摘要
在介绍郯庐断裂东西两侧EW向构造基本特征的同时 ,从将秦岭带理解为高级协和函数和边界条件差异及构造复合等方面具体探讨了下述问题 :为什么秦岭带东延后构造形迹显得宽散零落 ?NE向的苏鲁变质岩构造带何以也成为秦岭构造带的成分 ?重塑了“老淮阳弧构造” ,指出在郯庐断裂东侧 ,古老的秦岭带发生北移 ,中新生代秦岭带又在原来的纬度上产生 ,其构造形迹北抵海州湾两侧 ,南达杭州湾附近。还探讨了该区高压变质带的形成深度和动力学机制 ,指出含柯石英榴辉岩 ,在构造应力参与下 ,地壳深部即可能生成 ,除了华北与扬子两大地块的碰撞与挤压 ,也不能排除来自太平洋方面的影响。
WT5”BZ]When introducing the basic properties of EW strike structure at the east and west sides of Tanlu Fault, the author made a concrete discussion on the following problems based on the understanding of Qinling Belt as senior coordinate function, boundary condition differentiation and structural composition:the reason why the structural features of Qinling Belt became wide and scattered after east extension; the reson why Su Lu Metamorphic Belt turned into a part of Qinling Tectonic Belt; Remolded “the Old Huaiyang Arc structure”, stating that at the east side of Tanlu Fault, the old Qinling Belt moved northwardly and Middle Mesozoic Qinling Belt was formed at its original latitude, its structural features reached north to the both sides of Haizhou Bay and south close to Hangzhou Bay. In addition, the paper discusses the formation depth and mechanism of high pressure belt of the studied region, stating that coesite bearing eclogite was possibly formed in the deep crust because of the participation of structural stress. Besides the collision and compression of North China Plate and Yangzi Plate, other influence from the Pacific Ocean was also possible. [WT5HZ]
出处
《江苏地质》
2000年第2期75-80,共6页
Jiangsu Geology
关键词
秦岭构造带
东延
高压变质带
形成深度
Qinling Tectonic Belt
East extension
Coordinate function
High pressure metamorphic belt
Formation Depth
Formation mechanism
