| 泰国西部比洛克(Pilok)锡钨矿区二长花岗岩SHRIMP锆石U-Pb年龄及其地质意义 |
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| 引用本文： | 施美凤,林方成,范文玉,王宏,丛峰,朱华平.泰国西部比洛克(Pilok)锡钨矿区二长花岗岩SHRIMP锆石U-Pb年龄及其地质意义[J].地质通报,2015,34(4):769-779. |
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| 作者姓名： | 施美凤 林方成 范文玉 王宏 丛峰 朱华平 |
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| 作者单位： | 中国地质调查局成都地质调查中心，四川成都610081 |
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| 基金项目： | 中国地质调查项目（编号：1212011220912 和1212011120337） |
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| 摘 要： | 使用SHRIMP技术测得泰国西部比洛克(Pilok)钨锡矿区的2件二长花岗岩的锆石U-Pb年龄分别为181.7±4.8Ma和175.3±3.3Ma,属于早侏罗世Toarcian期,代表了岩体的侵位年龄。岩石主量和微量元素特征分析表明,比洛克钨锡矿区的二长花岗岩为高钾钙碱性S型过铝质花岗岩。结合区域地质特征,比洛克矿区二长花岗岩应是班公湖—怒江—抹谷洋壳向西侧的腾冲—德林达依陆块俯冲的产物。
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| 关 键 词： | SHRIMP 锆石U-Pb 年龄 早侏罗世 比洛克 泰国 东南亚 |
SHRIMP zircon U-Pb dating of the monzogranites in the Pilok tintungsten mining area, western Thailand, and its geological implications |
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| SHI Meifeng,LIN Fangcheng,FAN Wenyu,WANG Hong,CONG Feng,ZHU Huaping.SHRIMP zircon U-Pb dating of the monzogranites in the Pilok tintungsten mining area, western Thailand, and its geological implications[J].Geologcal Bulletin OF China,2015,34(4):769-779. |
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| Authors: | SHI Meifeng LIN Fangcheng FAN Wenyu WANG Hong CONG Feng ZHU Huaping |
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| Institution: | Chengdu Center of Geological Survey, China Geological Survey, Chengdu 610081, Sichuan, China |
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| Abstract: | The Pilok tin-tungsten mining area is located in the central segment of the west granite belt in Southeast Asia, western Thailand. The precise dating of the granites from the mining area is very important for deep understanding of the crystallization time and tectonic background of this granite belt as well as the regional magmatism-mineralization. The new SHRIMP U-Pb dating results of magmatic zircons in two monzogranite samples from the Pilok tin-tungsten mining area of western Thailand show that their crystallization ages are 181.7±4.8Ma and 175.3±3.3Ma respectively, belonging to the Toarcian period of early Jurassic. Geochemical analyses reveal that the monzogranites are of the high-K calc-alkaline and peraluminous S-type. Combined with regional geological setting, the authors hold that the monzogranites in Pilok mining area should be the products of the Bangonghu-Nujiang-Mogok oceanic crust which subducted beneath the west Tengchong-Tanintharyi continental block. |
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| Keywords: | SHRIMP zircon U-Pb dasting Early Jurassic Pilok Thailand Southeast Asia |
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