泰国北部中三叠世放射虫硅质岩及其地球化学和沉积环境意义

BeddedchertscollectedfromnorthernThailand,includingChiangDao,LamphunandDenChaicontainMiddleTriassicradiolarianfaunas.ThefaunasfromChiangDaocanbedividedintotwoassemblages.ThefirstassemblageincludesEptingiumandotherco-occurringspeciessuchasCryptostephanidiumcornigerumDumitric?,PlafkeriumantiquumSugi-yama,Pseudostylosphaeracompacta(NakasekoandNishimura),P.longispinosaKozurandMostler,P.acrior(Bragin),P.japonica(NakasekoandNishi-mura),Parasepsagonsp.cf.P.variabilis(NakasekoandNishimura),Hozmadiasp.cf.H.gifuensisSugi-yama,Triassospongosphaeramultispinosa(KozurandMostler),CellurontadonaxSugiyama,Oertlispongussp.cf.O.diacanthusSugiyama,ParoertlispongusmultispinosusKozurandMostler,etc.Thesecondas-semblageconsistsofTriassocampedeweveri(Na-kasekoandNishimura),YeharaiaannulataNakasekoandNishimura,Hindeostylosphaeraspinulosa(Na-kasekoandNishimura),PlafkeriumcontortumDumitric?,KozurandMostler,Pseudostylosphaeragoestlingensis(KozurandMostler),P.timorensisSa-shidaandKamataandParoertlispongusrarispinosusKozurandMostler.TheseassemblagesindicateupperanduppermostAnisian,respectively.