Principles of regression and transgression; the nature of the interplay between accommodation and sediment supply

Abstract

Other| November 01, 1997 Principles of regression and transgression; the nature of the interplay between accommodation and sediment supply Tetsuji Muto; Tetsuji Muto Nagasaki University, Department of Geology, Nagasaki, Japan Search for other works by this author on: GSW Google Scholar Ron J. Steel Ron J. Steel University of Wyoming, United States Search for other works by this author on: GSW Google Scholar Author and Article Information Tetsuji Muto Nagasaki University, Department of Geology, Nagasaki, Japan Ron J. Steel University of Wyoming, United States Publisher: SEPM Society for Sedimentary Geology First Online: 03 Mar 2017 Online ISSN: 1938-3681 Print ISSN: 1527-1404 GeoRef, Copyright 2008, American Geological Institute. Journal of Sedimentary Research (1997) 67 (6): 994–1000. https://doi.org/10.1306/D42686A8-2B26-11D7-8648000102C1865D Article history First Online: 03 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Tetsuji Muto, Ron J. Steel; Principles of regression and transgression; the nature of the interplay between accommodation and sediment supply. Journal of Sedimentary Research 1997;; 67 (6): 994–1000. doi: https://doi.org/10.1306/D42686A8-2B26-11D7-8648000102C1865D Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyJournal of Sedimentary Research Search Advanced Search Abstract The rate of change of accommodation (at the shoreline) [ A ] and the rate of sediment supply [ S ] are the primary factors controlling regression and transgression in the geological record, or retreat and advance of a coastal depositional system. The generally accepted notion, here referred to as the A/S ratio concept, stating that the migration of a shoreline is controlled principally by the magnitude of the ratio of A to S is insufficient and somewhat misleading, partly owing to the problem of dimensional confusion. The interplay of A and S inevitably results in autoretreat of the shoreline, whereby the seaward advance of any shoreline is halted and is subsequently turned to landward retreat, provided there is a continuous rise of relative sea level. How effective the autoretreat process is depends, for a given period of relative sea level rising, upon the length of potential time period for the seaward advance of shoreline, and is proportional to A 2 / S and A (super 1.5) / S (super 0.5) in two- and three-dimensional sediment dispersal modes, respectively. Autoretreat becomes more effective as A increases and/or S decreases: A functions more critically to the effectiveness than S does. The A/S ratio concept is only approximately applicable when autoretreat is less effective (i.e., with very low A and/or very high S ). In this sense, the autoretreat theory and the A/S ratio concept are complementary to each other. The autoretreat mechanism is expected to be substantially useful not only in fluvial deltas but also in many other depositional systems (e.g., barrier islands) whose evolution has been considered in terms of the A/S ratio concept. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.