摘要
华北地区二叠系砂岩的岩性特征和碎屑成分具有明显的分区性，以阳泉－邯郸－徐州一线为界可划分出南、北两大区域。总观全局，粒度北粗南细，结构成熟度由北向南增高；但在矿物成分成熟度上出现局部的逆向作用，即向南成熟度降低．表明在总的物源来自北部的阴山古陆时还有局部新的物源，其南缘的秦岭－大别山则可能是物源补充的来源地，物源区性质均属再旋口造山带。
North China represents a vast area bounded on the north by Yinshan Oldland, the south by Qinling--Dabie mountain, the east by Tanlu fault and the west by Luliang mountain. The authors deal with the elastic components of sandstones from 33 outcrop sections and drill sections of Permian in North China. Depending on lithology and fabric components, the authors discussed the distributed trend and law of sandstones elastic components in Permian(Shanxi Formation, Upper and Lower Shihezi Formation). The cluster analysis of multiple statistics with computer classified the elastic components of sandstones into several types and revealed, geographically, good composition zonation. Hebei and Shandong Provinces were belong to a region. Shanxi, Henan and Anhui Provinces were another region. This feature of distribution was controlled by provenance and depositional system. Its provenance was dominated by Yinshan Oldland, and Qinling--Dabie mountain also had a little supply of elastics. The nature of provenances are recycled orogenic belt.
出处
《现代地质》
CAS
CSCD
1994年第3期299-307,共9页
Geoscience
关键词
砂岩
成分
二叠纪
构造背景
orth China, Permian, sandstones elastic components, cluster analysis,provenance, recycled orogenic belt
