Isotopic Chronological Study of the Huangsha‐Tieshanlong Quartz Vein‐ Type Tungsten Deposit and Timescale of Molybdenum Mineralization in Southern Jiangxi Province,China |
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| Authors: | HUANG Fan FENG Chengyou CHEN Yuchuan YING Lijuan CHEN Zhenghui ZENG Zailin QU Wenjun |
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| Institution: | 1. Key Laboratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;2. Chinese Academy of Geological Sciences, Beijing 100037, China;3. National Research Center of Geoanalysis, Beijing 100037, China |
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| Abstract: | The Huangsha‐Tieshanlong quartz‐vein tungsten polymetallic ore deposit, located in the northern Pangushan‐Tieshanlong tungsten ore field in eastern Ganxian‐Yudu prospecting areas of the Yushan metallogenic belt, is a well‐known tungsten deposit in southern Jiangxi province, China. SHRIMP‐determined dating of zircons from the Tieshanlong granite yields ages of 168.1±2.1 Ma (n=11, MSWD=1.3). Rhenium and osmium isotopic dating of molybdenite from the Huangsha quartz‐vein tungsten deposit determined by ICP‐MS yields a weighted average ages of 153±3 Ma and model ages of 150.2±2.1 Ma – 155.4±2.3 Ma. The age of the Huangsha tungsten deposit is 10 to 15 Ma later than the Tieshanlong granite, which shows that there might have been another early Late Jurassic magmatic activity between 150 and 160 Ma, a process which is closely related with tungsten mineralization in this area. The Tieshanlong granite, the Huangsha tungsten deposit and the Pangushan‐Tieshanlong ore field were all formed around 150–170 Ma, belonging to products of a Mesozoic second large‐scale mineralization. According to the collected molybdenite Re‐Os dating results in southern Jiangxi province, the timescale of the associated molybdenum mineralization is 2–6 Ma in the tungsten deposit and the timescale of independent molybdenum mineralization is 1–4 Ma, implying the complexity of tungsten mineralization. Times of molybdenum mineralization are mainly concentrated in the Yanshanian, which includes three stages of 133～135 Ma, 150–162 Ma, and 166–170 Ma, respectively. The 150–162 Ma‐stage is in accordance with ages of large‐scale W‐Sn mineralization, which is mainly molybdenum mineralization characterized by associated molybdenum mineralization with development of an even greater‐intensity independent molybdenum mineralization. Independent molybdenum mineralization occurred before and after large‐scale W‐Sn mineralization, which indicates that favorable prospecting period for molybdenum may be in Cretaceous and early late Jurassic. |
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| Keywords: | SHRIMP zircon U‐Pb molybdenite Re‐Os ages timescale granite quartz vein‐type tungsten deposit Huangsha Tieshanlong Jiangxi |
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