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Thermochronological constraints on the timing and magnitude of Miocene and Pliocene extension in the central Wassuk Range, western Nevada

Stockli, Daniel F. and Surpless, Benjamin E. and Dumitru, Trevor A. and Farley, Kenneth A. (2002) Thermochronological constraints on the timing and magnitude of Miocene and Pliocene extension in the central Wassuk Range, western Nevada. Tectonics, 21 (4). Art. No. 1028. ISSN 0278-7407. https://resolver.caltech.edu/CaltechAUTHORS:20130415-142346938

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Abstract

Apatite fission track and (U-Th)/He thermochronological data provide new constraints on the timing of faulting and exhumation of the Wassuk Range, western Nevada, where east dipping normal faults have accommodated large-magnitude ENE-WSW oriented extension. Extensional deformation has resulted in the exhumation of structurally coherent fault blocks that expose sections of preextensional mostly granitic upper crust in the Grey Hills and central Wassuk Range. These fault blocks display westward tilts of ∼60° and expose preextensional paleodepths of up to ∼8.5 km, based on the structural reconstruction of tilted preextensional Tertiary andesite flows that unconformably overlie Mesozoic basement rocks. Apatite fission track and (U-Th)/He thermochronological data from the fault blocks constrain the onset of rapid footwall exhumation at ∼15 Ma. Fission track modeling results indicate rapid fault block exhumation occurred between ∼15 and 12 Ma, which is in agreement with Miocene volcanic rocks that bracket the tilting history. In addition, fission track and (U-Th)/He data suggest reduced rates of cooling following major extension, as well as renewed cooling related to active, high-angle faulting along the present-day range front starting at ∼4 Ma. Thermochronological data from structurally restored fault blocks indicate a preextensional Miocene geothermal gradient of 27° ± 5°C/km. The thermochronological constraints on the timing of extensional faulting and the eruptive history in the Wassuk Range imply a model for extension where crustal heating and volcanism precede the onset of rapid large magnitude extension, and where synextensional magmatism is suppressed during the highest rates of extension.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/2001TC001295DOIUNSPECIFIED
http://onlinelibrary.wiley.com/doi/10.1029/2001TC001295/abstractPublisherUNSPECIFIED
ORCID:
AuthorORCID
Farley, Kenneth A.0000-0002-7846-7546
Additional Information:© 2002 by the American Geophysical Union. Received 23 April 2001; revised 5 February 2002; accepted 27 February 2002; published 8 August 2002. This project was supported by NSF grants EAR-9417939 and EAR-9725371 (to E. L. Miller and T. A. Dumitru), Caltech postdoctoral fellowship to D. Stockli, and a Packard fellowship to K. Farley. We would like to thank E. Miller, M. McWilliams, J. Dilles, J. Oldow, and S. Klemperer for stimulating discussions and helpful insights, and B. Wernicke and P. Armstrong for improving the final version of the manuscript.
Funders:
Funding AgencyGrant Number
NSFEAR-9417939
NSFEAR-9725371
Caltech Postdoctoral FellowshipUNSPECIFIED
Packard FellowshipUNSPECIFIED
Subject Keywords:Basin and Range; Walker Lane Belt; Wassuk Range; extension; thermochronology
Issue or Number:4
Record Number:CaltechAUTHORS:20130415-142346938
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130415-142346938
Official Citation:Stockli, D. F., B. E. Surpless, T. A. Dumitru, and K. A. Farley, Thermochronological constraints on the timing and magnitude of Miocene and Pliocene extension in the central Wassuk Range, western Nevada, Tectonics, 21(4), doi:10.1029/2001TC001295, 2002
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37948
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:15 Apr 2013 23:11
Last Modified:03 Mar 2020 13:01

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