寒武纪秦岭古海洋演化  

EVOLUTION OF CAMBRIAN QINLING PALEO-OCEAN

作　　者：杨家 李杰 

机构地区：[1]地球科学学院

出　　处：《地球科学（中国地质大学学报）》1995年第6期612-616,共5页Earth Science-Journal of China University of Geosciences

摘　　要：华北与扬子块体在中元古代拼合成中国古大陆，但自晚震旦世又分离成两大板块，各自有其发展历史，其间以商丹断裂为界，至晚三叠世完成最终对接、拼合，寒武纪时期华北南部陆缘区为活动大陆边缘，扬子北部陆缘区为被动大陆边缘，各自又分成若干隆凹相间的次级构造岩相带。晚寒武世从扬子北部陆缘区分离出中秦岭微板块。据岩相、古生物地理，并参考古地磁资料，再造了寒武纪古大陆及秦岭古海洋面貌。North China and Yangtze terrains were amalgamated into a China paleo-continent in Middle Paleozoic, and the continent was separated into two plates in Late Sinian, with Sangdan fault as their boundary.They developed with their own history and were eventually converged and amalgamated together in Late Triassic. In Cambrian the southem continental margin of North China was the active continental margin, while the northern continental margin of Yangtze was the passive one. Each of them was divided into seveal secondary structural lithofacies belts in the form of altemation of upwarpings and downwarpings. However, in Late Cambrian the upwelling area in Central Qinling was separated from the northern continental margin of Yangtze and into Central Qinling microplate. The paleo-continent and Qinling paleo-ocean were reconstructed based on lithofacies and paleobiogeography in reference with paleomagnetic data.

关 键 词：寒武纪 古海洋演化 秦岭 

分 类 号：P736.22[天文地球—海洋地质] P534.41[天文地球—海洋科学]