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Calibration of the apatite (U-Th)/He thermochronometer on an exhumed fault block, White Mountains, California

Stockli, Daniel F. and Farley, Kenneth A. and Dumitru, Trevor A. (2000) Calibration of the apatite (U-Th)/He thermochronometer on an exhumed fault block, White Mountains, California. Geology, 28 (11). pp. 983-986. ISSN 0091-7613. doi:10.1130/0091-7613(2000)28<983:COTAHT>2.0.CO;2.

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This study provides an empirical calibration of the apatite (U-Th)/He thermochronometer using the thermal structure derived from an extensive apatite fission-track study of an exhumed, normal-fault–bounded crustal block in the White Mountains in the western Basin and Range province. This fault block has been tilted ∼25° to the east during extension, exposing a continuous section of rocks previously buried to ∼7 km. Apatites yield (U-Th)/He apparent ages of ca. 50–55 Ma at shallow pre-extensional crustal levels that decrease systematically to ca. 12 Ma at >4.5 km paleodepth. The ages exhibit a well-defined exhumed apatite He partial retention zone over a pre-extensional temperature range of ∼40–80 °C and are completely reset above 80 °C, as calibrated from the apatite fission-track data. This pattern is in good agreement with He diffusion behavior predicted by laboratory experiments. The (U-Th)/He and fission-track methods yield concordant estimates for the timing of the onset of extensional faulting in the White Mountains ca. 12 Ma. Given the partially overlapping temperature-sensitivity windows, the (U-Th)/He and fission-track thermochronometers are highly complementary and may be used together to reconstruct thermal histories over the temperature window of ∼40–110 °C.

Item Type:Article
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Farley, Kenneth A.0000-0002-7846-7546
Additional Information:© 2000 Geological Society of America. Manuscript received March 23, 2000. Revised manuscript received July 24, 2000. Manuscript accepted July 31, 2000. This project was supported by National Science Foundation grants EAR-9417937, EAR-9725371 (to E. Miller), and EAR-9805226 (to Farley); a Stanford University McGee grant and a University of California White Mountains Research Station fellowship to Stockli; and a Packard Foundation fellowship to Farley. We thank L. Gilley, L. Hedges, J. Hourigan, and B. Surpless for assistance in the field and laboratory, B. Jones for assistance with electron microprobe work, and the Oregon State University reactor facility for sample irradiation.
Group:UNSPECIFIED, Division of Geological and Planetary Sciences
Funding AgencyGrant Number
Stanford University McGee grantUNSPECIFIED
University of California White Mountains Research Station FellowshipUNSPECIFIED
Packard Foundation FellowshipUNSPECIFIED
Subject Keywords:(U-Th)/He dating, fission-track dating, thermochronology, extensional faulting, White Mountains.
Issue or Number:11
Record Number:CaltechAUTHORS:20130204-092017926
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Official Citation: Daniel F. Stockli, Kenneth A. Farley, and Trevor A. Dumitru Calibration of the apatite (U-Th)/He thermochronometer on an exhumed fault block, White Mountains, California Geology, November, 2000, v. 28, p. 983-986, doi:10.1130/0091-7613(2000)28<983:COTAHT>2.0.CO;2
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36750
Deposited By: Ruth Sustaita
Deposited On:04 Feb 2013 18:47
Last Modified:09 Nov 2021 23:24

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