Zircon U-Pb dating of granites in Gejiu superlarge tin polymetallic orefield and its significance
Zircon U-Pb dating of granites in Gejiu superlarge tin polymetallic orefield and its significance
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发表时间：
2009
影响因子：
4.8
通讯作者：
Cheng Yan;M. Key
中科院分区：
文献类型：
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作者：
Cheng Yan;M. Key
云南个旧锡多金属矿田分布着大量的火成岩，花岗岩与矿床有一定的成因联系。SHRIMP和LA-ICP-MS锆石U-Pb定年结果表明：龙岔河斑状花岗岩的年龄为（81.2±1.4）~（83.2± 1.4）Ma，马拉格-松树家斑状花岗岩的年龄为（82.8±1.7）Ma，老厂斑状花岗岩的年龄为（83.3±1.6）Ma，白沙冲等粒花岗岩的年龄为（77.4±2.5）Ma。根据这些资料，结合本研究获得的新资料，认为滇东南和桂西在燕山晚期属于同一大地构造背景，但与藏南-三江锡矿带明显不同。
Lots of igneous rocks are distributed in the Gejiu tin polymetallic orefield of Yunnan Province, and granites here are considered to have some original connection with the ore deposits. SHRIMP and LA-ICP-MS zircon U-Pb dating yielded some age data: the Longchahe porphyritic granite is (81.2±1.4)～(83.2±1.4) Ma, the porphyritic granite in Malage-Songshujia area is (82.8±1.7) Ma, the porphyritic granite in Laochang area is (83.3±1.6) Ma and the Baishachong equigranular granite is (77.4±2.5) Ma. Based on these data together with some new data obtained in this study, the authors hold that southeast Yunnan and west Guangxi belonged to the same geotectonic setting in Late Yanshanian period, but were obviously different from the south Tibet-Three River tin belt.