论文部分内容阅读
本文論述了长江以南苏皖南部地区各时代旋迴建造的性貭和类型。仅出露於南带的呂梁旋迴的建造序列具有优地槽性貭。是一套火山——陆源碎屑建造。中带在加里东旋迴中形成了一套冒地槽型建造序列,它主要是继承性地发育在呂梁旋迴的建造之上。这时,南带的相应建造发育很不完全,厚度很小,性貭变为稳定。北带的建造序列較南带完全,但較中带,則其碎屑比減少,缺失复理石等地槽型成員。海西旋迴早期,从晚泥盆世到晚石炭世,在全区所形成建造性貭和类型具有明显的稳定性,其中尤以在中带和南带者为甚。从早二叠世开始直到燕山旋迴止,在北带形成了几个代表活动性較强的建造序列,而南带和中带則 继續很稳定。根据建造在时間上及空間上的上述分異現象,笔者认为南带是呂梁时期的优地槽;中带是加里东时期的冒地槽;北带是位於华北地台南缘与地槽的交接部分,是长期继承发展的沉陷带,属于为E.B.巴甫洛夫斯基所首次描述过的台缘沉陷带的范疇,是古地台与地槽交接的一种形式。
This article discusses the nature and types of gyrations built in various periods in the southern part of Jiangsu and southern Anhui Province. The sequence of the Luliang cycle, exposed only in the southern zone, has excellent trough properties. Is a volcano - terrestrial debris construction. The Middle Belt formed a set of run-up trough-type structures in the Caledonian cycle. It was mainly developed inherited from the Lvliang cycle. At this time, the corresponding construction of the southern belt is not fully developed, the thickness is small, the sex 貭 becomes stable. The North Belt was built more completely than the South Belt. However, compared with the Middle Belt, the debris ratio was reduced and the trough members such as the Polygons were absent. In the early Hercynian cycle, from the Late Devonian to the Late Carboniferous, the constructive ridges and types formed in the whole area had obvious stability, especially in the middle and southern areas. From the Early Permian up to the Yanshanian rotation, several strong construction sequences were formed in the northern zone, while the southern and middle belts continued to be very stable. According to the above-mentioned differences in time and space constructed, the author thinks that the southern belt is the best groove in the Luliang period, the middle belt is the caledonian groove in the Caledonian period, and the northern belt is located on the southern margin of the North China platform and the trough The transfer part is a subsidence belt inherited and developed for a long time. It falls into the category of the subsidence belt of the margin first described by EB Pavlovsky and is a form of handover between the ancient platform and the earth groove.