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Assessing vertical axis rotations in large-magnitude extensional settings: A transect across the Death Valley extended terrane, California

Petronis, Michael S. and Geissman, John W. and Holm, Daniel K. and Wernicke, Brian and Schauble, Edwin (2002) Assessing vertical axis rotations in large-magnitude extensional settings: A transect across the Death Valley extended terrane, California. Journal of Geophysical Research B, 107 (B1). Art. No. 2010. ISSN 0148-0227. doi:10.1029/2001JB000239. https://resolver.caltech.edu/CaltechAUTHORS:20140721-143226413

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Abstract

Models for Neogene crustal deformation in the central Death Valley extended terrane, southeastern California, differ markedly in their estimates of upper crustal extension versus shear translations. Documentation of vertical axis rotations of range-scale crustal blocks (or parts thereof) is critical when attempting to reconstruct this highly extended region. To better define the magnitude, aerial extent, and timing of vertical axis rotation that could mark shear translation of the crust in this area, paleomagnetic data were obtained from Tertiary igneous and remagnetized Paleozoic carbonate rocks along a roughly east-west traverse parallel to about 36°N latitude. Sites were established in ∼7 to 5 Ma volcanic sequences (Greenwater Canyon and Brown's Peak) and the ∼10 Ma Chocolate Sundae Mountain granite in the Greenwater Range, ∼8.5 to 7.5 Ma and 5 to 4 Ma basalts on the east flank of the Black Mountains, the 10.6 Ma Little Chief stock and upper Miocene(?) basalts in the eastern Panamint Mountains, and Paleozoic Pogonip Group carbonate strata in the north central Panamint Mountains. At the site level, most materials yield readily interpretable paleomagnetic data. Group mean directions, after appropriate structural corrections, suggest no major vertical axis rotation of the Greenwater Range (e.g., D = 359°, I = 46°, α_(95) = 8.0°, N = 12 (7 normal (N), 5 reversed (R) polarity sites)), little post-5 Ma rotation of the eastern Black Mountains (e.g., D = 006°, I = 61°, α_(95) = 4.0°, N = 9 N, 6 R sites), and no significant post-10 Ma rotation of the Panamint Range (e.g., D = 181°, I = −51°, α_(95) = 6.5°, N = 9 R sites). In situ data from the Greenwater Canyon volcanic rocks, Chocolate Sundae Mountain granite, Funeral Peak basalt rocks, the Little Chief stock, and Paleozoic carbonate rocks (remagnetized) are consistent with moderate south east-side-down tilting of the separate range blocks during northwest directed extension. The paleomagnetic data reported here suggest that the Panamints shared none of the 7 Ma to recent clockwise rotation of the Black Mountains crystalline core, as proposed in recent models for transtensional development of the central Death Valley extended terrane.


Item Type:Article
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http://dx.doi.org/10.1029/2001JB000239DOIArticle
http://onlinelibrary.wiley.com/doi/10.1029/2001JB000239/abstractPublisherArticle
ORCID:
AuthorORCID
Wernicke, Brian0000-0002-7659-8358
Additional Information:© 2002 The American Geophysical Union. Received 11 September 2000; Revised 7 May 2001; Accepted 14 July 2001; Published 18 January 2002. We thank Ren Thompson for use of his unpublished map of the central Death Valley extended terrane, John Miller and Dave Schneider for assistance sampling in sometimes inhospitable conditions, Zeke Snow for useful comments on a very early version of the manuscript, and the National Park Service for (limited) permission to work in Death Valley, California. Funded in part by a NSF grant (Wernicke and Geissman) and an American Chemical Society Grant (Holm). We greatly appreciate the efforts of the reviewers, Mark Hudson and Jon Hagstrum, which greatly clarified and improved an earlier version of the manuscript.
Funders:
Funding AgencyGrant Number
NSFUNSPECIFIED
American Chemical SocietyUNSPECIFIED
Subject Keywords:paleomagnetism, Death Valley, continental extension, vertical axis rotation, crustal deformation, plane strain
Issue or Number:B1
DOI:10.1029/2001JB000239
Record Number:CaltechAUTHORS:20140721-143226413
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140721-143226413
Official Citation:Petronis, M. S., Geissman, J. W., Holm, D. K., Wernicke, B., & Schauble, E. (2002). Assessing vertical axis rotations in large-magnitude extensional settings: A transect across the Death Valley extended terrane, California. Journal of Geophysical Research: Solid Earth, 107(B1), EPM 4-1-EPM 4-21. doi: 10.1029/2001jb000239
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47372
Collection:CaltechAUTHORS
Deposited By: Joanne McCole
Deposited On:22 Jul 2014 15:46
Last Modified:10 Nov 2021 17:39

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