论东吴运动构造事件与二叠系分统界线问题

On the event of Dongwu Movement and its relation with Permian subdivision

根据华南二叠系海水进退、沉积旋回、岩相变化、生物变革及火山活动等事件研究，东吴运动是存在的，位于翠屏山组与童子岩组、龙潭组与堰桥组、吴家坪组与茅口组之间，以假整合、整合或不整合而显现其不平衡性。它是属一种以升降为主振荡性质的地壳运动，并可与新疆北山运动和欧洲萨尔运动相对比。东吴运动所造成的这一事件界线是由早二叠世海退线和晚二叠世海进线重合而成，前者是穿时的，后者则是近等时的。因此，以其作为二叠系分统的界线，应是一条比较理想的自然界线。

Based on the studies of Permian transgressions and regressions, sedimentary cycles, volcanic activities and changes in biota and lithofacies, the author concluded that the Dongwu Movement existed and occurred between the Maokou and Wujiaping Formations, the Yanqiao and Longtan Formations and also between the Tonziyan and Chuipingshan Formations. Its development was unbalanced as conformity, pseudo-conformity and disconformity appeared together. It was one of crustal movements with uplifting-downgoing as its main vibration. The boundary marked by that event has been shown by the interface between the Early Permian regressions and Late Permian transgressions. The former is diachronous and the latter nearly isochronal. So it is an idral natural boundry for the Permian subdivision.