northwest Biogeochemical expression of buried gold mineralization
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australian electronic gold prospecting forum.com  |  Geology and occurrence of gold deposits  |  Gold deposits  |  Gold in the N Territory  |  Topic: Biogeochemical expression of buried gold mineralization 0 Members and 1 Guest are viewing this topic. « previous next »
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Doug
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« on: Wednesday January 30 2019 21:26:59 AEDT PM »

Biogeochemical expression of buried gold mineralization in semi-arid northern Australia: penetration of transported cover at the Titania Gold Prospect, Tanami Desert, Australia
N. Reid1,2, S. M. Hill1 & D. M. Lewis2
1Co-operative Research Centre for Landscape Environments and Mineral Exploration, Geology & Geophysics, University
of Adelaide, Adelaide, SA 5005, Australia
  
2Department of Chemical Engineering, University of Adelaide, Engineering North Building, Adelaide, SA 5005,
Australia
ABSTRACT: Gold mineralization at the Titania Prospect in the Tanami Desert
Region is buried by transported regolith including mixed aeolian and sheetflow
deposits over palaeodrainage sediments. This prospect is the only example of
discovery through significant thickness of transported regolith and therefore
provides an important site for developing an understanding of geochemical
pathways from buried mineralization. Plant sampling for biogeochemical analysis
was conducted over this prospect in October 2005 with the aims of characterizing
the expression of the mineralization and in particular what species best expressed the
chemical signature of the buried mineralization. The multi-element chemical
compositions of leaves or phyllodes were compared across the mineralized and
adjacent ‘background’ areas as well as between adjacent plants at the same sites to
directly compare the uptake properties of different plant species. The nine most
widespread and abundant plant species at the prospect were sampled, of which three
are of particular interest. The soft spinifex (Triodia pungens) expressed all of the key
ore indicator elements (Au, As, Zn, S) and best delineated the buried mineralization.
Melaleuca lasiandra and Acacia bivenosa also delineated the mineralization but their
usefulness is reduced because of their more restricted distributions. Baseline
elemental levels varied among species, and it is suggested that these differences
largely relate to differences in rooting depth and thereby the plant’s ability to access
different parts of the regolith profile.
  
doug smile
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