Image11_Spinel Harzburgite-Derived Silicate Melts Forming Sulfide-Bearing Orthopyroxenite in the Lithosphere. Part 1: Partition Coefficients and Volatile Evolution Accompanying Fluid- and Redox-Induced Sulfide Formation.JPEG
We report abundances of major trace and volatile elements in an orthopyroxenite vein cutting a sub-arc, mantle-derived, spinel harzburgite xenolith from Kamchatka. The orthopyroxenite contains abundant sulfides and is characterized by the presence of glass (formerly melt) both interstitially and as...
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Online Access: | https://doi.org/10.3389/feart.2022.867979.s003 https://figshare.com/articles/figure/Image11_Spinel_Harzburgite-Derived_Silicate_Melts_Forming_Sulfide-Bearing_Orthopyroxenite_in_the_Lithosphere_Part_1_Partition_Coefficients_and_Volatile_Evolution_Accompanying_Fluid-_and_Redox-Induced_Sulfide_Formation_JPEG/20289444 |
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ftfrontimediafig:oai:figshare.com:article/20289444 2023-05-15T16:59:15+02:00 Image11_Spinel Harzburgite-Derived Silicate Melts Forming Sulfide-Bearing Orthopyroxenite in the Lithosphere. Part 1: Partition Coefficients and Volatile Evolution Accompanying Fluid- and Redox-Induced Sulfide Formation.JPEG A. Bénard C. Le Losq O. Müntener M. Robyr O. Nebel R. J. Arculus D. A. Ionov 2022-07-12T04:22:05Z https://doi.org/10.3389/feart.2022.867979.s003 https://figshare.com/articles/figure/Image11_Spinel_Harzburgite-Derived_Silicate_Melts_Forming_Sulfide-Bearing_Orthopyroxenite_in_the_Lithosphere_Part_1_Partition_Coefficients_and_Volatile_Evolution_Accompanying_Fluid-_and_Redox-Induced_Sulfide_Formation_JPEG/20289444 unknown doi:10.3389/feart.2022.867979.s003 https://figshare.com/articles/figure/Image11_Spinel_Harzburgite-Derived_Silicate_Melts_Forming_Sulfide-Bearing_Orthopyroxenite_in_the_Lithosphere_Part_1_Partition_Coefficients_and_Volatile_Evolution_Accompanying_Fluid-_and_Redox-Induced_Sulfide_Formation_JPEG/20289444 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 volatile halogen sulfur pyroxenite Image Figure 2022 ftfrontimediafig https://doi.org/10.3389/feart.2022.867979.s003 2022-07-13T23:05:48Z We report abundances of major trace and volatile elements in an orthopyroxenite vein cutting a sub-arc, mantle-derived, spinel harzburgite xenolith from Kamchatka. The orthopyroxenite contains abundant sulfides and is characterized by the presence of glass (formerly melt) both interstitially and as inclusions in minerals, comparable with similar veins from the West Bismarck arc. The glass formed by quenching of residual melts following crystallization of abundant orthopyroxene, amphibole, and minor olivine and spinel. The interstitial glass has a low-Ti, high-Mg# andesite composition, with a wide range of H 2 O and S contents but more limited F and Cl variations. We calculate trace element partition coefficients using mineral and glass data, including those for halogens in amphibole, which agree with experimental results from the literature. Despite having a similar, high-Mg# andesite composition, the orthopyroxene-hosted glass inclusions usually contain much more H 2 O and S than the interstitial glass (4–7 wt% and ∼2,600 ppm, respectively). The initial vein-forming melts were oxidized, recording oxygen fugacity conditions up to ∼1.5 log units above the fayalite–magnetite–quartz oxygen buffer. They intruded the sub-arc mantle lithosphere at ≥1,300°C, where they partially crystallized to form high-Mg# andesitic derivative melts at ca. 1,050–1,100°C. Comparison with literature data on glass-free orthopyroxenite veins from Kamchatka and the glass-bearing ones from West Bismarck reveals fundamental similarities indicating common parental melts, which were originally produced by low-degree melting (≤5%) of spinel harzburgite at ≥1,360°C and ≤1.5 GPa. This harzburgite source likely contained ≤0.05 wt% H 2 O and a few ppm of halogens. Volatile evolution inferred from glass compositions shows that (i) redox exchange between S 6+ in the original melt and Fe 2+ in the host mantle minerals, together with (ii) the formation of an S-bearing, (H 2 O, Cl)-rich hydrothermal fluid from the original melt, provides the conditions ... 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 volatile halogen sulfur pyroxenite |
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 volatile halogen sulfur pyroxenite A. Bénard C. Le Losq O. Müntener M. Robyr O. Nebel R. J. Arculus D. A. Ionov Image11_Spinel Harzburgite-Derived Silicate Melts Forming Sulfide-Bearing Orthopyroxenite in the Lithosphere. Part 1: Partition Coefficients and Volatile Evolution Accompanying Fluid- and Redox-Induced Sulfide Formation.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 volatile halogen sulfur pyroxenite |
description |
We report abundances of major trace and volatile elements in an orthopyroxenite vein cutting a sub-arc, mantle-derived, spinel harzburgite xenolith from Kamchatka. The orthopyroxenite contains abundant sulfides and is characterized by the presence of glass (formerly melt) both interstitially and as inclusions in minerals, comparable with similar veins from the West Bismarck arc. The glass formed by quenching of residual melts following crystallization of abundant orthopyroxene, amphibole, and minor olivine and spinel. The interstitial glass has a low-Ti, high-Mg# andesite composition, with a wide range of H 2 O and S contents but more limited F and Cl variations. We calculate trace element partition coefficients using mineral and glass data, including those for halogens in amphibole, which agree with experimental results from the literature. Despite having a similar, high-Mg# andesite composition, the orthopyroxene-hosted glass inclusions usually contain much more H 2 O and S than the interstitial glass (4–7 wt% and ∼2,600 ppm, respectively). The initial vein-forming melts were oxidized, recording oxygen fugacity conditions up to ∼1.5 log units above the fayalite–magnetite–quartz oxygen buffer. They intruded the sub-arc mantle lithosphere at ≥1,300°C, where they partially crystallized to form high-Mg# andesitic derivative melts at ca. 1,050–1,100°C. Comparison with literature data on glass-free orthopyroxenite veins from Kamchatka and the glass-bearing ones from West Bismarck reveals fundamental similarities indicating common parental melts, which were originally produced by low-degree melting (≤5%) of spinel harzburgite at ≥1,360°C and ≤1.5 GPa. This harzburgite source likely contained ≤0.05 wt% H 2 O and a few ppm of halogens. Volatile evolution inferred from glass compositions shows that (i) redox exchange between S 6+ in the original melt and Fe 2+ in the host mantle minerals, together with (ii) the formation of an S-bearing, (H 2 O, Cl)-rich hydrothermal fluid from the original melt, provides the conditions ... |
format |
Still Image |
author |
A. Bénard C. Le Losq O. Müntener M. Robyr O. Nebel R. J. Arculus D. A. Ionov |
author_facet |
A. Bénard C. Le Losq O. Müntener M. Robyr O. Nebel R. J. Arculus D. A. Ionov |
author_sort |
A. Bénard |
title |
Image11_Spinel Harzburgite-Derived Silicate Melts Forming Sulfide-Bearing Orthopyroxenite in the Lithosphere. Part 1: Partition Coefficients and Volatile Evolution Accompanying Fluid- and Redox-Induced Sulfide Formation.JPEG |
title_short |
Image11_Spinel Harzburgite-Derived Silicate Melts Forming Sulfide-Bearing Orthopyroxenite in the Lithosphere. Part 1: Partition Coefficients and Volatile Evolution Accompanying Fluid- and Redox-Induced Sulfide Formation.JPEG |
title_full |
Image11_Spinel Harzburgite-Derived Silicate Melts Forming Sulfide-Bearing Orthopyroxenite in the Lithosphere. Part 1: Partition Coefficients and Volatile Evolution Accompanying Fluid- and Redox-Induced Sulfide Formation.JPEG |
title_fullStr |
Image11_Spinel Harzburgite-Derived Silicate Melts Forming Sulfide-Bearing Orthopyroxenite in the Lithosphere. Part 1: Partition Coefficients and Volatile Evolution Accompanying Fluid- and Redox-Induced Sulfide Formation.JPEG |
title_full_unstemmed |
Image11_Spinel Harzburgite-Derived Silicate Melts Forming Sulfide-Bearing Orthopyroxenite in the Lithosphere. Part 1: Partition Coefficients and Volatile Evolution Accompanying Fluid- and Redox-Induced Sulfide Formation.JPEG |
title_sort |
image11_spinel harzburgite-derived silicate melts forming sulfide-bearing orthopyroxenite in the lithosphere. part 1: partition coefficients and volatile evolution accompanying fluid- and redox-induced sulfide formation.jpeg |
publishDate |
2022 |
url |
https://doi.org/10.3389/feart.2022.867979.s003 https://figshare.com/articles/figure/Image11_Spinel_Harzburgite-Derived_Silicate_Melts_Forming_Sulfide-Bearing_Orthopyroxenite_in_the_Lithosphere_Part_1_Partition_Coefficients_and_Volatile_Evolution_Accompanying_Fluid-_and_Redox-Induced_Sulfide_Formation_JPEG/20289444 |
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.2022.867979.s003 https://figshare.com/articles/figure/Image11_Spinel_Harzburgite-Derived_Silicate_Melts_Forming_Sulfide-Bearing_Orthopyroxenite_in_the_Lithosphere_Part_1_Partition_Coefficients_and_Volatile_Evolution_Accompanying_Fluid-_and_Redox-Induced_Sulfide_Formation_JPEG/20289444 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/feart.2022.867979.s003 |
_version_ |
1766051470148370432 |