Dynamical Process and Genesis of Late Triassic Sediment Filling in Ordos Basin

作     者：Jiao Yangquan Lu Zongsheng Zhuang Xinguo Yang ShigongFaculty of Earth Resources, China University of Geosciences, Wuhan 430074 

出 版 物：《Journal of Earth Science》 (地球科学学刊（英文版）)

年 卷 期：1997年第16卷第1期

页      面：45-48页

核心收录：

学科分类：070904[理学-构造地质学] 0709[理学-地质学] 07[理学] 

主　　题：tectonic sequence dynamics Ordos basin Qinling orogen. 

摘      要：Coupling relationship exists in development time of the Qinling orogen and the neighboring Ordos basin, implying that they are connected genetically, that is, the formation and evolution of the Ordos basin are response to orogeny. The present Ordos basin is a residual part of the Late Triassic large Ordos basin. The primary large Ordos basin was featured by four types of boundaries, i.e. (1) southern thrusting boundary; (2) southwestern strikeslip thrusting boundary; (3) northwestern rifting boundary; and (4) northeastern and northern passive gentle slope type boundary. This basin was composed of sequences A and B. These sequences consist of three parts, i.e. lower alluvial systems tract, middle expanding lacustrine systems tract and the upper contracting lacustrine systems tract. A systems tract is actually a parasequence set. Based on division of sequences stratigraphic units and reconstruction of depositional systems tracts, the present paper proposes that: (1) two episodes occurred during Late Triassic Qinling collision orogeny; (2) collision is stronger in western Qinling than in eastern Qinling.