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Detailed grain size and heavy mineralogy of sands of northern Texas Gulf Coast; implications with regard to coastal barrier development

Mary Lou Cole and John B. Anderson
Detailed grain size and heavy mineralogy of sands of northern Texas Gulf Coast; implications with regard to coastal barrier development (in Gulf Coast Association of Geological Societies and Gulf Coast Section SEPM, Anonymous)
AAPG Bulletin (September 1982) 66 (9): 1427

Abstract

The large volume of literature available on Gulf Coast sedimentology, along with recent advances in computerized analytical methods, now enables more detailed work to be accomplished. Numerous grain-size (automated settling tube) and heavy mineralogical analyses have been conducted on sand samples from the northeastern Texas Gulf Coast. Analyses of local point-bar samples result in the delineation of major river sand sources in the region. Kyanite/garnet/hornblende+pyroxene ratios seem to be the most useful criteria for distinguishing these sources. Grain-size data show combinations of discrete modes characteristic of each river system, whereas the subaerial delta lobes of these rivers consist of finer, better sorted sands, which are believed to represent the coarsest particles transported in suspension. Beach sands are slightly finer and much better sorted than wave-dominated delta sands. The oldest sands of Galveston Island were derived from the Trinity River, implying a possible deltaic origin for the island. However, most of the island is comprised of Mississippi River, Brazos River, and Trinity-Sabine River sands, mixed in approximately equal proportions, suggesting an offshore Pleistocene source for these features. These sands were deposited on an irregular Pleistocene erosional surface, resulting in dramatic thickness variations. Modern offshore sands and those currently being accreted to barriers, contain a high proportion of Mississippi River sand. This change results from the depletion of offshore mixed sands and marks the onset of barrier retreat.


ISSN: 0149-1423
EISSN: 1558-9153
Coden: AABUD2
Serial Title: AAPG Bulletin
Serial Volume: 66
Serial Issue: 9
Title: Detailed grain size and heavy mineralogy of sands of northern Texas Gulf Coast; implications with regard to coastal barrier development
Title: Gulf Coast Association of Geological Societies and Gulf Coast Section SEPM
Author(s): Cole, Mary LouAnderson, John B.
Author(s): Anonymous
Affiliation: Rice Univ., Houston, TX, United States
Pages: 1427
Published: 198209
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
Meeting name: Gulf Coast Association of Geological Societies and Gulf Coast Section SEPM
Meeting location: Houston, TX, USA, United States
Meeting date: 19821027Oct. 27-29, 1982
Summary: Y
Accession Number: 1983-027682
Categories: Geomorphology
Document Type: Serial Conference document
Bibliographic Level: Analytic
N29°00'00" - N29°30'00", W95°19'60" - W94°40'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute.
Update Code: 1983
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