The Mercury Isotopic Composition of Earth's Mantle and the Use of Mass Independently Fractionated Hg to Test for Recycled Crust
International audience The element mercury (Hg) can develop large mass-independent fractionation (MIF) (Δ 199 Hg) due to photo-chemical reactions at Earth's surface. This results in globally negative Δ 199 Hg for terrestrial sub-aerially-derived materials and positive Δ 199 Hg for sub-aqueously...
Published in: | Geophysical Research Letters |
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Online Access: | https://hal.archives-ouvertes.fr/hal-03321622 https://hal.archives-ouvertes.fr/hal-03321622/document https://hal.archives-ouvertes.fr/hal-03321622/file/MercuryGRL-HAL.pdf https://doi.org/10.1029/2021GL094301 |
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ftunivnantes:oai:HAL:hal-03321622v1 2023-05-15T16:52:00+02:00 The Mercury Isotopic Composition of Earth's Mantle and the Use of Mass Independently Fractionated Hg to Test for Recycled Crust Moynier, Frederic Jackson, Matthew, Zhang, Ke Cai, Hongming Halldórsson, Saemundur, Pik, Raphael Day, James, Chen, Jiubin Institut de Physique du Globe de Paris (IPGP (UMR_7154)) Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) 2021 https://hal.archives-ouvertes.fr/hal-03321622 https://hal.archives-ouvertes.fr/hal-03321622/document https://hal.archives-ouvertes.fr/hal-03321622/file/MercuryGRL-HAL.pdf https://doi.org/10.1029/2021GL094301 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2021GL094301 hal-03321622 https://hal.archives-ouvertes.fr/hal-03321622 https://hal.archives-ouvertes.fr/hal-03321622/document https://hal.archives-ouvertes.fr/hal-03321622/file/MercuryGRL-HAL.pdf doi:10.1029/2021GL094301 info:eu-repo/semantics/OpenAccess ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.archives-ouvertes.fr/hal-03321622 Geophysical Research Letters, In press, ⟨10.1029/2021GL094301⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2021 ftunivnantes https://doi.org/10.1029/2021GL094301 2022-12-07T00:56:15Z International audience The element mercury (Hg) can develop large mass-independent fractionation (MIF) (Δ 199 Hg) due to photo-chemical reactions at Earth's surface. This results in globally negative Δ 199 Hg for terrestrial sub-aerially-derived materials and positive Δ 199 Hg for sub-aqueously-derived marine sediments. The mantle composition least affected by crustal recycling is estimated from high-3 He/ 4 He lavas from Samoa and Iceland, providing an average of Δ 199 Hg=0.00±0.10, Δ 201 Hg=-0.02±0.0.09, δ 202 Hg=-1.7±1.2; 2SD, N=11. By comparison, a HIMU-type lava from Tubuai exhibits positive Δ 199 Hg, consistent with altered oceanic crust in its mantle source. A Samoan (EM2) lava has negative Δ 199 Hg reflecting incorporation of continental crust materials into its source. Three Pitcairn lavas exhibit positive Δ 199 Hg which correlate with 87 Sr/ 86 Sr, consistent with variable proportions of continental (low Δ 199 Hg and high 87 Sr/ 86 Sr) and oceanic (high Δ 199 Hg and low 87 Sr/ 86 Sr) crustal material in their mantle sources. These observations indicate that MIF signatures offer a powerful tool for examining atmosphere-deep Earth interactions. Plain language summary: While Earth's mantle is continuously chemically and isotopically stirred by convection, some ocean island lavas preserve isotopic anomalies. Their most likely origin is the recycling of crustal material into Earth's mantle by subduction. A question is then whether these crustal materials originate from the ocean or the continents. By using mercury stable isotopic compositions, which have specific signatures in ocean and continent materials, we identify whether these anomalies are due to continental or oceanic crustal material in various ocean island basalts. Article in Journal/Newspaper Iceland Ocean Island Université de Nantes: HAL-UNIV-NANTES Geophysical Research Letters 48 17 |
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Open Polar |
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Université de Nantes: HAL-UNIV-NANTES |
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ftunivnantes |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences Moynier, Frederic Jackson, Matthew, Zhang, Ke Cai, Hongming Halldórsson, Saemundur, Pik, Raphael Day, James, Chen, Jiubin The Mercury Isotopic Composition of Earth's Mantle and the Use of Mass Independently Fractionated Hg to Test for Recycled Crust |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The element mercury (Hg) can develop large mass-independent fractionation (MIF) (Δ 199 Hg) due to photo-chemical reactions at Earth's surface. This results in globally negative Δ 199 Hg for terrestrial sub-aerially-derived materials and positive Δ 199 Hg for sub-aqueously-derived marine sediments. The mantle composition least affected by crustal recycling is estimated from high-3 He/ 4 He lavas from Samoa and Iceland, providing an average of Δ 199 Hg=0.00±0.10, Δ 201 Hg=-0.02±0.0.09, δ 202 Hg=-1.7±1.2; 2SD, N=11. By comparison, a HIMU-type lava from Tubuai exhibits positive Δ 199 Hg, consistent with altered oceanic crust in its mantle source. A Samoan (EM2) lava has negative Δ 199 Hg reflecting incorporation of continental crust materials into its source. Three Pitcairn lavas exhibit positive Δ 199 Hg which correlate with 87 Sr/ 86 Sr, consistent with variable proportions of continental (low Δ 199 Hg and high 87 Sr/ 86 Sr) and oceanic (high Δ 199 Hg and low 87 Sr/ 86 Sr) crustal material in their mantle sources. These observations indicate that MIF signatures offer a powerful tool for examining atmosphere-deep Earth interactions. Plain language summary: While Earth's mantle is continuously chemically and isotopically stirred by convection, some ocean island lavas preserve isotopic anomalies. Their most likely origin is the recycling of crustal material into Earth's mantle by subduction. A question is then whether these crustal materials originate from the ocean or the continents. By using mercury stable isotopic compositions, which have specific signatures in ocean and continent materials, we identify whether these anomalies are due to continental or oceanic crustal material in various ocean island basalts. |
author2 |
Institut de Physique du Globe de Paris (IPGP (UMR_7154)) Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) |
format |
Article in Journal/Newspaper |
author |
Moynier, Frederic Jackson, Matthew, Zhang, Ke Cai, Hongming Halldórsson, Saemundur, Pik, Raphael Day, James, Chen, Jiubin |
author_facet |
Moynier, Frederic Jackson, Matthew, Zhang, Ke Cai, Hongming Halldórsson, Saemundur, Pik, Raphael Day, James, Chen, Jiubin |
author_sort |
Moynier, Frederic |
title |
The Mercury Isotopic Composition of Earth's Mantle and the Use of Mass Independently Fractionated Hg to Test for Recycled Crust |
title_short |
The Mercury Isotopic Composition of Earth's Mantle and the Use of Mass Independently Fractionated Hg to Test for Recycled Crust |
title_full |
The Mercury Isotopic Composition of Earth's Mantle and the Use of Mass Independently Fractionated Hg to Test for Recycled Crust |
title_fullStr |
The Mercury Isotopic Composition of Earth's Mantle and the Use of Mass Independently Fractionated Hg to Test for Recycled Crust |
title_full_unstemmed |
The Mercury Isotopic Composition of Earth's Mantle and the Use of Mass Independently Fractionated Hg to Test for Recycled Crust |
title_sort |
mercury isotopic composition of earth's mantle and the use of mass independently fractionated hg to test for recycled crust |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.archives-ouvertes.fr/hal-03321622 https://hal.archives-ouvertes.fr/hal-03321622/document https://hal.archives-ouvertes.fr/hal-03321622/file/MercuryGRL-HAL.pdf https://doi.org/10.1029/2021GL094301 |
genre |
Iceland Ocean Island |
genre_facet |
Iceland Ocean Island |
op_source |
ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.archives-ouvertes.fr/hal-03321622 Geophysical Research Letters, In press, ⟨10.1029/2021GL094301⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2021GL094301 hal-03321622 https://hal.archives-ouvertes.fr/hal-03321622 https://hal.archives-ouvertes.fr/hal-03321622/document https://hal.archives-ouvertes.fr/hal-03321622/file/MercuryGRL-HAL.pdf doi:10.1029/2021GL094301 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2021GL094301 |
container_title |
Geophysical Research Letters |
container_volume |
48 |
container_issue |
17 |
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1766042129250910208 |