- 责任者：Qiu Xinwei (State Key Laboratory of Isotope Geochemistry ; Guangzhou Institute of Geochemistry ; CAS ; Guangzhou 510640 ; China) ; Liu Chiyang
- 刊名：Chinese Journal of Geology
- 出版年：2013
- 卷期：48(1)
- 关键词：同沉积作用 ; synsedimentary processes ; 软沉积物变形 ; soft sediment deformation ; 鄂尔多斯盆地 ; Ordos Basin
- 页码：p.204-216
- 图表：illus., 23 refs.
- 分类号：0803
- issnNo：ISSN0563-5020
- isbnNo：CN11-1937/P
Various synsedimentary deformation structures are found in deep lake zone through detail study on outcrop and core sections of Upper Triassic Yanchang Formation in Ordos Basin. Syndepositional sandstone dikes, ridges, veins, minor faults and folds are found in outcrops section; Sandstone rumpled structures, sand muddy breccia structures, minor faults and sandstone veins are found in cores, based on the detail descriptive characteristics and analysis these structures of sequence, we propose a paleoseismic trigger to explain the various synsedimentary deformation structures, and the paleoearthquakes induced sand body at delta front along slope slump, a lot of flame structures and Bouma sequence are found. Detailed study of its distribution characteristics of that seismites and volcanic ash sediments in temporal is almost the same period in development; Slump turbidite formed after seismites and volcanic ash sediments, indicating that earthquakes, volcano eruption or deep thermal effect led to the basin basement subsidence, increasing in terrain elevation and later seismic prompted the formation of turbidites. Synsedimentary deformation structures are mainly locating in south and southwest of Ordos Basin, and the intensity decreased from southwest to northeast. Comprehensive comparison the same period adjacent orogenic belt evolution and the distribution characteristics of synsedimentary deformation structures in deep lake, suggest synsedimentary deformation structures coupled response of the Qinling collision orogenic process and deep heat effect, indicating a deep lacustrine corresponds to the basin with a relative activity dynamics setting, which played an important role in development of high-quality hydrocarbon source rocks.