青海海西州乌北地体晋宁期柯柯沙花岗片麻岩锆石U-Pb年龄证据
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摘要
在前人认为的震旦纪末期青海西部乌北地体柯柯沙花岗片麻岩中采集了2件同位素年龄样品,用LA-ICP-MS法测得其中锆石的~(206)Pb/~(238)U年龄加权平均值分别为826±6Ma(MSWD=0.84,n=12)和810±7Ma(MSWD=0.93,n=10)。这2个年龄值表明,柯柯沙花岗片麻岩属于晋宁运动早期的岩浆作用产物,与中国众多的晋宁期花岗岩一起响应了全球罗迪尼亚(Rodinia)超大陆在中国西北部的汇聚或离散演化。
The Kekesha granite in North Wulan terrane of western Qinghai Province has been constrained to be formed at the end of Sinian period(543±13 Ma) with thermal ionization mass spectrometer(TIMS) in the previous regional geological survey. In this study, the authors reported two U-Pb ages of 826±6 Ma and 810±7 Ma by in situ LA-ICP-MS dating method, which reveals that the intrusion of Kekesha granite was related to early Jinning Movement. The new result in conjunction with the other Jinning period granitoids documented information provides evidence for the assembly or breakup of the Rodinia supercontinent in Northwest China.
The Kekesha granite in North Wulan terrane of western Qinghai Province has been constrained to be formed at the end of Sinian period(543±13 Ma) with thermal ionization mass spectrometer(TIMS) in the previous regional geological survey. In this study, the authors reported two U-Pb ages of 826±6 Ma and 810±7 Ma by in situ LA-ICP-MS dating method, which reveals that the intrusion of Kekesha granite was related to early Jinning Movement. The new result in conjunction with the other Jinning period granitoids documented information provides evidence for the assembly or breakup of the Rodinia supercontinent in Northwest China.
引文
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(2)青海省地质矿产勘查开发局.1∶25万阳康幅区域地质调查报告.2009.
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