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.
出处
《地质通报》
CAS
CSCD
北大核心
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
关键词
青藏高原
班公湖-怒江缝合带
丁青-碧土段
构造演化
Qinghai-Tibet Plateau
Dingqing-Bitu segment of Bangonghu-Nujiang suture zone
tectonic evolution
