Textural distribution of sea-floor sediments, south Texas Outer Continental Shelf

Shideler, Gerald L.

Abstract:

The general texture of sea-floor sediments along the south Texas Outer Continental Shelf was evaluated in terms of gravel, sand, silt, and clay components. The gravel component is quantitatively minor and is concentrated mainly in the southern sector; it consists, for the most part, of relict biogenic detritus dominated by molluscan shells. The sand component consists of terrigenous and biogenic detritus. Modern sand is localized along the shoreface sector, whereas palimpsest and relict sands characterize the northern and southern sectors, which are the respective locations of the ancestral Brazos-Colorado ‘and Rio Grande deltas. The central sector contains an extensive modern mud blanket that appears to be migrating southward over relict deposits of the ancestral Rio Grande delta. The silt fraction is the highly dominant component of the mud blanket; silt appears to be hydraulically trapped within the shelf environment and constitutes the most abundant detrital component within the Outer Continental Shelf region. The subordinate clay component of the mud blanket is concentrated toward the shelf break and may be largely escaping into deeper water environments.

Genre:

Article

ProdID:

70042740

Citation Author:

Shideler, Gerald L.

Citation Contributing Office:

Coastal & Marine Geology Program

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Citation End Page:

713

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Citation Language:

English

Citation Larger Work Title:

Journal of Research of the U.S. Geological Survey

Citation LatN:

30.0

Citation LatS:

25.84

Citation LonE:

-93.52

Citation LonW:

-97.72

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Citation Phsyical Description:

11 p.

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Citation Publisher:

U.S. Geological Survey

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Citation Search Results Text:

Textural distribution of sea-floor sediments, south Texas Outer Continental Shelf; 1976; Article; Journal; Journal of Research of the U.S. Geological Survey; Shideler, Gerald L.

Citation Start Page:

703

Citation Volume:

Citation Year:

1976

Type:

citation/reference

Text:

Textural distribution of sea-floor sediments, south Texas Outer Continental Shelf; 1976; Article; Journal; Journal of Research of the U.S. Geological Survey; Shideler, Gerald L.