Journal article

Use of Ar-40/Ar-39 K-feldspar thermochronology in basin thermal history reconstruction: an example from the Big Lake Suite granites, Warburton Basin, South Australia

Sandra McLaren, W James Dunlap

BASIN RESEARCH | WILEY | Published : 2006

Abstract

The potential use of 40Ar/39Ar thermochronologic data from K-feldspars in reconstructing basin thermal history has been evaluated using the example of the Warburton/Cooper/Eromanga Basin, Australia's largest onshore oil- and gas-producing basin. Results from 40Ar/39Ar step-heating experiments reveal details of the evolution of the basin system, including the following: (1) the operation of high geothermal gradient regimes during the earliest basin evolution, suggesting that basin formation was active rather than passive; (2) slow cooling from a Permo-Triassic temperature peak of at least 250-300°C; (3) a rise in thermal gradients to contemporary bottom hole temperatures in the last 5-10 Myr;..

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