| 付建明.湖南锡田云英岩-石英脉型钨锡矿的形成时代及其
赋矿花岗岩锆石SHRIMP U-Pb 定年[J].地质与勘探,2012,48(2):313-320 |
| 湖南锡田云英岩-石英脉型钨锡矿的形成时代及其
赋矿花岗岩锆石SHRIMP U-Pb 定年 |
| Geochronology of the Greisen-Quartz-Vein Type Tungsten-TinDeposit and Its Host Granite in Xitian,Hunan Province |
| 投稿时间：2010-11-06 修订日期：2011-07-06 |
| DOI： |
| 中文关键词: 石英包裹体Rb-Sr法 锆石SHRIMP U-Pb法 成岩成矿时代 云英岩脉型钨锡矿 湖南锡田 |
| 英文关键词: fluid inclusion Rb-Sr isochron,zircon SHRIMP U-Pb dating,age of rock formation and mineralization,greisen-quartz vein-type tungsten-tin deposit,Xitian,Hunan Province |
| 基金项目:中国地质调查局项目(1212010533307)资助 |
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| 中文摘要: |
| [摘 要] 具超大型规模远景的湖南锡田钨锡多金属矿床是1999 年开始的新一轮国土资源大调查的重大发现之一。矿床产于锡田复式花岗岩体与碳酸盐岩接触带及岩体内部。矿床类型主要为矽卡岩型,其次为破碎带蚀变岩型和云英岩-石英脉型。采用石英流体包裹体Rb-Sr 法和锆石SHRIMP U-Pb法分别获得:云英岩-石英脉型钨锡矿形成年龄为153±12Ma(MSWD=0.80),其赋矿花岗岩形成年龄为147±3Ma(MSWD= 0.90),加权平均年龄为147郾0依3郾5 Ma(MSWD =0郾23),两者在误差范围内一致;并进一步证实,锡田钨锡多金属矿的主成矿期是燕山早期。 |
| 英文摘要: |
| Abstract: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±12Ma(MSWD=0.80),and zircon SHRIMP U-Pb dating indicates that host granite was formed at 147.0±3.5 Ma(MSWD =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. |
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