Morphology and Sediments of Redondo Submarine Fan, Southern California

Research Article| September 01, 1971 Morphology and Sediments of Redondo Submarine Fan, Southern California BARBARA E HANER BARBARA E HANER Department of Geological Sciences, University of Southern California, Los Angeles, California 90007 Search for other works by this author on: GSW Google Scholar Author and Article Information BARBARA E HANER Department of Geological Sciences, University of Southern California, Los Angeles, California 90007 Publisher: Geological Society of America Received: 22 Jun 1970 Revision Received: 10 Dec 1970 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1971, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1971) 82 (9): 2413–2432. https://doi.org/10.1130/0016-7606(1971)82[2413:MASORS]2.0.CO;2 Article history Received: 22 Jun 1970 Revision Received: 10 Dec 1970 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation BARBARA E HANER; Morphology and Sediments of Redondo Submarine Fan, Southern California. GSA Bulletin 1971;; 82 (9): 2413–2432. doi: https://doi.org/10.1130/0016-7606(1971)82[2413:MASORS]2.0.CO;2 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 SocietyGSA Bulletin Search Advanced Search Abstract Redondo Submarine Fan infills the northern end of the San Pedro basin, one of the inshore fault-controlled basins of the continental borderland off southern California. An analysis was made of detailed echo soundings and sub-bottom seismic profiles by techniques used by geo-morphologists to study segmentation and channel morphology of alluvial fans. This revealed a threefold division of the submarine fan along its axis. These segments are indicated by changes in fan gradient and a channel pattern unique to each segment. The upper fan is steepest, and the channel is entrenched. Intersection of channel with fan surface and meandering characterize the middle segment, while a slightly steeper lower fan gradient results in a braided channel. These geomorphic divisions revealed both proximal and distal facies in the middle segment.Basin slope fault movement is responsible for steepening the upper fan segment to which the active channel responds either by entrenchment or abandonment and creation of a new channel. Turbidity currents are confined solely o t the channel of the upper fan segment, but below the intersection zone they can continue to flow longitudinally within the channel confines or spread laterally over the fan surface. Associated internal sedimentary structures reveal these different deceleration environments.Consideration of the total geometry of sand units, lateral and longitudinal changes in sedimentary facies, and channel morphology provides a model which has greater scope and flexibility than previous sedimentary longitudinal facies models. It can be applied to the vertical changes observed in stratigraphic sections and the distribution of surface sediments on present submarine fans. 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.