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地质学报  2012 

扬子克拉通西南缘中元古代通安组的形成时代――锆石LA-ICPMSU-Pb年龄

, PP. 1479-1490

Keywords: 锆石LA-ICP-MSU-Pb年龄,中元古代,通安组,辉长-闪长岩脉,碎屑锆石,扬子克拉通西南缘

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Abstract:

通安组是扬子克拉通西南缘褶皱基底的组成部分,可分为5个岩性段。本文利用凝灰质粉砂岩(样品100620-1)中碎屑锆石和侵入通安组的辉长-闪长岩脉(样品100620-1-1和样品100620-2-2)中岩浆锆石的LA-ICP-MSU-Pb年龄探讨通安组的形成时代。通安组三段中凝灰质粉砂岩的碎屑锆石有两个主要的峰值年龄,分别为1.8~1.9Ga和2.28~2.38Ga,这表明通安组三段的沉积物来自不同的物源区。该凝灰质粉砂岩中最年轻的3粒锆石的??207?Pb/???206?Pb?平均年龄为1806Ma。从侵入到通安组第三段的辉长-闪长岩的岩浆锆石中获得了1513±13Ma的??207?Pb/???206?Pb?加权平均年龄(样品100620-2-1)和1531±18Ma的上交点年龄(样品100620-2-2)。这些新获得的年龄数据可以限定通安组的形成时限为1.8~1.5Ga。辉长-闪长岩脉1513Ma和1531Ma的年龄数据与东川群黑山组火山凝灰岩1503±7Ma的年龄结果相似,表明侵入到通安组三段中的辉长-闪长岩脉与东川群黑山组的火山凝灰岩形成于一个岩浆旋回的同一阶段。因此,通安组三段大致相当于云南东川群的黑山组。

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