青藏高原班公湖-怒江缝合带丁青-碧土段大地构造演化  

Tectonic evolution of Dingqing-Bitu segment of Bangonghu-Nujiang suture zone in Qinghai-Tibet Plateau, China

作　　者：蒋光武[1,2] 谢尧武 白珍平[3] 西诺朗杰 强巴扎西 彭兴阶 

机构地区：[1]中国科学院广州地球化学研究所,广东广州510640 [2]西藏地质调查院,西藏拉萨850000 [3]西藏自治区国土资源厅信息中心,西藏拉萨850000 [4]云南省第三地质大队,云南大理671000

出　　处：《地质通报》2009年第9期1259-1266,共8页Geological Bulletin of China

基　　金：国家自然科学基金项目(编号:40872146);中国地质调查局项目(编号:1212010510214;1212010813028)资助

摘　　要：藏东班公湖-怒江缝合带丁青-碧土段位于该缝合带由东西向转向南北向的转折部位,夹持于冈瓦纳大陆冈底斯-察隅陆块与泛华夏扬子大陆昌都-思茅陆块之间,经历过强烈伸展、挤压、碰撞、急剧沉降和隆升,是地质构造极其复杂的造山带。其沉积构造环境复杂多样,与该缝合带发展演化有关的岩浆活动极其强烈、频繁,并发育有高压变质带。丁青-碧土-怒江洋盆经历了较为完整的威尔逊旋回,包括裂谷-初始洋盆阶段、洋盆扩张阶段、俯冲消减阶段、封闭碰撞阶段的发展和演化。Dingqing-Bitu segment is located at the turning point where the extension of Bangonghu-Nujiang suture zone turns from EW direction to NS direction, and it is located between Gangdisi-Chaou landmass of Gondwana and Changdu-Simao landmass of Huaxia Yangtze continent thus has experienced strong extension, extrusion, collision, rapid settlement and uplifting, therefore it belongs to orogenic belt with very complicated geological structures and variable depositional tectonic setting. There is a high-pressure metamorphic belt developed and the relative magmatic activities is quite intensive and frequent in this suture zone. Dingqing-Bitu-Nujiang ocean basin has experienced a ratively complete Wilson Cycle that includes the initial development and evolution of rift-initial ocean basin stage, oceanic spreading stage, oceanic subduction stage and closure-collision stage.

关 键 词：青藏高原 班公湖-怒江缝合带 丁青-碧土段 构造演化 

分 类 号：P542.4[天文地球—构造地质学]