• 责任者：Xue Peilin (Key Laboratory of Exploration Technologies for Oil and Gas Resources ; Ministry of Education ; School of Geosciences ; Yangtze University ; Jingzhou 434023 ; China) ; Kuang Hongwei
• 刊名：Geological Bulletin of China
• 出版年：2013
• 卷期：32(2/3)
• 关键词：盆地演化 ; basin evolution ; 沉积相 ; sedimentary facies ; 甘肃 ; Gansu Province
• 页码：p.476-487
• 图表：illus., 2 tables, 40 refs.
• 分类号：0803
• issnNo：ISSN1671-2552
• isbnNo：CN11-4648/P

Jiuquan Basin is a composite basin which experienced rifting and depression stages in the Early Cretaceous. The basin experienced the evolution phases of rifted basin in the Early Cretaceous and foreland basin in the Cenozoic. Affected by the joint action of Siberia plate, Pacific plate and India plate as well as the thermal event in depth, Jiuxi area was in an extensional rifting phase during the Early Cretaceous. The sediments can be divided in upward succession into Chijinqiao Formation, Chijinpu Formation, Xiagou Formation and Zhonggou Formation. The strata are thick in the southwest and thin in the north. Studies of the sedimentary facies show that the Xiagon and Zhonggou Formations were mainly characterized by the coarse clastic rock in foreland of mountain, fluvial sandstone and lacustrine mudstone, and coarse-fine-coarse and coarse-fine sedimentary successions comprised the Xiagou Formation and the Zhonggou Formation respectively. The Xiagou Formation developed lacustrine-braided fluvial delta facies and basic volcanic rocks, corresponding to the maximum rifting degree, whereas the Zhonggou Formation developed fluvial fan-meandering river facies, corre- sponding to the shrinkage of the depression. Studies show that the lake was deep in southwest Jiuquan basin while shallow in northern Jiuquan basin in the Early Cretaceous. The center of subsidence and depocenter were located in the Changma-Hanxia area, dominated by lacnstrine deposits; the north border was in Xinminpu-Hongliuxia area, dominated by delta-shallow lake deposits. In a word, the characteristics of sedimentary successions and sedimentary environments of the lower Cretaceous strata in Jiuxi area indicate a complete tectonic cycle starting with embryonic rifting stage （Chijinqiao Formation and Chijinpu Formation）, followed then by extensional rifting stage （Xiagou Formation） and finally by depression shrinkage stage （Zhonggou Formation）.