Channel systems and lobe construction in the Mississippi Fan |
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Authors: | Louis E. Garrison Neil H. Kenyon Arnold H. Bouma |
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Affiliation: | (1) U.S. Geological Survey, P. O. Box 6732, 78411 Corpus Christi, TX;(2) Institute of Oceanographic Sciences Wormley, GU8 5UB Surrey, Godalming, U.K.;(3) Gulf Research & Development Company, P. O. Drawer 2038, 15230 Pittsburgh, PA;(4) Present address: Minerals Management Services, P. O. Box 6732, 78411 Corpus Christi, TX |
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Abstract: | Morphological features on the Mississippi Fan in the eastern Gulf of Mexico were mapped using GLORIA II, a long-range side-scan sonar system. Prominent is a sinuous channel flanked by well-developed levees and occasional crevasse splays. The channel follows the axis and thickest part of the youngest fan lobe; seismic-reflection profiles offer evidence that its course has remained essentially constant throughout lobe development. Local modification and possible erosion of levees by currents indicates a present state of inactivity. Superficial sliding has affected part of the fan lobe, but does not appear to have been a factor in lobe construction. |
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