淮南地区新元古代刘老碑组叠层石消失原因初探
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摘要
安徽淮南地区新元古代刘老碑组主要由页岩和中薄层泥质、粉砂质灰岩组成。在该组上部中薄层砂质灰岩中产有该地区新元古代最古老的叠层石Baicalia和?Linella。大量的臼齿碳酸盐脉体穿插在该组叠层石的基本层中的现象较为独特,该组上部发育的滑塌构造和臼齿碳酸盐岩脉体的特征表明该沉积时期发生过强烈的地震活动;此外,在叠层石礁体周围还有大量的风暴沉积产出。这些现象表明,该组叠层石发育于风暴活动和地震活动交织的环境之中,地震活动是导致该组叠层石消失的主要原因。
The Neoproterozoic Liulaobei Formation in the Huainan region, Anhui Province mainly consisits of shale and sandy and silty limestone. The stromatolites Baicalia and ?Linella, which crop out from the upper limestone strata, are the oldest Neoproterozoic stromatolites in this area. It is peculiar that many molar-tooth carbonate(MTC) veins interpenetrated into the basic layer of the stromatolites. The slump structures and the characters of the MTC veins indicate that intense earthquake events had happened during this deposit period. The phenomena that storm deposits and earthquake deposits crop out with stromatolites indicate that the stromatolites were formed in the environment that storm and earthquake events happened alternately, and the disastrous earthquake events made the stromatolites disappear from the Liulaobei Formation.
The Neoproterozoic Liulaobei Formation in the Huainan region, Anhui Province mainly consisits of shale and sandy and silty limestone. The stromatolites Baicalia and ?Linella, which crop out from the upper limestone strata, are the oldest Neoproterozoic stromatolites in this area. It is peculiar that many molar-tooth carbonate(MTC) veins interpenetrated into the basic layer of the stromatolites. The slump structures and the characters of the MTC veins indicate that intense earthquake events had happened during this deposit period. The phenomena that storm deposits and earthquake deposits crop out with stromatolites indicate that the stromatolites were formed in the environment that storm and earthquake events happened alternately, and the disastrous earthquake events made the stromatolites disappear from the Liulaobei Formation.
引文
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[25] FairchildIJ,SongTR.PossibleseismicoriginofmolartoothstructuresinNeoproterozoiccarbonaterampdeposit,NorthChina[J].Sedimentology,1997,44:611-636.
[26] CalverCR,BailliePW.EarlydiageneticconcretionassociatedwiththeintrastratalshrinkagecracksinanupperProterozoicdolomite,Tasmania,Australia[J].JournalofSedimentaryPetrology,1990,60:293-305.
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[29] 李双应,洪天求,郑文武,等.皖北新元古代刘老碑组滑塌沉积及其地质意义[J].合肥工业大学学报(自然科学版),2003,26(6):1115-1120.
[2] 郑文武.皖北震旦系中Chuaria等化石的发现及其意义[J].中国地质科学院天津地质矿产研究所分刊,1980,1(1):49-69.
[3] DuanCH.LatePrecambrianalgaemegafossilsChuariaandTawuiainsomeareasofeasternChina[J].Alcheringa,1982,(6):57-68.
[4] 汪贵翔,周本和,肖立功.安徽淮南上前寒武系宏体化石及其意义[J].地层学杂志,1984,8(4):271-278.
[5] 陈孟莪,郑文武.先伊迪卡拉期的淮南生物群[J].地质科学,1986,31(3):221-231.
[6] SunWG,WangGX,ZhouBH.Macroscopicworm-likebodyfossilsfromtheupperPrecambrian(900～700Ma),Huainandistrict,Anhui,Chinaandtheirstratigraphicandevolutionarysignificance[J].PrecambrianResearch,1986,31(3):377-403.
[7] ChenJY.PrecambrianmtazoansoftheHuaiRiverdrainagearea(Anhui,EChina):Theirtaphonomicandecologicalevidence[J].SenckenbergianaLethaea,1988,69(3,4):189-215.
[8] 符俊辉.淮南生物群的组合面貌及其特征[J].古生物学报,1989,28(5):642-652.
[9] 牛绍武.狄更逊虫类化石在我国的首次发现[J].前寒武纪研究进展,1997,20(3):50-55.
[10] 阎永奎.安徽凤阳地区震旦亚界刘老碑组的微古植物群[J].中国地质科学院南京地质矿产研究所分刊,1982,3(1):49-69.
[11] 阎永奎.微古植物(浸解法)[A].《苏皖北部上前寒武系研究》项目协作组.苏皖北部上前寒武系研究[C].合肥:安徽科学技术出版社,1984.85-93.
[12] 尹崇玉.安徽淮南地区晚前寒武纪微古植物群及其地层意义[A].中国地质科学院地层古生物论文集编委会.地层古生物论文集(12)[C].北京:地质出版社,1985.91-115.
[13] ZangWL,WalterMR.LateProterozoicandEarlyCambrianmicrofossilsandbiostratigraphy,northernAnhuiandJiangsu,centraleasternChina[J].PrecambrianResearch,1992,57:243-323.
[14] YinLM,SunWG.MicrobiotafromtheNeoproterozoicLiulaobeiFormationintheHuainanregion,northernAnhui,China[J].PrecambrianResearch,1993,65:95-114.
[15] 曹瑞骥,赵文杰,夏广胜.安徽北部前寒武纪叠层石[A].中国科学院南京地质古生物研究所集刊(21)[C].北京:科学出版社,1985.1-84.
[16] 乔秀夫,高林志.华北中新元古代及早古生代地震灾变事件及与Rodinia的关系[J].科学通报,1999,44(16):1753-1757.
[17] 乔秀夫,高林志,彭 阳.古郯庐带新元古界——灾变、层序、生物[M].北京:地质出版社,2001.98-107.
[18] 贾志海,洪天求,郑文武,等.皖北新元古代望山组震积岩的基本特征及其形成环境分析[J].地层学杂志,2003,27(2):146-149.
[19] 刘燕学,旷红伟,蔡国印,等.辽南新元古代营城子组臼齿灰岩的沉积环境[J].地质通报,2003,22(6):419-425.
[20] KnollAH.MicrobiotasoftheLatePrecambrianHunnbergFormation,NordaustlandetSvalbard[J].JournalofPaleontology,1984,58:131-162.
[21] JamesNP,NarbonneGM,ShermanAG.Molar-toothcarbonates:ShallowsubtidalfaciesoftheMid-to-LateNeoproterozoic[J].JournalofSedimentaryResearch,1998,68:716-722.
[22] ShermanAG,NarbonneGM,JamesNP.AnatomyofacyclicallypackagedMesoproterozoiccarbonaterampinnorthernCanada[J].SedimentaryGeology,2001,139:171-203.
[23] PrattBR.Molar-toothstructureinProterozoiccarbonaterocks:Originfromsynsedimentaryearthquakes,andimplicationsforthenatureandevolutionofbasinsandmarinesediment[J].GeolSocAmerBull,1998,110(8):1028-1045.
[24] PrattBR.GasbubbleandexpansioncrackoriginofmolartoothcalcitestructuresintheMiddleProterozoicBeltSupergroup,WesternMontana—Discussion[J].JournalofSedimentaryResearch,1999,69:1136-1140.
[25] FairchildIJ,SongTR.PossibleseismicoriginofmolartoothstructuresinNeoproterozoiccarbonaterampdeposit,NorthChina[J].Sedimentology,1997,44:611-636.
[26] CalverCR,BailliePW.EarlydiageneticconcretionassociatedwiththeintrastratalshrinkagecracksinanupperProterozoicdolomite,Tasmania,Australia[J].JournalofSedimentaryPetrology,1990,60:293-305.
[27] FurnissG,RittleJF,WinstonD.Gasbubbleandexpansioncrackoriginof"molartooth"calcitestructuresintheMiddleProterozoicBeltSupergroup,WesternMontana[J].JournalofSedimentaryResearch,1998,68(1):104-114.
[28] WinstonD,RittelJF,FurnissG.Gasbubbleandexpansiononmolar-toothcalcitestructuresintheMiddleProterozoicBeltSupergroup,WesternMontana—Reply[J].JournalofSedimentaryResearch,1999,69:1140-1145.
[29] 李双应,洪天求,郑文武,等.皖北新元古代刘老碑组滑塌沉积及其地质意义[J].合肥工业大学学报(自然科学版),2003,26(6):1115-1120.
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