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Latest Pleistocene 'Blue Unit' of the Mississippi fan system, Gulf of Mexico

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Authors:Bjerstedt, Thomas W.; Kody, Kramer; Shedd, William W.
Author Affiliations:Primary:
U.S. Department of the Interior, Bureau of Ocean Energy Management, New Orleans, LA, United States
Volume Title:66<sup>th</sup> annual convention of the Gulf Coast Association of Geological Societies, American Association of Petroleum Geologists Sectional Meeting; and the 63<sup>rd</sup> annual meeting of the Gulf Coast Section of the Society of Economic Paleontologists and Mineralogists
Volume Authors:Smith-Engle, Jennifer M., editor; editor
Source:Transactions - Gulf Coast Association of Geological Societies, Vol.66, p.915-916; 66>th` annual convention of the Gulf Coast Association of Geological Societies American Association of Petroleum Geologists Sectional Meeting; and 63>rd' annual meeting of the Society of Economic Paleontologists and Mineralogists, Gulf Coast Section, Corpus Christi, TX, Sept. 18-20, 2016, Jennifer M. Smith-Engle and editor. Publisher: Gulf Coast Association of Geological Societies, New Orleans, LA, United States. ISSN: 0533-6562
Publication Date:2016
Note:In English
Summary:Shallow water flow events in the central Gulf of Mexico that have caused drilling complications define the approximate areal extent of an Upper Pleistocene fan-channel sequence termed the 'Blue unit' by shallow geohazard interpreters in the Mississippi Canyon protraction area. Mapping on 3D time volumes has established that the Blue unit can be traced throughout the Mississippi Canyon, Atwater Valley, DeSoto Canyon, and Lloyd Ridge protraction areas. The Blue unit is a low-stand system deposited during the Wisconsin glaciation (marine isotope stage [MIS] 4) approximately 71 kya. It is interpreted with a lower canyon-cutting facies, and an upper sheet sand facies depositedin the channel and in ponded overbank areas formed between salt diapirs. A deep canyon was cut in the shelf edge during the MIS 4 low stand with the knickpoint centered on the South Pass Southeast Area. The canyon trends south-southeastand was apparently diverted east-southeast by rising salt diapirs. Where the Blue unit is present near the modern Mississippi Canyon it is less organized and dominated by mass transport deposits. Here it is also highly deformed by salt diapirism and erosional beheading by younger channel systems. Erosion and canyon incision in northwestern Mississippi Canyon grades eastward into a fan system deposited on the basin plain. Farther southeast in the Elbow area of the eastern Gulf of Mexico to the current limit of 3D data coverage the Blue unit can be genetically linked to a well-organized meandering channel-levee system along the toe of the Florida Escarpment. Abandonment of the meandering system resulted from sea level rise at MIS 2 (29 kya) and updip channel avulsion that diverted sediment to create younger channel-fan complexes to the southwest, most notable of which is the modern Mississippi Fan.
Subjects:Cartography; Cenozoic; Lowstands; Pleistocene; Quaternary; Shallow-water environment; Three-dimensional models; Upper Pleistocene; Atlantic Ocean; Gulf of Mexico; Mississippi Fan; North Atlantic
Coordinates:N234700 N284500 W0843000 W0911500
Record ID:816386-112
Copyright Information:GeoRef, Copyright 2021 American Geosciences Institute.
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