Silicate-sulfide liquid immiscibility in modern arc basalt (Tolbachik volcano, Kamchatka): Part I. Occurrence and compositions of sulfide melts
Silicate-sulfide liquid immiscibility plays a key role in the formation of magmatic sulfide ore deposits but incipient sulfide melts are rarely preserved in natural rocks. This study presents the distribution and compositions of olivine-hosted sulfide melt globules resulting from silicate-sulfide li...
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ftanucanberra:oai:openresearch-repository.anu.edu.au:1885/139071 2024-01-14T10:08:16+01:00 Silicate-sulfide liquid immiscibility in modern arc basalt (Tolbachik volcano, Kamchatka): Part I. Occurrence and compositions of sulfide melts Zelenski, M. Kamenetsky, V. S. Mavrogenes, John Gurenko, A. A. Danyushevsky, L. V. application/pdf http://hdl.handle.net/1885/139071 https://doi.org/10.1016/j.chemgeo.2017.09.013 https://openresearch-repository.anu.edu.au/bitstream/1885/139071/4/1-s2.0-S0009254117305144-main.pdf.jpg unknown Elsevier 0009-2541 http://hdl.handle.net/1885/139071 doi:10.1016/j.chemgeo.2017.09.013 https://openresearch-repository.anu.edu.au/bitstream/1885/139071/4/1-s2.0-S0009254117305144-main.pdf.jpg © 2017 Elsevier B.V. Chemical Geology Sulfide Immiscibility Olivine Melt inclusions Chalcophile metals Island-arc magma Tolbachik volcano Journal article ftanucanberra https://doi.org/10.1016/j.chemgeo.2017.09.013 2023-12-15T09:34:03Z Silicate-sulfide liquid immiscibility plays a key role in the formation of magmatic sulfide ore deposits but incipient sulfide melts are rarely preserved in natural rocks. This study presents the distribution and compositions of olivine-hosted sulfide melt globules resulting from silicate-sulfide liquid immiscibility in primitive arc basalts. Abundant sulfide droplets entrapped in olivine from primitive basalts of the 1941 eruption and pre-historic eruptive cone “Mt. 1004” of the Tolbachik volcano, Kurile-Kamchatka arc. Inclusions range from submicron to 250 μm in size, coexist with sulfur-rich glass (≤ 1.1 wt% S), and, in some cases, with magmatic anhydrite. Saturation in sulfide occurred early in the evolution of a water- and sulfur-rich magma, moderately oxidized (QFM + 1 to +1.5), which crystallized high-Mg olivine (Fo₈₆ˍ₉₂), clinopyroxene and Cr-spinel. The process developed dense “clouds” of sulfide in relatively small volumes of magma, with highly variable abundances of chalcophile metals. The low degree of sulfide supersaturation promoted diffusive equilibration of the growing droplets with the melt in Ni and Cu, resulting in high concentrations (≈ 38 mol%) of CuS and NiS in the earliest sulfide liquids. The Tolbachik samples provide a glimpse into deep arc processes not seen elsewhere, and may show how arc magmas, despite their oxidized nature, saturate in sulfide. This study was supported by the Russian Science Foundation grant # 16-17-10145. This is CRPG contribution #2534 Article in Journal/Newspaper Kamchatka Australian National University: ANU Digital Collections Tolbachik ENVELOPE(159.960,159.960,55.537,55.537) Chemical Geology 478 102 111 |
institution |
Open Polar |
collection |
Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
unknown |
topic |
Sulfide Immiscibility Olivine Melt inclusions Chalcophile metals Island-arc magma Tolbachik volcano |
spellingShingle |
Sulfide Immiscibility Olivine Melt inclusions Chalcophile metals Island-arc magma Tolbachik volcano Zelenski, M. Kamenetsky, V. S. Mavrogenes, John Gurenko, A. A. Danyushevsky, L. V. Silicate-sulfide liquid immiscibility in modern arc basalt (Tolbachik volcano, Kamchatka): Part I. Occurrence and compositions of sulfide melts |
topic_facet |
Sulfide Immiscibility Olivine Melt inclusions Chalcophile metals Island-arc magma Tolbachik volcano |
description |
Silicate-sulfide liquid immiscibility plays a key role in the formation of magmatic sulfide ore deposits but incipient sulfide melts are rarely preserved in natural rocks. This study presents the distribution and compositions of olivine-hosted sulfide melt globules resulting from silicate-sulfide liquid immiscibility in primitive arc basalts. Abundant sulfide droplets entrapped in olivine from primitive basalts of the 1941 eruption and pre-historic eruptive cone “Mt. 1004” of the Tolbachik volcano, Kurile-Kamchatka arc. Inclusions range from submicron to 250 μm in size, coexist with sulfur-rich glass (≤ 1.1 wt% S), and, in some cases, with magmatic anhydrite. Saturation in sulfide occurred early in the evolution of a water- and sulfur-rich magma, moderately oxidized (QFM + 1 to +1.5), which crystallized high-Mg olivine (Fo₈₆ˍ₉₂), clinopyroxene and Cr-spinel. The process developed dense “clouds” of sulfide in relatively small volumes of magma, with highly variable abundances of chalcophile metals. The low degree of sulfide supersaturation promoted diffusive equilibration of the growing droplets with the melt in Ni and Cu, resulting in high concentrations (≈ 38 mol%) of CuS and NiS in the earliest sulfide liquids. The Tolbachik samples provide a glimpse into deep arc processes not seen elsewhere, and may show how arc magmas, despite their oxidized nature, saturate in sulfide. This study was supported by the Russian Science Foundation grant # 16-17-10145. This is CRPG contribution #2534 |
format |
Article in Journal/Newspaper |
author |
Zelenski, M. Kamenetsky, V. S. Mavrogenes, John Gurenko, A. A. Danyushevsky, L. V. |
author_facet |
Zelenski, M. Kamenetsky, V. S. Mavrogenes, John Gurenko, A. A. Danyushevsky, L. V. |
author_sort |
Zelenski, M. |
title |
Silicate-sulfide liquid immiscibility in modern arc basalt (Tolbachik volcano, Kamchatka): Part I. Occurrence and compositions of sulfide melts |
title_short |
Silicate-sulfide liquid immiscibility in modern arc basalt (Tolbachik volcano, Kamchatka): Part I. Occurrence and compositions of sulfide melts |
title_full |
Silicate-sulfide liquid immiscibility in modern arc basalt (Tolbachik volcano, Kamchatka): Part I. Occurrence and compositions of sulfide melts |
title_fullStr |
Silicate-sulfide liquid immiscibility in modern arc basalt (Tolbachik volcano, Kamchatka): Part I. Occurrence and compositions of sulfide melts |
title_full_unstemmed |
Silicate-sulfide liquid immiscibility in modern arc basalt (Tolbachik volcano, Kamchatka): Part I. Occurrence and compositions of sulfide melts |
title_sort |
silicate-sulfide liquid immiscibility in modern arc basalt (tolbachik volcano, kamchatka): part i. occurrence and compositions of sulfide melts |
publisher |
Elsevier |
url |
http://hdl.handle.net/1885/139071 https://doi.org/10.1016/j.chemgeo.2017.09.013 https://openresearch-repository.anu.edu.au/bitstream/1885/139071/4/1-s2.0-S0009254117305144-main.pdf.jpg |
long_lat |
ENVELOPE(159.960,159.960,55.537,55.537) |
geographic |
Tolbachik |
geographic_facet |
Tolbachik |
genre |
Kamchatka |
genre_facet |
Kamchatka |
op_source |
Chemical Geology |
op_relation |
0009-2541 http://hdl.handle.net/1885/139071 doi:10.1016/j.chemgeo.2017.09.013 https://openresearch-repository.anu.edu.au/bitstream/1885/139071/4/1-s2.0-S0009254117305144-main.pdf.jpg |
op_rights |
© 2017 Elsevier B.V. |
op_doi |
https://doi.org/10.1016/j.chemgeo.2017.09.013 |
container_title |
Chemical Geology |
container_volume |
478 |
container_start_page |
102 |
op_container_end_page |
111 |
_version_ |
1788062694093357056 |