南京大学学报（自然科学版）2013，Vol.49Issue(3)：343-355,13.
湖北兴山峡口中下三叠统岩石学-沉积环境分析
Petrology and sedimentary environments of the Lower and Middle Triassic of the Xiakou section in Xingshan County,Hubei Province
摘要
Abstract
The Xiakou section in Xingshan County of Hubei Province,with the well developed Lower and Middle Triassic,abundant in fossils and reliable sedimentary indicators with favorable exposure,is ideal for the study of marine strata in the Upper Yangtze area.According to the stratigraphic division and correlation,the Lower Triassic was divided into the Daye and Jialingjiang Formations,and the Middle Triassic comprised the Badong Formation,with a thickness of 1217.67 m.Limestones dominated the Lower and Middle Triassic,followed by dolomite rocks,and a few karst breccia and clastic rocks were developed in this area.Limestones could be further divided into micritic limestones,vermicular limestones,gravelelast limestones,sandclast limestones,bioclastic limestones and shaly limestones,and dolomite rocks comprised of mierocrystalline-fine crystalline dolomite and particulate dolomite.Based on the comprehensive analyses of lithology,palaeontology and sedimentary structures,five types of sedimentary environment of the Early and Middle Triassic were generally developed in turn,such as open shelf facies,slope facies,open platform facies,restricted platform facies and tidal flat facies,with shoal developed in the open platform.There was a transgression event at Daye Period of the Early Triassic with the sedimentary environment of open platform facies-slope facies,however,the Jialingjiang Formation included four transgressiveregressive cycles with sedimentary environments of open platform facies-restricted platform facies-tidal flat facies.The sedimentary environment of Badong Period of the Middle Triassic was mainly domained by the restricted platform facies.The preliminary analysis shows that the conditions of hydrocarbon source rocks and reservoir rocks of the Lower and Middle Triassic in the study area are rather favorable.关键词
湖北/峡口剖面/中、下三叠统/岩石特征/沉积环境Key words
Hubei province/ Xiakou section/ Lower and Middle Triassic/ petrological characteristics/ sedimentary environment引用本文复制引用
张震,鲍志东,胡广成..湖北兴山峡口中下三叠统岩石学-沉积环境分析[J].南京大学学报（自然科学版）,2013,49(3):343-355,13.基金项目
中国石化海相前瞻性项目"中国南方海相地层定量岩相古地理研究及油气预测"(C-0800-06-ZS-349) （C-0800-06-ZS-349）
