| 辽西义县盆地义县组底部沉积相与沉积环境分析 |
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| 引用本文： | 梁俊红,巩恩普,董旭明,崔显德,李小冬,王春红.辽西义县盆地义县组底部沉积相与沉积环境分析[J].沉积学报,2007,25(4):545-553. |
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| 作者姓名： | 梁俊红 巩恩普 董旭明 崔显德 李小冬 王春红 |
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| 作者单位： | 东北大学地质系 沈阳 110004 |
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| 基金项目： | 高等学校博士学科点专项科研项目
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辽宁省国土资源厅计划项目 |
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| 摘 要： | 辽西义县盆地下白垩统义县组底部发育有马神庙、老公沟两个沉积层。马神庙沉积层从下至上可以划分出6个沉积亚层，其下部复成分砾岩沉积层为干旱气候条件下形成的洪（冲）积扇底部沉积相、洪（冲）积扇上的山洪冲槽充填相；中部为复成分砾岩夹凝灰质沉积层；顶部被中基性的火山岩覆盖。老公沟沉积层下部是以泥质粉砂岩为主的滨浅湖相、洪（冲）积扇向湖盆过渡的季节性河流作用形成的粗砂岩—含砾粗砂岩沉积相；顶部为一套滨浅湖相的膨润土化粉砂岩—膨润土—碳酸盐岩沉积岩石组合。义县盆地演化初期气候干旱，盆地边缘地势起伏较大，盆地边缘形成洪（冲）积扇、扇面上发育洪槽充填沉积作用，洪（冲）积扇向湖盆过渡区存在季节性河流；老公沟顶部湖泊相沉积指示受区域季节性变化的半干旱、频繁火山作用影响下，湖盆水深频繁波动的古地理、古气候的沉积特征。义县组底部沉积相表现了该盆地边缘向中心横向上的洪（冲）扇、季节性河流和湖泊沉积的三相发育的古地理特征。
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| 关 键 词： | 义县盆地 义县组 马神庙沉积层 老公沟沉积层 沉积相 沉积环境 |
| 文章编号： | 1000-0550（2007）04-0545-09 |
| 收稿时间： | 2006-11-22 |
| 修稿时间： | 2006-11-222006-12-14 |
Sedimentary Facies and Palaeoenvironment Analyses on Yixian Formation Bottom Layers of Yixian Basin, in Western Liaoning Province |
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| LIANG Jun-hong,GONG En-pu,DONG Xu-ming,CUI Xian-de,LI Xiao-dong,WANG Chun-hong.Sedimentary Facies and Palaeoenvironment Analyses on Yixian Formation Bottom Layers of Yixian Basin, in Western Liaoning Province[J].Acta Sedimentologica Sinica,2007,25(4):545-553. |
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| Authors: | LIANG Jun-hong GONG En-pu DONG Xu-ming CUI Xian-de LI Xiao-dong WANG Chun-hong |
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| Institution: | Geology Department of Northeastern University, Shenyang, 110004 |
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| Abstract: | Mashenmiao and Laogonggou sedimentary strata develop as the bottom of early Cretaceous Yixian Formation in the Yixian basin,western Liaoning province.Mashenmiao sedimentary stratum,which forms under arid palaeoclimate,could be divided into 6 sublayers from the lower to the upper portion,the lower conglomerate sublayers come into being proluvial fan bottom facies and fan surficial streamflood filled facies;the middle part of Mashenmiao layers is ployenous conglomerate containing tuffaceous interlayer;mesotypic-basic vulcanite overlay Mashenmiao sedimentary deposit.The Laogonggou bottom is politic siltstone distal facies of alluvial fan and gritstone-pebbly gritstone alluvial facies of proluvial fan to basin centre part,the latter is formed by ephermeral stream's fluviation.Bentonitic siltstone and bentonite-carbonate rock sedimentary deposit are aggraded as the top of Laogonggou stratum;it is a shallow lacustrine sedimentary set.In the initial stage of basin evolution,regional climate is arid and basin margin has high hypsographic feature.There are proluvial fans around basin margin,the flood stream sedimentary process occur on fan surface.In the transition part of fan to lacustrine,there are ephemeral streams;the top facies of Laogonggou indicates a palaeogeographic and palaeoclimatic characteristics of regional aridity,intensive volcanic eruption and lacustrine water-depth fluctuation.The lower sedimentary of Yixian Formation show form basin margin to centre three facies coexistence paleogeography characteristics of planar,linear and relatively quiescence water mass depositions. |
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| Keywords: | sedimentary facies sedimentary paleoenvironment Mashenmiao sedimentary deposit Laogonggou sedimentary deposit Yixian Formation Yixian basin |
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