华北和华南块体古生代至中生代古地磁极移曲线与古纬度的分布变化

Revised and Synthetic Apparent Polar Wander Paths of The North and South China Blocks From the Cambrian to Cretaceous

本文是对近年来国内外学者,对华北和华南块体古地磁研究工作的初步总结分析,和对笔者1990年古地磁极移曲线编制工作的补充和修正。在收集整理关于华北和华南块体古生代至中生代古地磁研究成果的基石出上,结合笔者的新成果,按照一定的规则选取部分数据,经统计分析计算,得到两大块体的古地磁极移曲线和古纬度分布变化,据此推导出两大块体的运动形式和北向运动的速率及规模,指出两块体拼合的时限。

The available palcimagnetic data for the North and South China Blocks (NCB and SCB) published in the past decade have been revised and the list of poles for the NCB and SCB selected with criteria generally accepted was presented in an earlier paper (Wu et al., 1990). The data are reviewed in this paper with an emphasis on evidence of rcmagnctization and more stringent selection criteria, involving the data update, and the revised APW paths and paleolatitude distributions for the NCB and SCB are derived by averaging all the selected data at certain time window and transferring the data to a reference point respectively. We believe that these APW paths and paleolatitude distributions reveal clearly key features of the displacements and rotations of the NCB and SCB, and, on the basis of analyzing and describing the features of the revised and synthetic APW paths and paleolatitude distributions we discussed the motion history of the NCB and SCB in Paleozoic and Mesozoic with the geological evidence.