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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 54 (1970)

Issue: 7. (July)

First Page: 1271

Last Page: 1289

Title: Previous HitSaltNext Hit Piercement in Shallow Gulf Coast Previous HitSaltNext Hit Structures

Author(s): Derrell A. Smith (2), F. A. E. Reeve (2)

Abstract:

Data from 16 Previous HitsaltNext Hit structures of the Gulf Coast province have been analyzed to (1) document some of the piercement features on shallow Gulf Coast Previous HitsaltNext Hit structures and (2) investigate some of the mechanisms and controls of the Previous HitsaltNext Hit-piercement processes. The process of piercement by vertical displacement of overburden by Previous HitsaltNext Hit has been the primary subject of this study. Accordingly, the investigations have concerned mainly the upper section of alternating sandstone and shale beds that are in contact with the Previous HitsaltNext Hit and show a discordant relation with the Previous HitsaltNext Hit core.

The two general types of piercement processes recognized on shallow Gulf Coast Previous HitsaltNext Hit domes are (1) piercement by rupture of the overburden through fracturing, faulting, and tilting of the overburden upward and outward in segments, with rise of the Previous HitsaltNext Hit being enhanced by erosion, and (2) piercement by vertical displacement of overburden ahead of the growing Previous HitsaltNext Hit mass, accompanied by peripheral faulting surrounding the Previous HitsaltNext Hit Previous HitdomeNext Hit. The discordant relation commonly observed in the upper parts of shallow Previous HitsaltNext Hit structures between the Previous HitsaltNext Hit plug and the enveloping strata is the result of piercement by vertical displacement of overburden by Previous HitsaltNext Hit. The discordant relation can be produced by piercement of each bed contemporaneously with deposition or by postdepositional piercement of a thick section of overburden. Postdepositional piercement and vertical displacement of overburden as much as 2,400 ft thick can be documented in the Gulf Coast. Piercement by vertical displacement is most likely where the Previous HitsaltNext Hit has a plug shape and is growing by a process of plug flow. The plug shape evolves from a broad Previous HitsaltNext Hit mound or pillow in the later stages of Previous HitsaltNext Hit Previous HitdomeNext Hit growth. Piercement by rupture and outward tilting of segments of overburden is most likely in the earlier stages of Previous HitsaltNext Hit-Previous HitdomeNext Hit growth, when the Previous HitsaltTop mass is in the broad mound or pillow shape or is changing from the pillow to the plug shape.

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