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地质学报  2012 

滇南新元古代的岩浆作用:来自瑶山群深变质岩SHRIMP锆石U-Pb年代学证据

, PP. 1584-1591

Keywords: 新元古代岩浆活动,SHRIMP锆石UPb定年,瑶山群,滇南

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Abstract:

滇南瑶山―哀牢山地区出露一套呈NW―SE向狭长条带状展布的深变质岩系――下元古界瑶山群和哀牢山群,并认为存在前寒武纪的结晶基底。本文选取瑶山群眼球状花岗质糜棱岩和金平阿得博的片麻状花岗岩作为研究对象,进行SHRIMP锆石UPb定年。结合阴极发光图像,获得岩浆锆石的结晶年龄为828±6.2Ma(?N?=11,?MSWD?=1.8)和748~801Ma。同时,作者在墨江元江剖面的哀牢山群黑云母花岗闪长质片麻岩中获得SHRIMP锆石核部UPb年龄为769~893Ma。研究揭示滇南的瑶山和哀牢山地区存在新元古代岩浆作用。瑶山群中古老残余锆石核部的984Ma年龄和哀牢山群中古老残余锆石核部年龄1104~1353Ma及2655Ma,表明该区存在中元古代或太古代的结晶基底,研究区很可能位于南华裂谷与康滇裂谷的交汇部位,新元古代的岩浆活动可能与Rodinia超大陆聚合―裂解过程有关。这为构筑Rodinia超大陆聚散过程和揭示华南大地构造演化史提供年代学方面证据。

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