[an error occurred while processing this directive] ������� 2010, 29(3) 363-391 DOI:     ISSN: 1004-5589 CN: 22-1111/P

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Article by Han, R. P. 1
Article by Xing, D. H. 2
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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��

Keywords: Yixian Formation   Jeho Biota   lithofacies paleogeography   western Liaoning  
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