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The AAPG/Datapages Combined Publications Database

AAPG Special Volumes

Abstract


Pub. Id: A117 (1978)

First Page: 313

Last Page: 326

Book Title: SG 7: Framework, Facies, and Oil-Trapping Characteristics of the Upper Continental Margin

Article/Chapter: Holocene Sediment Geochemistry of Continental Slope and Intraslope Basin Areas, Northwest Gulf of Mexico: 5. Intraslope Basins

Subject Group: Geologic History and Areal Geology

Spec. Pub. Type: Studies in Geology

Pub. Year: 1978

Author(s): T. R. McKee (2), L. M. Jeffrey (3), B. J. Presley (3), U. G. Whitehouse II (4)

Abstract:

Slope topography has a major effect on the geochemical properties of near-surface sediment on the Texas-Louisiana Slope. Sediment in intraslope basins accumulates faster than in areas outside the basins, leading to a more anoxic character for basin sediment. One basin was found to be partly filled with a high-density brine, resulting in completely anoxic water and sediment, undisturbed by benthic organisms. Iron and manganese are mobilized in the sediment column, and recrystallize in patterns depending on sediment accumulation rates and redox conditions.

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