科研之友
微信
新浪微博
Facebook
分享链接
摘要
To explain the roughly contemporary magmatic activities between Cathaysia Block and both sides of the Jiangnan Orogenic Belt, we discussed the magmatic-ore related and closely compressive tectonism in the Gan-Hang Belt. Also, we compared the Yongping Pluton and Yinshan volcanic-plutonic rocks in northeastern Jiangxi, and Huangshitan and other plutons in the northern Zhejiang, which were produced in the setting of compressive tectonism. We compared bimodel dikes and Sanqingshan A-type granite in the northeastern Jiangxi, and Huanshitan and other A-type granites in the northern Zhejiang, which formed in the setting of extension. We proposed that approximately in Middle Jurassic time (175 +/- 5Ma), South China entered into the tectonic system, roughly from south to north oblique subduction of the Paleo-Pacific Plate. The intermission period of the magmatic activities in Japan and South Korea (similar to 170-120Ma) was actually the period of the large-scale magmatic-ore forming activities in South China. Thus, this oblique subduction resulted in the dynamic imbalance and mutual movement from the deep part to the shallow part of the crust among surrounding blocks of South China and the multiple blocks of South China including those orogens between the North and South China blocks, between the Yangtze Craton and Cathayasian Block, and between the South China Block and Indosinian Block, as well as microcontinental blocks within Cathaysia Block. At present, we cannot rule out the influence of compressional-extensional tectonism for the Gan-Hang Belt controlled by the Paleo-Asia tectonic system.
- 出版日期2018-9
- 单位浙江大学
