沉积学报2011，Vol.29Issue(5)：876-888,13.
河南省太原组沉积时期岩相古地理特征
Characteristics of Lithofacies Paleogeography of the Taiyuan Formation Sedimentary Period,Henan Province
摘要
Abstract
The sedimentary area of the Early Permian Taiyuan Formation in Henan Province is located in the south ofnorth China basin and to the north of Luanchuan-Gushi deep fault in the North Qingling fold belt,at that time,thissedimentary basin was controlled by the tectono-paleogeographic features of the west uplift in the North China platformblock.The Taiyuan Formation was a part of deposits of the North-China epicontinental sea or carbonate platform in the Late Paleozoic,and developed a set of deposits of the epicontinental sea characterized by the carbonate rocks intercalated some clastic rocks and coal.This section is mainly composed of gray,dark gray,thin-medium bedded bioclasticlimestones,intercalated with thin-medium bedded mudstone,micritic limestone,fine sandstone,siltstones and thincoals,locally appeared light gray thick beded moderate-fine grained sandstone,coarse sandstone or gray-white quartzsandstone,with very abundant body fossils,such as fusulinids,conodonts,brachiopods,corals,crinoids,bivalves andplants fossils and so on.According to the analysis of sedimentary sequence,the Taiyuan Formation can be divided in-to three units from bottom to top： the lower limestone unit,mainly containing 4 ～ 5 limestone layers;the middleclastic unit,dominated by sandstone and mudstone,intercalated with 1 ～ 3 layers of limestone,unstable bioclastic mi-crocrystalline limestone;the upper limestone unit,composed of 2 ～ 3 layers of limestone,locally,4 ～ 5 layers.Based on the isoline trend analysis including the thickness of the formation and carbonate rock and the ratio of sand tomudstone,along with the composition and distribution features of ichnofossils,facies fossils and sedimentary assem-blage types,5 sedimentary facies（tidal-flat,lagoon,barrier island or sand bar,restricted carbonate platform andopen carbonate platform facies）,12 kinds of sedimentary types,3 sedimentary assemblage types and 3 types of litho-facies areas as the micritic limestone and mudstone lithofacies area of restricted flatform-tidal flat setting,limestoneand clastic lithofacies area of open platform-tidal-lagoon setting and limestone and clastic lithofacies area of open plat-form-barrier island-tidal flat setting can be suggested.The Lithofacies palaeogeographic characteristics of Henan province during the deposit of the Taiyuan Formation display：（1） The marine invasion is widespread and limestone ofshallow sea facies is almost throughout the whole sedimentary region;（2） Sealine extended eastward and southward toLingbao-Luoning-Songxian-Fangcheng-Biyang zone;（3） Old land areas are situated the Funiu mountain to sorthwest ofthis basin and Zhongtiao Mountain to west of this basin;（4） Paleotopography shows steep in the west,gentle in theeast,high relief in the northwest,and low relief in the southeast;（5） The sedimentary zone of largest thickness of thisformation is in the northeast and east of this basin;（6） Seawater invasion was from the east and northeast,and regres-sion from northwest to southeast.In the Taiyuan Formation sedimentary period,the basement terrain of this sedimentary basin was relatively gentle and sea water was frequently progressive and regressive,thereby,the interbeds of carbonate rocks of the restricted epicontinental sedimentary environment and coal-bearing clastic rock of tidal flat sedimentary setting were generated,and the larger area peat flat were developed in the coastal plain in Henan Province,and the coal layers with industrial value were formed in many parts.关键词
沉积相/岩相古地理/太原组/早二叠世/河南省Key words
sedimentary facies/lithofacies paleogeography/the Taiyuan Formation/the Early Permian/Henan province分类
天文与地球科学引用本文复制引用
宋慧波,胡斌,张璐,刘顺喜,牛永斌..河南省太原组沉积时期岩相古地理特征[J].沉积学报,2011,29(5):876-888,13.基金项目
国家自然科学基金项目 （）
国家高校博士点专项基金 （）
河南省科技计划项目 （）
河南省生物遗迹与成矿过程重点实验室开放基金（编号：OTMP0904）资助 （）
