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Halokinetic-sequence stratigraphy, fluvial sedimentology and structural geometry of the Eocene Carroza Formation along La Popa salt weld, La Popa Basin, Mexico

By
Joseph R. Andrie
Joseph R. Andrie
Department of Geological Sciences, New Mexico State University, P.O. Box 30001, Las Cruces, NM 88003, USA
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Katherine A. Giles
Katherine A. Giles
Department of Geological Sciences, New Mexico State University, P.O. Box 30001, Las Cruces, NM 88003, USA
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Timothy F. Lawton
Timothy F. Lawton
Department of Geological Sciences, New Mexico State University, P.O. Box 30001, Las Cruces, NM 88003, USA
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Mark G. Rowan
Mark G. Rowan
Rowan Consulting, Inc., 850 8th St, Boulder, CO 80302, USA
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Published:
January 01, 2012

Abstract

The Eocene Carroza Formation in La Popa Basin, Mexico, represents fluvial sedimentation in a shortening-influenced salt-withdrawal minibasin, termed the Carroza Syncline. The Carroza Syncline lies adjacent to the La Popa salt weld, which was formerly a passively-rising salt wall that was shortened during the Hidalgoan Orogeny in Late Cretaceous and Palaeogene time. The Carroza Formation displays distinct upsection changes in fluvial facies distribution and geometry of halokinetic drape folding. Fluvial channel distribution changes upwards from widespread thin, broad channels with variable palaeocurrents in the lower part of the formation to thick, stacked channels concentrated in the hinge of the Carroza Syncline with weld-parallel palaeocurrent directions in the upper part. The upper and middle members of the Carroza contain debris-flow facies derived from diapir roof strata and the diapir itself. The style of halokinetic drape fold upturn and thinning towards the weld changes upsection from a broad (800–1500 m) to a narrow (50–200 m) zone, where upper Carroza strata are overturned and in direct contact with remnant gypsum along the weld. The upsection changes in fluvial facies distribution and geometry reflect an overall decrease in local sediment-accumulation rates relative to salt-rise rates controlled by both Hidalgoan shortening and passive diapirism.

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Contents

Geological Society, London, Special Publications

Salt Tectonics, Sediments and Prospectivity

G. I. Alsop
G. I. Alsop
University of Aberdeen, UK
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S. G. Archer
S. G. Archer
University of Aberdeen, UK
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A. J. Hartley
A. J. Hartley
University of Aberdeen, UK
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N. T. Grant
N. T. Grant
ConocoPhillips UK Ltd, Aberdeen, UK
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R. Hodgkinson
R. Hodgkinson
Bowleven plc, Edinburgh, UK
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Geological Society of London
Volume
363
ISBN electronic:
9781862396111
Publication date:
January 01, 2012

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