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1、第13卷第6期地学前缘(中国地质大学(北京);北京大学)Vol.13No.62006年11月EarthScienceFrontiers(ChinaUniversityofGeosciences,Beijing;PekingUniversity)Nov.2006陕西镇安西口石炭系—二叠系界线剖面综合地层学研究11213王训练,王雷,张海军,张世红,夏国英11中国地质大学(北京)地球科学与资源学院,北京10008321中国科学院青藏高原研究所,北京10008531天津地质矿产研究所,天津30017011213WANGXun2
2、lian,WANGLei,ZHANGHai2jun,ZHANGShi2hong,XIAGuo2ying11SchoolofEarthSciencesandResources,ChinaUniversityofGeosciences,Beijing100083,China21InstituteofTibetanPlateauResearch,ChineseAcademyofSciences,Beijing100085,China31TianjinInstituteofGeologyandMineralResources,T
3、ianjin300170,ChinaWANGXun2lian,WANGLei,ZHANGHai2jun,etal1IntegratedstratigraphyoftheCarboniferous2PermianboundarysectionatXikou,ZhenpanCounty,ShaanxiProvince,NorthwestChina1EarthScienceFrontiers,2006,13(6):2912302Abstract:Anintegratedstudyhasbeencarriedoutonbiost
4、ratigraphy,sequencestratigraphy,rockmagneticstratigraphy,andeventstratigraphyoftheCarboniferous2PermianboundarysectionatXikou,ZhenpanCoun2ty,ShaanxiProvince,whichrepresentsatypicalsectionofmarinedepositsinChina1FourconodontbiozoneswereestablishedaroundtheCarbonif
5、erous2Permianboundary1InascendingordertheyareStreptognathodusel2egantulusZone,S1elongatusZone,S1gracilisZone,andS1isolatusZone1ConsequentlytheCarboniferous2PermianboundaryissetatthebaseoftheS1isolatusZonedefinedbythefirstappearanceofS1isolatus,whichis313mlowertha
6、ntheboundarydefinedbythebaseoffusulinidassemblageofPseudofusulinakrotowispha2eroidea2DunbarinellaZone1Twelve4th2ordersequences,approximatelycorrespondingtotheparasequencesets,arerecognizedinthedepositsrangingfromtheUpperCarboniferousXiaoyaopantotheLowerPermianLon
7、glinian,whichconstitute53rd2ordersequenceswhoseboundariesarethefirstfloodingsurfaces1Inade2tailedbiostratigraphicframework,thesedepositionalsequencesareonthewholewellcorrelatedwiththoserec2ognizedinthesynchronousdepositsinsouthernGuizhou1ExceptforthebaseofXiayang
8、jiahepan,allbasesofthestages,includingthebasesofXiaoyaopan,Shangyangjiahepan,Fanjiahepan,Yakoupan,andLonglinian,arelocatedeitheronthekeysurfacesofthesequencesa
