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题名陕西汉中梁山吴家坪灰岩的再研究(Restudies on the Wujiaping Limestone Liangshan of Hanzhong,Shaanxi)
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作者芮琳 赵嘉明 穆西南 王克良 王志浩 (Rui Lin Zhao Jia-ming Mu Xi-nan Wang Ke-liang and Wang Zhi-hao)
1984年8卷3期 页码:179-193
文摘
    The Wuchiaping Limestone was proposed by Lu Yan-hao in 1956.The type locality is at Liangshan of Hanzhong,Shaanxi, This limestore can be classified into 32 Units,of which Units 1 to 16 belong to the Wuchiapingian stage,and Units 17 to 32 to the Changhsingian Stage.The Wuchiapingian,about 232.1m thick,is mainlycomposed of Light grey and grey wackestone and packstone as well as few mudstones containing the Codonofusiella zone,Hemigordius wuchiapingensis assemblage zone, Neogondolella bitteri-N. liangshanensis zone,LiangshanoPhy-
llum lui-L.wuae assemblage zone,and Cymnocodium bellerophotus,Permocalculus (Pyrulites) fragilis.etc. The Changhsingian is about 154.93 m thick,consisting of the light grey and light brownish grey grainstone and packstone,with the Palaeofusulina minima-Gallowayinella subzone below and the Palaeofusulina sinensis subzone above,the Pararobuloides orientails-Multidiscus perforatus assemblage zone below and the Damarita altilis-D.chanakckensis assemblage zone above ,the Waagenophyllum minutum zone and Permocalculus (Pyrulites) sinicus,etc.The characters of lithofacies and biofacies indicate that during Wuchiapingian time,the sedimentary environment of the type locality was of open,warm,clean and shallow water with a normal salinity and sufficient oxygen as well as lower energy.However,during Changhsingian time,sea water was shallower than that of Wuchiapingian time and lower energy environment had changed into a medium amd high energy one on account of successive regressions.
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