Geochronology of the Greisen-Quartz-Vein Type Tungsten-Tin Deposit and Its Host Granite in Xitian, Hunan Province

详细信息   

• 责任者：Fu Jianming (Wuhan Centre of China Geological Survey ; CGS ; Wuhan 430205 ; China) ; Cheng Shunbo
• 刊名：Geology and Prospecting
• 出版年：2012
• 卷期：48(2)
• 关键词：钨矿 ; tungsten ores ; 锡矿 ; tin ores ; 铀—铅计时 ; U-Pb dating ; 湖南 ; Hunan Province
• 页码：p.313-320
• 图表：3 illus., 27 tables, 3 refs.
• 分类号：1001
• issnNo：ISSN0495-5331
• isbnNo：CN11-2043/P

摘要

The Xitian, Hunan Province tungsten-tin polymetallic deposit is one of the newly-discovered ones during the new round exploration in the Nanling range,which possesses a great potential of W＋Sn resources. Its tungsten-tin ore bodies occur in the contact zones between complex granite and carbonaceous rock and interior of rock bodies. In addition to dominant mineralization of skarn, altered rock in fractures zone and greisen-quartz vein types also characterize the deposit, respectively. In this work, fluid inclusions Rb-Sr dating and zircon SHRIMP U-Pb dating were conducted to constrain the ages of the tungsten-tin greisen-quartz vein and its host granite in Xitian. The Rb-Sr isochron result shows greisen mineralization occurred at 153 ＋ 12 Ma （MSWD = 0.80） , and zircon SHRIMP U-Pb dating indicates that host granite was formed at 147.0＋3.5 Ma（ M SWD =-0.23 ）. Both are consistent in the error range. This work further confirms that the Xitian tungsten-tin polymetallic deposit was formed primarily during the early Yanshanian epoch （ Jurassic -Cretaceous） as suggested by previous studies.