Hydrothermal Chromitites from the Oman Ophiolite: The Role of Water in Chromitite Genesis

The role of water-rich solutions in the formation of chromitites has been the matter of controversy. We found small chromite concentrations (chromitites) in diopsidites, precipitated from high-temperature hydrothermal fluids, in the mantle to the crust of the Oman ophiolite. Here, we present petrolo...
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Autor*in:	Shoji Arai [verfasserIn] Makoto Miura [verfasserIn] Akihiro Tamura [verfasserIn] Norikatsu Akizawa [verfasserIn] Akira Ishikawa [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2020

Schlagwörter:	hydrothermal chromitites ca-al silicates seawater oman ophiolite slab-derived fluids platinum-group elements

Übergeordnetes Werk:	In: Minerals - MDPI AG, 2012, 10(2020), 3, p 217
Übergeordnetes Werk:	volume:10 ; year:2020 ; number:3, p 217

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3390/min10030217

Katalog-ID:	DOAJ006203868

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authorswithroles_txt_mv	Shoji Arai @@aut@@ Makoto Miura @@aut@@ Akihiro Tamura @@aut@@ Norikatsu Akizawa @@aut@@ Akira Ishikawa @@aut@@
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callnumber-first	Q - Science
author	Shoji Arai
spellingShingle	Shoji Arai misc QE351-399.2 misc hydrothermal chromitites misc ca-al silicates misc seawater misc oman ophiolite misc slab-derived fluids misc platinum-group elements misc Mineralogy Hydrothermal Chromitites from the Oman Ophiolite: The Role of Water in Chromitite Genesis
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topic_title	QE351-399.2 Hydrothermal Chromitites from the Oman Ophiolite: The Role of Water in Chromitite Genesis hydrothermal chromitites ca-al silicates seawater oman ophiolite slab-derived fluids platinum-group elements
topic	misc QE351-399.2 misc hydrothermal chromitites misc ca-al silicates misc seawater misc oman ophiolite misc slab-derived fluids misc platinum-group elements misc Mineralogy
topic_unstemmed	misc QE351-399.2 misc hydrothermal chromitites misc ca-al silicates misc seawater misc oman ophiolite misc slab-derived fluids misc platinum-group elements misc Mineralogy
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title	Hydrothermal Chromitites from the Oman Ophiolite: The Role of Water in Chromitite Genesis
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title_full	Hydrothermal Chromitites from the Oman Ophiolite: The Role of Water in Chromitite Genesis
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title_sort	hydrothermal chromitites from the oman ophiolite: the role of water in chromitite genesis
callnumber	QE351-399.2
title_auth	Hydrothermal Chromitites from the Oman Ophiolite: The Role of Water in Chromitite Genesis
abstract	The role of water-rich solutions in the formation of chromitites has been the matter of controversy. We found small chromite concentrations (chromitites) in diopsidites, precipitated from high-temperature hydrothermal fluids, in the mantle to the crust of the Oman ophiolite. Here, we present petrologic characteristics of the hydrothermal chromitites to understand their genesis. In the chromitites, the chromite is associated with uvarovite in the crust and diopside + grossular in the mantle. They are discriminated from the magmatic podiform chromitite by dominance of the Ca-Al silicates in the matrix. The fluids responsible for chromite precipitation are possibly saline, being derived from the seawater circulated into the mantle through the crust. The saline fluids precipitate chromite to form chromite upon decompression and cooling, and transport platinum-group elements (especially Pt and Pd). The fluids obtain Ca and Al from the crustal rocks and Cr from the mantle rocks during circulation. Saline fluids are also supplied from the slab to the mantle wedge, and can metasomatically precipitate chromite and pyroxenes within peridotites. They re-distribute Cr and chromite in peridotites along with circulation of saline fluids in the mantle wedge.
abstractGer	The role of water-rich solutions in the formation of chromitites has been the matter of controversy. We found small chromite concentrations (chromitites) in diopsidites, precipitated from high-temperature hydrothermal fluids, in the mantle to the crust of the Oman ophiolite. Here, we present petrologic characteristics of the hydrothermal chromitites to understand their genesis. In the chromitites, the chromite is associated with uvarovite in the crust and diopside + grossular in the mantle. They are discriminated from the magmatic podiform chromitite by dominance of the Ca-Al silicates in the matrix. The fluids responsible for chromite precipitation are possibly saline, being derived from the seawater circulated into the mantle through the crust. The saline fluids precipitate chromite to form chromite upon decompression and cooling, and transport platinum-group elements (especially Pt and Pd). The fluids obtain Ca and Al from the crustal rocks and Cr from the mantle rocks during circulation. Saline fluids are also supplied from the slab to the mantle wedge, and can metasomatically precipitate chromite and pyroxenes within peridotites. They re-distribute Cr and chromite in peridotites along with circulation of saline fluids in the mantle wedge.
abstract_unstemmed	The role of water-rich solutions in the formation of chromitites has been the matter of controversy. We found small chromite concentrations (chromitites) in diopsidites, precipitated from high-temperature hydrothermal fluids, in the mantle to the crust of the Oman ophiolite. Here, we present petrologic characteristics of the hydrothermal chromitites to understand their genesis. In the chromitites, the chromite is associated with uvarovite in the crust and diopside + grossular in the mantle. They are discriminated from the magmatic podiform chromitite by dominance of the Ca-Al silicates in the matrix. The fluids responsible for chromite precipitation are possibly saline, being derived from the seawater circulated into the mantle through the crust. The saline fluids precipitate chromite to form chromite upon decompression and cooling, and transport platinum-group elements (especially Pt and Pd). The fluids obtain Ca and Al from the crustal rocks and Cr from the mantle rocks during circulation. Saline fluids are also supplied from the slab to the mantle wedge, and can metasomatically precipitate chromite and pyroxenes within peridotites. They re-distribute Cr and chromite in peridotites along with circulation of saline fluids in the mantle wedge.
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title_short	Hydrothermal Chromitites from the Oman Ophiolite: The Role of Water in Chromitite Genesis
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up_date	2024-07-03T19:34:57.662Z
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Hydrothermal Chromitites from the Oman Ophiolite: The Role of Water in Chromitite Genesis

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