Cenozoic Deformation Characteristics and Controlling Factors of Kalayuergun Structural Belt, Kuqa Fold and Thrust Belt, Southern Tianshan
详细信息
- 责任者：Li Shiqin (School of Resources and Environment ; Southwest Petroleum University ; Chengdu 610500 ; China) ; Tang Pengcheng
- 刊名：Earth Science
- 出版年：2013
- 卷期：38(4)
- 页码：p.859-869
- issnNo：ISSN1000-2383
- isbnNo：CN42-1233/P
摘要
Kalayuergun structural belt (KSB) is the deformation leading edge of Kuqa fold and thrust belt, southern Tianshan, whose subsurface deformation characteristics is still unclear. Based on field observations, digital elevation model, well data and high-quality 2D seismic reflection profiles, we explore the distribution, geometry, kinematics and deformation age of anticlines in the KSB. Combined with the results of previous studies, the deformation controlling factors of the KSB are discussed. KSB extending E-W for about 165 km, is a typical compressional structural belt, which is characterized by five elongate anticlines, including Beika, Zhongka, Nanka, Yangtage and Yingmaili anticlines, as well as several blind thrust faults developed at the core of anticlines. Cenozoic deformation characteristics of the KSB are summarized as the following five aspects: (1) Beika anticline is a salt pillow structure; (2) Asymmetric Zhongka and Nanka anticlines have opposite structural vergence, while a displacement transfer zone was formed between them; (3) Yangtage and Yingmaili anticlines are symmetric, low-amplitude detachment folds; (4) The amplitude of anticlines decrease gradually from west to east; (5) The deformation ages were youngling eastward progressively. The results of this study reveal that the major controlling factors of Cenozoic deformation in the KSB are regional compression, salt layer and basement structures.