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地质论评  2003 

赣东北珍珠山群同位素年代学研究

Keywords: 珍珠山群同位素年代学同位素年龄单颗粒锆石U-Pb法区域深层构造中元古代蓟县纪

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Abstract:

赣东北婺源―乐平地区浅变质地层珍珠山群的地质时代,以往普遍认为归属于中元古代,但由于缺乏高精度的同位素测年资料,时代归属尚存争议,目前主要有中元古代、古元古代和晚古生代3种认识。近期开展的1:5万区域地质调查工作,采用单颗粒锆石U-Pb法获得一批介于1113±118Ma~1379±65Ma间的同位素年龄数据,从而将珍珠山群时代合理地厘定为中元古代蓟县纪;此外,还获得了代表捕获晶体或残留的继承性浑圆状锆石表面年龄2497±19Ma和含量极少的结晶锆石年龄1827±76Ma,推断珍珠山群之下还掩埋着古元古代地层或岩石,为区域深层构造研究提供了新的资料。

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