| 内蒙古大青山地区中、上侏罗统大青山组的修订 |
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| 引用本文： | 彭向东,徐仲元,刘正宏.内蒙古大青山地区中、上侏罗统大青山组的修订[J].地层学杂志,2003,27(1):66-70. |
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| 作者姓名： | 彭向东 徐仲元 刘正宏 |
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| 作者单位： | 吉林大学地球科学学院,吉林长春,130061 |
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| 基金项目： | 国土资源部地调局内蒙古大青山地区 6幅 1/5万区域地质调查项目 ( 0 1992 0 90 31)，内蒙古 1/2 5万《包头市幅》区域地质调查项目 ( K49C0 0 40 0 2 ) |
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| 摘 要： | 内蒙古大青山地区侏罗纪地层发育齐全 ,下、中侏罗统五当沟组为一套含煤碎屑沉积 ,中侏罗统长汉沟组为灰绿色粉细砂岩夹灰岩及砂砾岩 ,中、上侏罗统大青山组为紫色碎屑岩系 ,构成了一个完整的盆地演化序列。由于区内中生代逆冲推覆构造极其发育 ,使得区内不同时代的地层均呈构造岩片相互叠置 ,给地层划分和对比带来许多困难 ,前人所划分的中、上侏罗统大青山组 ,其中绝大部分并非大青山组 ,而是上二叠统脑包沟组和下白垩统李三沟组及固阳组。通过大量的野外调查工作 ,笔者对区内大青山组的地层层序、展布规律以及与下伏地层的接触关系性质等都重新给予厘定 ,提出大青山地区上侏罗统大青山组为一套干旱炎热气候条件下的河湖相沉积、生物贫乏 ,分布严格受坝岩—席麻湾—金銮殿断裂控制 ,与下伏地层局部呈不整合 ,整体呈假整合接触 ,这些结论对区内地层划分、对比以及地质演化历史的研究具有重要意义。
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| 关 键 词： | 大青山 内蒙古 中、上侏罗统、大青山组 |
| 文章编号： | 0253-4959(2003)01-0066-05 |
| 修稿时间： | 2002年8月4日 |
REVISION OF THE MIDDLE AND UPPEF JURASSIC DAQINGSHAN FORMATION IN DAQINGSHAN AREA, INNER MONGOLIA |
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| PENG Xiang-dong,XU Zhong-yuan,and LIU Zheng-hong.REVISION OF THE MIDDLE AND UPPEF JURASSIC DAQINGSHAN FORMATION IN DAQINGSHAN AREA, INNER MONGOLIA[J].Journal of Stratigraphy,2003,27(1):66-70. |
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| Authors: | PENG Xiang-dong XU Zhong-yuan and LIU Zheng-hong |
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| Abstract: | The Jurassic strata in the Daqingshan area are completely developed.The Lowper-Middle Jurassic Wudanggou Formation is composed of coal-bearing clastic sediments, the Middle Jurassic Changhangou Formatin consists of grey-green silty and fine sandstone intercalated with sandy conglomerate and marl, and the Middle-Upper Jurassic Daqingshan Formation is made up of purple clastic rock series, forming a complete evolutionary series of basin. Because the Mesozoic thrust nappes within this area are structurally very well developed, the strata of different ages within this area are all superimposed on each other like tectonite, rendering it very difficult to divide and correlate the strata. Most of the Middle-Upper Jurassic Daqingshan Formation defined in the past are not the Daqingshan Formation and belong to the Upper Permian Naobaogou Formation and the Lower Cretaceous Lisangou and Guyang Formations. Based on a great number of field investigations the stratigraphic sequence, developmental and distribution laws and the contact relationship with the underlying strata are collated and stipulated by the authors, who suggest that the Upper Jurassic Daqingshan Formation in the Daqingshan area is composed of fluviolacustrine sediments deposited in a dry and hot condition, with organisms being poor, distribution being controlled by the Bayan-Ximanwan-Jinluandian fault, a part being unconformable with the underlying strata, and an entirety being pseudoconformable. These conclusions are of important significance in the division and correlation of the strata within this area and the study of the geological evolutionary history. |
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| Keywords: | Inner Mongolia Middle and Upper Jurassic Daqingshan Formation |
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