青藏高原羌塘早古生代蛇绿岩——堆晶辉长岩的锆石SHRIMP定年及其意义
Discovery of Eopaleozoic ophiolite in the Qiangtang of Tibet Plateau: Evidence from SHRIMP U-Pb dating and its tectonic implications
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摘要: 羌塘中部果干加年山西段发现完整的蛇绿岩组合,由变质橄榄岩、堆晶辉长岩、辉长岩岩墙群、玄武岩、硅质岩等组成.对堆晶辉长岩进行地球化学和定年初步研究,堆晶辉长岩具有洋中脊玄武岩的地球化学特征,获得锆石SHRIMP U-Pb谐和年龄为438±11Ma,是羌塘地区乃至青藏高原南部首次发现完整早古生代的蛇绿岩.结合角木日地区二叠纪蛇绿岩、双湖以东的晚泥盆世法门期和二叠纪一三叠纪放射虫硅质岩的研究,羌塘中部古特提斯洋盆可能形成于早古生代,持续演化到三叠纪,并且可能是一个连续过程,使我们对青藏高原古特提斯洋的历史及其演化阶段的划分需要重新思考.
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