四川龙门山中段泥盆纪层序地层

Devonian sequence stratigraphy of central Longmen Mountains,Sichuan

龙门山中段白石 苟家地区泥盆纪地层十分发育。根据多条剖面的岩石特征、基本层序、生态环境等所反映的相对海平面变化规律 ,将区内以泥盆纪为主的沉积地层划分为九个层序 ,并归之于 4个层序组。详细分析了每个层序各体系域的特征并建立了层序地层格架。区内泥盆系总体为一套向上变浅的沉积层序 ,埃姆斯早期存在深水盆地环境 ,中泥盆世早期盆地呈西深东浅的沉积构造格局。

The Devonian strata are well developed in the Baishi Goujiaregionofcentral Longmen Mountains ,Sichuan .Ninesequences which maybe assignedt of our sequencesets have been distingui shedinthelightofrelativesea levelchangesbasedonlithology ,se quencestratigraphy ,ecology .Theindividualsystemstractsofeachsequencearediscussed indetail,andsequencestratigraphicframeworkofDevoniantoEarlyCarboniferousiscon structedforthestudyarea .TheDevonianstratainthisregiongenerallyexhibitsasucces sionofshallowing upwardsedimentarysequence ,indicatingadeep waterbasinenviron mentduring the early Emsian(EarlyDevonian) ,andstilladeep watersedimentaryenvi Devoronmentinthewestbutashallower watersedimentaryenvironmentintheeastduringthe earlyMiddleDevonian .