| 陕南西乡晚二叠世大隆组及其沉积环境 |
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| 引用本文： | 金若谷.陕南西乡晚二叠世大隆组及其沉积环境[J].地层学杂志,1987(4). |
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| 作者姓名： | 金若谷 |
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| 摘 要： | <正> 西乡地区大隆组分布于木竹坝、三郎铺、堰口至峡口一线之南,呈SW—NE向带状延伸。西南与四川南江、旺苍和广元一带的大隆组相连,向东北沿北方古陆与川西北、鄂皖苏地区的大隆组衔接,南北两侧与碳酸盐相长兴组毗邻。
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Late Permian Dalong Formation of Xixiang, southern Shaanxi and its sedimentary environment |
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| Abstract: | The late Permian Dalong Formation in Xixiang of southern Shaanxi is composed of grey-black thin-bedded argillaceous rocks (including calcareous mudstone, carbonaceous shale and black shale), argillaceous and siliceous micrites and muddy-dolomitic limestones rich in organic material and pyrite. The biota are chiefly planktonic and epiplanktonic faunas such as ammonoids, radiolarians, thin-shelled bra-chiopods and a few conodonts, foraminifers, sponge spicules, bivalves, trilobites and corals. From above, it may be seen that the Dalong Formation was formed in a deeper, off-shelf to basin environment, in which the sea bottom was quiet and stagnent, belonging to a slightly reductive and reductive condition; the upper part of sea water was warm, with normal salinity and the circulation of water current was moderate. The sea water may be less than 100-200m in depth. |
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