Depositional Characteristics of Early Cretaceous Huixian-Chengxian Basin in Western Qinling Mountains and Their Structural Significance

详细信息   

• 责任者：Zhang Yingli (Institute of Mineral Resources ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Wang Zongqi
• 刊名：Geological Bulletin of China
• 出版年：2012
• 卷期：31(7)
• 关键词：沉积环境 ; sedimentary environment ; 秦岭 ; Qinling Mountains
• 页码：p.1142-1154
• 图表：6 illus., 1 table, 33 refs.
• 分类号：0803
• issnNo：ISSN1671-2552
• isbnNo：CN11-4648/P

摘要

The Huixian-Chengxian （Huicheng） Basin is a well-preserved pull-apart basin in the western Qinling orogenic belt. There exist various depositional sedimentary lithofacies that show obvious spatial variations. The sedimentary evolution of Huicheng Basin can be divided into four stages. The first stage was characterized by minor sediments of Tianjiaba Formation, and the second stage by basin expansion of Zhoujiawan Formation. The third stage of early Jishan Formation was a maximum basin and the fourth stage had features of sedimentary infilling.  Sediments were mainly derived from granite and pre-Jurassic rocks in the north and the south,as indicated by restored paleo-current directions and provenance. Tectonic subsidence and sedimentation were primarily controlled by the Huifeng border faults on the northern margin of the basin. The uplift of pre-Jurassic rocks resulted from the tilting of border faults, and this area became the main provenance area.