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AAPG Bulletin

Abstract


Volume: 50 (1966)

Issue: 3. (March)

First Page: 479

Last Page: 504

Title: New Seismic Data Concerning Sediments and Diapiric Structures in Sigsbee Deep and Upper Continental Slope, Gulf of Mexico

Author(s): Maurice Ewing (2), John Antoine (3)

Abstract:

Emerged knolls and buried domes in the Sigsbee Deep and on the upper continental slope of the Gulf of Mexico were recorded on an Electro-Sonic Profiler (ESP) and Precision Depth Recorder (PDR) survey from Galveston to the Campeche Bank and back. Numerous diapiric structures were observed north of the Sigsbee Scarp, suggesting possible continuity of a belt of such structures extending from the Texas-Louisiana coast to the scarp. The scarp appears to be the front of the system of diapirs. The diapirs parallel with the scarp seem to be ridges that may have played a role in the building of the continental borderland by retaining sediment moving from the continent toward the basin. The Campeche continental shelf in the area surveyed appears to be typical of a depositional terr ce resulting from upbuilding and outbuilding; there is little or no evidence of reef growth.

The previous finding that some of the shallower Sigsbee domes are indicated by topographic highs of a few fathoms of relief was substantiated; these highs were shown to be underlain by some PDR sub-bottom reflectors having an even greater relief than the topographic highs.

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