Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Lu-hf analyses of zircon from the Makoppa Dome and Amalia-Kraaipan area; implications for evolution of the Kimberley and Pietersburg blocks of the Kaapvaal Craton

M. A. Elburg and M. Poujol
Lu-hf analyses of zircon from the Makoppa Dome and Amalia-Kraaipan area; implications for evolution of the Kimberley and Pietersburg blocks of the Kaapvaal Craton
South African Journal of Geology (July 2020) 123 (3): 369-380

Abstract

Previously dated zircon crystals from the Amalia-Kraaipan granite-greenstone belts and Makoppa Dome were analysed for their Lu-Hf isotopic characteristics to refine the geological evolution of these areas. Samples from the Makoppa Dome, belonging to the Pietersburg Block, largely fall within the epsilon Hf-age range for granitoids from the eastern part of the block. However, the oldest 3.01 to 3.03 Ga trondhjemitic gneisses show that reworking of juvenile mafic crust started earlier in the western than the eastern part of the block, suggesting a diachronous tectonic evolution. The three granitoids from the Amalia-Kraaipan area fall within the field for Pietersburg and Kimberley block granitoids. Contribution from older crustal material is seen in a 3.08 Ga schist, likely derived from a volcanic protolith, from the Madibe Belt, in the far east of the Kimberley Block, with a mantle extraction age of 3.25 to 3.45 Ga. The data suggest that the Kimberley Block, like the Pietersburg Block, also contains (minor) ancient crustal components, derived from a depleted mantle source prior to 3.1 Ga. The new data suggest that the Kimberley and Pietersburg blocks underwent a very similar Paleo- to Mesoarchean crustal evolution, with a major crust formation event at 3.1 to 3.0 Ga followed by successive crust reworking until 2.77 Ga. Lavas of the Ventersdorp Supergroup, for which zircon grains from a ca. 2.75 lapilli tuff give epsilon Hfi of +2, are the first evidence of a juvenile source, after 300 Myr of crustal reworking.


ISSN: 1012-0750
EISSN: 1996-8590
Serial Title: South African Journal of Geology
Serial Volume: 123
Serial Issue: 3
Title: Lu-hf analyses of zircon from the Makoppa Dome and Amalia-Kraaipan area; implications for evolution of the Kimberley and Pietersburg blocks of the Kaapvaal Craton
Affiliation: University of Johannesburg, Department of Geology, Johannesburg, South Africa
Pages: 369-380
Published: 20200729
Text Language: English
Publisher: Bureau for Scientific Publications, Pretoria, South Africa
References: 33
Accession Number: 2020-063335
Categories: Solid-earth geophysicsGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, geol. sketch maps
S23°53'60" - S23°53'60", E29°26'60" - E29°26'60"
S28°43'60" - S28°43'60", E24°46'00" - E24°46'00"
Secondary Affiliation: University of Rennes, FRA, France
Country of Publication: South Africa
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Abstract, Copyright, Geological Society of South Africa. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202039
Close Modal

or Create an Account

Close Modal
Close Modal