中国东秦岭造山带大石沟碳酸盐岩型 Mo-REE-U 矿床的燕山期铀成矿时代及其地质意义

IF 2.2 4区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Minerals Pub Date : 2024-09-11 DOI:10.3390/min14090928

Guangwen Huang, Dehai Wu, Furong Li, Chunrong Pan, Pengfei Fan, Zhuang Min

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引用次数: 0

摘要

大石沟矿床是中国东秦岭成矿带最具代表性的碳酸盐岩型 Mo-REE 矿床之一，钼资源量超过 180 kt，稀土资源量达 37.8 kt。近期勘探发现，该矿床内铀矿化规模相当大。因此，本研究对大石沟矿床的铀矿化进行了详细的矿物学和 EPMA U-Th-Pb 化学年代测定。结果表明，大西沟矿床的铀矿体主要由碳酸盐岩脉组成，主要为正方体网状铀矿石。矿物组合的特征是铀矿石+金红石+姥铁矿+橄榄石或勃朗宁石。铀矿石的地球化学成分为高 Y 和 Ce，低 Si、Ti 和 Mg。EPMA U-Th-Pb 化学年代测定结果为 144 ± 3.1 Ma，代表了该地区的燕山期铀矿化时代。新发现的铀矿化年龄表明，该矿床在白垩纪经历了一次铀再动员事件，并在碰撞造山运动后的大陆内造山运动和延伸环境中形成。

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The Yanshanian Uranium Mineralization Age and Its Geological Significance in the Dashigou Carbonatite-Type Mo-REE-U Deposit, East Qinling Orogen, China

The Dashigou deposit is one of the most representative carbonatite-type Mo-REE deposits in the East Qinling metallogenic belt of China, with a molybdenum resource of more than 180 kt and a rare earth resource of 37.8 kt. Recent exploration has revealed a considerable scale of uranium mineralization within this deposit. Therefore, this study conducted detailed mineralogical and EPMA U-Th-Pb chemical dating on the uranium mineralization in the Dashigou deposit. The results indicate that the U-ore body in the Dashigou deposit mainly consists in carbonatite veins, and principally as anhedral, mesh-like uraninite. The mineral assemblage is characterized by uraninite + rutile + bastnasite + parisite or brannerite. The uraninite displays geochemical compositions of high Y and Ce and low Si, Ti, and Mg. The EPMA U-Th-Pb chemical dating is 144 ± 3.1 Ma, representing the Yanshanian uranium mineralization age in the region. The newly discovered uranium mineralization age indicates that the deposit experienced a uranium remobilization event during the Cretaceous and was formed in an intracontinental orogenic and extensional environment post-collision orogeny.

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来源期刊

Minerals MINERALOGY-MINING & MINERAL PROCESSING

CiteScore

4.10

自引率

20.00%

发文量

1351

审稿时长

19.04 days

期刊介绍： Minerals (ISSN 2075-163X) is an international open access journal that covers the broad field of mineralogy, economic mineral resources, mineral exploration, innovative mining techniques and advances in mineral processing. It publishes reviews, regular research papers and short notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.