南秦岭山柞旬-安康地区的两次逆冲推覆和Ⅱ型造山带基本特征  

Two phases over-thrusting nappe in Shanyang-Zhashui-Xunyang-Ankang region of the South Qinling and the basic characteristics of Ⅱ-type orogenic belt

作　　者：杨志华[1] 朱志军[1] 王北颖 周美夫[3] 赵太平 苏生瑞[1] 张虹波[1] 赵晓宁[1] 

机构地区：[1]长安大学地球科学学院,陕西西安710054 [2]陕西地勘局西安地勘院,陕西长安710100 [3]香港大学地球科学系 [4]河南省地质科学研究所,河南郑州450053

出　　处：《西北地质》2002年第1期1-14,共14页Northwestern Geology

基　　金：地矿部 (85 - 0 1- 0 18);国家自然基金 (492 72 136 );国家计委 (96 - 30 - 4 3);国家科委(96 - 914- 0 1)等项目资助

摘　　要：界于东经 10 8°30′～ 110°,商丹带 -勉略带 (或大巴山带 )之间的山柞旬 -安康构造带是在古生代 -三叠纪南北向裂陷 -裂谷板内海相沉积盆地基础之上转化形成的 型造山带 ,它与东、西两侧的武当 -商南带、佛坪 -汉南带的组成、结构均不相同。南秦岭的山柞旬 -安康带开始从南向北以及后来再自北向南的两次逆冲推覆所形成的构造格局 ,与目前都认为该区是从北向南指向四川盆地的滑脱—逆冲式的薄皮构造模式是完全不同的。笔者还简要讨论了The Shanyang-Zhashui-Xunyang-Ankang tectonic belt lying in 108°30′～110°,and between Shangxian-Danfeng and Mianxian-Lueyang (or Dabashan) tectonic belts, is Ⅱ-type orogenic belt that was formed in Palaeozoic-Triassic by the transfomation from N-S trending intraplate oceanic sedimentary basin.It is different from Wudang-Shangnan tectonic belt to its east and Foping-Hannan tectonic belt to its west in the composition and structure.The tectonic pattern produced by over-thrusting from south to north at the beginning and the over-thrusting from north to south late in Shanyang-Zhashui-Xunyang-Ankang region of the South Qinling is completely from the thin-skinned structural model in which the region was slide-thrusted toward Sichuan basin from north to south.This paper also discussed the basic features of Ⅱ-type orogenic belt.

关 键 词：山柞旬—安康带 结构 两次推覆 Ⅱ型造山带 南秦岭 

分 类 号：P542[天文地球—构造地质学]