| 义县组研究的新认识 |
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| 关键词:Yixian Formation stratigraphy age Western Liaoning |
| 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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| New Knowledge on Yixian Formation |
| 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. |
| XING De-he,SUN Chun-lin,SUN Yue-wu,ZHANG Li-dong,PENG Yan-dong,CHEN Shu-wang.2005.New Knowledge on Yixian Formation[J].Acta Geoscientica Sinica,26(1):25-30. |
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