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AStudyontheDeep-seaSedimentoftheGuanyinqiaoMemberoftheUpper
OrdovicianWufengFormationintheYangtzeArea
XULunxun,XIAOChuantao,GONGWenping,HEYoubi
GeosciencesCollegeofYangtzeUniversity,Jingzhou,Hubei,434023
Abstract
ThroughacomparisonofsedimentationratesbetweentheGuanyinqiaoMemberandmoderndeep-seade-positsandanalysesofpaleoecology,paleobiogeography,sea-levelchangesandcomprehensivegeologicalcharac-teristicsoftheGuanyinqiaoMember,theauthorsholdthattheGuanyinqiaoMemberwasformedinadeep-seaenvironmentandshouldbelongtothedeep-seacontourites.Inaddition,theauthorssuggestthattheextensivevolcaniceventsfrequentlyoccurredattheturnofOrdovician-Silurianmaybethemainanddirectcauseforor-ganismextinctionandthatthecouplingofvolcanicevents,iridiumandcarbonisotopicabnormalityeventsandtheanoxiceventintheearlystageoftheSilurianatthattimemaybethemaincausefortheextinctionoftheHirnantia-Dalmanitinafauna.Keywords:GuanyinqiaoMember;Yangtzearea
Deep-seasedimentation;organismextinction;geologicalevent;
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