江汉平原周老孔中碎屑锆石LA-ICPMS定年及物源示踪

被引：21

作者：

王节涛 ^{[1
,2
]}

李长安 ^{[2
,3
]}

杨勇 ^{[2
]}

王秋良 ^{[2
]}

机构：

[1] 中国地质大学地质过程与矿产资源国家重点实验室

[2] 中国地质大学地球科学学院

[3] 中国地质大学生物地质与环境地质教育部重点实验室

来源：

第四纪研究 | 2009年 / 29卷 / 02期

关键词：

碎屑锆石; 物源示踪; 江汉平原; LA-ICPMS;

D O I：

暂无

中图分类号：

P597.3 []; P588.21 [碎屑岩];

学科分类号：

摘要：

碎屑锆石物源示踪是当今国际上研究大河演化的重要手段。通过对湖北省监利县周老镇钻孔中砂样Gsh6(86.76～88.58m)和Gsh10(126.22～128.42m)的碎屑锆石原位U-Pb年龄进行分析,并与周围可能源区的岩石年龄进行对比,发现Gsh6的U-Pb年龄主要可以分为11个年龄峰值:>3.0Ga,2490～2386Ma,2006～1784Ma,838～723Ma,654～625Ma,453～415Ma,257Ma,235Ma,212Ma,166Ma和<17Ma。Gsh10中碎屑锆石年龄表现出8个年龄峰值:>3.0Ga,2543～2273Ma,1979～1535Ma,835～723Ma,638Ma,451～423Ma,235Ma和212Ma。Gsh6比Gsh10多的3个年龄峰值表明长江流域面积逐渐扩大,其中257Ma的年龄峰值的出现表明峨眉山玄武岩已成为长江的源区,14.8±0.4Ma和16.5±0.3Ma锆石的出现,预示着长江源头已到达青藏高原。分析认为,Gsh6样沉积时(大约800kaB.P.),长江三峡已经贯通。

引用

页码：343 / 351

页数：9

共 23 条

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