Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Delineating alteration footprints from field and ASTER SWIR spectra, geochemistry, and gamma-ray spectrometry above regolith-covered base metal deposits; an example from Abra, Western Australia

Heta M. Lampinen, Carsten Laukamp, Sandra A. Occhipinti, Vaclav Metelka and Samuel C. Spinks
Delineating alteration footprints from field and ASTER SWIR spectra, geochemistry, and gamma-ray spectrometry above regolith-covered base metal deposits; an example from Abra, Western Australia
Economic Geology and the Bulletin of the Society of Economic Geologists (December 2017) 112 (8): 1977-2003

Abstract

Shortwave infrared (SWIR) field and laboratory reflectance spectra were used to identify and characterize mineral assemblages in regolith within a study area around the Abra base metal deposit. The Abra deposit is situated at 300-m depth from surface and hosted by weathered sedimentary rocks of the Mesoproterozoic Edmund Group of the Capricorn Orogen of Western Australia. The deposit contains a chlorite-siderite (+ or -white mica) alteration halo delineated from drill core, surrounded with host rocks that are modally poor in detrital and metamorphic chlorite and white mica. Mineral assemblages identified from the regolith SWIR data, which were verified through XRD analysis and preexisting geochemistry data, were used to identify three schematic SWIR mineral domains in the regolith. These domains are (1) poorly crystalline kaolinite in an extremely weathered transported regolith, (2) well-crystalline kaolinite and muscovite in regolith overlying unaltered bedrock, and (3) phengite + or - chlorite + or - well-crystalline kaolinite mineral footprint in regolith overlying the Abra deposit and nearby base metal prospects. Furthermore, we identified that the mineral footprint detected from regolith samples can be traced in a combined potassium gamma-ray spectrometry and ASTER AlOH group composition map. The combined use of mineralogical and geophysical remote sensing data, and the strategically planned ground validation through mineralogical and geochemical sampling, proved to be a powerful and cost-effective exploration method for regional mapping of mineral footprints potentially related to sedimentary rock-hosted base metal.


ISSN: 0361-0128
EISSN: 1554-0774
Coden: ECGLAL
Serial Title: Economic Geology and the Bulletin of the Society of Economic Geologists
Serial Volume: 112
Serial Issue: 8
Title: Delineating alteration footprints from field and ASTER SWIR spectra, geochemistry, and gamma-ray spectrometry above regolith-covered base metal deposits; an example from Abra, Western Australia
Affiliation: University of Western Australia, School of Earth Sciences, Perth, West Aust., Australia
Pages: 1977-2003
Published: 201712
Text Language: English
Publisher: Economic Geology Publishing Company, Lancaster, PA, United States
References: 129
Accession Number: 2018-027467
Categories: Economic geology, geology of ore deposits
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., strat. cols., 3 tables, geol. sketch maps
S25°00'00" - S24°00'00", E117°45'00" - E118°45'00"
Secondary Affiliation: CSIRO Mineral Resources, AUS, Australia
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Abstract, Copyright, Society of Economic Geologists. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2018
Close Modal

or Create an Account

Close Modal
Close Modal