摘要
以湖南马底驿地区１∶５万区调和专题研究资料为基础，指出板溪群岩石（包括其下伏的冷家溪群）不是构造混杂岩，而是前震旦系正常的地层序列；江南古陆最终形成于加里东运动，晚古生代沉积受古陆控制；华南具有双层基底，在浅变质褶皱基底之下有深度变质结晶基底，在整个江南古陆没有巨大外来体的明显证据，并得到地球物理资料的支持。
Currently the tectonic nature of Jiangnan Ancient Land is one of the actively researched topics in China.This paper is an attempt to summarize the main structural and stratigraphic features of the Banxi Group exposed in the Xuefengshan area on the basis of regional geological observations and recent mapping of 1∶50 000 in Madiyi region,Hunan Province.The data indicate that the Banxi Group rocks,including the underlying Lengjiaxi Group ones,are not tectonic melanges,but normal pre Sinian stratigraphic sequence.Jiangnan Ancient Land formed during the Caledonian orogeny is,tectonically,an major anticlinorium located between the Yangtze block and the South China orogen.The Late Paleozoic sedimentary sequence was controlled by the ancient land.There is no evidence of huge allochthons within the entire Jiangnan Ancient Land thus far.There are twofold bases in South China with the deep metamorphic crystalline base under the epimetamorphic fold base,which are supported by geophysical data.
出处
《地质科技情报》
EI
CAS
CSCD
北大核心
1998年第3期1-6,共6页
Geological Science and Technology Information
基金
地矿部1:5万四都坪幅
马底驿幅区调项目
关键词
板溪群
江南古陆
混杂岩
构造属性
Banxi Group,Jiangnan Ancient Land,melange,tectonic nature,allochthon
