| 辽西地区义县组岩相古地理特征 |
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| 引用本文： | 韩仁萍,邢德和.辽西地区义县组岩相古地理特征[J].世界地质,2010,29(3):363-391. |
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| 作者姓名： | 韩仁萍 邢德和 |
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| 作者单位： | 1． 辽宁工程技术大学资源与环境工程学院，辽宁阜新123000; 2． 中国地质调查局沈阳地质矿产研究所，沈阳110032 |
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| 基金项目： | 区域地质大调查K51E014004(北票市)等四幅区域地质调查 |
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| 摘 要： | 义县组广泛发育于辽西地区晚中生代盆地中,为一套以陆相火山喷发为主,夹多层沉积岩层的火山--沉积岩系。其沉积层中富含热河生物群化石。通过岩相古地理和火山岩相等研究方法,把义县组自下而上分为4个岩性段,各段的岩相特征为:一段主要为河流相,由复成分细砾岩组成;二段湖泊相广泛分布,形成了一套含珍稀化石的湖相沉积层;三段以河流相为主;四段为湖泊相、河流相和冲积扇相,均小面积发育。4个岩性段均不同程度发育火山岩相(包括各火山亚相)。与土城子期对比,义县期的古地貌不会高于土城子时期,古水流主要来自火山盆地坳陷湖的四周。
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| 关 键 词： | 义县组 热河生物群 岩相古地理 辽西 |
Characteristics of lithofacies palaeography of Yixian Formation in western Liaoning |
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| HAN Ren-ping,XING De-he.Characteristics of lithofacies palaeography of Yixian Formation in western Liaoning[J].World Geology,2010,29(3):363-391. |
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| Authors: | HAN Ren-ping XING De-he |
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| Institution: | 1． College of Resources and Environment Engineering，Liaoning Technical University，Fuxin 123000，Liaoning，China; 2． Shenyang Institute of Geology and Mineral Resources，China Geological Survey，Shenyang 110032，China |
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| Abstract: | Yixian Formation,widely exposed in Late Mesozoic basin of western Liaoning Province,is mainly a series of volcanic-sedimentary formation including some sedimentary intercalation,and bearing aboundant Jeho Biota fossils.According to research method of lithofacies paleogeography and volcanics facies,the Yixian Formation can be subdivided into 4 members,and their lithofacies are as follows：the first subcycle composed of polymictic conglomerate beds is chiefly developed in river facies.Lacustrine facies is broadly distributed in the second subcycle,formimg a set of lake sediments with rare fossils.The third one showed mainly river facies.The fourth member of Yixian Formation in mainly consists of lake facies,river facies and alluvial fan facies.They developed in small area.All of the lithologic members are composed of volcanics facies（including volcanics subfacies）.Through comparing with Tuchengzi age,the ancient relief of Yixian age could not be higher than the former,and paleocurrent is mainly from volcanic basin around downwarped lake.Finally,the ancient geographic environment on different sediment is restored.The study can offer important reference for regional stratigraphic correlation. |
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| Keywords: | Yixian Formation Jeho Biota lithofacies paleogeography western Liaoning |
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