Acta Metallurgica Sinica
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YU Quan,CHEN Guohua,KANG Chuan
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Abstract: The Zhuxi tungsten deposits are superlarge ore deposits, discovered in recent years in the eastern segment of Jiangnan orogenic belt. The ore bodies of the Zhuxi deposits mainly occur in the skarn and skarnized marble at the contact zone between Yanshan intrusive rocks and carbonate. To better understand the characteristics and genesis of Zhuxi tungsten deposits, we collected both granites and skarns samples, and carried out research on petrology, mineralogy, geochemistry and chronology. The petrological and geochemical characteristics of the biotite granites are calc-alkaline and peraluminous,enriched in Rb,U,Ta,and depleted in Ba,Nb,Sr and Ti. The rare earth elements are characterized by the relatively low total content with a slightly rightly-dipping REE pattern. Electron microprobe analyses reveal that the garnet is mainly composed of grossularite-andradite, and the pyroxene mainly belongs to diopside-andradite series. Sheelite coexists with many F-rich minerals such as fluorite, apatite, titantites, and vesuvianite. The F-enriched ore-forming fluid facilitates the transfer of W and the mineralization of scheelite in the Zhuxi deposits. The fluid characteristic reflected by the REE distribution curve and Mo content variations of scheelite indicate that the mineralization environment of zhuxi tungsten deposits changed from oxidation to reduction environment in the skarn stage. In-situ U-Pb dating of titanite by LA-ICP-MS shows that titanite from the skarn sample yields a weighted mean 206Pb /238U age of 153±2 Ma. The main mineralization event occured in the Yanshanian, which is consistent with the age of Zhuxi granites .
Key words: Zhuxi tungsten deposits, skarn, scheelite, titantite U-Pb daing
YU Quan,CHEN Guohua,KANG Chuan. Study of Metallogenic Chronology, Mineralogy and Ore-Forming Process of the Superlarge Tungsten Deposits in Zhuxi, Jiangxi Province[J]. Acta Metallurgica Sinica.
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URL: https://geology.nju.edu.cn/EN/
https://geology.nju.edu.cn/EN/Y2018/V24/I6/872