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Sedimentary Facies and Genesis of Holocene Sand Banks on the East Texas Inner Continental Shelf

By
Antonio B. Rodriguez
Antonio B. Rodriguez
Department of Geology and Geophysics, Rice University, Houston, TX 77005, U.S.A.
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John B. Anderson
John B. Anderson
Department of Geology and Geophysics, Rice University, Houston, TX 77005, U.S.A.
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Fernando P. Siringan
Fernando P. Siringan
University of the Philippines, Quezon City, Philippines
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Marco Taviani
Marco Taviani
Istituto per la Geologia Marina, Via Zamboni 65, 40127 Bologna, Italy
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Published:
January 01, 1999

Abstract

Sediment cores and high-resolution seismic and side-scan sonar data were collected from four shelf banks on the east Texas inner continental shelf. Sabine, Heald, Shepard, and Thomas banks all have similar sediment facies, structure, and genesis. The banks are composed of three facies (top to bottom): A) an interbedded shell hash and sand unit; B) a muddy-sand unit characterized by a seaward-prograding and chaotic seismic facies, and C) an interbedded sand and mud unit characterized by landward-dipping seismic reflectors. These three sediment facies represent amalgamated storm beds, lower-shoreface or ebb-tidal delta, and back-barrier/flood-tidal delta environments respectively. Facies B and C were deposited during a time of relatively slow sea-level rise and were stranded on the shelf during a rapid sea-level rise. Facies A is the result of storms and wind-driven currents reworking the paleoshoreline deposits on the shelf. The banks are drowned paleo-shorelines restricted to the area above and immediately adjacent to the Trinity and Sabine incised fluvial valleys. This association is explained by the greater thickness of sands within the valleys (larger sources of sands), greater accommodation space, and greater subsidence rate within the valleys (greater preservation potential).

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SEPM Special Publication

Isolated Shallow Marine Sand Bodies: Sequence Stratigraphic Analysis and Sedimentologic Interpretation

Katherine M. Bergman
Katherine M. Bergman
Department of Geology University of Regina Regina SK S4S OA2 Canada
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John W. Snedden
John W. Snedden
Mobil Exploration & Producing Technical Center PO Box 650232 Dallas TX 75265USA
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SEPM Society for Sedimentary Geology
Volume
64
ISBN electronic:
9781565761865
Publication date:
January 01, 1999

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