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Catchment-based gold prospectivity analysis combining geochemical, geophysical and geological data across northern Australia

M. J. Cracknell and P. de Caritat
Catchment-based gold prospectivity analysis combining geochemical, geophysical and geological data across northern Australia
Geochemistry - Exploration, Environment, Analysis (June 2017) 17 (3): 204-216

Abstract

The results of a pilot study into the application of an unsupervised clustering approach to the analysis of catchment-based National Geochemical Survey of Australia (NGSA) geochemical data combined with geophysical and geological data across northern Australia are documented. NGSA Mobile Metal Ion (super (Registered trademark)) (MMI) element concentrations and first and second order statistical summaries across catchments of geophysical data and geological data are integrated and analysed using Self-Organizing Maps (SOM). Input features that contribute significantly to the separation of catchment clusters are objectively identified and assessed.A case study of the application of SOM for assessing the spatial relationships between Au mines and mineral occurrences in catchment clusters is presented. Catchments with high mean Au code-vector concentrations are found downstream of areas known to host Au mineralization. This knowledge is used to identify upstream catchments exhibiting geophysical and geological features that indicate likely Au mineralization. The approach documented here suggests that catchment-based geochemical data and summaries of geophysical and geological data can be combined to highlight areas that potentially host previously unrecognised Au mineralization.


ISSN: 1467-7873
EISSN: 2041-4943
Serial Title: Geochemistry - Exploration, Environment, Analysis
Serial Volume: 17
Serial Issue: 3
Title: Catchment-based gold prospectivity analysis combining geochemical, geophysical and geological data across northern Australia
Affiliation: University of Tasmania, Centre of Excellence in Ore Deposits, Hobart, Tasmania, Australia
Pages: 204-216
Published: 20170601
Text Language: English
Publisher: Geological Society Publishing House, London, United Kingdom
Number of pages: unpaginated
References: 77
Accession Number: 2017-056523
Categories: General geochemistryEconomic geology, geology of ore deposits
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, geol. sketch maps
S25°00'00" - S15°00'00", E132°00'00" - E141°00'00"
Secondary Affiliation: Geoscience Australia, AUS, Australia
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201730
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