| 滇西海相侏罗系 |
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| 引用本文： | 尹集祥
,方仲景.滇西海相侏罗系[J].地质科学,1973,8(3):217-237. |
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| 作者姓名： | 尹集祥 方仲景 |
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| 摘 要： | 前言我国的海相侏罗系有两种类型。一种是特提斯(Tethys)型,属于这一类型的有西藏、青海南部、新疆、滇西等地区的海相侏罗系,这些地层的岩性和动物群性质或多或少都能与欧洲、印度西部、东非甚至东印度群岛的侏罗系相对比。另一种是环太平洋型,属于这一类型的包括湖南、广东、东北等地区的海相侏罗系。除东北拉丹哈达岭有侏罗纪的海相沉积外,其余地区仅含有海相里阿斯统的中下部。关于在中国以及中南半岛地区特提斯型与环太平洋型两种里阿斯时期海相地层的关系,至今仍然不清楚。滇西是我国海相中生代地层发育比较好的地区之一,过去虽然经过洛齐(L.vonLoczy,1893年)和布朗(Brown,Coggin J.,1916年)等人的调查,但对中生代地层,尤其是侏罗系缺乏详细研究。
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| 关 键 词： | , |
MARINE JURASSIC IN WESTERN YUNNAN |
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| YIN JI-XIANG,FANG ZHONG-JING.MARINE JURASSIC IN WESTERN YUNNAN[J].Chinese Journal of Geology,1973,8(3):217-237. |
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| Authors: | YIN JI-XIANG FANG ZHONG-JING |
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| Abstract: | Marine Jurassic rocks occur along the Nuchiang drainage area. They can be divided into four formations. Lying disconformably or unconformably on older rocks, the Mengga formation (J21), 545-1000 m in thickness, consists mainly of purplish red arenaceous shale and sandstone intercalated with dolomitic limestone, oolitic limestone and lenticular gypsum. Near Liuwan, west of the Paoshan city, basalt occurs in the upper part of the formation. The Liuwan formation (J22), 35-666 m in thickness, consists of Shelly argillaceous limestone rich in brachiopods. The Long-hai formation (J23), about 200m in thickness, consists mainly of yellow argillaceous shale and siltstone containing, in the lower part, a rich pelecypod fauna. Lying disconformably on the Longhai formation the unfossiliferous Longkan formation (J3) is chiefly composed of reddish yellow quartzose sandstone and conglomerate, of which the exposed thickness is 285 m.The fossiliferous Middle Jurassic of this region may well be correlated with contemporaneous deposits of northern Tibet and southern Chinghai on the one hand, and with the Namyau series of the Northern Shan State on the other. |
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