Journal article

Late Neoproterozoic to Holocene thermal history of the Precambrian Georgetown Inlier, northeast Australia

RA Spikings, DA Foster, BP Kohn, PB O'Sullivan

AUSTRALIAN JOURNAL OF EARTH SCIENCES | BLACKWELL SCIENCE ASIA | Published : 2001

Abstract

Carboniferous-Permian volcanic complexes and isolated patches of Upper Jurassic - Lower Cretaceous sedimentary units provide a means to qualitatively assess the exhumation history of the Georgetown Inlier since ca 350 Ma. However, it is difficult to quantify its exhumation and tectonic history for earlier times. Thermochronological methods provide a means for assessing this problem. Biotite and alkall feldspar 40Ar/39Ar and apatite fission track data from the inlier record a protracted and non-linear cooling history since ca 750 Ma. 40Ar/39Ar ages vary from 380 to 735 Ma, apatite fission track ages vary between 132 and 258 Ma and mean track lengths vary between 10.89 and 13.11 μm. These resu..

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