CAJ | 학술논문

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Dumortieria sp., Dactylioceras cf. directum (Buckman), Hildoceras sp., Clevi-ceras cf. elegans (Sowerby), Cleviceras sp., Polyplectus discoides Zieten, Phymatoceras cf. binodata (Buckman), Pleydellia cf. aalensis (Zieten).阿林阶的种有Phylloceras sp., Planammatoceras cf. lepsiusi (Gemmellaro), Erycites sp..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.
서장북부색왜화안다지구32°-33°N, 88°-91°E범위내적국석화석증명료동특제사북연주라기토아신기(Toarcian)화아림기(Aalenian)지층적존재.문내묘술11충,대다수속충도재국내수차보도,포괄상당우토아신기말기적aalensis국석대화아림기중기적murchisonae국석대적충, 타문분별대속우2아목、3초과、5과、9속,기중이Hildocerataceae초과적류형점주체.장북국석동물군화서특제사지중해구동기국석동물군구유경가밀절적친연관계.토아신계적충유Dumortieria sp., Dactylioceras cf. directum (Buckman), Hildoceras sp., Clevi-ceras cf. elegans (Sowerby), Cleviceras sp., Polyplectus discoides Zieten, Phymatoceras cf. binodata (Buckman), Pleydellia cf. aalensis (Zieten).아림계적충유Phylloceras sp., Planammatoceras cf. lepsiusi (Gemmellaro), Erycites sp..국석화침적암자료표명,재조토아신말기화만토아신말기지조아림기시장북지구결양흑색혈암침적시기;국석동물군적확산화흑색혈암상적발생시전구고해평면적지구성향응.