| 内蒙古大青山煤田晚古生代砾岩的沉积特征 |
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| 引用本文： | 周安朝,赵省民,贾炳文.内蒙古大青山煤田晚古生代砾岩的沉积特征[J].沉积学报,2000,18(2):253-258. |
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| 作者姓名： | 周安朝 赵省民 贾炳文 |
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| 作者单位： | 1 西北大学地质系 西安 710069; |
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| 基金项目： | 国家自然科学基金;49672094; |
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| 摘 要： | 大青山煤田晚古生代地层中有 1 4层沉积砾岩。其中,晚石炭世地层中赋存 8层,二叠世 6层。通过对这些砾岩层的野外测量、室内岩矿鉴定等综合分析研究,查明晚石炭世的砾岩几乎全是稳定的单成分砾岩,石英砂岩和燧石质砾石的含量高达 93 %以上,砾石最大扁平面均向南倾,倾角在 5° - 1 0°之间,与砾岩伴生的粗粒石英砂岩发育大型低角度双向交错层理,萨胡环境判别参数等特征表明晚石炭世砾岩为滨海环境下的产物。二叠世的砾岩则主要是复杂成分的砾岩,尤其是早二叠世晚期及晚二叠世初期形成的 2层砾岩中砾石种类达 1 5种,以中酸性火山岩和火山碎屑岩砾石为主,并含较多量的变质岩和中酸性侵入岩砾石,砾岩层各种特征表明二叠世砾岩为河流相产物。大青山煤田晚古生代沉积砾岩的形成与北部造山带的隆升密切相关,它们是前陆盆地的沉积产物。
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| 关 键 词： | 内蒙古 晚古生代 砾岩 沉积相 |
| 收稿时间： | 1999-11-22 |
Study on Sedimentology Characteristics of the Late Paleozoic Conglomerates from Daqingshan Coalfield, Inner Mongolia |
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| ZHOU An-chao,ZHAO Xing-min,JIA Bing-wen.Study on Sedimentology Characteristics of the Late Paleozoic Conglomerates from Daqingshan Coalfield, Inner Mongolia[J].Acta Sedimentologica Sinica,2000,18(2):253-258. |
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| Authors: | ZHOU An-chao ZHAO Xing-min JIA Bing-wen |
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| Institution: | 1 Dept. of Geology Northwest University,Xi'an 710069;2 Institute of Mineral Deposits CAGS, Beijing 1000037;3 Dept. of Earth Science Taiyuan University of Technology,Taiyuan 030024 |
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| Abstract: | There are 14 layers of sedimentogenic conglomerates in Late Paleozoic strata fro m Daqingshan coalfield, in which 8 layers of conglomerates belong to Late Carbon iferous strata and 6 layers belong to Permian strata. Based on the outcrop measu rement, petrologic and minerologic determination and the other analysis to these conglomerates, it and that almost all conglomerates in Late Carbonifero us strata are stable single-component conglomerates, the content of quartz sands tone and flint pebbles is higher than 93%. The biggest flat faces of all pebbles dip to the south and dip angle is between 5°-10°. The coarse quartz sandston e associated with conglomerates develop big low angle double directional cross b edding, and the environmental discriminant parameters show that the conglomerate s in Late Carboniferous was deposited in coastal environment. The pebbles in Permian are mainly complex component, especially the pebbles of two conglomerat e layers formed in the late time of Earlier-Permian and early time of Late-Permi an are as many as 15 kinds which are mainly that of medium-acidic volcanics and volcaniclastic rock, and also contain more pebbles of metamorphic rock and mediu m-acidic intrusive rock. The characteristics of all the conglomerate layers show that the conglomerates of Permian are the products of river deposit. The sedime ntary conglomerates in Late Paleozoic from Daqingshan coalfield was tightly rela ted to the rising of northern orogenic zone and deposited in foreland basin. |
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| Keywords: | Inner Mongolia Late Paleozoic era conglomerate depositional facies |
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