| 摘要: |
| 当前沉积学界发现和认识了一些新类型的沉积流体,如风暴流、等深流,使我们对沉积流体的认识提高到一个新的阶段。但是这些新沉积流体的搬运机理和沉积作用尚无明确的统一认识,主要是因为我们发现的古代实例不多,而且对现代海洋类似流体研究还不够完善。本文作为一个具体实例报道古代等深流沉积岩,并从沉积构造角度探讨其形成机理,初步建立等深积岩理想沉积模式。 |
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| Contourites and Their Sedimentary Model in the Lower Triassic Daye Formation,in Southern Hunan Province |
| Wu Jianbai |
| (Regional Geological Survey, Hunan Bureau of Geology and Mineral Resources) |
| Abstract: |
| It is the first time to discover contourites in Hunan Province, China. The main sedimentary structures in the contourites include convergent cross-bedding, flyschoid bedding and contour current marks. This paper deals with the vertical changes in physical and chemical properties of water bodies in deep-water zone, which are responsible for the formation of ordered structures, i. e., a series of graded beds and mutation beds. The different flow regimes of contour currents can give rise to distinct sedimentary structures which are ascribed by the author to the structural beds on the basis of the mechanism for the formation of the sedimentary structures, thus resulting in the establishment of a tentative sedimentary model for the contourites. Furthermore, the author suggests in the study that flyschoid bedding may be included in the sedimentary structures in contour current deposits, so that the implications for contour currents may be extended. This is of special theoretical significance. |
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