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地质学报  2009 

内蒙古西乌旗南部石炭纪石英闪长岩地球化学特征及其构造意义

, PP. 365-376

Keywords: 西乌旗,石英闪长岩,地球化学,晚石炭世,古亚洲洋

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Abstract:

内蒙古西乌旗地区位于贺根山蛇缘岩带和西拉木伦缝合带之间,区内岩浆岩分布广泛。本文对达其浑迪和金星石英闪长岩进行了锆石LAICPMSUPb定年,结果表明两个岩体分别形成于325±3Ma和322±3Ma。岩石学和地球化学分析结果显示岩石属于低钾拉斑系列和钙碱性系列,相对富集Rb、Ba、K等大离子亲石元素(LILE),亏损Nb、Ta、Ti、P等高场强元素化学。地球化学成分表明岩体具有俯冲带成因的特征。通过区域对比分析,苏左旗和西乌旗地区均发育一套角闪闪长岩、石英闪长岩、英云闪长岩及花岗闪长岩组合,与岛弧和活动大陆边缘岩浆岩组合相似,共同构成早石炭世晚期到晚石炭世的岩浆弧,该岩浆弧的出现与古亚洲洋板片向北俯冲有关。

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