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Silicate-sulfide liquid immiscibility in modern arc basalt (Tolbachik volcano, Kamchatka): Part I. Occurrence and compositions of sulfide melts
Citation
Zelenski, M and Kamenetsky, VS and Mavrogenes, JA and Gurenko, AA and Danyushevsky, LV, Silicate-sulfide liquid immiscibility in modern arc basalt (Tolbachik volcano, Kamchatka): Part I. Occurrence and compositions of sulfide melts, Chemical Geology, 478 pp. 102-111. ISSN 0009-2541 (2018) [Refereed Article]
Copyright Statement
Copyright 2017 Elsevier B.V.
DOI: doi:10.1016/j.chemgeo.2017.09.013
Abstract
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 (Fo86–92), 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.
Item Details
Item Type: | Refereed Article |
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Keywords: | sulfide, immiscibility, chalcophile metals, island-arc magma, Tolbachik volcano |
Research Division: | Earth Sciences |
Research Group: | Geology |
Research Field: | Igneous and metamorphic petrology |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the earth sciences |
UTAS Author: | Kamenetsky, VS (Professor Vadim Kamenetsky) |
UTAS Author: | Danyushevsky, LV (Professor Leonid Danyushevsky) |
ID Code: | 122303 |
Year Published: | 2018 |
Web of Science® Times Cited: | 16 |
Deposited By: | CODES ARC |
Deposited On: | 2017-11-08 |
Last Modified: | 2019-03-12 |
Downloads: | 0 |
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