“秦岭-大别-苏鲁”造山带中“古特提斯缝合带”的连接  

A Connection between of the Paleo-Tethys Suture Zone in the Qinling-Dabie-Sulu Orogenic Belt

作　　者：许志琴[1,2] 李源[1] 梁凤华[1] 裴先治[3] 

机构地区：[1]大陆构造与动力学国家重点实验室中国地质科学院地质研究所,北京100037 [2]南京大学地球科学系内生金属矿床成矿机制研究国家重点实验室,南京210046 [3]长安大学地球科学与资源学院,西安710054

出　　处：《地质学报》2015年第4期671-680,共10页Acta Geologica Sinica

基　　金：国家自然科学基金委创新群体项目(编号40921001);中国地质调查局项目(编号12120114078201);(编号1212011120161);国土资源公益基金项目(编号201211093)资助的成果

摘　　要：中国大陆西北部的＂古特提斯缝合带＂如何与东面的＂秦岭-大别-苏鲁＂造山带连接,是涉及中国大陆中部构造格架的关键问题之一。南秦岭造山带中的古特提斯蛇绿岩带和东秦岭-桐柏-大别-苏鲁造山带中三叠纪高压-超高压变质带的对比,以及一条位于两者之间的220~204 Ma的大型左行走滑剪切带的存在,提供了它们之间关系的新的视角,为此,我们提出南秦岭的勉略蛇绿岩带向东通过宁陕-湘河大型左行走滑剪切带,和大陆俯冲与深俯冲造成的＂耀岭河-桐柏-大别-苏鲁＂高压—超高压变质带北缘连接,构成＂秦岭-大别-苏鲁＂造山带中的古特提斯缝合带新模式。沿着这条边界,南秦岭构造单元可以分为南部的南秦岭被动陆缘单元和北部的南秦岭主动陆缘单元,后者向东的延伸由于南、北板块之间三叠纪的剪切碰撞而尖灭。How the ＂Paleo-Tethyan suture zone＂ of NW China is connected with the ＂Qinling-Dabie-Sulu orogen to the east is one of the key issue in the tectonic framework of central China. Similarities between the Paleo-Tethys ophiolite zone in South Qinling and the Triassic HP-UHP metamorphic belt in the East Qinling - Tongbai-Dabie-Sulu orogen, as well the presence of a 214-200 Ma, large-scale, left-lateral shear zone between them, provide new insights into their relationship. Thus, we propose a new model in which the Mianlue ophiolitic belt （Zhang G Wet al., 2001） is connected with the northern edge of the ＂Yaolinghe-Tongbai-Dabie-Sulu belt to the east by the Ningshan-Xianghe left-lateral shear zone. This shear zone divides tb.e South Qinling terrane into the South Qinling passive continental margin unit to the south and the South Qinling active unit to the north, which pinches out to the east due to shearing between the NCB and SCB during the Triassic

关 键 词：秦岭-大别-苏鲁造山带 古特提斯蛇绿岩带 高压—超高压变质带 宁陕-湘河左行走滑剪切带 

分 类 号：P542[天文地球—构造地质学]