尹福光,孙志明,白建科

• 1:成都地质矿产研究所

摘要(Abstract)：

东川、滇中地区是上扬子陆块出露元古代地层最广泛的地区,但露头又断续分布在不同的地点。由于缺乏古生物及年龄资料,在不同地区多以岩性进行地层划分与对比,而出现了"正层"与"倒层"观点之分歧。通过对东川及滇中地区地层中所夹的火山岩年龄测试及重要界面的观察与研究,发现东川地区黑山组凝灰岩中锆石U-PbSHRIMP年龄为1503±17 Ma,滇中地区黑山头组凝灰岩中锆石U-Pb SHRIMP年龄为1047±15 Ma,它们不是同一时段的沉积产物,不能进行简单地对比,并证实两个地区都为"正层序"。因而,建议各自保持自已的地层分区,独立建立自已的地层序列。

关键词(KeyWords)： 地层层序;地层格架;锆石U-Pb SHRIMP年龄;中元古代;东川;云南

Abstract:

Keywords:

基金项目(Foundation): 国土资源大调查项目“西南地区基础地质调查综合研究”(No.1212010610213);; 国家973项目(No.2009CB421003);; 国家自然科学基金项目(No.40773001)

作者(Author): 尹福光,孙志明,白建科

DOI: 10.19839/j.cnki.dcxzz.2011.01.006

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