| 陕西汉中梁山吴家坪灰岩的再研究 |
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| 引用本文： | 芮琳
,赵嘉明
,穆西南
,王克良
,王志浩.陕西汉中梁山吴家坪灰岩的再研究[J].地层学杂志,1984(3). |
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| 作者姓名： | 芮琳 赵嘉明 穆西南 王克良 王志浩 |
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| 摘 要： | <正> 吴家坪灰岩一名系卢衍豪(1956)创立,标准剖面在陕西汉中梁山。卢氏根据其中(竹蜓)和珊瑚把吴家坪灰岩综合成Codonofusiella-Reichelina和Liangshanophyllum带,并认为此层灰岩及其下伏的王坡页岩与长兴灰岩和大羽羊齿植物煤系(或竹塘系)之间为相变关系;吴家坪灰岩代表了梁山区上二叠统的中、上部,乃至世界各地含(竹蜓)的最高地层,可能和
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Restudies on the Wujiaping Limestone from Liangshan of Hanzhong, Shaanxi |
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| Abstract: | 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. 1 m thick, is mainly composed of Light grey and grey wackestone and packstone as well as a few mudstones containing the Codonofusiella zone, Hemigordius wuchiapingensis assemblage zone, Neogondolella bitteri-N. liangshanensis zone, Liangshanophyl-lum lui-L. wuae assemblage zone, and Cymnocodium bellerophotus, Permocalculus (Pyrulites) fragilis. etc. The Changhsingian is about 154. 93 m thick, consisting of light grey and light brownish grey grainstone and packstone, with the Palaeofusulina minima-Gallowaymella subzo-ne below and the Palaeofusulina sinensis subzone above, the Pararobuloides orientalis-Multidis-cus 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 suffcient oxygen as well as lower energy. However, during Changhsingian time, sea water was shallower than that of Wuchiapingian time and the lower energy environment had changed into a medium and high energy one on account of successive regressions. |
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