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

基于海岸线自动后退理论的海底扇层序地层学实验

• 批准号: 12440139
• 负责人: MURO Tetsuji
• 金额: $ 5.38万
• 依托单位: Nagasaki University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12440139/
• 关键词: sequence; shoreline autoretreat; delta; flume experiment; sea-level changes; sediment supply; slope break; subaqueous terraces; 段丘; 海岸線自動後退理論; 水槽実験; 陸棚; 深海堆積系; 陸棚デルタ

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

目前的研究是深水粗粒碎屑环境的发育与海岸线自动退缩之间的关系，通过水槽实验和理论检验解决了这个问题，总结如下。深水碎屑沉积系统可以敏感地响应。海岸线自动后退 在高位体系域发育期间，河流三角洲不能在陆架上前进数百公里。即使三角洲增长有无限的时间，三角洲的发展也存在明显的限制。由于海平面相对上升过程中三角洲内藏的一种机制（“自动断裂”）而导致的进积，进积的终点可能是在远离陆架边缘的地方，这是控制三角洲进积的极限和发生时间的主要因素。自动断裂事件包括陆架宽度、沉积物供应速率、相对海平面上升速率以及三角洲和陆架的几何参数。在相对海平面略微上升的情况下，陆架边缘三角洲是绝对不可能形成的。然而，就三角洲到陆架边缘的移动时间而言，静止状态和相对下降的海平面非常有利于陆架边缘三角洲的发展和向深海区域的沙子供应。传统的层序地层解释认为，相对海平面下降和低位时最容易发育富沙的深海系统。海岸线自退理论为河流三角洲自生响应提供了全面的认识。此外，两者自动切入和自动断裂代表了三角洲必须失去其原始几何形状的时刻，任何自动步进和自生台地的形成都是由于海岸线自动退缩原理与其动态条件的自循环变化相结合而产生的。 Delta 系统的内置流程较少。

项目成果

T.Muto,R.J.Steel: "The 'autostepping' of delta in a transgressive system"2001 American Association of Petroleum Geologists Annual Meeting, Abstracts & Programs. (印刷中). (2001)

T. Muto, R. J. Steel：“海侵系统中三角洲的‘自动步进’”2001 年美国石油地质学家协会年会，摘要和议程（2001 年出版）。

T.Muto: "Autoretreat of shoreline : substantiated in flume experiments"Journal of Sedimentary Research. vol.71(印刷中). (2001)

T.Muto：“海岸线的自动后退：在水槽实验中得到证实”《沉积研究杂志》第 71 卷（出版中）。

Tetsuji Muto: "Shoreline autoretreat substantiated in flume experiments"Journal of Sedimentary Research. 71. 246-254 (2001)

Tetsuji Muto：“水槽实验证实了海岸线自动后退”沉积研究杂志。

Atsushi Urabe: "Lithostratigraphy and depositional history of the Late Cenozoic hominid-bearing succession in the Yuanmou Basin, Southwest China"Quaternary Science Reviews. 20. 1671-1681 (2001)

Atsushi Urabe：“中国西南元谋盆地晚新生代含原始人类序列的岩石地层学和沉积历史”第四纪科学评论。

Tetsuji Muto: "The 'autostepping' of delta in a transgressive system"2001 American Association of Petroleum Geologists Annual Meeting, Abstracts & Programs. A141-A141 (2001)

Tetsuji Muto：“海侵系统中三角洲的‘自动步进’”2001 年美国石油地质学家协会年会，摘要