皖浙赣交界莲花山岩体U-Pb锆石年龄及其地质意义

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皖浙赣交界莲花山岩体位处扬子板块东南缘,即扬子板块与华夏板块结合带之东段(江南造山带东段北缘).该岩体侵入于新元古代末期的上墅组(赣东北),岩性主要为正长花岗岩及花斑岩,后期因变质变形作用而发生面理化并具有绿片岩相浅变质矿物组合.地球化学特征指示,莲花山花岗岩很有可能为形成于大陆边缘后造山环境的A2型花岗岩.锆石LA-ICP-MS U-Pb定年结果显示岩体年龄为878±70 Ma,为晋宁晚期的产物.
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