Composition, crystallization conditions and genesis of sulfide-saturated parental melts of olivine-phyric rocks from Kamchatsky Mys (Kamchatka, Russia)
Sulfide liquids that immiscibly separate from silicate melts in different magmatic processes accumulate chalcophile metals and may represent important sources of the metals in Earth's crust for the formation of ore deposits. Sulfide phases commonly found in some primitive mid-ocean ridge basalt...
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ftunivtasmania:oai:eprints.utas.edu.au:37514 2023-05-15T16:59:02+02:00 Composition, crystallization conditions and genesis of sulfide-saturated parental melts of olivine-phyric rocks from Kamchatsky Mys (Kamchatka, Russia) Korneeva, AA Nekrylov, N Kamenetsky, VS Portnyagin, MV Savelyev, DP Krasheninnikov, SP Abersteiner, A Kamenetsky, MB Zelenski, ME Shcherbakov, VD Botcharnikov, RE 2020 https://eprints.utas.edu.au/37514/ unknown Elsevier Science Bv Korneeva, AA, Nekrylov, N, Kamenetsky, VS orcid:0000-0002-2734-8790 , Portnyagin, MV, Savelyev, DP, Krasheninnikov, SP, Abersteiner, A, Kamenetsky, MB orcid:0000-0002-0417-3975 , Zelenski, ME, Shcherbakov, VD and Botcharnikov, RE 2020 , 'Composition, crystallization conditions and genesis of sulfide-saturated parental melts of olivine-phyric rocks from Kamchatsky Mys (Kamchatka, Russia)' , Lithos, vol. 370-37 , pp. 1-14 , doi:10.1016/j.lithos.2020.105657 <http://dx.doi.org/10.1016/j.lithos.2020.105657>. melt inclusions sulfide immiscibility temperature Article PeerReviewed 2020 ftunivtasmania https://doi.org/10.1016/j.lithos.2020.105657 2021-09-27T22:16:37Z Sulfide liquids that immiscibly separate from silicate melts in different magmatic processes accumulate chalcophile metals and may represent important sources of the metals in Earth's crust for the formation of ore deposits. Sulfide phases commonly found in some primitive mid-ocean ridge basalts (MORB) may support the occurrence of sulfide immiscibility in the crust without requiring magma contamination and/or extensive fractionation. However, the records of incipient sulfide melts in equilibrium with primitive high-Mg olivine and Cr-spinel are scarce. Sulfide globules in olivine phenocrysts in picritic rocks of MORB-affinity at Kamchatsky Mys (Eastern Kamchatka, Russia) represent a well-documented example of natural immiscibility in primitive oceanic magmas. Our study examines the conditions of silicate-sulfide immiscibility in these magmas by reporting high precision data on the compositions of Cr-spinel and silicate melt inclusions, hosted in Mg-rich olivine (86.9-90 mol% Fo), which also contain globules of magmatic sulfide melt. Major and trace element contents of reconstructed parental silicate melts, redox conditions (ΔQFM = +0.1 ± 0.16 (1σ) log. units) and crystallization temperature (1200-1285 °C), as well as mantle potential temperatures (∼1350 °C), correspond to typical MORB values. We show that nearly 50% of sulfur could be captured in daughter sulfide globules even in reheated melt inclusions, which could lead to a significant underestimation of sulfur content in reconstructed silicate melts. The saturation of these melts in sulfur appears to be unrelated to the effects of melt crystallization and crustal assimilation, so we discuss the reasons for the S variations in reconstructed melts and the influence of pressure and other parameters on the SCSS (Sulfur Content at Sulfide Saturation). Article in Journal/Newspaper Kamchatka University of Tasmania: UTas ePrints Lithos 370-371 105657 |
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Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
unknown |
topic |
melt inclusions sulfide immiscibility temperature |
spellingShingle |
melt inclusions sulfide immiscibility temperature Korneeva, AA Nekrylov, N Kamenetsky, VS Portnyagin, MV Savelyev, DP Krasheninnikov, SP Abersteiner, A Kamenetsky, MB Zelenski, ME Shcherbakov, VD Botcharnikov, RE Composition, crystallization conditions and genesis of sulfide-saturated parental melts of olivine-phyric rocks from Kamchatsky Mys (Kamchatka, Russia) |
topic_facet |
melt inclusions sulfide immiscibility temperature |
description |
Sulfide liquids that immiscibly separate from silicate melts in different magmatic processes accumulate chalcophile metals and may represent important sources of the metals in Earth's crust for the formation of ore deposits. Sulfide phases commonly found in some primitive mid-ocean ridge basalts (MORB) may support the occurrence of sulfide immiscibility in the crust without requiring magma contamination and/or extensive fractionation. However, the records of incipient sulfide melts in equilibrium with primitive high-Mg olivine and Cr-spinel are scarce. Sulfide globules in olivine phenocrysts in picritic rocks of MORB-affinity at Kamchatsky Mys (Eastern Kamchatka, Russia) represent a well-documented example of natural immiscibility in primitive oceanic magmas. Our study examines the conditions of silicate-sulfide immiscibility in these magmas by reporting high precision data on the compositions of Cr-spinel and silicate melt inclusions, hosted in Mg-rich olivine (86.9-90 mol% Fo), which also contain globules of magmatic sulfide melt. Major and trace element contents of reconstructed parental silicate melts, redox conditions (ΔQFM = +0.1 ± 0.16 (1σ) log. units) and crystallization temperature (1200-1285 °C), as well as mantle potential temperatures (∼1350 °C), correspond to typical MORB values. We show that nearly 50% of sulfur could be captured in daughter sulfide globules even in reheated melt inclusions, which could lead to a significant underestimation of sulfur content in reconstructed silicate melts. The saturation of these melts in sulfur appears to be unrelated to the effects of melt crystallization and crustal assimilation, so we discuss the reasons for the S variations in reconstructed melts and the influence of pressure and other parameters on the SCSS (Sulfur Content at Sulfide Saturation). |
format |
Article in Journal/Newspaper |
author |
Korneeva, AA Nekrylov, N Kamenetsky, VS Portnyagin, MV Savelyev, DP Krasheninnikov, SP Abersteiner, A Kamenetsky, MB Zelenski, ME Shcherbakov, VD Botcharnikov, RE |
author_facet |
Korneeva, AA Nekrylov, N Kamenetsky, VS Portnyagin, MV Savelyev, DP Krasheninnikov, SP Abersteiner, A Kamenetsky, MB Zelenski, ME Shcherbakov, VD Botcharnikov, RE |
author_sort |
Korneeva, AA |
title |
Composition, crystallization conditions and genesis of sulfide-saturated parental melts of olivine-phyric rocks from Kamchatsky Mys (Kamchatka, Russia) |
title_short |
Composition, crystallization conditions and genesis of sulfide-saturated parental melts of olivine-phyric rocks from Kamchatsky Mys (Kamchatka, Russia) |
title_full |
Composition, crystallization conditions and genesis of sulfide-saturated parental melts of olivine-phyric rocks from Kamchatsky Mys (Kamchatka, Russia) |
title_fullStr |
Composition, crystallization conditions and genesis of sulfide-saturated parental melts of olivine-phyric rocks from Kamchatsky Mys (Kamchatka, Russia) |
title_full_unstemmed |
Composition, crystallization conditions and genesis of sulfide-saturated parental melts of olivine-phyric rocks from Kamchatsky Mys (Kamchatka, Russia) |
title_sort |
composition, crystallization conditions and genesis of sulfide-saturated parental melts of olivine-phyric rocks from kamchatsky mys (kamchatka, russia) |
publisher |
Elsevier Science Bv |
publishDate |
2020 |
url |
https://eprints.utas.edu.au/37514/ |
genre |
Kamchatka |
genre_facet |
Kamchatka |
op_relation |
Korneeva, AA, Nekrylov, N, Kamenetsky, VS orcid:0000-0002-2734-8790 , Portnyagin, MV, Savelyev, DP, Krasheninnikov, SP, Abersteiner, A, Kamenetsky, MB orcid:0000-0002-0417-3975 , Zelenski, ME, Shcherbakov, VD and Botcharnikov, RE 2020 , 'Composition, crystallization conditions and genesis of sulfide-saturated parental melts of olivine-phyric rocks from Kamchatsky Mys (Kamchatka, Russia)' , Lithos, vol. 370-37 , pp. 1-14 , doi:10.1016/j.lithos.2020.105657 <http://dx.doi.org/10.1016/j.lithos.2020.105657>. |
op_doi |
https://doi.org/10.1016/j.lithos.2020.105657 |
container_title |
Lithos |
container_volume |
370-371 |
container_start_page |
105657 |
_version_ |
1766051208778219520 |