Some Neoproterozoic Geological Events Involved in the Development of the Jiangnan Orogen
详细信息
- 责任者：Zhou Jincheng (State Key Laboratory of Mineral Deposits Research ; School of Earth Sciences and Engineering ; Nanjing University ; Nanjing 210093 ; China) ; Wang Xiaolei
- 刊名：Geological Journal of China Universities
- 出版年：2009
- 卷期：15(4)
- 关键词：造山带 ; orogenic belts ; 地质事件 ; geological event ; 江南古陆 ; Jiangnan Old Land
- 页码：p.453-459
- 图表：1 illus., 1 table, 33 refs.
- 分类号：0300
- issnNo：ISSN1006-7493
- isbnNo：CN32-1440/P
摘要
The characteristics of the komatiitic basalts, quartz-keratophyre and rhyolitic tuff formed in the subducted stages of the oceanic crust as well as the two kinds of basic rocks formed in the post-orogenic extensional stage in the development of the (middle-) western Jiangnan orogen are reported in the paper. The kamatiitic basalts are considered to be the high-MgO basalts formed in island-arc settings. Their high Ni and Cr contents suggest that they were the primary basalts derived from the sub-arc mantle. Therefore, the authors believe that there existed coeval arc magmatism and sedimentation along the southeastern margin of the Yangtze Block during the Neoproterozoic.
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