External Controls on Deep-Water Depositional Systems
The principal objective of the meeting from which this set of papers arose was to gain an overview of the current state of knowledge of the roles and interplays of external controls on deposition in deep marine environments. By external controls we mean allocyclic or allogenic factors, i.e., those that are unrelated to the self-organization of the depositional system (autocyclic or autogenic); principal among these are climate, sea level, sediment supply, and tectonics. One of the big questions that the meeting sought to address concerned the comparability of the recent high-frequency, high-resolution record with the older, generally lower-frequency stratigraphic record of “deep time”; to what extent are the apparent differences a function of resolution, or of comparisons between a glacial and a nonglacial Earth? In fact, as the papers in this volume illustrate, the variability between individual systems, even in Late Glacial time, and the paucity of constraints on older systems makes these questions difficult to answer, but some useful conclusions can be drawn. The papers presented at the meeting were organized into themes that included: overviews of glacial sea-level change, and of climate modeling; external controls on large river-fed submarine fans, including the effects of climate and sea level on the fluvial system itself; influences of climate, sea level, and tectonics on a range of smaller modern systems; deep marine processes; the outcrop record of the pre-Pleistocene Earth; the subsurface record of the pre-Pleistocene Earth; and syntheses. The organization of the volume largely reflects this structure.
Climate Change, Sea-Level Change, and Fluvial Sediment Supply to Deepwater Depositional Systems
Published:January 01, 2009
Michael D. Blum, Jill Hattier-Womack, 2009. "Climate Change, Sea-Level Change, and Fluvial Sediment Supply to Deepwater Depositional Systems", External Controls on Deep-Water Depositional Systems, Ben Kneller, Ole J. Martinsen, Bill McCaffrey
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Deepwater depositional systems are in most cases ultimately fed by rivers that deliver sediment from the hinterland to the continental margin. Fluvial systems therefore provide the link between processes that control sediment supply to the margin and processes that control dispersal to deepwater. This paper reviews controls on fluvial sediment supply to the shelf-margin staging area over time scales of 106 yr or less.
General controls on fluvial sediment discharge to the coastal oceans are reasonably well known: the newly published global database and empirical model of Syvitski and Milliman (2007) shows that geologic factors of drainage area,...