1、第32卷第7期2013年7月地質通報GEOLOGICALBULLETINOFCHINAVol.32,No.7July.,2013TheHuohuasection:anewDevonian-Carboniferousboundarysectionofdeep-waterfaciesinZiyunCounty,GuizhouProvince,China一條新發(fā)現(xiàn)的深水相泥盆系一石炭系界線剖面：中國貴州紫云火花剖面WANGXu-ri,JIQiang王旭日，季強InstituteofGeology,ChineseAcademyofGeologicalSciences,26BaiwanzhuangRoa

2、d,Beijing100037,China中國地質科學院地質研究所，北京100037WangXR,JiQ.TheHuohuasection:anewDevonian-Carboniferousboundarysectionofdeep-waterfaciesinZiyunCounty,GuizhouProvince,China.GeologicalBulletinofCAi/wr,201342(7):977-987Abstract:ThispaperintroducesanewsectionoftheDevonian-CarboniferousboundaryinHuohuaarea.Ziyu

3、nCounty,GuizhouProvince,SouthChina.TheHuohuasectionofUpperDevonianandLowerCarboniferousiswell-outcroppedalonganewcountrysideroad.Inthissection,theD-Cboundarybedscanbegroupedintothreelitho-units:theDaihuaFormation,theChangshunShaleandtheWangyouFormation”,fromwhichmorethan30conodontsampleswerecollecte

4、dandprocessed.Accordingtoourcurrentstudy,someimportantconodontsintheDaihuaFormationandtheChangshunShalehavebeenrecognized,suchasPalmaiolepistenuipunctala.Pa.glabra,Pa.marginifera.Pagracilis,PolygnathusvogesiandPolygnathuspuruspurus.AfewconodontshavebeenfoundfromtheWangyouFormation,suchasPolygnathusc

5、ommunisandHindeodellasubtilis.BasedonthecomparisonwiththeMuhuasectioninChangshuncountyandtheHasselbachcalsectioninGermanyinEthology,sedimentologyandconodontbiostratigraphy,theD-CboundarycouldbetemporarilyplacedbetweenBed25andBed26,namelybetweentheChangshunShaleandtheWangyouFormation.Keywords:Devonia

6、n-Carboniferousboundary;conodontbiostratigraphy;Ziyun;Guizhou摘要：在責州省紫云縣火花鄉(xiāng)新發(fā)現(xiàn)一條泥盆系一石炭系界線割面。火花制血位于新修的鄉(xiāng)村公路邊上，出寄有連續(xù)的上泥盆統(tǒng)代化組、長順頁巖和下石炭統(tǒng)王佑組c為了研究泥盆系一石炭系界經，對該副面進行了實測，并采集、分析了30多個牙形刺樣品。根據分析結果，在代化組和長順頁宕中識別出一些牙形刺，如Palnuitolepislenuipunclata,Pa.glabra,Pa.marginifera,Pa.gracilis,Polygnathusvogesi和Polygnathuspurus

7、purus0王佑組中的牙形剌校少，如Polygnathuscommunis和Hindeodellasubtilis等，目前尚不具有建立生物地層單位的條件。根據與長順睦化副面和德國Hasselbachtal刮面巖性、沉積特征和牙形剌生物地屢的對比，暫將火花割面的泥盆系一石炭系界線放置于25層與26屢之間，即長順頁巖與王佑組之間。關鍵詞：泥盆系一石炭系界線；牙形利生物地層；紫云；貴州中圖分類號：P534.44;P534.45;P539文獻標志碼：A文章編號：1671-2552(2013)07-0977-11ReceivedonDecember5,2012;acceptedonMay21,2013;

8、PublishedonJuly15,2013ThisworkwassupportedbytheChineseGeologicalSurvey(GrantNo.1212010911068)andtheInscituceofGeology,ChineseAcademyofGeologicalSciences(GrantNo.J1206).Author：WANGXu-ri(1979-),male,assistantresearcher,beinginterestedinthestudyonpaleontologyandstratigraphy.E-mail:wangl98109圖版IPlaceIEx

9、planationofPlateTheillustratedspecimensareallcollectedfromtheHuohuasection.AllofthemarchousedintheInstituteofGeology,ChineseAcademyofGeologicalSciences.1.PalmatolepisglaltraglabraUlrich&Bassler.1926OralviewofZYHH-C08-1,intheupperpartoftheDaihuaFormation.2S.PalmatolepisglabrapectitudaZiegler,1962

10、2.OralviewofZYHH-C04-A-l,inthelowerpartoftheDaihuaFormation.3.OralviewofZYHH-C04-A-2,inlowerpartoftheDaihuaFormation.4,OralviewofZYHH-C04-A-3,inlowerpartoftheDaihuaFormation.5.OralviewofZYHH-C07-B-1,inupperpartoftheDaihuaFormation.b.PalmaiolepugracilisgracilisBranson&Mehl.1934OralviewofZYHH-C10-

11、B-1,intheupperpartFormation.oftheDaihua7-4.PalmatolepisgracilissigmoidalisZiegler,19627.OralviewofZYHH-C07-A-l,intheupperpartFormation.oftheDaihua8.OralviewofZYHH-C07-A-2,intheupperpartFomution.oftheDaihua9.OralviewofZYHH-C08-2,intheupperpartoftheDaihuaFormation.lO.OralviewofZYHH-C08-3,intheupperpar

12、toftheDaihuaFor-mation.11.OralviewofZYHH-C10-B-2,intheupperpartoftheDaihuaFormation.12.OralviewofZYHH-C12-1,intheupperpartoftheDaihuaFormation.13.OralviewofZYHH-C14-C-1,intheupperpartoftheDaihuaFormation.14.OralviewofZYHHCl4-C2,intheupperpartoftheDaihuaFormation.15-16.Palmatolepi$marginiferamarginif

13、araHelms,195915.OralviewofZYHHC07-A3,intheupperpartoftheDaihuaFormation.16.OralviewofZYHH-C07-A-4,intheupperpartoftheDaihuaFormation.178.PalmaiolepisquadrantinodosainflexoideaMuller,195617.OralviewofZYHH-C07-B-2,intheupperpartoftheDaihuaFormation.18.OralviewofZYHH-C07-B-3,intheupperpartoftheDaihuaFo

14、rmation.X.PalmalolepistenuipunctataSanncnunn,1955OralviewofZYHH-C01-1,inthebasalpartoftheDaihuaFormation.20-24.Polygnathusglaberglal/erUlrich&Bassler,192620.1atcralviewofZYHHC04A4,inthelowerpartoftheDaihuaFormation.21.lateralviewofZYHH-C07-B-4,intheupperpartoftheDaihuaFomurion.22.lateralviewofZY

15、HH-C08-4,intheupperpanoftheDaihuaFormation.23.lateralviewofZYHH-C10-B-3,intheupperpartoftheDaihuaFormation.24.OralviewofZYHH-CIO-B-4,intheupperpartoftheDaihuaFormation.25. PolygnathusvogesiZiegler,1962OralviewofZYHH-C13-1,intheupperpartoftheDaihuaFormation.26. PolygnathuspuruspurusVoges,1959Oralview

16、ofZYHHC15-B-1,inthelowerpartoftheChang-shunShale.27. PalmutolepisglabraprimaZiegler&Huddle,1969,morphotype1,Sandberg&Ziegler,1973OralviewofZYHH-C04-A5,inthelowerpartoftheDaihuaFormation.Fig.lSketchmapshowingthelocationofthestudiedsectioninZiyunCounty.GuizhouProvince,SouthChina978TheUpperDevo

17、nianiswidelyandcontinuouslydistributedinSouthGuizhou,withabundant,variedfossilgroupsandhaveattractedmuchattentionofgeologistsandpaleontologistssince1960s叫.EspeciallysincethedefinitionofDevonian-CarboniferousboundarywasrecommendedbytheInternationalWorkingGroupofDevonian-CarboniferousBoundaryin1979,mo

18、reinvestigationshavebeencarriedoutinSouthGuizhou'".ThoseresearcherscontributedlotsofeffortinsearchingforanexcellentsectionaccordanttotheDCBdefinition.Throughtheirhardwork,theMuhuasectionandtheDapoushangsectionhavebeenrecommendedasthecandidatesectionsoftheDevonian-CarboniferousBoundaryforthe

19、GlobalStratotypeSectionandPoint(GSSP)州.In1989,theLaSerresection(MontagneNoire,France)wasfinallychosenastheGSSPofDCB,andtheDCboundaryisplacedatthebaseofBed89intheLaSerresection1"1.However,someresearchers112"remarkedthattheLaSerresectionwasnotinaccordwiththerulesfordefinitionoftheDCB.Recents

20、tudiesontheLaSerresectionhavealsoevidencedtheproblems114IS|,andtheLaSerresectioncannotdisplaythephylogeneticlineagefromSiphonodellapraesulcalatoS.sulcala.2013年Thus,InternationalTaskGrouponDevonian-CarboniferousBoundarywasestablishedbybothSub-conimissiononDevonianStratigraphy(SDS)andSubcomniissiononC

21、arboniferousStratigraphy(SCS)duringthe33rdInternationalGeologicalConferencein2008.TheGSSPfortheDCBiseagerlyneededtoberestudiednow.ThetaskgrouphadpaidmuchattentiontothesectionsinsoutheniGuizhoubecauseoftheachievementobtainedin1980s,andsomemembersofSCShadvisitedtheDapoushangsectionofDevonian-Carbonife

22、rousBoundaryin2010.DuringfieldinvestigationinZiyunCountyin2(X)9,acontinuoussectionofDevonianandCarboniferousboundarybedswasfoundalonganewlybuiltcountrysideroadfromtheSongshanTowntotheHuohuavillage,about15kn】southwestoftheSongshanTown(N25。40'56"、E106。06'。4”,H1032m)(Fig.1).Accordingtofiel

23、dwork,threelitho-unitscanberecognizedinascendingordertheDaihuaFonnation,theChangshunShaleandthe"WangyouFonnation"(Fig.2),andmorethan30conodontsampleshavebeencollectedandprocessed.TheaimofthispaperistointroducetheHuohuasectionandourcurrentresearchofthesection.Inaddition,theHuohuasec-,Xussno

24、&uoqjeuJuMoq£LithologyDistributionofsomeimportantconodontelementsUBcOAva,xoddauMqsunqsDOUElouo-reuuou.enqaa三二w三wgpoxalfMlDSOPOM-zUD-PDnb.sdac-DEod個gg.sDED&M咨DE.sdaolaEad->.sap'oui掙ss=ZDJOC.sdaooE0d<<gq°oo.iaqDoi*-£DK8A0'a.4-*一sDEMda，qDloc.sdaoEEad->9D.s

25、7;dwqEoc.!2dBJ-oEE0d<A-SDWUsd-s'MssAao-DEcdS.8XO4snJSlauDOaod七.SIZIU8s=uDk.60s一daomluod令士Q&D，qc3DisAaoEEod-><-wgssDMPap.£H0*unEEO。9-cnulEO。odsdndSMJau*一odCalcareoussiltstoneCalcareniteSiltysilicalitcArgillaceouslimestoneMicriticlimestoneCalcareoussiltyargilliteBlackshaleFig.2St

26、ratigraphiccolumnanddistnbutionofconodontsattheHuohuasectiontionisverysimilartoHasselbachtalsectioninGermanylithologicallyanddcpositionally,andaroughdiscussiononthestratigraphiccomparisonoftheD-CboundarybedsismadeamongtheHuohuasection,MuhuasectioninChinaandtheHasselbachtalsectioninGermany.1 Descript

27、ionoftheHuohuaSectionThe"WangyouFonnation'owerpart):Bed33.morethan2()minthickness,greycalcarenitesand979bioclasticlimestones.Bed32.about12minthickness,darkgreythin-beddedsili-calitcsintercalatedwiththin-beddedsiltstones.Bed31.about11.5minthickness,greythick-bedded,massivebioclasticlimestone

28、swithrarebrachiopods;calciteveinsdevelopedinthelowerpart,butbeddingsdevelopedweaklyorinvisible.Bed30.about12.5minthickness,darkgreythick-beddedcalcareoussiltstonesandcalcareniteswithwell-developedconcordantbeddings.Bed29.about5niinthickness,darkgreymediumtothin-vjnutuiptypurDjDiyundinusjiid9ojDwjDjs

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40、-qSiqqjpwsauojsjpsputsouojs-pucspoppaq-unpAax2Einpjxputtu戲jnoqt-53pag:沖unqsSireq。制】K1(uuojuo3vj9po9puipjpuenunuiui03p”jqmuM(7Q/stipns*pun<yusqOAvqsjuopouoomojy訴。padopAapsaicuonjjsstse,sSuippaq8uunoospuejtrepjoouooqjiMsajtpnnoiropappaq-unpputsduoisauiTnpstp-oiqpappaq-sjonpAm3'swinpyipuitugmoqe

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42、phyTheDaihuaFormationwasfirstlynamedbyLi1161intheDaihuaareaofChangshunCounty,GuizhouProvinceandcharacterizedbyaseriesofbandedargiDaceouslimestones,nodularlimestonesandclasticlimestonesyieldingammoniteWocklumeniafauna.TheDaihuaFormationintheHuohuasectionisslightlydifferentfromthatofthenamingsectionin

43、theDaihuaareainlithology.IntheHuohuasection,thelowerpartoftheDaihuaFormationismarkedbydarkbrownsiliceousrocksinterhyeredwithgraymedium-tothick-beddedargillaceouslimestones,andtheupperpartischaracterizedbygreythickbeddedbandedandnodularmicriticEmestones.Nomacrofbssilssuchasammonites,trilobites,brachi

44、opodsandcoralshavebeenfounduptonow.Accordingtoourcurrentstudy,theDaihuaFormationshowsadeep-waterbasin-slopesedimentaryenvironment.TheChangshunShalewasnamedbyWangetal,7)intheMuhuaareaofChangshunCounty,GuizhouProvince.Originally,itwasproposedonlyfortheblackshalebed(2-5cminthickness)betweentheDaihuaFor

45、mationandtheWangyouFormation.Inthispaper,weusethenameoftheChangshunShale,butenlargeitssenseandconcept.IntheHuohuasection,theChangshunShaleisdominatedbygreythinbeddedsilicalitesandcalcareoussiltstoneswithconcordantandgradedbeddings,butonly20cmthickblackshalewithbivalvePosidoniaisdevelopedinitsbasalpo

46、rtion.IntheHasselbachtalsectionofGermanyandLaSerresectionofFrance,theHangenbergShaleisabout5mthickandsubdividedintotwoparts.Thebasalpartiscomposedofblackshales(only2一5cmthick),andtheupperpartiscomposedofgreyshales(morethan45cmthick).ItisveryclearthattheChangshunShaleintheHuohuasectioncanbecorrelated

47、withtheHangenbergShaleinGermanyandFrance.OnlythebasalblackshalebedoftheChangshunShaleortheHangenbergShalecanbetakenasthemarkerofglobalglacialoreustaticfallevent.TheWangyouFormationwasnamedbyWangetal四attheLao*aoposectionintheWangyouarea,ChangshunCounty,GuizhouProvince.AccordingtoWangetal,theWangyouFo

48、rmationisconformablyunderlainbytheDaihuaFormation,mainlyconsistingofgreymedium-tothick-beddedmicriticlimestones,bandedlimestonesandnodularlimestoneswithrichEarlyCarboniferousfossilssuchasammonites,conodonts,trilobites,ostracodsandbrachiopods.However,ithasbeenproventhattheDevonian-Carboniferousbounda

49、rydepositsintheLao'aoposectionareinhybridsedimentation,andtheLateDevonianandEarlyCarboniferousfossilsaremixedtogether.Thus,theDapoushangsectionhasbeenselectedasthereferencesectionoftheWangyouFormation,inwhichtheWangyouFormationisunderlainbytheDaihuaFormationandoverlainbytheMuhuaFormation.IntheHu

50、ohuasection,wetentativelyusethenameofthe"WangyouFormation*'forthelithounitabovetheChangshunShale,becauseofitslithologyanddepositionalfaciesdifferentfromthoseoftheWangyouFormationintheWangyou-Muhuaarea.3 BiostratigraphyBasedonthestratigraphicdistributionofconodonts,threeconodontgroupscanbere

51、cognizedinthestudiedsection:onegroupfromthebasalpartofthe"WangyouFormation",onegroupfromthebasalpartoftheChangshunShaleandonegroupfromtheupperpartoftheDaihuaFormation.TheconodontsfromthebasalpartoftheWangyouFormationarerare,andtheirstratigraphicrangesareverylong.PmunisrangesfromLateDevonia

52、n(thecrepidazone)toEarlyCarboniferous(theanchoralis-laiuszone);HindeodeIlasubtilisaregenerallyverycommonintheUpperDevonianandtheLowerCarboniferous.However,accordingtoHouetandJietal171,thebasalpartoftheWangyouFormationintheMuhuaareayieldsveryrichconodonts,suchasSiphonodellasulcala,Bispaihodusa.aculea

53、tus,B.a.anteposicomis,Spathognalhodusstarbilis.Pmunis,Po.p.purus,Po.p.subplanus,Pseudopolygnaihusdentilineatus,HindeodeIlasubtills,H.germana,Ozarkodinaregularis,Hibbardellasp.andFalcodusangulus.ItisveryclearthattheconodontsfromthebasalpartoftheWangy-ouFormationintheMuhuaareaareofanageofEarlyCarbonif

54、erous.Thus,thebasalpartoftheWangyouFormationintheHuohuasectionshouldbeassignedtoLowerCarboniferousonthebasisoftheregionalcomparisonbetweentheMuhuaareaandtheHuohuaarea.TheconodontsfromthebasalpartoftheChang-shunShalearealsoveryrare,andonlyPolygnathuspuruspuruswasfoundfromthebasalpartoftheChangshunSha

55、le.ItwasalsofoundfromtheGedongguanBedortheChangshunShaleoftheWangyouFormation(theUpperpraesideatazone)intheMuhuaarea,Changshun.PolygnathuspuruspurushasitsdistributionfromtheUpperpraesulcatazonetotheLowerduplicaiazone,butgenerallyitrichlyoccursintheUpperpraesideatazone.Thus,thestratumyieldingPolygnat

56、huspuruspurusisroughlyequaltothestratumoftheUpperpraesulcatazone.TheconodontsfromtheupperpartoftheDai-huaFormationaremuchricherthanthosefromthelowerpartoftheWangyouFormationandtheChangshunShale.Theyarecharacterizedbytherichoccurrenceofpalmatolepidgroup,suchasPalma-tolepisgr.gracilis.Pa.gr.sigmoidali

57、s,Palmalolepislenuipunctata,Palmatolepisgl.glabra,Palmalolepisgl.pectinaia,Palmatolepisgl.primaMl,PolmatolepisquadraniinodosainflexoideaandPalmatolepisma.marginifera.AllofthemareofFamennian(LaceDevonian)inage.PalmatolepistenuipunctaiarangesfromtheLatetriangulariszonetotheLatestcrepidazone;Palmatolep

58、isglabrarangesfromtheLatecrepidazonetotheLatetrachyterazone;PalmatolepisgracilisrangesfromtheLaterhombaideazonetotheMiddlepraesulcatazone;Palmatolepisma.marginiferarangesfromtheEarlymarginiferazonetotheLatestmarginiferazone;PalmatolepisquadrantinodosainflexoidearangeswithintheEarlymarginiferazone.In

59、addition,PolygnathusglaberrangesfromtheLaterhomboideazonetotheEarlytrachyterazone;Po.vogesirangesfromtheEarlyexpansazonetotheMiddlepraesulcatazone.AccordingtotheirstratigraphicdistributionandcorrehtionwiththesundardconodontzonesI，9_2n,thestratamainlyyieldingPalmatolepistenuipunctaia(Beds01-03)isroughlyequaltothestratafromtheEarlycrepidazonetotheLatestcrepidazones;thestratamainlyyieldingPa.glabra(Beds04-06)isroughlye-qualtothestratafromtheEarlyrhomboideazonetotheLaterhomboideazone;thestratamainlyyieldingPa.marginife