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地质学报  2009 

哀牢山-红河剪切带左行走滑作用起始时间约束

, PP. 1388-1400

Keywords: 点苍山,高温糜棱岩,显微构造,SHRIMP锆石定年,左行走滑,哀牢山-红河剪切带

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Abstract:

位于红河-哀牢山断层带NW延伸方向上的点苍山变质杂岩体遭受强烈的左行走滑剪切变形、变质作用改造,岩石中保存了典型的高温矿物组合以及由它们共同构成的宏观和微观高温构造特征,其中糜棱岩中具有极其发育的长石矿物拉伸线理而形成典型的L与L>>S型构造岩是其一个明显的特征。本文对点苍山地区高温糜棱岩内主要矿物开展了显微构造特点与矿物变形特点、变形机制分析及组构分析,并对于遭受高温糜棱岩化改造的一个花岗质岩体开展了SHRIMP锆石U-Pb定年分析。结果表明岩石中长石、角闪石、石英等主要矿物具有典型的达角闪岩相条件下的高温晶质塑性变形和动态生长特征,它们也为走滑剪切变形活动提供了充分的微观构造证据。对于点苍山高温糜棱岩化改造的眼球状或似斑状二长花岗岩的显微构造分析结果表明,这套花岗质岩石从走滑剪切前期岩浆的侵位之后经历了早期强烈的岩浆期后交代作用-亚岩浆流动-固态塑性高温剪切变形的递进演化过程。由此可见,岩浆的上升与就位之后受左行走滑剪切作用的制约,并遭受了强烈剪切变形改造。同时对这套同构造前期就位花岗质岩石中的锆石进行定年分析,获得33.88±0.32Ma的岩浆结晶年龄,为此,我们有充分的理由认为,在点苍山地区哀牢山-红河剪切带左行走滑剪切作用的起始时间至少应该为早渐新世30.88±0.32Ma。

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