黑龙江省东部鸡西盆地城子河组下部早白垩世欧特里夫晚期海相沟鞭藻类  

LATE HAUTERIVIAN DINOFLAGELLATESF ROM THE LOWER PART OF THE CHENG ZIHE FOR MATION IN JIXI BASIN , EASTERN HEIL ONGJIANG ,NE CHINA

作　　者：何承全[1] 孙学坤[1] 

机构地区：[1]中国科学院南京地质古生物研究所,南京210008

出　　处：《古生物学报》2000年第1期46-62,共17页Acta Palaeontologica Sinica

基　　金：中国科学院古生物与古人类学科基础研究特别支持费资助!(No.96 0 3 );中国科学院留学经费择优支持回国工作基金项目!(No.940 70 3 )资助

摘　　要：描述黑龙江省东部鸡西盆地典型的城子河组下部海相层 (包括南部条带海相层 ,即原“石河北组”)的沟鞭藻类化石 15属 19种 ,含 1新种和 1新组合种。它们可分出两个沟鞭藻组合 :Odontochitinaoperculata Muderon giatetracantha组合 (下部)和Vesperopsiszhaodongensis组合 (上部) ;讨论沟鞭藻组合的特征及其地质时代 ,并与国际上有关地层进行对比 ,认为典型的城子河组下部海相层的时代为Hauterivian晚期。据此 ,推测城子河组下部 ,即海相层及其下的地层时代属Valanginian晚期—Hauterivian晚期。ChengziheFormationwidelydistributedineast ernHeilongjiangprovince,NEChinaisrepresented byclasticcoal bearingmeasureswithathicknessof 35 0— 2 30 0mandisgroupedbysandstone,siltstone, mudstonesandtuffs.Itstypesectionislocatedinthe JixiBasin ,easternHeilongjiang .Thepresentpaper dealswithdinoflagellatesrecoveredfromamarine blackmudstonebedintercalatedinthelowerpart(in cluding“ShihebeiFormation” ,bothareapproximate lyequivalenttoeachother)oftheChengziheForma tionintheJixiBasin .Atotalof 2 2dinoflagellatecyst taxaarerecorded ,ofwhich 19speciesreferringto 15 generaaredescribedandillustratedinthispaper,in cludingonenewspeciesandonenewcombination , Oligosphaeridium jixiensesp .nov .andCirculo diniumasymmetricum (Burger)comb .nov.They aresubdividedintotwoassemblages:( 1)TheOdon tochitinaoperculata MuderongiatetracanthaAssem blageinthelowerpartand ( 2 )TheVesperopsizhaodongensisAssemblageintheupper part.The firstassemblageischaracterizedbythepresenceof Odontochitinaoperculata ,Muderongiatetracantha , Batioladinium ?exiguum ,Gardodiniumtrabeculo sum ,Oligosphaeridium jixiensesp .nov.andby abundantPalaeoperidiniumcretaceum ,withasmall numberofKiokansium polypes,Circulodinium asymmetricum ,C .colliveri,Oligosphaeridiumcf. complex,O .totum ,Prolixosphaeridiumsp .,and rareEscharisphaeridiapocockii,Laciniadiniumxin jiangense,Nyktericystapuyangensis,etc .Thesecondassemblagerepresentsalowsalinedepositionalenvi ronmentduringtheregressionandismarkedbyusu allyabundantVesperopsiszhaodongensisandrare Palaeoperidiniumcretaceum ,Sentusidiniumminor andScenedesmuscf.dimorphus,etc.Basedon charactersofthedinoflagellateassemblagesandthe globalstratigraphicrangesofmanysignificant dinocystspecies (tableⅡ ) ,thetwoassemblagesare consideredtobeofLateHauterivianinage .Thus, theageofthelowerpartoftheChengziheFormation ispossiblytheLateValanginian—LateHauterivian .

关 键 词：沟鞭藻类 城子河组 欧特里夫晚期 早白垩世 

分 类 号：Q914[天文地球—古生物学与地层学]