Image10_Spinel harzburgite–derived silicate melts forming sulfide-bearing orthopyroxenite in the lithosphere. Part 2: Sulfide compositions and their chalcophile and highly siderophile trace element signatures.JPEG
In the first article, we have reported petrological data for a new, glass-bearing orthopyroxenite vein cutting a sub-arc mantle xenolith from Kamchatka. As similar veins from the West Bismarck arc, this orthopyroxenite is sulfide-rich and formed by cooling of parental melts derived by partial meltin...
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ftfrontimediafig:oai:figshare.com:article/21533424 2023-05-15T16:59:15+02:00 Image10_Spinel harzburgite–derived silicate melts forming sulfide-bearing orthopyroxenite in the lithosphere. Part 2: Sulfide compositions and their chalcophile and highly siderophile trace element signatures.JPEG A. Bénard 2022-11-10T11:13:12Z https://doi.org/10.3389/feart.2022.868011.s002 https://figshare.com/articles/figure/Image10_Spinel_harzburgite_derived_silicate_melts_forming_sulfide-bearing_orthopyroxenite_in_the_lithosphere_Part_2_Sulfide_compositions_and_their_chalcophile_and_highly_siderophile_trace_element_signatures_JPEG/21533424 unknown doi:10.3389/feart.2022.868011.s002 https://figshare.com/articles/figure/Image10_Spinel_harzburgite_derived_silicate_melts_forming_sulfide-bearing_orthopyroxenite_in_the_lithosphere_Part_2_Sulfide_compositions_and_their_chalcophile_and_highly_siderophile_trace_element_signatures_JPEG/21533424 CC BY 4.0 CC-BY Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change sub-arc mantle low-Ca boninite harzburgite partial melting sulfide base metal chalcophile trace element highly siderophile trace element Image Figure 2022 ftfrontimediafig https://doi.org/10.3389/feart.2022.868011.s002 2022-11-17T00:11:12Z In the first article, we have reported petrological data for a new, glass-bearing orthopyroxenite vein cutting a sub-arc mantle xenolith from Kamchatka. As similar veins from the West Bismarck arc, this orthopyroxenite is sulfide-rich and formed by cooling of parental melts derived by partial melting of spinel harzburgite sources. Here, I report new data for the abundances of major base metals and chalcophile and highly siderophile trace elements in vein sulfides from the two localities. Kamchatka vein sulfides are all Cu-poor monosulfide solid solution (MSS). West Bismarck veins contain MSS and a ternary (Fe, Cu, Ni)S solid solution (“xSS”), which ranges between MSS and intermediate solid solution (ISS) in composition. Sulfides follow Ni and Cu enrichment trends and have chondrite-normalized platinum-group element (PGE) patterns with elevated Pt relative to Os, Ir, Ru, and Rh. Pt alloys are frequently associated with sulfides and vugs formed from hydrothermal fluids, which also contain metallic Fe and wüstite. Vein sulfides, ranging from Fe-rich MSS (ca. 1,050–1,100°C) to xSS (≤850°C) through Ni-rich MSS, were formed in a sulfide liquid line of descent under oxygen and sulfur fugacity conditions (fO 2 and fS 2 ) down to one log unit below the fayalite–magnetite–quartz and close to the Pt-PtS buffers, respectively. The Ni and Cu enrichment trends in MSS are consistent with cooling and fractionation of Ni-rich and Cu-poor sulfide liquids (original atomic ∑metal/S∼0.9), which will finally solidify as xSS or ISS. Chondrite-normalized Pt/Pd>1 in some of the sulfides is a signature of spinel harzburgite sources. Because it occurs at relatively low fS 2 , the crystallization sequence of these sulfide liquids is accompanied by the formation of abundant PGE alloys and other metallic phases. Melts derived from spinel harzburgite sources can be originally oxidized to carry up to ∼2,600 ppm S (predominantly as S 6+ ) and follow a sulfide-undersaturated evolution trend, until they are rapidly cooled to crystallize as ... Still Image Kamchatka Frontiers: Figshare Bismarck ENVELOPE(-64.000,-64.000,-64.833,-64.833) |
institution |
Open Polar |
collection |
Frontiers: Figshare |
op_collection_id |
ftfrontimediafig |
language |
unknown |
topic |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change sub-arc mantle low-Ca boninite harzburgite partial melting sulfide base metal chalcophile trace element highly siderophile trace element |
spellingShingle |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change sub-arc mantle low-Ca boninite harzburgite partial melting sulfide base metal chalcophile trace element highly siderophile trace element A. Bénard Image10_Spinel harzburgite–derived silicate melts forming sulfide-bearing orthopyroxenite in the lithosphere. Part 2: Sulfide compositions and their chalcophile and highly siderophile trace element signatures.JPEG |
topic_facet |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change sub-arc mantle low-Ca boninite harzburgite partial melting sulfide base metal chalcophile trace element highly siderophile trace element |
description |
In the first article, we have reported petrological data for a new, glass-bearing orthopyroxenite vein cutting a sub-arc mantle xenolith from Kamchatka. As similar veins from the West Bismarck arc, this orthopyroxenite is sulfide-rich and formed by cooling of parental melts derived by partial melting of spinel harzburgite sources. Here, I report new data for the abundances of major base metals and chalcophile and highly siderophile trace elements in vein sulfides from the two localities. Kamchatka vein sulfides are all Cu-poor monosulfide solid solution (MSS). West Bismarck veins contain MSS and a ternary (Fe, Cu, Ni)S solid solution (“xSS”), which ranges between MSS and intermediate solid solution (ISS) in composition. Sulfides follow Ni and Cu enrichment trends and have chondrite-normalized platinum-group element (PGE) patterns with elevated Pt relative to Os, Ir, Ru, and Rh. Pt alloys are frequently associated with sulfides and vugs formed from hydrothermal fluids, which also contain metallic Fe and wüstite. Vein sulfides, ranging from Fe-rich MSS (ca. 1,050–1,100°C) to xSS (≤850°C) through Ni-rich MSS, were formed in a sulfide liquid line of descent under oxygen and sulfur fugacity conditions (fO 2 and fS 2 ) down to one log unit below the fayalite–magnetite–quartz and close to the Pt-PtS buffers, respectively. The Ni and Cu enrichment trends in MSS are consistent with cooling and fractionation of Ni-rich and Cu-poor sulfide liquids (original atomic ∑metal/S∼0.9), which will finally solidify as xSS or ISS. Chondrite-normalized Pt/Pd>1 in some of the sulfides is a signature of spinel harzburgite sources. Because it occurs at relatively low fS 2 , the crystallization sequence of these sulfide liquids is accompanied by the formation of abundant PGE alloys and other metallic phases. Melts derived from spinel harzburgite sources can be originally oxidized to carry up to ∼2,600 ppm S (predominantly as S 6+ ) and follow a sulfide-undersaturated evolution trend, until they are rapidly cooled to crystallize as ... |
format |
Still Image |
author |
A. Bénard |
author_facet |
A. Bénard |
author_sort |
A. Bénard |
title |
Image10_Spinel harzburgite–derived silicate melts forming sulfide-bearing orthopyroxenite in the lithosphere. Part 2: Sulfide compositions and their chalcophile and highly siderophile trace element signatures.JPEG |
title_short |
Image10_Spinel harzburgite–derived silicate melts forming sulfide-bearing orthopyroxenite in the lithosphere. Part 2: Sulfide compositions and their chalcophile and highly siderophile trace element signatures.JPEG |
title_full |
Image10_Spinel harzburgite–derived silicate melts forming sulfide-bearing orthopyroxenite in the lithosphere. Part 2: Sulfide compositions and their chalcophile and highly siderophile trace element signatures.JPEG |
title_fullStr |
Image10_Spinel harzburgite–derived silicate melts forming sulfide-bearing orthopyroxenite in the lithosphere. Part 2: Sulfide compositions and their chalcophile and highly siderophile trace element signatures.JPEG |
title_full_unstemmed |
Image10_Spinel harzburgite–derived silicate melts forming sulfide-bearing orthopyroxenite in the lithosphere. Part 2: Sulfide compositions and their chalcophile and highly siderophile trace element signatures.JPEG |
title_sort |
image10_spinel harzburgite–derived silicate melts forming sulfide-bearing orthopyroxenite in the lithosphere. part 2: sulfide compositions and their chalcophile and highly siderophile trace element signatures.jpeg |
publishDate |
2022 |
url |
https://doi.org/10.3389/feart.2022.868011.s002 https://figshare.com/articles/figure/Image10_Spinel_harzburgite_derived_silicate_melts_forming_sulfide-bearing_orthopyroxenite_in_the_lithosphere_Part_2_Sulfide_compositions_and_their_chalcophile_and_highly_siderophile_trace_element_signatures_JPEG/21533424 |
long_lat |
ENVELOPE(-64.000,-64.000,-64.833,-64.833) |
geographic |
Bismarck |
geographic_facet |
Bismarck |
genre |
Kamchatka |
genre_facet |
Kamchatka |
op_relation |
doi:10.3389/feart.2022.868011.s002 https://figshare.com/articles/figure/Image10_Spinel_harzburgite_derived_silicate_melts_forming_sulfide-bearing_orthopyroxenite_in_the_lithosphere_Part_2_Sulfide_compositions_and_their_chalcophile_and_highly_siderophile_trace_element_signatures_JPEG/21533424 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/feart.2022.868011.s002 |
_version_ |
1766051473871863808 |