西藏北部色哇-安多地区侏罗纪菊石类与缺氧黑色页岩相被引量：12

JURASSIC AMMONITES IN ANOXIC BLACK SHALES FROM SEWA AND AMDO,NORTHERN TIBET

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摘要西藏北部色哇和安多地区32°-33°N,88°-91°E范围内的菊石化石证明了东特提斯北缘侏罗纪土阿辛期(Toarcian)和阿林期(Aalenian)地层的存在。文内描述11种,大多数属种都在国内首次报道,包括相当于土阿辛期末期的aalensis菊石带和阿林期中期的murchisonae菊石带的种,它们分别隶属于2亚目、3超科、5科、9属,其中以Hildocerataceae超科的类型占主体。藏北菊石动物群和西特提斯地中海区同期菊石动物群具有更加密切的亲缘关系。土阿辛阶的种有Dumortieriasp.,Dactyliocerascf.directum(Buckman),Hildocerassp.,Clevicerascf.elegans(Sowerby),Clevicerassp.,PolyplectusdiscoidesZieten,Phymatocerascf.binodata(Buckman),Pleydelliacf.aalensis(Zieten)。阿林阶的种有Phyllocerassp.,Planammatocerascf.lepsiusi(Gemmellaro),Erycitessp.。菊石和沉积岩资料表明,在早土阿辛末期和晚土阿辛末期至早阿林期是藏北地区缺氧黑色页岩沉积时期;菊石动物群的扩散和黑色页岩相的发生是全球高海平面的地区性响应。 Ammonite fossils in the present paper were collected from the area between 32°-33°N. and 88°-91°dentified as Phylloceras sp. , Dumortieria sp. , Dactylioceras cf. directum （ Buckman）, ？ Hildoceras sp. , Cleviceras cf. elegans. , Cleviceras sp. , Polyplectus discoides （ Zieten） , Phymatoceras cf. binodata （Buckman）, Pleydellia cf. aalensis （Zieten） , Planammatoceras cf. lepsiusi （Gemmellaro）, and Erycites sp. , are illustrated and described. Most of them are found in China for the first time, to which more mediterranean or submediterranean affinities have been assigned. The ammonites provide a biostratigraphie succession ranging from the Lower Toareian to Aalenian in northern Tibet with many obvious gaps. Anoxie black shales are recognized in the basal Toareian from Sewa, and in a transitional interval between the topmost Toareian to Aalenian from the east of Amdo, respectively.

作者阴家润高金汉王永胜张树岐郑春子徐德彪白志达孙立新苏新

机构地区中国地质大学吉林省地质调查院

出处《古生物学报》 CAS CSCD 北大核心 2006年第3期311-331,共21页 Acta Palaeontologica Sinica

基金国家自然科学基金(Nos.40572013 40320120168)资助课题。

关键词菊石缺氧黑色页岩土阿辛阶阿林阶色哇-安多西藏 ammonites, anoxic black shale, Toarcian, Aalenian, Sewa, Amdo, North Tibet

分类号 Q915 [天文地球—古生物学与地层学]

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