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Book Chapter

Bouguer Gravity Anomalies and Crustal Structure in Northwestern Mexico

By
Robert Wayne Schellhorn
Robert Wayne Schellhorn
Oryx Energy Co. Dallas, Texas, U.S.A.
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Carlos L. V. Aiken
Carlos L. V. Aiken
University of Texas at Dallas Richardson, Texas, U.S.A.
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Mauricio F. de la Fuente
Mauricio F. de la Fuente
Instituto de Geologia Universidad Nacional Autonoma de Mexico Mexico, DF, Maxico
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Published:
January 01, 1991

Abstract

A new Bouguer gravity anomaly map has been produced for northern Mexico using approximately 15,000 new gravity stations observed over the last 10 years. An analysis of the trend surfaces of elevations and Bouguer gravity anomalies were used to predict regional Bouguer gravity anomalies from topography resulting in residual/isostatic maps. From these maps, no recognizable offset is observed in the location of a proposed Mojave-Sonora megashear, although a crustal boundary is indicated by a change in trend or truncation of various features in northwestern Sonora. Also these maps show possible trends of trench-related features in the Baja region which continue the length of Baja and apparently are not offset by major transverse structures. Three crustal models were generated using previous seismic control. These models indicate that the crust in the Gulf of California region is approximately 10 km thick, whereas the crust in the Sierra Madre Occidental is more than 50 km thick. The lithosphere is approximately 10 km thick over the Baja rift and more than 95 km thick in the area of the Sierra Madre Occidental.

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Contents

AAPG Memoir

The Gulf and Peninsular Province of the Californias

J. Paul Dauphin
J. Paul Dauphin
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Bernd R. T. Simoneit
Bernd R. T. Simoneit
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American Association of Petroleum Geologists
Volume
47
ISBN electronic:
9781629811130
Publication date:
January 01, 1991

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