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Crustal structure of the western margin of the Rio Grande Rift and Mogollon-Datil volcanic field, southwestern New Mexico and southeastern Arizona

Robert V. Schneider and G. Randy Keller
Crustal structure of the western margin of the Rio Grande Rift and Mogollon-Datil volcanic field, southwestern New Mexico and southeastern Arizona (in Basins of the Rio Grande Rift; structure, stratigraphy, and tectonic setting, G. Randy Keller (editor) and Steven M. Cather (editor))
Special Paper - Geological Society of America (1994) 291: 207-226

Abstract

The southeastern margin of the Colorado Plateau (CP) lies in southwestern New Mexico and southeastern Arizona. It is defined as the boundary between the CP, the Rio Grande rift, and the Basin and Range (BRP) provinces. Along its western and southern margins, the CP is physically distinguishable from the BRP by major escarpments. Because of a thick cover of volcanic material associated with the Mogollon-Datil volcanic field (MDVF), no such demarcation exists in the study area. To accurately determine lithospheric structure in this area, two seismic refraction lines that intersect within the MDVF were studied. In addition, gravity data along these lines were simultaneously analyzed. Based on these data, velocity and density profiles were created via an iterative forward modeling processes. Major crustal boundaries for each paired gravity/refraction profile were constrained to agree at the point of intersection and with other geological and geophysical control. Structurally, the CP margin appears as an abrupt northward deepening of the Moho just south of Datil, New Mexico. This lies beneath a major low density-low velocity upper crustal body, interpreted to be a plutonic complex approximately 230 by 150 by 6 km. It is very likely that this complex provided the source material for the MDVF. Stoping appears to be the vehicle for emplacement of this body, implying a major crustal reorganization in middle Tertiary time.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 291
Title: Crustal structure of the western margin of the Rio Grande Rift and Mogollon-Datil volcanic field, southwestern New Mexico and southeastern Arizona
Title: Basins of the Rio Grande Rift; structure, stratigraphy, and tectonic setting
Author(s): Schneider, Robert V.Keller, G. Randy
Author(s): Keller, G. Randyeditor
Author(s): Cather, Steven M.editor
Affiliation: University of Texas at El Paso, Department of Geological Sciences, El Paso, TX, United States
Affiliation: University of Texas at El Paso, Department of Geological Sciences, El Paso, TX, United States
Pages: 207-226
Published: 1994
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 0-8137-2291-8
References: 77
Accession Number: 1995-007231
Categories: Solid-earth geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., geol. sketch maps
N31°30'00" - N37°00'00", W107°30'00" - W105°30'00"
N32°10'00" - N34°30'00", W109°02'60" - W106°30'00"
N33°40'00" - N40°30'00", W114°00'00" - W106°19'60"
N29°00'00" - N43°30'00", W122°00'00" - W102°30'00"
N31°15'00" - N37°00'00", W115°00'00" - W109°00'00"
Secondary Affiliation: New Mexico Bureau of Mines and Mineral Resources, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 199503
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