东北地区早二叠世岩相古地理研究

Lithofacies Palaeogeography of Early Permian in Northeast China

利用野外地质剖面、关键钻井剖面和区域地质资料,在地层划分对比和构造格局研究基础上,运用沉积相分析的方法,探讨了东北地区早二叠世岩相古地理特征,将早二叠世分为阿瑟尔期-亚丁斯克期、空谷期两个编图单元进行岩相古地理编图,恢复了东北地区早二叠世的岩相古地理面貌。研究表明,早二叠世东北地区主要发育半深海沉积体系、浅海陆棚沉积体系、碳酸盐台地沉积体系、无障壁海岸沉积体系、障壁海岸沉积体系及河流沉积体系;阿瑟尔期-亚丁斯克期存在漠河古陆、松辽古陆、佳木斯古陆及华北北缘高地四个古陆,物源区碎屑物质供应充分,研究区为浅海、海陆交互及河流沉积区,周边古陆的格局;至空谷期,松辽古陆消失,研究区为浅海-半深海沉积,周边古陆的格局。

Based on the study of stratigrapbic division,correlation and structural pattern, field data of the measure ment strata sections, privotal drilling profile and the existing regional geological data were used to make the sedimen- tary facies analysis. The Early Permian tectonic lithofacies paleogeography in northeast China was analysed systematically and the lithofacies paleogeographic maps of Asselian-Artinskian and Kungurian of Early Permian were produced. The study shows that the sedimentary systems include bathyal sedimentary system,neritic shelf sedimentary system, car bonate plat form sedimentary system,no barrier coast sedimentary system,barrier coast sedimentary system and river sedimentary system in northeast China during the Early Permian; in Asselian-Artinskian,the old lands were Mohe, Songliao,Jiamusi and the highlands of northern margin of north China with rich material source; the discussed area has developed the depositional pattern of shallow sea, the transitional zone between land and ocean,and the river are- as surrounded by ancient land; in Kungurian,the old lands of Mohe,Jiamusi and the highlands of northern margin of north China still exist with a pattern of shallow bathyal deposition surrounded by ancient land.