Testing Trace-Element Distribution and the Zr-Based Thermometry of Accessory Rutile from Chromitite

Trace element distribution and Zr-in-rutile temperature have been investigated in accessory rutile from stratiform (UG2, Merensky Reef, Jacurici), podiform (Loma Peguera), and metamorphic chromitites in cratonic shields (Cedrolina, Nuasahi). Rutile from chromitite has typical finger-print of Cr-V-Nb...
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Gespeichert in:

Autor*in:	Federica Zaccarini [verfasserIn] Giorgio Garuti [verfasserIn] George L. Luvizotto [verfasserIn] Yuri de Melo Portella [verfasserIn] Athokpam K. Singh [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2021

Schlagwörter:	rutile trace elements Zr-in-rutile thermometry chromite deposits magmatic crystallization metamorphism

Übergeordnetes Werk:	In: Minerals - MDPI AG, 2012, 11(2021), 7, p 661
Übergeordnetes Werk:	volume:11 ; year:2021 ; number:7, p 661

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3390/min11070661

Katalog-ID:	DOAJ058172270

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callnumber-first	Q - Science
author	Federica Zaccarini
spellingShingle	Federica Zaccarini misc QE351-399.2 misc rutile misc trace elements misc Zr-in-rutile thermometry misc chromite deposits misc magmatic crystallization misc metamorphism misc Mineralogy Testing Trace-Element Distribution and the Zr-Based Thermometry of Accessory Rutile from Chromitite
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topic_title	QE351-399.2 Testing Trace-Element Distribution and the Zr-Based Thermometry of Accessory Rutile from Chromitite rutile trace elements Zr-in-rutile thermometry chromite deposits magmatic crystallization metamorphism
topic	misc QE351-399.2 misc rutile misc trace elements misc Zr-in-rutile thermometry misc chromite deposits misc magmatic crystallization misc metamorphism misc Mineralogy
topic_unstemmed	misc QE351-399.2 misc rutile misc trace elements misc Zr-in-rutile thermometry misc chromite deposits misc magmatic crystallization misc metamorphism misc Mineralogy
topic_browse	misc QE351-399.2 misc rutile misc trace elements misc Zr-in-rutile thermometry misc chromite deposits misc magmatic crystallization misc metamorphism misc Mineralogy
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title	Testing Trace-Element Distribution and the Zr-Based Thermometry of Accessory Rutile from Chromitite
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title_full	Testing Trace-Element Distribution and the Zr-Based Thermometry of Accessory Rutile from Chromitite
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author_browse	Federica Zaccarini Giorgio Garuti George L. Luvizotto Yuri de Melo Portella Athokpam K. Singh
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title_sort	testing trace-element distribution and the zr-based thermometry of accessory rutile from chromitite
callnumber	QE351-399.2
title_auth	Testing Trace-Element Distribution and the Zr-Based Thermometry of Accessory Rutile from Chromitite
abstract	Trace element distribution and Zr-in-rutile temperature have been investigated in accessory rutile from stratiform (UG2, Merensky Reef, Jacurici), podiform (Loma Peguera), and metamorphic chromitites in cratonic shields (Cedrolina, Nuasahi). Rutile from chromitite has typical finger-print of Cr-V-Nb-W-Zr, whose relative abundance distinguishes magmatic from metamorphic chromitite. In magmatic deposits, rutile precipitates as an intercumulus phase, or forms by exsolution from chromite, between 870 °C and 540 °C. The Cr-V in rutile reflects the composition of chromite, both Nb and Zr are moderately enriched, and W is depleted, except for in Jacurici, where moderate W excess was a result of crustal contamination of the mafic magma. In metamorphic deposits, rutile forms by removal of Ti-Cr-V from chromite during metamorphism between 650 °C and 400 °C, consistent with greenschist-amphibolite facies, and displays variable Cr-Nb, low V-Zr, and anomalous enrichment in W caused by reaction with felsic fluids emanating from granitoid intrusions. All deposits, except Cedrolina, contain Rutile+PGM composite grains (<10 µm) locked in chromite, possibly representing relics of orthomagmatic assemblages. The high Cr-V content and the distinctive W-Nb-Zr signature that typifies accessory rutile in chromitite provide a new pathfinder to trace the provenance of detrital rutile in placer deposits.
abstractGer	Trace element distribution and Zr-in-rutile temperature have been investigated in accessory rutile from stratiform (UG2, Merensky Reef, Jacurici), podiform (Loma Peguera), and metamorphic chromitites in cratonic shields (Cedrolina, Nuasahi). Rutile from chromitite has typical finger-print of Cr-V-Nb-W-Zr, whose relative abundance distinguishes magmatic from metamorphic chromitite. In magmatic deposits, rutile precipitates as an intercumulus phase, or forms by exsolution from chromite, between 870 °C and 540 °C. The Cr-V in rutile reflects the composition of chromite, both Nb and Zr are moderately enriched, and W is depleted, except for in Jacurici, where moderate W excess was a result of crustal contamination of the mafic magma. In metamorphic deposits, rutile forms by removal of Ti-Cr-V from chromite during metamorphism between 650 °C and 400 °C, consistent with greenschist-amphibolite facies, and displays variable Cr-Nb, low V-Zr, and anomalous enrichment in W caused by reaction with felsic fluids emanating from granitoid intrusions. All deposits, except Cedrolina, contain Rutile+PGM composite grains (<10 µm) locked in chromite, possibly representing relics of orthomagmatic assemblages. The high Cr-V content and the distinctive W-Nb-Zr signature that typifies accessory rutile in chromitite provide a new pathfinder to trace the provenance of detrital rutile in placer deposits.
abstract_unstemmed	Trace element distribution and Zr-in-rutile temperature have been investigated in accessory rutile from stratiform (UG2, Merensky Reef, Jacurici), podiform (Loma Peguera), and metamorphic chromitites in cratonic shields (Cedrolina, Nuasahi). Rutile from chromitite has typical finger-print of Cr-V-Nb-W-Zr, whose relative abundance distinguishes magmatic from metamorphic chromitite. In magmatic deposits, rutile precipitates as an intercumulus phase, or forms by exsolution from chromite, between 870 °C and 540 °C. The Cr-V in rutile reflects the composition of chromite, both Nb and Zr are moderately enriched, and W is depleted, except for in Jacurici, where moderate W excess was a result of crustal contamination of the mafic magma. In metamorphic deposits, rutile forms by removal of Ti-Cr-V from chromite during metamorphism between 650 °C and 400 °C, consistent with greenschist-amphibolite facies, and displays variable Cr-Nb, low V-Zr, and anomalous enrichment in W caused by reaction with felsic fluids emanating from granitoid intrusions. All deposits, except Cedrolina, contain Rutile+PGM composite grains (<10 µm) locked in chromite, possibly representing relics of orthomagmatic assemblages. The high Cr-V content and the distinctive W-Nb-Zr signature that typifies accessory rutile in chromitite provide a new pathfinder to trace the provenance of detrital rutile in placer deposits.
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container_issue	7, p 661
title_short	Testing Trace-Element Distribution and the Zr-Based Thermometry of Accessory Rutile from Chromitite
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up_date	2024-07-03T16:25:39.795Z
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Rutile from chromitite has typical finger-print of Cr-V-Nb-W-Zr, whose relative abundance distinguishes magmatic from metamorphic chromitite. In magmatic deposits, rutile precipitates as an intercumulus phase, or forms by exsolution from chromite, between 870 °C and 540 °C. The Cr-V in rutile reflects the composition of chromite, both Nb and Zr are moderately enriched, and W is depleted, except for in Jacurici, where moderate W excess was a result of crustal contamination of the mafic magma. In metamorphic deposits, rutile forms by removal of Ti-Cr-V from chromite during metamorphism between 650 °C and 400 °C, consistent with greenschist-amphibolite facies, and displays variable Cr-Nb, low V-Zr, and anomalous enrichment in W caused by reaction with felsic fluids emanating from granitoid intrusions. All deposits, except Cedrolina, contain Rutile+PGM composite grains (<10 µm) locked in chromite, possibly representing relics of orthomagmatic assemblages. 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Testing Trace-Element Distribution and the Zr-Based Thermometry of Accessory Rutile from Chromitite

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