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Geochemical signature of mineralization in weathered sediments and bedrock, Thunderdome Prospect, Broken Hill region, western New South Wales, Australia; implications for mineral exploration under cover

Eric Tonui, Patrice de Caritat and Wolfgang Leyh
Geochemical signature of mineralization in weathered sediments and bedrock, Thunderdome Prospect, Broken Hill region, western New South Wales, Australia; implications for mineral exploration under cover
Geochemistry - Exploration, Environment, Analysis (August 2003) 3 (3): 263-280

Abstract

The stratiform Pb-Ag-Zn and stratabound Cu-Au mineralization of the Thunderdome Prospect, located in the Mundi Mundi Plain 50 km NW of Broken Hill, NSW, is covered by c. 200 m of sediments. A downhole mineralogical and geochemical dispersion study was carried out on 245 regolith samples from six exploration drillholes to establish if geochemical dispersion from the mineralization could be identified in the overlying cover. This was achieved using a combination of qualitative and quantitative XRD, Portable Infrared Mineral Analyzer (PIMA) and XRF techniques. The stratigraphy is defined by a variable thickness of diagenetically modified and weathered Cenozoic sediments (and soil) overlying the weathered Proterozoic basement, which hosts the mineralization. The composition of the sediments and saprolite appears to have been influenced by chemical dispersion from underlying mineralization, as shown by anomalous concentrations of Cu (up to c. 13 times above background), Ni (c. 9 times), As, Zn, Pb and Co (all c. 3 times) among others. Some of these anomalies are widespread and may be either clastic or related to adsorption on clay minerals, Fe-oxides and neoformed, poorly crystalline mineral phases. The precise transport mechanisms from the underlying mineralization need to be tested in order to gain further insights into geochemical dispersion processes under cover.


ISSN: 1467-7873
EISSN: 2041-4943
Serial Title: Geochemistry - Exploration, Environment, Analysis
Serial Volume: 3
Serial Issue: 3
Title: Geochemical signature of mineralization in weathered sediments and bedrock, Thunderdome Prospect, Broken Hill region, western New South Wales, Australia; implications for mineral exploration under cover
Affiliation: Geoscience Australia, Cooperative Research Centre for Landscape Evolution and Mineral Exploration (CRC LEME), Canberra, Australia
Pages: 263-280
Published: 200308
Text Language: English
Publisher: Geological Society Publishing House, London, United Kingdom
References: 48
Accession Number: 2004-026125
Categories: Economic geology, geology of ore depositsGeochemistry of rocks, soils, and sediments
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., 5 tables, sketch map
S32°30'00" - S31°00'00", E141°00'00" - E142°00'00"
Secondary Affiliation: University of Canberra, AUS, AustraliaEaglehawk Geological Consulting Pty, AUS, Australia
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 200408
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