29 3 2010 9 GLOBAL GEOLOGY Vol. 29 No. 3 Sept. 2010 1004-5589 2010 03-0363 - 10 1 2 1. 123000 2. 110032-4 4 P531 A doi 10. 3969 /j. issn. 1004-5589. 2010. 03. 002 Characteristics of lithofacies palaeography of Yixian Formation in western Liaoning HAN Ren-ping 1 XING De-he 2 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 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. Key words Yixian Formation Jeho Biota lithofacies paleogeography western Liaoning - 2010-05-16 2010-09-02 K51E014004 J4. 1. 12
364 29 1 ~ 2 20 40 1-11 1 1 2 4 4 1 - - - - - 2 ~ 3 -
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366 29 NW 10 ~ 60 5 ~ 15 SE 260 30 SW NEE SW SE CO 2 SW SE 2 3-3. 2 - - - 3 3. 1 - SE NW - 4 NE
3 367 Fig. 2 2 Second subcycle sedimentary characters of Yixian Formation in Jinlingsi -Yangshan Basin of Sihetun area
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3 369 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. - 34. 35. 36. Fig. 4 4 Lithofacies palaeogeography map of the first subcycle of Yixian Formation 4 - -
370 29 - - 5 Fig. 5 5 4 Lithofacies palaeogeography map of the second subcycle of Yixian Formation 4 6 1 - - -
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