地层学杂志

重测西藏南部江孜床得剖面后发现地层层序与前人认识完全相反，不只含上白垩统，还包括中—上侏罗统和整个白垩系；重新厘定了宗卓组、加不拉组，新建床得组，它们分属晚坎潘期—马斯特里赫特期、贝里阿斯期—三冬期和早—中坎潘期；由下向上可识别出６套沉积组合：安山岩层、黄层、黑层、白层、红层及滑塌层，大致对应于下热组（Ｊ２ｘ ）、维美组（Ｊ３ｗ ）、加不拉组（Ｋ（１－ ２）ｊ，床得浦段＋ 机布里段）、床得组（Ｋ２ｃ）、宗卓组（Ｋ２ｚｎ）

After the reinvestigating and detailedly remeasuring of the Chuangde section in Gyangze, South Tibet, we consider that the stratigraphical sequence is just reverse to that of Wu Haoruo in 1987. It seems that there are probably strata of Middle Jurassic to terminal Cretaceous age in which only the Upper Cretaceous was recognized by Wu Haoruo in 1987. Six depositionary formations, numely: the Andesite, Yellow Bed, Black Bed, White Bed, Red Bed and Olistostrome Bed are recognized. They roughly correspond to Xiare Fm. (J 2 x ), Weimei Fm.(J 3 w ), Jiabula Fm.(K 1-2 j ), Black Bed+White Bed, Chuangde Fm.(K 2 c ), and Zongzhuo Fm.(K 2 zn ) separately. Foraminiferans and radiolarians indicate that the top part of the Chuangde Creek Member (Black Bed) and the Jibuli Member (white Bed) were deposited during Cenomanian—Santonian, and the Chuangde Fm. or Red Bed are of early middle Campanian. So it is concluded that Zongzhuo Fm. is late Campanian—Maastrichtian in age and the lower Jiabula Fm., Chuangde Creek Member, belongs to Lower Cretaceous.