| 新疆乌鲁木齐地区中—晚石炭世地层划分 |
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| 引用本文： | 王宝瑜.新疆乌鲁木齐地区中—晚石炭世地层划分[J].地层学杂志,1988(1). |
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| 作者姓名： | 王宝瑜 |
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| 摘 要： | <正> 乌鲁木齐地区中一晚石炭世地层主要发育在乌鲁木齐市以东约20km的柳树沟、祁家沟和井井子沟等地。该区出露的石炭纪地层有:中石炭统柳树沟组、祁家沟组,上石炭统奥尔吐组。其中祁家沟剖面曾作为1977年北方槽区会议重点参观剖面。 本文引用的地层资料除1977年地层队测制的剖面外,还列出了1965年新疆区调大队六分队测制的柳树沟剖面。文中化石分别由侯鸿飞、张梓歆(腕足类)、孙巧缡(类)、
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Subdivision of the Middle-Late Carboniferous strata in the Urumqi area, Xinjiang |
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| Abstract: | The marine Middle-Late Carboniferous strata are widely distributed in Liushugou, Qijiagou and Jingjingzigou of Urumqi, Xinjiang. Strata under discussion may be divided into three formations, namely, the Liushugou, Qijiagou and Aoertu Formations.The Liushugou Formation is subdivided into two subformations. The lower one is made up of grey-greenish, medium-bedded to massive interbeds, intermediate-acid tuff and volcanic rocks and a few siliceous rocks, totalling 1131m in thickness. The upper one is composed of green, grey-violetish volcanic breccia, and agglomerate, intercalated with a few andesitic porphyrite, with a thickness of 894 m. The modified Qijiagou Formation, 189 m thick, consists o5 carbonate and clastic rocks of normal littoral shallow water facies and contains abundant fusulinids, brachiopods, corals. In the present paper the volcanic and volcanic clastic rocks in the lower part of the Qijiagou Formaiion has been incorporated mto the Liushugou Formation. Thus, the contact between the Qijiagou and Liushugou Formations is conformable. The Aoertu Formation is also subdivided into two subformations. The lower one consists chiefly of carbonate rocks intercalated with a few calcium-bearing clastic rocks of 66 m thick, containing brachiopods, corals, etc. The upper one is made up of the normal clastic rocks intercalated with a few carbonate rocks of 175-228 m thick, yielding gastropods, cephalopods and a few corals, brachiopods. |
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