- 责任者：Li Lin (Institute of Geology and Geophysics ; Chinese Academy of Sciences ; Beijing 100029 ; China) ; Qu Yongqiang
- 刊名：Acta Sedimentologica Sinica
- 出版年：2011
- 卷期：29(4)
- 关键词：重力流沉积 ; gravity flow deposit
- 页码：p.677-688
- 图表：6 illus., 1 table, 71 refs.
- 分类号：0803
- issnNo：ISSN1000-0550
- isbnNo：CN62-1038/P
As an important sedimentary phenomenon, gravity flow sedimentation is widespread in deep-marine and deep-lacustrine environments. Obviously, differentiation of different types of gravity-flow sediments is crucial for reconstructing paleo-depositional environment. Four distinct types of gravity flows and their diagnostic sedimentary structures are introduced, which can be used as guide for field identification. Debris flow depositions are characterized of their disorganized internal texture, flat bed base, and parallelism of planar clasts to bedding. Thick-bedded and massive sandstones are usually formed by hyperconcentrated density flow; typified by occurrence of out-sized clasts, rip-up mudstones, water escape structures and other liquefaction-related structures. Grain flow is a subtype of hyperconcentrated density flows, and inverse grading is characteristic of its deposits.