江苏仑山地区上奥陶统五峰组放射虫动物群及其地质意义
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摘要
五峰组以盛产笔石动物群著称,时代为凯迪晚期(相当于英国的阿什极尔期),其中也发现了放射虫。该时期的放射虫在全球并不多见。本文首次描述江苏句容仑山地区五峰组的放射虫动物群,该动物群以不具刺的球形放射虫最为发育,并出现少量Inaniguttidae科的分子,化石保存较差,属种单调,分异度很低,这些特点与大西洋沿岸地区陆表海中的古生代放射虫特征一致。所以,五峰组放射虫动物群的出现支持该组形成于浅海环境的假说,而不支持深海成因论。
Ordovician radiolarians have been reported from intervals ranging from the Tremadocian to early Kaitian,but so far not yet from late Katian globally.Herein we report the discovery of radiolarians from the Wufeng Formation of late Katian(Ashgill) age at the Lunshan section,Jurong,Jiangsu Province,South China.The Wufeng Formation is lithologically typified by black shale and cherts,and has been well-known for containing diverse graptolite fauna.The yielded radiolarian fauna,though in a low diversity,is characterized by rich sphaerical forms without any spines on the shell and a few species of the Family Inaniguttidae.The specimens are relatively poor-preserved,and the fauna is monotonous.The faunal characteristics of the radiolarians are similar to those recorded from the Paleozoic epi-continental sea of Atlantic,suggesting that the Wufeng Formation was formed also in a shallow-water environment,rather than in the deep ocean as previously proposed by some specialists.
Ordovician radiolarians have been reported from intervals ranging from the Tremadocian to early Kaitian,but so far not yet from late Katian globally.Herein we report the discovery of radiolarians from the Wufeng Formation of late Katian(Ashgill) age at the Lunshan section,Jurong,Jiangsu Province,South China.The Wufeng Formation is lithologically typified by black shale and cherts,and has been well-known for containing diverse graptolite fauna.The yielded radiolarian fauna,though in a low diversity,is characterized by rich sphaerical forms without any spines on the shell and a few species of the Family Inaniguttidae.The specimens are relatively poor-preserved,and the fauna is monotonous.The faunal characteristics of the radiolarians are similar to those recorded from the Paleozoic epi-continental sea of Atlantic,suggesting that the Wufeng Formation was formed also in a shallow-water environment,rather than in the deep ocean as previously proposed by some specialists.
引文
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吴浩若,1986.放射虫岩及其地质意义.国外地质,7:1-4
肖传桃,姜衍文,朱忠德,李艺斌,1996.湖北宜昌地区奥陶纪层序地层及扬子地区五峰组沉积环境的讨论.高校地质学报,2(3):339-347
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高振中,何幼斌,李罗照,卿崇文,肖明国,程四洪,张文成,刘伟伟,2008.中国南方上奥陶统五峰组观音桥段成因讨论:是"浅水介壳相",还是深水异地沉积古地理学报,10(5):487-494
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穆恩之,潘江,俞昌民,1955.南京汤山奥陶纪地层新知.地质知识,1:23-24
穆恩之,陈旭,李积金,倪寓南,葛梅钰,林尧坤,1981.华中区晚奥陶世古地理图及其说明书.地层学杂志,5(3):165-170
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AITCHISONJ C,FLOOD P G,MALPASJ,1998.Lowermost Or-dovician(basal Tremadoc)radiolarians from the Little PortComplex,western Newfoundland.Geological Magazine,135:413-419
BUCKMAN S,AITCHISONJ C,2001.Middle Ordovician(Lland-eilian)radiolarians from West Junggar,Xinjiang,China.Mi-cropalaeontology,47(4):359-367
CHEN Xu,RONG Jiayu,MITCHELL C E,HARPER D A T,FAN Junxuan,ZHAN Renbin,ZHANG Yuandong,LIRongyu,WANG Yi,2000.Late Ordovician to earliest Siluriangraptolite and brachiopod biozonation fromthe Yangtze region,South China with a global correlation.Geological Magazine,137(6):623-650
CHEN Xu,RONGJiayu,LI Yue,BOUCOT AJ,2004.Facies pat-terns and geography of the Yangtze region,South China,through the Ordovician and Silurian transition.Palaeogeogra-phy,Palaeoclimatology,Palaeoecology,204:353-372
CHEN Xu,RONGJiayu,FANJunxuan,ZHAN Renbin,MITCH-ELL C E,HARPER D A T,MELCHI N MJ,PENG Pingan,FI NNEY S C,WANG Xiaofeng,2006.The Global BoundaryStratotype Section and Point(GSSP)for the base of the Hir-nantian Stage(the uppermost of the Ordovician System).Epi-sodes,29(3):183-196
CUI Zhilin,HUA Hong,SONG Qingyuan,2000.The Late Ordovi-cian radiolarian assemblage of the North Qinling Back-arc Ba-sin,China.Acta Geologica Sinica,74(3):254-258
DANIELAN T,1999.Taxonomic study of Ordovician(Llanvirn-Caradoc)Radiolaria fromthe Southern Upland(Scotland,U.K.).Geodiversitas,21:625-635
DANIELAN T,CLARKSON E N K,1998.Ordovician Radiolariafrombedded cherts of the Southern Uplands.Scottish Journalof Geology,34(2):133-137
DANIELAN T,FLOYD L,2001.Ordovician siliceous biodiversityfromthe Southern Upland(Scotland,U.K.).Transactions ofthe Royal Society of Edinburgh-Earth Sciences,91:489-498
DANIELAN T,POPOV L E,2003.Ordovician radiolarian biodi-versity insights based on new and revised data from Kazakh-stan.Bulletin SociétáGéologigue France,174(4):325-335
FANG Zongjie,1989.Remarks about"On Hunanopecten"with areview on deepwater origin of Talung Formation.Acta Palaeon-tologica Sinica,28(6):711-723
GAO Z Z,HE Y B,LI L Z,QI NG C W,XI AO M G,CHENG SH,ZHANG WC,LI U W W,2008.Genesis of the Guanyin-qiao Member of Upper Ordovician Wufeng Formation in south-ern China:"Shallow-water shelly facies"or deep-water allogenicdeposition Journal of Palaeogeography,10(5):487-494
GENG Liangyu,1986.On the epiiric sea origin of the Latest Ordo-vician Wufeng Shale in Upper Yangtze area with a reviewonitsoceanic origin.In:The Palaeontological Scoiety of China(ed.),Selected papers from the13thand14thannual conven-tions of Palaeontological Society of China.Hefei:Anhui Scienceand Technology Publishing House.103-114
GORICA H,1994.Late Caradoc and Early Loudlow Radiolaria fromBaltic erratic boulders.Acta Palaeontologica Polonica,39(2):168-179
GOTO H,ISHIGA H,1991.Study of Late Ordovician radiolariansfromthe Lachlan Fold Belt,Southeastern Australia.GeologyReports Shiname University,10:57-62
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