Duplex-like structures in submarine fan channels, Ouachita Mountains, Arkansas

Abstract

Research Article| March 01, 1988 Duplex-like structures in submarine fan channels, Ouachita Mountains, Arkansas G. Shanmugam; G. Shanmugam 1Dallas Research Laboratory, Mobil Research and Development Corporation, P.O. Box 819047, Dallas, Texas 75381 Search for other works by this author on: GSW Google Scholar R. J. Moiola; R. J. Moiola 1Dallas Research Laboratory, Mobil Research and Development Corporation, P.O. Box 819047, Dallas, Texas 75381 Search for other works by this author on: GSW Google Scholar J. K. Sales J. K. Sales 1Dallas Research Laboratory, Mobil Research and Development Corporation, P.O. Box 819047, Dallas, Texas 75381 Search for other works by this author on: GSW Google Scholar Author and Article Information G. Shanmugam 1Dallas Research Laboratory, Mobil Research and Development Corporation, P.O. Box 819047, Dallas, Texas 75381 R. J. Moiola 1Dallas Research Laboratory, Mobil Research and Development Corporation, P.O. Box 819047, Dallas, Texas 75381 J. K. Sales 1Dallas Research Laboratory, Mobil Research and Development Corporation, P.O. Box 819047, Dallas, Texas 75381 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1988) 16 (3): 229–232. https://doi.org/10.1130/0091-7613(1988)016<0229:DLSISF>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation G. Shanmugam, R. J. Moiola, J. K. Sales; Duplex-like structures in submarine fan channels, Ouachita Mountains, Arkansas. Geology 1988;; 16 (3): 229–232. doi: https://doi.org/10.1130/0091-7613(1988)016<0229:DLSISF>2.3.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 SocietyGeology Search Advanced Search Abstract Submarine fan channel sequences of the Jackfork Formation (Lower Pennsylvanian) at DeGray Dam section in the Ouachita Mountains, Arkansas, contain discrete units (10-75 cm thick) with moderately dipping (25°-40°), sigmoidal imbricate slices. Adjacent units with opposing imbricate slices are common. The sigmoidal structures are similar in geometry to a tectonic feature known as a duplex. A tectonic origin of sigmoidal structures, however, seems unlikely because opposing directions of imbrication in adjacent units would require an unrealistic tectonic movement history for the area. We propose that the Jackfork sigmoidal structures were formed by a process kinematically similar to that responsible for generating duplex structures. Unlike tectonic duplexes, however, the sigmoidal structures were formed by soft-sediment deformation of sand and mud layers as high-energy sediment gravity flows glided over these layers. Sediment gravity flows, responsible for forming the sigmoidal deformation, were probably generated by slumping of adjacent channel walls. Dip direction of sigmoidal slices is perpendicular to channel axes. Thus, recognition of sigmoidal deformation structures may be useful in inferring the trend of channels in ancient submarine fan complexes. 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.