Behavior of Platinum-Group Elements during Hydrous Metamorphism: Constraints from Awaruite (Ni3Fe) Mineralization
Natural Fe-Ni alloys are common in meteorites and, presumably, the Earth’s core, where they host significant platinum-group elements (PGE). However, little is known on PGE concentrations in hydrothermal or metamorphic Fe-Ni alloys (i.e., awaruite Ni3Fe) from terrestrial rocks. In this work, we exami...
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ftdoajarticles:oai:doaj.org/article:43988466a29f4f42ba128e11985f53c0 2024-01-21T10:07:41+01:00 Behavior of Platinum-Group Elements during Hydrous Metamorphism: Constraints from Awaruite (Ni3Fe) Mineralization Anton Kutyrev Vadim S. Kamenetsky Alkiviadis Kontonikas-Charos Dmitry P. Savelyev Tamara Yu. Yakich Ivan A. Belousov Elena I. Sandimirova Svetlana V. Moskaleva 2023-10-01T00:00:00Z https://doi.org/10.2113/2023/lithosphere_2023_126 https://doaj.org/article/43988466a29f4f42ba128e11985f53c0 EN eng GeoScienceWorld https://pubs.geoscienceworld.org/gsa/lithosphere/article-pdf/doi/10.2113/2023/lithosphere_2023_126/5992654/lithosphere_2023_126.pdf https://doaj.org/toc/1941-8264 https://doaj.org/toc/1947-4253 1941-8264 1947-4253 doi:10.2113/2023/lithosphere_2023_126 https://doaj.org/article/43988466a29f4f42ba128e11985f53c0 Lithosphere, Vol 2023, Iss 1 (2023) Geology QE1-996.5 article 2023 ftdoajarticles https://doi.org/10.2113/2023/lithosphere_2023_126 2023-12-24T01:46:39Z Natural Fe-Ni alloys are common in meteorites and, presumably, the Earth’s core, where they host significant platinum-group elements (PGE). However, little is known on PGE concentrations in hydrothermal or metamorphic Fe-Ni alloys (i.e., awaruite Ni3Fe) from terrestrial rocks. In this work, we examine the geochemistry of awaruite and related minerals from several placer deposits sourced from the suprasubduction ophiolitic (Kamchatsky Mys, Karaginsky Island, and Mamet) and Ural-Alaskan (Galmoenan) complexes of Kamchatka and the Koryak Highlands (Far East Russia) in order to assess the abundance of PGE in awaruite and constrain their mobility under metamorphic and hydrothermal conditions. Studied awaruite from ophiolitic and Ural-Alaskan type complexes formed via desulfurization of pentlandite during serpentinization. Three groups of platinum-group minerals (PGMs) are associated with awaruite from Kamchatsky Mys: (1) Pt-Fe alloys such as ferronickelplatinum (Pt2FeNi) or unnamed Ni2FePt alloys; (2) Os-Ir-Ru alloys of various composition; (3) Pd-Sb minerals which form together with serpentine during hydrothermal alteration. Despite the abundance of PGM inclusions, no significant PGE concentrations were measured in awaruite from the Kamchatsky Mys, Karaginsky Island, or Mamet ophiolites. In contrast, pentlandite relicts in awaruite from placers related to the Galmoenan Ural-Alaskan type complex contain exceptionally high, previously unreported, Os (up to 540 ppm). Awaruite that forms on behalf of this pentlandite does not show any significant Os enrichment. Rare Galmoenan awaruite analyses yield up to 3 ppm Pd. The new data are not in complete accordance with previous studies that reported relatively high (up to first 10 ppm) PGE content in awaruite. We attribute this to low PGE concentration in precursor sulfides and preferential partitioning of PGE into discrete secondary PGM within awaruite. Nevertheless, abundant inclusions of secondary PGM in awaruite provide evidence of PGE mobility during metamorphic and ... Article in Journal/Newspaper Kamchatka Koryak Directory of Open Access Journals: DOAJ Articles Lithosphere 2023 1 |
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Geology QE1-996.5 |
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Geology QE1-996.5 Anton Kutyrev Vadim S. Kamenetsky Alkiviadis Kontonikas-Charos Dmitry P. Savelyev Tamara Yu. Yakich Ivan A. Belousov Elena I. Sandimirova Svetlana V. Moskaleva Behavior of Platinum-Group Elements during Hydrous Metamorphism: Constraints from Awaruite (Ni3Fe) Mineralization |
topic_facet |
Geology QE1-996.5 |
description |
Natural Fe-Ni alloys are common in meteorites and, presumably, the Earth’s core, where they host significant platinum-group elements (PGE). However, little is known on PGE concentrations in hydrothermal or metamorphic Fe-Ni alloys (i.e., awaruite Ni3Fe) from terrestrial rocks. In this work, we examine the geochemistry of awaruite and related minerals from several placer deposits sourced from the suprasubduction ophiolitic (Kamchatsky Mys, Karaginsky Island, and Mamet) and Ural-Alaskan (Galmoenan) complexes of Kamchatka and the Koryak Highlands (Far East Russia) in order to assess the abundance of PGE in awaruite and constrain their mobility under metamorphic and hydrothermal conditions. Studied awaruite from ophiolitic and Ural-Alaskan type complexes formed via desulfurization of pentlandite during serpentinization. Three groups of platinum-group minerals (PGMs) are associated with awaruite from Kamchatsky Mys: (1) Pt-Fe alloys such as ferronickelplatinum (Pt2FeNi) or unnamed Ni2FePt alloys; (2) Os-Ir-Ru alloys of various composition; (3) Pd-Sb minerals which form together with serpentine during hydrothermal alteration. Despite the abundance of PGM inclusions, no significant PGE concentrations were measured in awaruite from the Kamchatsky Mys, Karaginsky Island, or Mamet ophiolites. In contrast, pentlandite relicts in awaruite from placers related to the Galmoenan Ural-Alaskan type complex contain exceptionally high, previously unreported, Os (up to 540 ppm). Awaruite that forms on behalf of this pentlandite does not show any significant Os enrichment. Rare Galmoenan awaruite analyses yield up to 3 ppm Pd. The new data are not in complete accordance with previous studies that reported relatively high (up to first 10 ppm) PGE content in awaruite. We attribute this to low PGE concentration in precursor sulfides and preferential partitioning of PGE into discrete secondary PGM within awaruite. Nevertheless, abundant inclusions of secondary PGM in awaruite provide evidence of PGE mobility during metamorphic and ... |
format |
Article in Journal/Newspaper |
author |
Anton Kutyrev Vadim S. Kamenetsky Alkiviadis Kontonikas-Charos Dmitry P. Savelyev Tamara Yu. Yakich Ivan A. Belousov Elena I. Sandimirova Svetlana V. Moskaleva |
author_facet |
Anton Kutyrev Vadim S. Kamenetsky Alkiviadis Kontonikas-Charos Dmitry P. Savelyev Tamara Yu. Yakich Ivan A. Belousov Elena I. Sandimirova Svetlana V. Moskaleva |
author_sort |
Anton Kutyrev |
title |
Behavior of Platinum-Group Elements during Hydrous Metamorphism: Constraints from Awaruite (Ni3Fe) Mineralization |
title_short |
Behavior of Platinum-Group Elements during Hydrous Metamorphism: Constraints from Awaruite (Ni3Fe) Mineralization |
title_full |
Behavior of Platinum-Group Elements during Hydrous Metamorphism: Constraints from Awaruite (Ni3Fe) Mineralization |
title_fullStr |
Behavior of Platinum-Group Elements during Hydrous Metamorphism: Constraints from Awaruite (Ni3Fe) Mineralization |
title_full_unstemmed |
Behavior of Platinum-Group Elements during Hydrous Metamorphism: Constraints from Awaruite (Ni3Fe) Mineralization |
title_sort |
behavior of platinum-group elements during hydrous metamorphism: constraints from awaruite (ni3fe) mineralization |
publisher |
GeoScienceWorld |
publishDate |
2023 |
url |
https://doi.org/10.2113/2023/lithosphere_2023_126 https://doaj.org/article/43988466a29f4f42ba128e11985f53c0 |
genre |
Kamchatka Koryak |
genre_facet |
Kamchatka Koryak |
op_source |
Lithosphere, Vol 2023, Iss 1 (2023) |
op_relation |
https://pubs.geoscienceworld.org/gsa/lithosphere/article-pdf/doi/10.2113/2023/lithosphere_2023_126/5992654/lithosphere_2023_126.pdf https://doaj.org/toc/1941-8264 https://doaj.org/toc/1947-4253 1941-8264 1947-4253 doi:10.2113/2023/lithosphere_2023_126 https://doaj.org/article/43988466a29f4f42ba128e11985f53c0 |
op_doi |
https://doi.org/10.2113/2023/lithosphere_2023_126 |
container_title |
Lithosphere |
container_volume |
2023 |
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1 |
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1788698309016158208 |