Probability Cumulative Grain-Size Curves of Triassic Flysch Deposits in the Bayankala Mountains Area, Qinghai Province, China

详细信息   

• 责任者：Yang Xinde (Institute of Geomechanics ; Chinese Academy of Geological Sciences ; Beijing 100081 ; China) ; Wang Zongxiu
• 刊名：Geological Bulletin of China
• 出版年：2008
• 卷期：27(4)
• 关键词：复理石 ; flysch ; 粒度分析 ; grain-size analysis ; 巴颜喀拉山 ; Bayankala Mountains
• 页码：p.477-490
• 图表：13 illus., 1 table, 1 plate, 16 refs.
• 分类号：0803
• issnNo：ISSN1671-2552
• isbnNo：CN11-4648/P

摘要

The Bayankala Group consists of flysch deposits. The probability cumulative grain-size curves reveal that: there appear few turbidite-type curves represented completely by the suspension population and the curves are composed principally of the traction and suspension populations. Debris flows are the dominant genetic type of sandstone of the Bayankala Group. Granulometric parameters show that: the average grain size in the Bayankala Basin becomes coarser with time and the sorting becomes better. The features of probability cumulative grain-size curves in different stages of the tempestite sequence are related to the composition of modified sandstone bodies.