摘要
塔里木盆地新元古代构造演化对显生宙成盆成烃作用研究具重要意义。通过锆石年代学研究结合新的钻探与地震资料进行构造解析,结果发现:1塔里木盆地内部发育峰值约770 Ma的与超大陆裂解相关的强伸展构造活动,南华纪可能存在一系列近EW向展布的不连续断陷系统;2震旦纪晚期存在与"泛非运动"相关的广泛抬升剥蚀,与寒武纪存在大型的区域不整合,南北分带的构造体制不同。综合分析表明,塔里木盆地新元古代经历南华纪大陆裂谷-断陷期、震旦纪坳陷-挤压抬升期等4期构造演变,发育完整的强伸展-挤压构造旋回;新元古代具与显生宙显著不同的构造演化特征,震旦—寒武系间存在大规模构造-沉积间断。
Based on the analysis of chronology data,drilling and seismic data,it is showed that the tectonic characteristics is totally different from that of Cambrian in Tarim basin. There is strong intraplate extension activity and magmatism with the peak ~770 Ma,the same tectonothermal events as the breakup of the Rodinia supercontinent in Nanhua Period,which resulted in a serial of E-W trend discontinuous rift system in Tarim craton.In the end of Sinian Period,there is farranging uplift and denudation related to Pan-African orogenic with a large regional unconformity,which caused the northsouth zonation tectonic regime different with the east-west zonation in Cambrian.It undergone 4 stages evolution in Neoproterozoic with the rifting stage- the faulting depression stage in Nanhua Period,the depression stage and compression uplift stage in Sinian Period,indicated an integrated intense extension-compression tectonic cycle.It is demonstrated that the tectonic evolution in Neoproterozoic is much different from that in Phanerozoic with large- scale unconformity between them.
出处
《新疆地质》
CAS
CSCD
2015年第3期335-339,共5页
Xinjiang Geology
关键词
前寒武纪
构造-热事件
超大陆
不整合
演化
Pre Cambrian
Tectono-thermal events
Supercontinent
Unconformity
Evolution
