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2008GeologyandMineralResourcesofSouthChina3:2008-04-06:.:(1969!),,,.:1007-3701(2008)03-0019-06丰耀东(河南省地矿局第三地质调查队,河南信阳4604000):(),,:-,-;,,:;;;:P588.14:A1-()-(),,-(1),,,NWWEW,,SN,[1]22.1,,2.1.1,,(1):,,:∀,30%;#,50%;∃;%,,1~10cm;&,;∋(2):,(2a)(2b)2a20081-Fig.2BedrockGeologicalMapoftheStructureandFaciesoftheVolcanicRocksintheShangtianti-HuangchengshanAreaoftheNorthernDabieMountains1.;2~3.,;4.,;5~7.,+;8~10.,;11.,;12.,;13.;14.;15.;16.;17.;18.;19.;20.;21.;22.;23.;24.;25.;26.;27.;28.;29.;30.;31.;32.;33.;34.;35.--;36.;37.;38.(3):,,(803:),3a3b3c3a,(),,R.S.J.Sparks,,;3b,;3c,,,();(4):,(),:∀;#,;∃-(),2.1.2,:∀,,,,;#,;∃2a,2a2a,30cm,,;%2b,;&(,),2.2-,,,,(),-,,,()(),(),,1m(,,,SiO2SiO22.3,,,,,(),,,812008,,,(),,,,,,,,,2.4,,:(,),(),,2.5--,-,,(),,()-,3,3.1,,3.2NNW,,,,,NENWW,,,,,,,[2]3.3,,,,823:4-15,,[3]:∀1-()Table1ReviewoftheStratigaraphicDivisionoftheVolcanicRocksintheChenpengFormation(Cycle)oftheShangtianti-HuangchengshanArea832008)#()))∃)%))&)∋,,,,,,,(1):[1].[M].:,1987.[2].[M].:,1989.[3],,,.[M].:,1996.StructureandFaciesoftheVolcanicRocksintheShangtiantiAreaoftheNorthernDabieMountainsFENGYao-dong(No.3GeologicalSurveyTeam,HenanBureauofGeo-explorationandMineralDevelopment,Xinyang,464000,Henan,China)Abstract:Accordingtothesystematicstudyofthedistribution,stratigraphicsequence,structureandfacies,andstructuraldeformationofthevolcanicrocksinthenorthernDabieMountains,itissuggestedthatthepyroclasticrockintheShangtianti-Huangchengshanareaisthecognateejectaofthesecondaryignimbrite.Startedwiththeeruptivefaciesofthevolcanicrocks,thestructureandfaciesofthevolcanicrocksintheShangtianti-Huangchengshanareaisconstructed;Basedonthevolcanicfacies,itisproposedthatthedivisionoftheChenpengformationoftheupperCretaceouscorrespondstothevolcanicrhythmandthedivisionofthevolcaniclayerscorrespondstothefaciessequence.Theabovestudyresultsareemphasizedinthepaper.Keywords:Mesozoicvolcanicrock;structureandfacies;faciespattern;Huangchengshanarea84