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Timing of carbonatite-hosted u-polymetallic mineralization in the supergiant Huayangchuan deposit,Qinling Orogen:Constraints from titanite u-pb and molybdenite Re-Os dating

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Geoscience Frontiers 2020年第5期11卷 1581-1592页

作者： Hui Zheng Huayong Chen Dengfeng Li Chao Wu Xi Chen Chun-kit Lai Key Laboratory of Mineralogy and Metallogeny Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China university of Chinese Academy of Sciences Beijing 100049China School of Marine Sciences Sun Yat-sen UniversityGuangzhou 510006China School of Earth Science and Technology Southwest Petroleum UniversityChengdu 610000China Faculty of Science Universiti Brunei DarussalamGadongBE1410Brunei Darussalam

The newly-discovered supergiant Huayangchuan uranium(u)-polymetallic(Sr,Se,REEs,Ba,Nb and pb)deposit is located in the Qinling Orogen,central *** deposit underwent multistage mineralization,with the main carbonatite ore stage being the most important for the u,Nb,REE,Sr and Ba *** to the mineral assemblages,the main carbonatite ore stage can be divided into three substages,i.e.,sulfate(Ba-Sr),alkali-rich u and REE-u ***-stage titanite from the Huayangchuan igneous carbonatite are rich in high field strength elements(HFSEs,e.g.,Zr,Nb and REEs),and show clear elemental substitutions(e.g.,Ti ***+Fe+Al and Ca+Ti ***+Al+REE).High-precision LA-ICP-MS titanite dating yielded a u-pb age of 209.0±2.9 Ma,which represents the mainstage mineralization age at Huayangchuan,and is coeval with the local carbonatite dyke *** mineralization age is further constrained by the Re-Os dating of molybdenite from the Huayangchuan carbonatite,which yielded a weighted mean age of 196.8±2.4 *** Re contents(337.55-392.75 ppm)and C-OSr-Nd-pb isotopic evidence of the Huayangchuan carbonatite both suggest a mantle origin for the *** study supports that the Late Triassic carbonatite magmatism was responsible for the world-class u-Mo-REE mineralization in the Qinling Orogen,and that the regional magmatism and ore formation was likely caused by the closure of the Mianlue ocean and the subsequent North China-South China continent-continent collision.

关键词： Carbonatite-hosted u-Polymetallic deposits titanite u–pb dating Molybdenite Re–Os dating Huayangchuan deposit Qinling orogen

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