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Post-Jurassic sedimentary history of the Eastern Gulf of Mexico
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|Author Affiliations:||Primary: |
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.759-762; 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|
|Note:||In English. Extended abstract. 2 refs.; illus., incl. sketch map|
|Summary:||Using an extensive 2D seismic grid (Fig. 1), nine depositional episodes (depisodes) bounded by marine flooding surfaces have been defined for the Mesozoic-Cenozoic section in the eastern Gulf of Mexico Basin. Spatial and temporal variations of each sequence reveal basin sedimentary history. These observed sequence depositional patterns reflect the imprint of the global sea-level changes. The sedimentation rate (Fig. 2) was relatively low during the Jurassic depisode (672 ft/m.y.), and the depocenter was in the Destin Salt Basin in the north-northwest. The rate successively decreased in the Early-Early Cretaceous and Late-Early Cretaceous depisodes (242 and 551 ft/m.y.) with depocenters in the Destin Salt and Tampa basins. The Late Cretaceous depisode has a significantly-decreased sedimentation rate (143 ft/ m.y.) and the main depocenter filled the West Florida Basin. Sedimentation rate slightly increased until the Paleogene depisode (152 ft/m.y.). Depocenters of the Paleogene depisode occurred entirely landward of the present shelf edge in the Tampa Basin. Sedimentation rate increased at the beginning of the Early to Middle Miocene depisode (416 ft/ m.y.), shifting the depocenters into Main Pass and Mississippi Canyon areas. Sedimentation rate dramatically increased in the Late Miocene depisode with depocenter occurring primarily in the Mississippi Canyon and Main Pass areas seaward of the present shelf edge. Sedimentation rate increased to 2614 ft/m.y. in the Pliocene and depocenter shifted further basinward relative to the Miocene depisodes and filled the Mississippi Canyon. Sedimentation rate currently is at its Cenozoic maximum (5764 ft/m.y.) and the depocenter has moved further south and southeast and is filling the West Florida Basin. Mapping of depocenters of individual depisodes reveals the sedimentary history of eastern Gulf Basin (Fig. 3). Depocenter distribution patterns reflect sediment source origin and global sea level change. From the Jurassic depisode to the Paleogene depisode, the depocenters are primarily located landward of the present shelf edge related to the relative dominance of northern and northeastern clastics sources and highstand global sea level. The presence of a depocenter in the West Florida Basin in the Late Cretaceous depisode suggests periods of lowstand sea level. After the Paleogene depisode, the depocenters progressively shifted basinward and appeared mainly seaward of the present shelf edge. The migrations indicate a lowstand global sea level due to the growth of Antarctic and Northern Hemisphere ice sheets and increase of tectonic subsidence (Miller et al., 2005). The northwestern clastic sediment source became dominant after Early Miocene. The variation of sedimentation rate reflects tectonic subsidence and sealevel history in the eastern Gulf Basin.|
|Subjects:||Cenozoic; Depositional environment; Geophysical methods; Jurassic; Mesozoic; Sea-level changes; Sedimentation; Sedimentation rates; Sedimentology; Seismic methods; Two-dimensional models; Atlantic Ocean; Gulf of Mexico; Gulf of Mexico Basin; North Atlantic|
|Coordinates:||N240000 N300000 W0820000 W0890000|
|Copyright Information:||GeoRef, Copyright 2019 American Geosciences Institute.|
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