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地球学报  2003 

蚌埠淮光“混合花岗闪长岩”的形成时代及源区:锆石SHRIMPU-Pb地质年代学证据

Keywords: 锆石,U-Pb定年,花岗闪长岩,SHRIMP,蚌埠

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Abstract:

对蚌埠淮光花岗闪长岩的岩相学和锆石阴极发光图象研究表明,淮光"混合花岗闪长岩"为岩浆结晶作用的产物,岩石形成后受到了应力作用的改造.锆石SHRIMPU-Pb定年结果和岩浆锆石的SHRIMPU-Pb年龄显示淮光花岗闪长岩形成于130.0±2.0Ma;大多数继承锆石的年龄集中在1800~1900Ma、2300~2517Ma和3443Ma,这意味着淮光花岗闪长岩的母岩浆起源于华北地块基底的部分熔融.早白垩世(130Ma左右)的岩浆作用是引起继承锆石和碎屑锆石Pb丢失的重要原因,同时也是华北地块东部岩石圈减薄的最重要时期.130Ma左右的岩浆作用和岩石圈减薄应与太平洋板块的俯冲相联系.

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