| 内蒙古西部额济纳旗及邻区上石炭统—下二叠统
阿木山组的沉积特征和时代 |
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| 引用本文： | 卜建军,牛志军,吴 俊,段先锋.内蒙古西部额济纳旗及邻区上石炭统—下二叠统
阿木山组的沉积特征和时代[J].地质通报,2012,31(10):1669-1683. |
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| 作者姓名： | 卜建军 牛志军 吴 俊 段先锋 |
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| 作者单位： | 1. 武汉地质调查中心,湖北 武汉 430223；
2. 中国地质大学(武汉)研究生院，湖北 武汉 430074 |
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| 摘 要： | 额济纳旗地区是阿木山组分布的最西端，产出于伸展背景下的裂谷环境，火山岩比较发育，从下到上可分为火山岩段、灰岩段和碎屑岩段。火山岩段和灰岩段产丰富 的 类化石，灰岩段下部产丰富的珊瑚化石。珊瑚化石的时代主要为晚石炭世， 类从下到上分别属于Triticites组合和Pseudoschwagerina组合，从而确定阿木山组的3个岩性段之间以叠覆关系为主，地质时代为晚石炭世至早二叠世，其中火山岩段为晚石炭世小独山期或更早；灰岩段下部为小独山期，上部为紫松期；碎屑岩段为早二叠世紫松期或更晚一些至隆林期。
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| 关 键 词： | 阿木山组 晚石炭世 早二叠世 珊瑚 额济纳旗地区 |
Sedimentary characteristics and age of Amushan Formation in Ejin Banner and its adjacent areas, western Inner Mongolia |
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| BU Jian-jun,NIU Zhi-jun,WU Jun,DUAN Xian-feng.Sedimentary characteristics and age of Amushan Formation in Ejin Banner and its adjacent areas, western Inner Mongolia[J].Geologcal Bulletin OF China,2012,31(10):1669-1683. |
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| Authors: | BU Jian-jun NIU Zhi-jun WU Jun DUAN Xian-feng |
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| Institution: | 1. Wuhan Center of Geological Survey, Hubei 430223, Wuhan, China;
2. Graduate School of China University of Geoscience(Wuhan), Wuhan 430074, Hubei, China |
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| Abstract: | The westernmost end of the Amushan Formation is Ejin Banner area. The Amushan Formation was formed in an extended setting of rift, with abundant volcanic eruption. It comprises three units, namely volcanic rocks, limestone, and clastic rocks. Abundant fusulinids were found in units of volcanic rocks and limestone. In addition, abundant coral fossils indicating the age of Late Carboniferous were found in the lower part of limestone. The fusulinids from units of volcanic rocks and limestone of Amushan Formation belong to fusulinid Triticites and Pseudoschwagerina assemblages, suggesting that the Amushan Formation should be assigned to the Late Carboniferous-Early Permian period; in addition, the unit of volcanic rocks should be assigned to the Late Carboniferous Xiaodushanian stage or even earlier, the lower part of limestone unit to Xiaodu Shanian stage, the upper part of limestone unit to Zisongian stage and the clastic rocks unit to the Early Permian Zisongian stage or even to later Longlinian stage. |
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| Keywords: | Amushan Formation Late Carboniferous Early Permian coral fusulinid Ejin Banner area |
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