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Open File Report 142

Geochemical exploration in regolith-dominated terrain of North Queensland - Mt Isa Field Trip 26-28 July, 1995

R.R. Anand, J. Wilford, T.J. Munday, C. Phang, J.E. Wildman and K.M. Scott

The purpose of this excursion is to introduce some aspects of the weathering and geomorphology of the Mt. Isa region that are important to geochemical exploration in the region. Investigation of the regolith-landscape features of the Mt. Isa region commenced in April 1994 by CSIRO, AGSO and University of Queensland as a part of the CSIRO/AMIRA Project 417 (Geochemical exploration in regolith-dominated terrain of North Queensland). Initially, a regional regolith-landform framework was established to characterise some of the regolith materials. A preliminary regional regolith-landform map (1:500,000) was produced to show the broad regolith-landform characteristics. Substantial district-scale investigations are continuing in the Western Succession (Buckley-River-Grey Ghost-Drifter) and Eastern Succession (Little Eva, Tringadee) (Figure 1). The work includes regolith mapping (1:25,000-1:50,000), regolith characterisation, regolith dating, orientation sampling of different sample media and correlations of these characteristics within the framework of a regional regolith-landform evolution model.


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