摘要
本文在较为详细地研究各种沉积标志的基础上,对区内太原组地层的沉积环境进行分析,初步认为:本区太原组地层是发育在晚石炭世华北陆表海边缘的一套以潮坪、三角洲为主体的含煤沉积,主要由陆源碎屑潮坪、高建设性朵状三角洲、高破坏性潮控三角洲及潮下低能带的碳酸盐沉积所组成.
The Pingxi mining district is located in the eastern part of shanxi province and in the northeastern margin of Qinshue Field. It is a large one which is being built, its area is about 336.5km2. The age of the coalbearing formation is Permo- Carboniferous.This paper probes into the sedimentary environment of Taiyuan Formation in this area.
Taiyuan Formation is one of the main coal-bearing formations in this area , which mainly consists of grey and dark-grey limestones, argillites, sandy-argillites, siltites; light-grey and grey-yellow sandstones and coal seams, being about 120 mthick. By the analysis of vertical sequence, Hthologic characteristics , sedimentary structure feature of grain size distribution, trace elements , fossils, sand-body geometry shape and paleocurrent , Taiyuan Formation in this area is considered to be a set of the coal-bearing deposits represented by thd deltas , tidal flat and subtidal carbonate sediments , which occurred in the margin of Hua-bei Epicontinental Sea during the Late Carboniferous.
The lower part of Taiyuan Formation is represented by sediments of a tidal system , while the middle and upper part of Taiyuan Formation are composed of sdeiments of the deltaic system . Two basic kinds of deltas have been recognized in this area , namely , high-construction lobate delta and high-destructive tide-dominated delta.
There are three limestone seams in Taiyuan Formation , namely 'Sijieshi' 'Qianshi', and 'Houshi' limestones , which are much like in lithologic characteristics and consist mainly of bioclastic micrites . The analysis of paleoenvironments shows that these limestones in this area are carbonate sediments formed in the subtidal low-energy zone.
出处
《沉积学报》
CAS
CSCD
北大核心
1989年第2期71-78,共8页
Acta Sedimentologica Sinica
