Coastal Depositional Systems, Northwest Gulf of Mexico: New by John R. Suter, Robert A. Morton, Shea Penland

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By John R. Suter, Robert A. Morton, Shea Penland

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Published via the yank Geophysical Union as a part of the Field journey Guidebooks Series.

smooth depositional environments displayed alongside the northwestern Gulf of Mexico have been the 1st largely accredited sedimentary facies types, and effectively guided exploration and creation of a number of power and nonfuel assets, corresponding to petroleum, lignite, uranium, geothermal strength, development mixture, and groundwater. simply because those commercial actions either required and supplied a major database, the depositional environments of the Gulf Coast are probably the greatest identified wherever. This guidebook describes chosen beneficial properties of the northwestern Gulf of Mexico coastline, starting from the fashionable Mississippi delta and Louisiana coastal undeniable to the overdue Holocene and Pleistocene sediments of Texas. the sphere stops show a spectrum of transgressive and regressive sequences coexisting alongside a microtidal storm-dominated coast present process an important relief in sediment offer (both usual and human-induced) and a mild sea point upward thrust.

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Additional info for Coastal Depositional Systems, Northwest Gulf of Mexico: New Orleans, Louisiana to Houston, Texas, July 21-25, 1989

Example text

Beneath these transgressive deposits lie regressive distributary and beach-ridge deposits, which supplied sands for the development of the Isles Dernieres. The Isles Dernieres here consist of a sequence 2-3 m thick of recurved spit sands overlying a sequence of lagoonal muds 2 m thick. Within the Isles Dernieres, Whiskey Pass and Coupe Carmen are shallow, wave-dominated inlets with well-developed, flood-tidal delta sand bodies 1-2 m thick (Neese, 1984; Penland et al. 1985). Maximum channel depths are 3-5 m.

The hurricane protection levee withstood Hurricanes Danny and Elena in 1985. However, in the last stages of Hurricane Juan, the levee failed at its western end,. resulting in minor overwash damage to a small trailer park. The area of failure was the last part of the levee to be finished and vegetated and lies just onshore of several large dredge holes from which borrow material was obtained. A 1,OOO-m section of the levee was completely removed, and many other areas suffered extensive scouring.

FIGURE 41 The Five Islands salt dome trend of Louisiana (after Kupfer, 1986). 1. HORIZONTAL PHASE Surfac;-;r - Stop 13. -JI-----------~~- northwest -edge of the island, but it is inaccessible. Some roads are open to the public, mainly La. 83 (loop road from New Iberia to Baldwin, Louisiana), which crosses the east flank of the mound, but the salt mining and SPR areas are closed. Several natural-collapse lakes can be seen along the east side, with nesting egrets in season. From the higher points one can see the small rises in vegetation that mark the Avery and Cote Blanche "islands" 12 km to the northeast and southwest.

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