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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:

2009年第03期

Page:

254-259

Research Field:

基础地质与矿产地质

Publishing date:

Info

Title:

Characteristic of the Flora in the Zhenzhuchong Formation and the Jurassic-Triassic Boundary in the Sichuan Basin

Author(s):

LIU Di-di¹;  YANG Zi-rong¹;  YANG Yan-dong²;  BAO Ying-ying¹;  LIU Bao²

(1.Department of Mineral Resource Survey and Exploration, Liaoning Technical University, Fuxin 123000,Liaoning, China; 2.Institute of Exploration and Development, Liaohe Oilfield Company, China NationalPetroleum Gorporation, Panjin 124010, Liaoning, China)

Keywords:

flora;  the Zhenzhuchong Formation;  the Xujiahe Formation;  the boundary between the Triassic and the Jurassic;  the Sichuan Basin

PACS:

P931.2

DOI:

-

Abstract:

The fossil plants of 7 categories 50 genera 128 species from the Zhenzhuchong Formation and 10 categories 71 genera 267 species from the Xujiahe Formation are studied, and flora of the Zhenzhuchong Formation is divided into upper assemblage and the lower assemblage. Through analyzing the flora development characteristic and evolution from Zhenzhuchong Formation and Xujiahe Formation, and referencing related information of the area, the authors determine the boundary between the Jurassic and the Triassic in Sichuan Basin. For the area which is in the front of the Dabashan Mountains in the northern of the Sichuan Basin, the boundary between the Triassic and the Jurassic in either the deceptive conformity surface or the plane of denudation with bottom quartz conglomerate or silicarenite in the Zhenzhuchong Formation containing Coniopteris fossil according to lithology and the flora features from the Zhenzhuchong Formation(the Baitianba Formation). For the areas of Yunyang, Fengjie in the northeast of the Sichuan Basin and Wanxian in the south of Yangtze River, the boundary between the Triassic and the Jurassic is located in the bottom of yellow-green pelitec silstone with powder sandy mudstone which is 8.3 m under the layer containing Coniopteris murrayana fossil in the Zhenzhuchong Formation in the Nanxi section of Yunyang County.

References:

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Last Update: 2009-09-20