362. ⟨10.1016/j.gca.2021.09.033⟩ Oceanic mantle Peridotite Highly siderophile elements Os isotopes Late accretion Mantle convection Heterogeneity Oceanic mantle peridotite highly siderophile elements Os isotopes late accretion mantle convection heterogeneity [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry info:eu-repo/semantics/article Journal articles 2021 ftccsdartic https://doi.org/10.1016/j.gca.2021.09.033 2024-01-13T23:57:50Z Late accretion occurred through addition of massive impactors to Earth, leading to potential heterogeneity in the distribution of highly siderophile elements (HSE: Os, Ir, Ru, Pt, Pd, Re) within the mantle. Abyssal peridotites sample the presentday convecting mantle, which make them useful for examining the distribution of the HSE within the mantle. Here we report new HSE abundance data and 187 Os/ 188 Os ratios, in conjunction with mineral chemistry and bulk rock major-and traceelement compositions for abyssal peridotites from the fast-spreading Pacific Antarctic Ridge (PAR) and East Pacific Rise (Hess Deep), and for slow to intermediate spreading ridges from the Southwest Indian Ridge, Central Indian Ridge and Mid-Atlantic Ridge. These analyses expand the global abyssal peridotite Os isotope and HSE database, enabling evaluation of potential variations with spreading rate, from ultraslow (<20 mm/yr, full spreading rate) to fast (135-150 mm/yr). Accounting for likely effects from seawater modification and serpentinization, the Pacific data reveals heterogeneous and sometimes significant melt depletion for PAR (3-23% melt depletion; 187 Os/ 188 Os from 0.1189 to 0.1336, average = 0.1267 ± 0.0065; 2SD) and Hess Deep abyssal peridotites (15-20% melt depletion; 0.1247 ± 0.0027). Abyssal peridotites from fast to intermediate spreading ridges reveal no systematic differences in the distribution and behavior of the HSE or Os isotopes, or in degrees of melt depletion, compared with slow to ultraslow spreading ridges. These observations arise despite significant differences in melt generation processes at mid-ocean ridges, suggesting that the effects of ancient melt depletion are more profound on HSE compositions in abyssal peridotites than modern melting beneath ridges. Using global abyssal peridotites with Al 2 O 3 content > 2 wt.%, the average composition of the primitive mantle is 0.3 ppb Re, 4.9 ppb Pd, 7.1 ppb Pt, 7.2 ppb Ru, 3.8 ppb Ir and Os, showing no Pd/Ir, but a positive Ru/Ir anomaly, relative to ... Article in Journal/Newspaper Antarc* Antarctic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic Hess ENVELOPE(-65.133,-65.133,-67.200,-67.200) Indian Mid-Atlantic Ridge Pacific Geochimica et Cosmochimica Acta 316 347 362 |
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 |
Oceanic mantle Peridotite Highly siderophile elements Os isotopes Late accretion Mantle convection Heterogeneity Oceanic mantle peridotite highly siderophile elements Os isotopes late accretion mantle convection heterogeneity [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
spellingShingle |
Oceanic mantle Peridotite Highly siderophile elements Os isotopes Late accretion Mantle convection Heterogeneity Oceanic mantle peridotite highly siderophile elements Os isotopes late accretion mantle convection heterogeneity [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry Paquet, Marine Day, James M.D. Brown, Diana, B Waters, Christopher, L Effective global mixing of the highly siderophile elements into Earth’s mantle inferred from oceanic abyssal peridotites |
topic_facet |
Oceanic mantle Peridotite Highly siderophile elements Os isotopes Late accretion Mantle convection Heterogeneity Oceanic mantle peridotite highly siderophile elements Os isotopes late accretion mantle convection heterogeneity [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
description |
Late accretion occurred through addition of massive impactors to Earth, leading to potential heterogeneity in the distribution of highly siderophile elements (HSE: Os, Ir, Ru, Pt, Pd, Re) within the mantle. Abyssal peridotites sample the presentday convecting mantle, which make them useful for examining the distribution of the HSE within the mantle. Here we report new HSE abundance data and 187 Os/ 188 Os ratios, in conjunction with mineral chemistry and bulk rock major-and traceelement compositions for abyssal peridotites from the fast-spreading Pacific Antarctic Ridge (PAR) and East Pacific Rise (Hess Deep), and for slow to intermediate spreading ridges from the Southwest Indian Ridge, Central Indian Ridge and Mid-Atlantic Ridge. These analyses expand the global abyssal peridotite Os isotope and HSE database, enabling evaluation of potential variations with spreading rate, from ultraslow (<20 mm/yr, full spreading rate) to fast (135-150 mm/yr). Accounting for likely effects from seawater modification and serpentinization, the Pacific data reveals heterogeneous and sometimes significant melt depletion for PAR (3-23% melt depletion; 187 Os/ 188 Os from 0.1189 to 0.1336, average = 0.1267 ± 0.0065; 2SD) and Hess Deep abyssal peridotites (15-20% melt depletion; 0.1247 ± 0.0027). Abyssal peridotites from fast to intermediate spreading ridges reveal no systematic differences in the distribution and behavior of the HSE or Os isotopes, or in degrees of melt depletion, compared with slow to ultraslow spreading ridges. These observations arise despite significant differences in melt generation processes at mid-ocean ridges, suggesting that the effects of ancient melt depletion are more profound on HSE compositions in abyssal peridotites than modern melting beneath ridges. Using global abyssal peridotites with Al 2 O 3 content > 2 wt.%, the average composition of the primitive mantle is 0.3 ppb Re, 4.9 ppb Pd, 7.1 ppb Pt, 7.2 ppb Ru, 3.8 ppb Ir and Os, showing no Pd/Ir, but a positive Ru/Ir anomaly, relative to ... |
author2 |
Scripps Institution of Oceanography (SIO - UC San Diego) University of California San Diego (UC San Diego) University of California (UC)-University of California (UC) Institut de Physique du Globe de Paris (IPG Paris) |
format |
Article in Journal/Newspaper |
author |
Paquet, Marine Day, James M.D. Brown, Diana, B Waters, Christopher, L |
author_facet |
Paquet, Marine Day, James M.D. Brown, Diana, B Waters, Christopher, L |
author_sort |
Paquet, Marine |
title |
Effective global mixing of the highly siderophile elements into Earth’s mantle inferred from oceanic abyssal peridotites |
title_short |
Effective global mixing of the highly siderophile elements into Earth’s mantle inferred from oceanic abyssal peridotites |
title_full |
Effective global mixing of the highly siderophile elements into Earth’s mantle inferred from oceanic abyssal peridotites |
title_fullStr |
Effective global mixing of the highly siderophile elements into Earth’s mantle inferred from oceanic abyssal peridotites |
title_full_unstemmed |
Effective global mixing of the highly siderophile elements into Earth’s mantle inferred from oceanic abyssal peridotites |
title_sort |
effective global mixing of the highly siderophile elements into earth’s mantle inferred from oceanic abyssal peridotites |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.science/hal-04092171 https://hal.science/hal-04092171/document https://hal.science/hal-04092171/file/Paquet-et-al_GCA_2022.pdf https://doi.org/10.1016/j.gca.2021.09.033 |
long_lat |
ENVELOPE(-65.133,-65.133,-67.200,-67.200) |
geographic |
Antarctic Hess Indian Mid-Atlantic Ridge Pacific |
geographic_facet |
Antarctic Hess Indian Mid-Atlantic Ridge Pacific |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
ISSN: 0016-7037 EISSN: 0016-7037 Geochimica et Cosmochimica Acta https://hal.science/hal-04092171 Geochimica et Cosmochimica Acta, 2021, 316, pp.347 - 362. ⟨10.1016/j.gca.2021.09.033⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gca.2021.09.033 hal-04092171 https://hal.science/hal-04092171 https://hal.science/hal-04092171/document https://hal.science/hal-04092171/file/Paquet-et-al_GCA_2022.pdf doi:10.1016/j.gca.2021.09.033 |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.gca.2021.09.033 |
container_title |
Geochimica et Cosmochimica Acta |
container_volume |
316 |
container_start_page |
347 |
op_container_end_page |
362 |
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1790604545237188608 |