Under-studied carbonatites and REE deposits: The Example of Mongolia

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F41601670%3A_____%2F20%3AN0000035" target="_blank" >RIV/41601670:_____/20:N0000035 - isvavai.cz</a>

Výsledek na webu

<a href="http://goldschmidtabstracts.info/abstracts/abstractView?doi=10.46427/gold2020.1393" target="_blank" >http://goldschmidtabstracts.info/abstracts/abstractView?doi=10.46427/gold2020.1393</a>

DOI - Digital Object Identifier

—

Jazyk výsledku

angličtina

Název v původním jazyce

Under-studied carbonatites and REE deposits: The Example of Mongolia

Popis výsledku v původním jazyce

Carbonatites are rare igneous rocks, critically important because of their associated rare-metal mineralization.Although carbonatites have been the subject of scientific research and scrutiny for almost a century, many aspectsof their origin and evolution, as well as their exploration remain under-studied, controversial or even a hithertounrecognized. The exact causes and mechanisms responsible for the uniquely high levels of REE in carbonatitesrelative to any other igneous rock remain debated. Particularly a few carbonatites in Mongolia are not only moreenriched in REE than igneous rocks but are exclusively composed of primary REE carbonates and Ca-REEfluorocarbonates and belong to the most REE enriched carbonatites in the world. To investigate these mechanisms,a suite of REE-bearing carbonatites from Mongolia (Lugiin Gol and Omnot Olgii) was re-examined. These rocks wererepeatedly a subject to series of later (tectonic) processes affecting in different degree original textures, mineralogyand the distribution of REE and other rare metals in the parental rock and their amenability to economic recovery.However, these rocks still contain primary Ba-Sr-REE carbonate burbankite (euhedral hexagonal crystals up to 2 cm ×3 cm in size, either fresh or pseudomorphed by an assemblage of plethora late-stage fluorocarbonates). Thesecarbonatites are typified by locally extremely high LREE, Sr and Ba contents and depletion in Nb, Ta, Zr, Hf and Ti.These geochemical characteristics are typical of carbonatites emplaced in orogenic settings and derived frommantle sources modified by subduction. However, further isotopic studies are required to constrain the nature of thissource and elucidate the relations between the two rock types.

Název v anglickém jazyce

Under-studied carbonatites and REE deposits: The Example of Mongolia

Popis výsledku anglicky

Carbonatites are rare igneous rocks, critically important because of their associated rare-metal mineralization.Although carbonatites have been the subject of scientific research and scrutiny for almost a century, many aspectsof their origin and evolution, as well as their exploration remain under-studied, controversial or even a hithertounrecognized. The exact causes and mechanisms responsible for the uniquely high levels of REE in carbonatitesrelative to any other igneous rock remain debated. Particularly a few carbonatites in Mongolia are not only moreenriched in REE than igneous rocks but are exclusively composed of primary REE carbonates and Ca-REEfluorocarbonates and belong to the most REE enriched carbonatites in the world. To investigate these mechanisms,a suite of REE-bearing carbonatites from Mongolia (Lugiin Gol and Omnot Olgii) was re-examined. These rocks wererepeatedly a subject to series of later (tectonic) processes affecting in different degree original textures, mineralogyand the distribution of REE and other rare metals in the parental rock and their amenability to economic recovery.However, these rocks still contain primary Ba-Sr-REE carbonate burbankite (euhedral hexagonal crystals up to 2 cm ×3 cm in size, either fresh or pseudomorphed by an assemblage of plethora late-stage fluorocarbonates). Thesecarbonatites are typified by locally extremely high LREE, Sr and Ba contents and depletion in Nb, Ta, Zr, Hf and Ti.These geochemical characteristics are typical of carbonatites emplaced in orogenic settings and derived frommantle sources modified by subduction. However, further isotopic studies are required to constrain the nature of thissource and elucidate the relations between the two rock types.

Druh

O - Ostatní výsledky

CEP obor

—

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