中昆仑北部古生代构造岩浆作用及其演化

对地质研究较薄弱的中昆仑北部开展了古生代构造地层格局、构造变形及构造样式、古生代花岗岩区域分布及其地球化学特征、祁漫塔格群火山岩地球化学及其区域对比等研究，认为祁漫塔格群属寒武－早志留世，早古生代祁漫塔格地区可能不存在成熟大洋，而是以大陆裂谷或初始洋盆为特征；早古生代晚期祁漫塔格山北部被动大陆边缘转化为活动大陆边缘，沿鸭子泉－祁漫塔格主脊断裂汇聚闭合；晚古生代，早期以求勉雷克花岗穹隆为核心南北简单剪切滑覆；晚期沿昆中俯冲碰撞，昆中断裂以北地区转化为活动大陆边缘，古特提斯洋闭合。

Paleozoic Tectonomagmatism in the Northern Central Kunlun Mountains and Its Evolution

The authors have undertaken researches on the Paleozoic tectostratigraphic framework, tectonic deformation and styles, regional distribution and geochemistry of Paleozoic granite and volcanic rock geochemistry of the Qimantag Group and its regional correlation in the northern Central Kunlun Mountains where limited the geological researches were performed. It is considered that the Qimantag Group is of Cambrian-Early Silurian age and that a continental rift or an initial ocean basin rather than a mature ocean possibly existed in the Qimantag area of the northern Central-Kunlun area during the Early Paleozoic. The Qimantag initial ocean closed along the Yaziquan_Qimantag fault and the passive continental margin in the northern part of the Qimantag became the active continental margin during the late Early Paleozoic.The simple shear slide occurred at the north and south flanks of the Qiumianleike granite dome during the earty Late Paleozoic. During the late Late Paleozoic,the Paleo_Tethys Ocean was subducted and collided along the Central Kunlun,and then there appearred the active continental margin in the area north of the Central Kunlun fault. Thus the ocean closed.