| 义县组研究的新认识 |
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| 引用本文： | 邢德和,孙春林,孙跃武,张立东,彭艳东,陈树旺.义县组研究的新认识[J].地球学报,2005,26(1):25-30. |
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| 作者姓名： | 邢德和 孙春林 孙跃武 张立东 彭艳东 陈树旺 |
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| 作者单位： | 吉林大学地球科学学院,吉林长春,130061;沈阳地质矿产研究所,辽宁沈阳,110033;吉林大学地球科学学院,吉林长春,130061;吉林大学地球科学学院,吉林长春,130061;沈阳地质矿产研究所,辽宁沈阳,110033;沈阳地质矿产研究所,辽宁沈阳,110033;沈阳地质矿产研究所,辽宁沈阳,110033 |
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| 基金项目： | 中国地质调查局项目"K51E014004(北票市)等四幅1:5万区域地质调查"(编号:J4.1.12) |
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| 摘 要： | 辽西地区义县组是一套中生代陆相火山-沉积岩系,主要由中-基性火山熔岩、火山碎屑岩及湖泊相(包含少量的河流相)沉积岩构成。依据火山活动的规律性,将义县组划分为4个岩性段,自下而上为：底砾岩 基性-中基性火山岩段;湖相沉积(或称珍稀化石层)岩 中性、酸性火山岩段;基性、中基性-酸性、偏碱性火山岩段和砾岩(包括沉火山角砾岩) 中酸性、偏碱性火山岩段。义县组中包含6个化石层位,其中义县组一段的底砾岩和基性、中基性火山岩的(沉)凝灰岩中产有丰富的以鹦鹉嘴龙为主的古脊椎动物化石;二段的湖相沉积岩中含有大量热河生物群化石,包括著名的中华龙鸟、孔子鸟和辽宁古果等珍稀化石,是义县组的最主要化石产出层位,且湖相化石层基本上为同一时期的产物。根据化石研究和同位素测定结果,将义县组的时代定为早白垩世。
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| 关 键 词： | 义县组 地层 时代 辽西 |
New Knowledge on Yixian Formation |
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| XING De-he,SUN Chun-lin,SUN Yue-wu,ZHANG Li-dong,PENG Yan-dong and CHEN Shu-wang.New Knowledge on Yixian Formation[J].Acta Geoscientia Sinica,2005,26(1):25-30. |
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| Authors: | XING De-he SUN Chun-lin SUN Yue-wu ZHANG Li-dong PENG Yan-dong and CHEN Shu-wang |
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| Institution: | Institute of Earth Sciences, Jilin University, Changchun, Jilin, 130061; Shenyang Institute of Geology and Mineral Resources, Shenyang, Liaoning, 110033;Institute of Earth Sciences, Jilin University, Changchun, Jilin, 130061;Institute of Earth Sciences, Jilin University, Changchun, Jilin, 130061;Shenyang Institute of Geology and Mineral Resources, Shenyang, Liaoning, 110033;Shenyang Institute of Geology and Mineral Resources, Shenyang, Liaoning, 110033;Shenyang Institute of Geology and Mineral Resources, Shenyang, Liaoning, 110033 |
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| Abstract: | The Yixian Formation in western Liaoning Province comprises a set of Mesozoic continental volcanic-sedimentary rocks, which mainly consist of intermediate-basic volcanic lava, volcanic fragmental rock and lacustrine (including a little fluviatile) sedimentary rocks. The formation can be divided into four lithologic members based on the regularity of volcanic activity. From bottom to top, they are the first membei-the basal conglomerate and basic to intermediate basic volcanic member, the second member-the lacustrine sedimentary rock (or called the rare fossil layer) and acid-intermediate volcanic lithologic member, the third member-the basic, intermediate-basic, meta-alkaline volcanic member, and the fourth member-the conglomerate (including sedimentary volcanic breccia) and acid-intermediate, meta-alkaline volcanic member. There are 6 fossil layers in Yixian Formation. The basal conglomerate and basic, intermediate-basic volcanic sedimentary tuff in the first member contains abundant ancient vertebra fossils dominated by Psittacasaurus. The lacustrine sedimentary rock in the second member contains a large number of Jehol Biota fossils including the famous Sinosauropteryxprima, Confuciusornis sauctus and Archaefructus liaoningensis, thus serving as the chief fossils-bearing layer in Yixian Formation. Moreover, all the lacustrine fossil layers are synchronous. The age of Yixian Formation can be assigned to Early Cretaceous. |
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| Keywords: | Yixian Formation stratigraphy age Western Liaoning |
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