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- W1986200549 abstract "ABSTRACT It has been shown previously that different source rocks produce quartz sand grains with unique gross shape characteristics. These gross shape characteristics cannot be altered by abrasion, and are thus an immutable record of sediment source. Therefore, sand grains in a sedimentary basin should contain in the gross shape a fingerprint of their source unaffected by the amount of reworking to which the sands have been subjected. In order to test this idea, the shapes of late Pleistocene-Holocene sands grains from two sources in the northwest Gulf of Mexico (the Rio Grande and Western Gulf Province) were analyzed with the Fourier grain shape technique. The results indicate that two gross grain shape assemblages are present in the sands of these two provinces. One assemblage is associated with a mineralogical suite typical of relatively mature coastal plain sediments, and thus probably represents the contribution of sediment from such a Coastal Plain Source Terrane. The other assemblage is associated with a relatively immature mineralogical suite more typical of sediments derived from crystalline sources, and thus probably represents the contribution from such a Source Terrane. Both assemblages are found in sands of both provinces, inasmuch as the major rivers in these provinces which act as conduits for these sediments drain both source terrane types. However, the amount of area of these terranes drained by the rivers differs between the provinces, and so the relative proportions of these assemblages in the sands of the two provinces also differ. Rio Grande Province sands contain on the average 59% of the assemblage associated with the Highland Source Terrance, while Western Gulf Province sands contain only 34% of this assemblage. Thus, it is the difference in the relative proportion of these two assemblages in the samples which can be used to identify and distinguish the sands from the two provinces. All in all, the results of this pilot project indicate that the analysis of gross grain shape can indeed differentiate sediments from different sources in the Gulf of Mexico." @default.
- W1986200549 created "2016-06-24" @default.
- W1986200549 creator A5001291717 @default.
- W1986200549 date "1983-01-01" @default.
- W1986200549 modified "2023-09-25" @default.
- W1986200549 title "Differentiating Sediments from Different Sources in Gulf Basin by Grain-Shape Analysis: Example from Late Pleistocene-Holocene Sediments of Northwestern Gulf of Mexico Continental Shelf: ABSTRACT" @default.
- W1986200549 doi "https://doi.org/10.1306/ad4607f6-16f7-11d7-8645000102c1865d" @default.
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