期刊文献+

中国东部晚中生代A型花岗岩的构造制约 预览 被引量:123

THE TECTONIC CONSTRAINT ON THE LATE MESOZOIC A-TYPE GRANITOIDS IN EASTERN CHINA
在线阅读 下载PDF
收藏 分享 导出
摘要 沿中国东部出露一条晚中生代巨型A型花岗岩带。根据时、空分布特点,可将其肢解为两期五带;第一期居岩时代为135-100Ma,包括下扬子带、苏鲁带、山海关带和碾子山带;第二期成岩时代为100-70Ma,位于中国东南沿海的闽浙带。它们不仅表现出不同的岩石组合特征,而且在岩体位形态上也呈现出明显的区域性变化。研究表明:第一期A型花岗岩产于东亚具有宽广剪切活动的活动大陆边缘(160-100Ma),其形成与大 A giant Late Mesozoic A-type granitoid zone occurred in east China can be divided into five sub -zones of two episodes. The products of the first episode(135~100Ma) include lower Yangzi zone,Northern Jiangsu-Jiaonan zone,Shanhaiguan zone and Nianzishan zone,and those of the second one(100~70Ma) are located at the Southeastern coast of China named Fujian-Zhejiang zone. They exhibit not only various rock assemblages but also obvious regional change in their emplacement patterns of the intrusives for the different zones and episodes. The study indicates that the A-type granitoids of the first episode were produced in the continent- continent collision transpression orogenic zone in the eastern Asia active continental margin where wide shearing tectonics was well developed (160~100Ma ), and emplaced in the places where the extensional jogs of P-shears and the collapse in the junction of P,T, and R shear zones were developed. which was generated by the intensive transtension in the pressure-shear stress field setting. The A-type granitoids of the second episode were produced in the collisional zone of the accretional terrane in the oblique subduction continental margin of southeast China,and related to the back--arc extension resulted from the Kula plate subducted beneath the Euroasian plate(10070Ma). The magmas emplaced in the areas of collapse which was generated by the differential uplifting and depression of the crust. Moreover, the extensional degree is possibly one of the important factor that constrained the formation of the A-type granitoids and affected the characteristics of the magma nature and emplacement.
作者 王德滋 赵广涛 Wang Dezi; Zhao Guangtao; Qiu Jiansheng(Department of Earth Solences, Nanjing University,Institute of Mineral Resources,Ocean University of Qingdao)
出处 《高校地质学报》 CAS CSCD 1995年第2期 13-21,共9页 Geological Journal of China Universities
关键词 A型花岗岩 构造制约 晚中生代 花岗岩 A-type granitoid, tectonic constraint, Late Mesozoic, east China
  • 相关文献

参考文献9

二级参考文献105

共引文献566

同被引文献3893

引证文献123

二级引证文献2382

投稿分析

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部 意见反馈