扬子克拉通内新元古代中期酸性火山岩的年代学及其地质意义

被引：30

作者：

汪正江 ^{[1
]}

王剑 ^{[1
]}

段太忠 ^{[2
]}

谢渊 ^{[1
]}

卓皆文 ^{[1
,3
]}

杨平 ^{[1
]}

机构：

[1] 国土资源部成都地质矿产研究所

[2] Marathon Oil UKLTD,Aberdeen,Scotland,ABFZ,UK

[3] 中国地质科学院研究生部

来源：

中国科学:地球科学 | 2010年 / 40卷 / 11期

关键词：

扬子克拉通; 新元古代中期; 板溪群鹅家坳组; SHRIMP 锆石 U-Pb 测年; 幕式双峰式火成岩系列;

D O I：

暂无

中图分类号：

P597.3 []; P588.14 [喷出岩（火山岩）];

学科分类号：

070902 ; 070901 ;

摘要：

报道了贵州北部板溪群鹅家坳组晶屑凝灰岩SHRIMP锆石U-Pb年龄,结果显示扬子克拉通内板溪群沉积中期广泛的酸性火山事件的年龄是～780Ma.研究表明它们与扬子克拉通周边同期基性岩墙群和火山岩也构成了克拉通范围的双峰式岩浆活动系列,该期克拉通范围的双峰式火山岩浆组合仅是新元古代中期(835～720Ma)强烈的幕式火成岩系列的一部分.由此可见,扬子克拉通新元古代中期广泛的双峰式、幕式岩浆火山事件系列与弧陆碰撞造山构造模式是矛盾的,它们是裂解构造过程的记录,可能与导致Rodinia超大陆裂解的幕式地幔柱活动有关.

引用

页码：1543 / 1551

页数：9

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