摘要
扬子陆块北缘毛堂群记录了Rodinia裂解事件的重要地质信息。从四个方面分析论证了毛堂群火山岩形成于新元古代中晚期大陆板内裂谷环境:(1)火山岩的地球化学特征,主要通过稀土及多元素配分模式体现;(2)火山岩的成岩年龄;(3)火山碎屑岩的特点;(4)基性火山岩构造环境判别图解。毛堂群裂谷火山活动是一次全球性的由地幔柱活动引发的裂谷火山事件群的组成部分,是南秦岭前寒武纪大陆裂解的先兆。
The Maotang Group in the northern margin of the Yangtze Block recorded important information of Rodinia breakup.From the following four aspects：（1）Geochemical characteristics of volcanic rocks reflected Mainly through the rare-earth and multi-element distribution patterns;（2）Diagenetic age of volcanic rocks;（3）The characteristics of pyroclastic rocks;（4）Tectonic setting discrimination diagrams of mafic volcanic;It is analyzed and proved that Maotang Group was formed in rifting environment of the inner continent during middle-late Neoproterozoic.The volcanic event indicated by the Maotang formation is a part of the globle rifting and volcanic activity event which is thought to be triggered by mantle plume,and the harbinger of the Precambrian continental splitting of South Qinling.
出处
《东华理工大学学报（自然科学版）》
CAS
2010年第4期301-309,共9页
Journal of East China University of Technology(Natural Science)
