民和盆地的构造分析

STRUCTURAL ANALYSIS OF MINHE BASIN

曹守连

Cao Shoulian

民和盆地发育在中祁连隆起带上,基底为元古界、下古生界,盖层为侏罗系至第四系。盆地的基底构造以NW向为主;燕山期构造的展布方向有4种,其中NW,EW或近EW向及NS或近NS向占主要地位。多方向的构造叠加增加了构造的复杂性,喜山期构造主要发育在巴州凹陷和周家台低隆起内,继承了NW向展布的特点。多期构造的叠加和复合形成了民和盆地呈NW向切段,NE和NS向分块的构造格局。

Minhe Basin is situated on central Qilian uplift belt. The basement of the basin includes the Proterozoic and Lower Paleozoic,the caprooks are Jurassic, Cretaceous, Tertiary and Quaternary. The basal structures are primarily in NW direction. The structures formed in Yenshan movement are mainly distributed in NW, EW, nearly EW, NS and nearly NS directions; the superimposition of milti directional structures has made them more complicated. The structures formed in Himalayan movement are predominantly distributed in NW direction within Bazhou Depression and Zhoujiatai uplipt . Multi stage superimposition and composition of the structures resulted in netted tectonic framework of the basin.

10.11743/ogg19970213