Experimental sequence stratigraphy of submarine fans on the basis of the theory of shoreline autoretreat

目前的研究是调查深水，粗粒碎屑环境的发展是如何与海岸线自动后退。这一问题已通过水槽实验和理论研究得到解决，总结如下：深水碎屑沉积体系对岸线自动后退反应敏感，在高位体系域发育期间，河流三角洲不可能跨越陆架数百公里。即使三角洲的生长有无限的时间，三角洲的扩展也有明显的限制，这是由于在相对海平面上升期间三角洲发展中的一种内在机制（“自动破碎”）。海侵作用的终止点可能远离陆架边缘向陆。控制三角洲扩张界限和自裂事件发生时间的主要因素包括陆架宽度、沉积物供给速率、相对海平面上升速率以及三角洲和陆架的几何参数。不是ABS ...更多信息 绝对不可能在相对海平面略微上升的情况下形成陆架边缘三角洲。然而，静止和下降的相对海平面更有利于陆架边缘三角洲的发展和砂供应到深海区，在三角洲的旅行时间到陆架边缘。因此，本研究支持传统层序地层学解释中认为富砂深海体系在相对海平面下降和低位时最易发育的观点，并从岸线自动后退理论出发，全面认识了河流三角洲对稳定强迫的自生响应。此外，自动切割和自动断开都表示三角形必须失去其原始几何形状的时刻。任何一种自台阶和自生阶地的形成都是岸线自后退原理与自旋回性相结合的结果。动力条件的异周期变化只会增强或减弱三角洲系统的内建过程。少

The present research was to investigate how the development of deep-water, coarse-grained clastic environments is related to shoreline autoretreat. This problem has been solved by means of flume experiments and theoretical examinations, summarized as below.Deepwater clastic depositional systems can respond sensitively with shoreline autoretreat River deltas cannot prograde over hundreds of kilometers across their shelves during the interval of highstand systems tract development. Even if unlimited time is available to delta growth, there is a clear limit in delta progradation owing to a mechanism ('autobreak') inbuilt in a delta evolving during relative sea-level rise. The termination of the progradation may be far landward of shelf edge. The main factors controlling the limit of delta progradation and the occurrence time of the autobreak event include shelf width, rate of sediment supply, rate of relative-sea level rise, and geometrical parameters of the delta and shelf. It is not abs … More olutely impossible for shelf-edge deltas to be built during slightly rising relative sea level. However, stillstand and falling relative sea level much favor the development of shelf-edge deltas and of sand supply to deep-marine areas, in terms of the delta's travel time to shelf edge. The present study therefore supports the maintenance of the conventional sequence stratigraphic interpretation that sand-rich deep-marine systems are most easily developed during falling and lowstand of relative sea level.A comprehensive understanding of the autogenic response of fluvial deltas to the steady forcing is provided from the theory of shoreline autoretreat. Besides, both autoincision and autobreak represent the moment at which the delta has to lose its original geometry. Any of autostepping and autogenic terrace formation comes out from the effect of the principle of shoreline autoretreat combined with its autocyclic behavior. Allocyclic changes of dynamic conditions only enhance or reduce the inbuilt process of delta systems. Less