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Nonlinear inversion of isostatic residual gravity data from Montage Basin, northern Gulf of California

Juan Garcia-Abdeslem
Nonlinear inversion of isostatic residual gravity data from Montage Basin, northern Gulf of California
Geophysics (May 2017) 82 (3): G45-G55

Abstract

The flexural isostatic response to surface loads is used to estimate the crustal thickness in northwestern Mexico and Southwestern USA. This estimate is used to compute an isostatic regional gravity, which, subtracted from Bouguer gravity anomalies, led to the isostatic residual gravity anomaly at Montage Basin. This basin is located between the southern portion of the Mexicali Valley and the northern Gulf of California, it roughly has an extension of 100 km long X 40 km wide, and it shows a gravity minimum reaching approximately -65 mGal. Montage Basin is within the extensional province of the Gulf of California, where rifting is currently an ongoing geologic process, and deep exploratory wells drilled by Petroleos Mexicanos have shown that the basin accommodates thick sedimentary sequences greater than 5 km. The interpretation of the isostatic residual gravity anomaly is considered as a nonlinear inverse problem, constrained using density as a function of depth derived from Gardner's equation applied to dual time Delta t-logs, assuming isostatic equilibrium and considering the basin as a subsurface load that is compensated at depth by a mass of unknown shape and density. The outcome of the inverse problem suggests that Montage Basin accommodates as much as 7.5 km thick sedimentary sequences and a compensating mass at a minimum depth of 13 km.


ISSN: 0016-8033
EISSN: 1942-2156
Coden: GPYSA7
Serial Title: Geophysics
Serial Volume: 82
Serial Issue: 3
Title: Nonlinear inversion of isostatic residual gravity data from Montage Basin, northern Gulf of California
Affiliation: Centro de Investigacion Cientifica y Educacion Superior de Ensenada, Departamento de Geofisica Aplicada, Ensenada, Mexico
Pages: G45-G55
Published: 201705
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 61
Accession Number: 2017-042093
Categories: Applied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Includes appendices
Illustration Description: illus. incl. 1 table
N22°45'00" - N32°00'00", W115°00'00" - W106°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 201723
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