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Variation in paleomagnetic rotations and kinematics of the north-central Rio Grande Rift, New Mexico

Stephen L. Salyards, James F. Ni and M. James Aldrich
Variation in paleomagnetic rotations and kinematics of the north-central Rio Grande Rift, New Mexico (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: 59-71

Abstract

Previous paleomagnetic work in the north-central Rio Grande rift (RGR) of northern New Mexico has demonstrated the presence of counterclockwise paleomagnetic rotations, possibly due to left-lateral shearing across the rift. To improve the spatial coverage and resolution of the intrarift rotation, we analyzed the late Tertiary sediments within the exposed Espanola Basin for paleomagnetic rotations. From five sites broadly distributed across the rift, the amount of rotation varies from little on the eastern edge to over 20 degrees counterclockwise in the central and western rift. If interpreted as tectonic net rotation axes, the amount of rotation varies from 10 to 24 degrees . Gently northeast plunging net rotation axis orientations in the eastern part of the rift indicate dominantly extension-related deformation. Steeper axis inclinations near the center and western part of the rift and Embudo accommodation zone indicate the presence of increased horizontal shearing in these regions. The paleomagnetic data show that the north-central Rio Grande rift is not rotating as a unit but rather consists of a number of smaller independently, counterclockwise-rotating blocks.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 291
Title: Variation in paleomagnetic rotations and kinematics of the north-central Rio Grande Rift, New Mexico
Title: Basins of the Rio Grande Rift; structure, stratigraphy, and tectonic setting
Author(s): Salyards, Stephen L.Ni, James F.Aldrich, M. James, Jr.
Author(s): Keller, G. Randyeditor
Author(s): Cather, Steven M.editor
Affiliation: New Mexico State University, Geophysics Program, Las Cruces, NM, United States
Affiliation: University of Texas at El Paso, Department of Geological Sciences, El Paso, TX, United States
Pages: 59-71
Published: 1994
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 0-8137-2291-8
References: 36
Accession Number: 1995-007222
Categories: Solid-earth geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, geol. sketch maps
N35°00'00" - N36°15'00", W106°30'00" - W105°30'00"
Secondary Affiliation: New Mexico Bureau of Mines and Mineral Resources, USA, United StatesLos Alamos National Laboratory, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 199503
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