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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Published in:Lithosphere
Main Authors: Anton Kutyrev, Vadim S. Kamenetsky, Alkiviadis Kontonikas-Charos, Dmitry P. Savelyev, Tamara Yu. Yakich, Ivan A. Belousov, Elena I. Sandimirova, Svetlana V. Moskaleva
Format: Article in Journal/Newspaper
Language:English
Published: GeoScienceWorld 2023
Subjects:
Online Access:https://doi.org/10.2113/2023/lithosphere_2023_126
https://doaj.org/article/43988466a29f4f42ba128e11985f53c0
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spelling 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
institution Open Polar
collection Directory of Open Access Journals: DOAJ Articles
op_collection_id ftdoajarticles
language English
topic Geology
QE1-996.5
spellingShingle 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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