滇中地区昆阳群物源及构造环境

被引：19

作者：

纪星星 ^{[1
,2
,3
]}

周诗 ^{[2
]}

陈棋 ^{[2
]}

刘德民 ^{[2
]}

李德威 ^{[2
,4
]}

机构：

[1] 贵州省工程防震研究院

[2] 中国地质大学地球科学学院

[3] 贵州省地震局

[4] 中国地质大学地质调查研究院

来源：

中国地质 | 2016年 / 43卷 / 03期

关键词：

昆阳群; 碎屑锆石; 地球化学; 物源; 构造环境;

D O I：

暂无

中图分类号：

P548 [区域构造地质学];

学科分类号：

070904 ;

摘要：

昆阳群的形成时代、沉积环境、源岩性质等一直存在较大争议,为了查明滇中地区昆阳群的物源及其形成的构造环境,文章在分析昆阳群沉积组合和沉积相的基础上,对昆阳群3件变质砂岩样品中的碎屑锆石进行LA-ICPMS锆石U-Pb年龄测定,对昆阳群20件极低级变质碎屑岩进行地球化学分析。从昆阳群黄草岭组、黑山头组和美党组中分别获得了最年轻的谐和年龄为984.0 Ma、945.0 Ma和954.0 Ma;碎屑锆石年龄峰谱显示,在1.0 Ga、1.35Ga、1.73 Ga和2.44 Ga出现了统计峰值,其年龄主要集中在1.73 Ga和1.35 Ga。表明昆阳群源区主要经历了1.0 Ga、1.35 Ga、1.73 Ga和2.44 Ga的构造热事件,资料显示扬子地块西南缘出露的大红山群形成时代为1.7 Ga,格林威尔期的构造热事件时期为1.0～1.3 Ga。此外,地球化学分析结果表明昆阳群源岩主要是形成于大陆岛弧—活动大陆边缘的石英质旋回沉积、长英质岩石和少量镁铁质岩石。在中元古代晚期—新元古代早期(0.95～1.0 Ga),Rodinia超大陆形成阶段,在扬子地块西南缘的弧后前陆盆地中形成昆阳群的沉积组合,物源主要来自扬子地块西南缘的大红山群和格林威尔期岛弧的岩石。

引用

页码：857 / 878

页数：22

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