在南岭花岗岩带中燕山早期的岩浆岩套花岗岩类占绝对优势,以二长花岗岩和钾长花岗岩为主.在岩带的东段赣南和闽西南地区,存在燕山早期的A型花岗岩类（176～178 Ma）和双峰式火山岩（158～179 Ma）组合,在岩带中部湘南地区存在燕山早期...在南岭花岗岩带中燕山早期的岩浆岩套花岗岩类占绝对优势,以二长花岗岩和钾长花岗岩为主.在岩带的东段赣南和闽西南地区,存在燕山早期的A型花岗岩类（176～178 Ma）和双峰式火山岩（158～179 Ma）组合,在岩带中部湘南地区存在燕山早期的玄武岩类（177～178Ma）.赣南地区的双峰式火山岩组合中酸性端员流纹岩和A型花岗岩类同具有板内花岗质岩石的地球化学特征,基性端员玄武岩为板内拉斑玄武岩,湘南地区的玄武质岩石不仅为板内拉斑玄武岩而且发育有板内碱性玄武岩.鉴此,南岭地区燕山早期的岩浆岩套无疑是一种典型的后造山（Post-orogenic）岩石组合.后造山岩套是后碰撞（Post-collision or Late orogenic）事件结束和泛大陆开始裂解的标志,预示着一个新的造山的威尔逊旋回即将来临.因此可以认为南岭地区燕山早期应是继印支造山运动以后的一种后造山的大陆裂解的地球动力学背景,并非自白圣纪以来才开始裂解。展开更多
Chinese East Tianshan is a key area for understanding the Paleozoic accretion of the southern Central Asian Orogenic Belt. A first accretion-collision stage, before the Visean, developed the Eo-Tianshan range, which e...Chinese East Tianshan is a key area for understanding the Paleozoic accretion of the southern Central Asian Orogenic Belt. A first accretion-collision stage, before the Visean, developed the Eo-Tianshan range, which exhibits north-verging structures. The geodynamic evolution included： i） Ordovician-Early Devonian southward subduction of a Central Tianshan ocean beneath a Central Tianshan arc; ii） Devonian oceanic closure and collision between Central Tianshan arc and Iqli-North Tianshan block, along the Central Tianshan Suture Zone; iii） Late Devonian-earliest Carboniferous closure of a South Tianshan back-arc basin, and subsequent Central Tianshan-Tarim active margin colli- sion along the South Tianshan Suture Zone. A second stage involved： i） Late Devonian-Carboniferous south- ward subduction of North Tianshan ocean beneath the Eo-Tianshan active margin （Yili-North Tianshan arc）;展开更多
文摘在南岭花岗岩带中燕山早期的岩浆岩套花岗岩类占绝对优势,以二长花岗岩和钾长花岗岩为主.在岩带的东段赣南和闽西南地区,存在燕山早期的A型花岗岩类（176～178 Ma）和双峰式火山岩（158～179 Ma）组合,在岩带中部湘南地区存在燕山早期的玄武岩类（177～178Ma）.赣南地区的双峰式火山岩组合中酸性端员流纹岩和A型花岗岩类同具有板内花岗质岩石的地球化学特征,基性端员玄武岩为板内拉斑玄武岩,湘南地区的玄武质岩石不仅为板内拉斑玄武岩而且发育有板内碱性玄武岩.鉴此,南岭地区燕山早期的岩浆岩套无疑是一种典型的后造山（Post-orogenic）岩石组合.后造山岩套是后碰撞（Post-collision or Late orogenic）事件结束和泛大陆开始裂解的标志,预示着一个新的造山的威尔逊旋回即将来临.因此可以认为南岭地区燕山早期应是继印支造山运动以后的一种后造山的大陆裂解的地球动力学背景,并非自白圣纪以来才开始裂解。
基金Supported by the National Natural Science Foundation of China (Grant Nos. 40372038 and 40325006) a Special Grant of Oil & Gas Research (Grant No. XQ-2004-07)
文摘Chinese East Tianshan is a key area for understanding the Paleozoic accretion of the southern Central Asian Orogenic Belt. A first accretion-collision stage, before the Visean, developed the Eo-Tianshan range, which exhibits north-verging structures. The geodynamic evolution included： i） Ordovician-Early Devonian southward subduction of a Central Tianshan ocean beneath a Central Tianshan arc; ii） Devonian oceanic closure and collision between Central Tianshan arc and Iqli-North Tianshan block, along the Central Tianshan Suture Zone; iii） Late Devonian-earliest Carboniferous closure of a South Tianshan back-arc basin, and subsequent Central Tianshan-Tarim active margin colli- sion along the South Tianshan Suture Zone. A second stage involved： i） Late Devonian-Carboniferous south- ward subduction of North Tianshan ocean beneath the Eo-Tianshan active margin （Yili-North Tianshan arc）;
