Heavy rare earth element (HREE) enrichment in carbonatites: A case study from a xenotime-bearing carbonatite REE deposit in Bachu, Xinjiang of China

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F41601670%3A_____%2F20%3AN0000034" target="_blank" >RIV/41601670:_____/20:N0000034 - isvavai.cz</a>

Výsledek na webu

<a href="https://goldschmidtabstracts.info/abstracts/abstractView?doi=10.46427/gold2020.2436" target="_blank" >https://goldschmidtabstracts.info/abstracts/abstractView?doi=10.46427/gold2020.2436</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Heavy rare earth element (HREE) enrichment in carbonatites: A case study from a xenotime-bearing carbonatite REE deposit in Bachu, Xinjiang of China

Popis výsledku v původním jazyce

The Bachu carbonatite is located in the northwestern Tarim Large Igneous Province, Xinjiang, China, and hosts economic REE resources. The rocks occur as dike swarms covering ca. 5 km2. The carbonatitic magma evolved from dolomite- to a calcite-dominated composition and with subsequent hydrothermal REE mineralization. During this process, the HREE/LREE ratios of the whole-rock and corresponding carbonates and apatites have remarkably increased, and large amounts of xenotimes occurred in the later calcite carbonatites. Note that the fluorite was not observed in all the samples investigated, and the xenotimes are closely associated with the sulfates (e.g., Barite and celestite). Also, the C-O-Sr-Nd isotopic data suggest a mantle-derived magmatic-hydrothermal system without any contributions from the crust. Therefore, we suggest that the different LREE/HREE compatibility of the calcite and dolomite (HREE are much compatible in calcite) during the carbonatitic magmatic stage and the indistinguishable LREE/HREE migration capabilities of the sulfate-complexes, as well as a fluorine-depleted source, control the HREE enrichment in carbonatites. Sulfate-rich but F-poor mineralogy may be a potential indicator for the presence of HREE mineralization in carbonatites.

Název v anglickém jazyce

Heavy rare earth element (HREE) enrichment in carbonatites: A case study from a xenotime-bearing carbonatite REE deposit in Bachu, Xinjiang of China

Popis výsledku anglicky

The Bachu carbonatite is located in the northwestern Tarim Large Igneous Province, Xinjiang, China, and hosts economic REE resources. The rocks occur as dike swarms covering ca. 5 km2. The carbonatitic magma evolved from dolomite- to a calcite-dominated composition and with subsequent hydrothermal REE mineralization. During this process, the HREE/LREE ratios of the whole-rock and corresponding carbonates and apatites have remarkably increased, and large amounts of xenotimes occurred in the later calcite carbonatites. Note that the fluorite was not observed in all the samples investigated, and the xenotimes are closely associated with the sulfates (e.g., Barite and celestite). Also, the C-O-Sr-Nd isotopic data suggest a mantle-derived magmatic-hydrothermal system without any contributions from the crust. Therefore, we suggest that the different LREE/HREE compatibility of the calcite and dolomite (HREE are much compatible in calcite) during the carbonatitic magmatic stage and the indistinguishable LREE/HREE migration capabilities of the sulfate-complexes, as well as a fluorine-depleted source, control the HREE enrichment in carbonatites. Sulfate-rich but F-poor mineralogy may be a potential indicator for the presence of HREE mineralization in carbonatites.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

10505 - Geology

Projekt

<a href="/cs/project/GX19-29124X" target="_blank" >GX19-29124X: VÝVOJ STAVEB A GEOCHEMICKÉ SIGNATURY KARBONATITŮ V ČASE: VÝZNAM MOBILITY A KONCENTRACE KRITICKÝCH KOVŮ</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů