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Multi-scale spatial distribution of K, Th and U in an Archaean potassic granite; a case study from the Heerenveen Batholith, Barberton granite-greenstone terrain, South Africa

Jean-Francois Moyen, Michel Cuney, David Baratoux, Paul Sardini and S. Carrouee
Multi-scale spatial distribution of K, Th and U in an Archaean potassic granite; a case study from the Heerenveen Batholith, Barberton granite-greenstone terrain, South Africa
South African Journal of Geology (February 2021) 124 (1): 53-86

Abstract

We describe the multi-scale distribution of K, Th and U in the ca. 3.1 Ga Heerenveen batholith of the Barberton Granite-Greenstone Terrain. Data were obtained with a combination of tools, including a portable gamma-ray spectrometer from the scale of the whole batholith to the scale of outcrops, and autoradiography for the thin section scale. U is concentrated preferentially in minor phases in the border shear zones of the batholith and, within these shear zones, in late pegmatites as well as fractures. The processes responsible for the concentration of U in the Heerenveen batholith is discussed in terms of magmatism, hydrothermalism (redistribution of U in fissures associated with magmato-hydrothermal fluids), and supergene alteration. The statistical properties of K, Th and U concentrations are different. K shows spatial correlation over large distance, largely mirroring mappable rock types, with increased variability at larger scales. In contrast, U is dominated by small-scale variations ("nugget effect") and its variability is, averaged and smoothed by large-scale integration. Spatial and statistical features thus offer useful and complementary insights on petrogenetic and metallogenic processes in granitoids in addition to standard approaches (petrography, geochemistry).


ISSN: 1012-0750
EISSN: 1996-8590
Serial Title: South African Journal of Geology
Serial Volume: 124
Serial Issue: 1
Title: Multi-scale spatial distribution of K, Th and U in an Archaean potassic granite; a case study from the Heerenveen Batholith, Barberton granite-greenstone terrain, South Africa
Affiliation: Universite de Lyon, Laboratoire Magmas et Volcans, Saint Etienne, France
Pages: 53-86
Published: 20210213
Text Language: English
Publisher: Bureau for Scientific Publications, Pretoria, South Africa
References: 135
Accession Number: 2021-043787
Categories: Isotope geochemistryIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. charts, 5 tables, geol. sketch maps
S27°00'00" - S18°00'00", E18°00'00" - E30°00'00"
Secondary Affiliation: Universite de Lorraine, FRA, FranceUniversite Paul Sabatier, FRA, FranceUniversite de Poitiers, FRA, FranceUniversite de Lyon, FRA, France
Country of Publication: South Africa
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute. Abstract, Copyright, Geological Society of South Africa. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202130
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