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Geochemistry and mineralogy of the regolith profile over the Aries kimberlite pipe, Western Australia

Balbir Singh and Matthias Cornelius
Geochemistry and mineralogy of the regolith profile over the Aries kimberlite pipe, Western Australia
Geochemistry - Exploration, Environment, Analysis (November 2006) 6 (4): 311-323

Abstract

Residual regolith over the Aries kimberlite pipe, situated in the central Kimberley Block of Western Australia, consists of lateritic duricrust, mottled zone, upper saprolite, lower saprolite and saprock. Duricrust and mottled zone are dominated by goethite and kaolinite while saprolite consists mostly of smectite with minor amounts of mica and serpentine. Most kimberlite indicator minerals except chromite have been weathered. Kimberlitic rock fabric is preserved in the regolith up to the top of saprolite. Chromium, Ni, Co, Cu, Nb, Zr, Ti, P and rare earth elements (REE) are significantly enriched in the mottled zone and duricrust relative to the saprolite and fresh kimberlite. Vanadium, Sb, As, Mo and U, derived from the sediments and basaltic rocks around the pipe, are also enriched. Goethite partly hosts Cr, Ni, and Co, and Nb and REE are associated with anatase. The clay fractions of the mottled zone and saprolite contain significant quantities of Cr, Co, Cu, Ni, Zr, Ga, Ti, Nb, Zn and REE. A suite of six trace elements comprising those associated with ultramafic rocks (Cr and Co) and felsic rocks (Nb, La, Sm and P) can readily distinguish the kimberlitic laterite from that derived from ultramafic or felsic rocks.


ISSN: 1467-7873
EISSN: 2041-4943
Serial Title: Geochemistry - Exploration, Environment, Analysis
Serial Volume: 6
Serial Issue: 4
Title: Geochemistry and mineralogy of the regolith profile over the Aries kimberlite pipe, Western Australia
Affiliation: University of South Australia, Centre for Environmental Risk Assessment and Remediation, Mawson Lakes, South Aust., Australia
Pages: 311-323
Published: 200611
Text Language: English
Publisher: Geological Society Publishing House, London, United Kingdom
References: 29
Accession Number: 2007-008124
Categories: Geochemistry of rocks, soils, and sedimentsEconomic geology, geology of nonmetal deposits
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, sketch map
S17°15'00" - S16°30'00", E126°00'00" - E126°30'00"
Secondary Affiliation: CSIRO Exploration and Mining, 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: 200704
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