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A field-based estimate of the zircon fission-track closure temperature

Abstract : field-based estimate of the zircon fission-track closure temperature is proposed from 13 zircon fission-track cooling ages of the Gold Butte block, SE Nevada. Using previously published and new thermochronological data, the thermal history of the Gold Butte block is re-evaluated, resulting in a geothermal-gradient estimate of 20.3 °C/km and a slow cooling rate of 0.55 ± 0.02 °C/m.y. from the Late Jurassic to the early Miocene before onset of rapid Miocene cooling. The rapidly cooled part of the Gold Butte block provides a slip rate of 10.5 km/m.y. of the hanging wall that caused the Miocene exhumation of this crustal section. Assuming these thermal conditions are correct, the closure temperature of the zircon fission-track system is determined at 205 ± 18 °C, which is in good agreement with previous field-based estimates. Because of the variation in zircon fission-track annealing behavior with radiation damage, field studies are a suitable way to calibrate the closure temperature of the zircon fission-track system.
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https://hal-insu.archives-ouvertes.fr/insu-00410905
Contributor : Pascale Talour <>
Submitted on : Tuesday, August 25, 2009 - 10:58:27 AM
Last modification on : Friday, September 25, 2020 - 3:13:58 AM

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Matthias Bernet. A field-based estimate of the zircon fission-track closure temperature. Chemical Geology, Elsevier, 2009, 259, pp.181-189. ⟨10.1016/j.chemgeo.2008.10.043⟩. ⟨insu-00410905⟩

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