从桌子山剖面看贺兰坳拉谷北段奥陶系等深流沉积  

ORDOVICIAN CONTOURITE DEPOSITION ON THE NORTHERN SEGMENT OF THE HELAN AULACOGEN SEEN FROM THE BENCH MT SECTION

作　　者：丁海军[1] 孟祥化[1] 葛铭[1] 薛怀宇[1] 

机构地区：[1]中国地质大学,北京100083

出　　处：《安徽地质》2008年第1期8-15,共8页Geology of Anhui

摘　　要：采用野外观察描述和室内分析相结合的方法,综合分析了贺兰坳拉谷北段桌子山剖面奥陶系各组地层沉积相特征,得到了沉积环境的垂向变化和横向迁移规律。以桌子山剖面奥陶系沉积相研究为基础,结合沉积相模式,识别出了典型的碳酸盐等深流沉积,建立了贺兰坳拉谷北段奥陶系层序地层学模式,从而为验证坳拉谷的存在提供了有力的证据。Based on field observation and description in combination features of each formation of Ordovician strata of the Bench Mt section with indoor analysis, this paper discussed the sedimentary facies across the northern segment of the Helan aulacogen, and found the vertical change and transverse migration laws on sedimentary environments. Typical carbonate contourite was recognized and the Ordovician sequence stratigraphy model for the northern segment of the Helan aulacogen established on the basis of research of the Ordovician sedimentary facies of the Bench Mt section combined with sedimentary facies model. This provided perfect evidence for existence of aulacogen.

关 键 词：桌子山剖面 等深流沉积 沉积相 层序 中奥陶世 

分 类 号：P512.2[天文地球—地质学]