Geochronology of Gaborone Granite Complex extensions in the area north of Mafikeng, South Africa

Grobler, D. F.; Walraven, F.

doi:10.1016/0009-2541(93)90134-5

Cited by 41 publications

(11 citation statements)

References 9 publications

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“…The granite greenstone terrain is intruded by the ~2.78 Ga Gaborone Igneous Complex (Grobler and Walraven, 1993;Moore et al, 1993;Walraven et al, 1996;Wingate, 1998). The granite greenstone terrain is intruded by the ~2.78 Ga Gaborone Igneous Complex (Grobler and Walraven, 1993;Moore et al, 1993;Walraven et al, 1996;Wingate, 1998).…”

Section: Previous Geochronological Workmentioning

confidence: 99%

“…Eighteen analyses were done on separate grains with the data reported in Table 2 group straddling the concordia curve. This magmatic event includes the Gaborone Igneous Complex (Grobler and Walraven, 1993;Moore et al, 1993;Walraven et al, 1996;Chaoka et al, 2003) which abuts the Colesberg magnetic lineament (Figure 1b). Regression analysis of the data set as a whole yields an upper intercept age of 2781.6±5.6 Ma.…”

Section: Red Granite Met 7/15mentioning

confidence: 99%

“…The Kraaipan Group is associated with a "basement complex" made up of granitoids and gneisses. The Gaborone Igneous Complex yielded U-Pb zircon and Pb-Pb zircon date of 2780±4 Ma (Grobler and Walraven, 1993;Moore et al, 1993;Walraven et al, 1996). The Gaborone Igneous Complex yielded U-Pb zircon and Pb-Pb zircon date of 2780±4 Ma (Grobler and Walraven, 1993;Moore et al, 1993;Walraven et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

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SHRIMP U-Pb zircon ages of granitoids from the Western Domain of the Kaapvaal Craton, Southeastern Botswana: implications for crustal evolution

Mapeo

Armstrong

Kampunzu

et al. 2004

South African Journal of Geology

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SHRIMP U-Pb zircon dating of granitoids from borehole cores from the Amalia-Kraaipan granite-greenstone terrain of southeast Botswana yielded dates of: 2939±9 Ma for the biotite granite gneiss, 2943±9 Ma for the pink granite and 2782±6 Ma for the red granite. These dates define two main granite magmatic events in the Western Domain of the Kaapvaal Craton at ~2.96 to ~2.94 Ga and ~2.78 Ga. In the Kaapvaal Shield the main magmatic events are dated at ~3.5 to ~3.3, ~3.2 to ~3.1, ~2.96 to ~2.94 and ~2.78 Ga. The two domains were therefore affected by coeval igneous events at ~2.96 to ~2.94 Ga and ~2.78 Ga and therefore the age of ~2.96 to ~2.94 Ga is taken to date their amalgamation along the Colesberg lineament. The ages of ~2.78 Ga correspond to the emplacement of the Gaborone Igneous Complex of southeast Botswana, which is possibly related to the reactivation of or renewed igneous activity along the Colesberg lineament.

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Section: Previous Geochronological Workmentioning

confidence: 99%

Section: Red Granite Met 7/15mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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SHRIMP U-Pb zircon ages of granitoids from the Western Domain of the Kaapvaal Craton, Southeastern Botswana: implications for crustal evolution

Mapeo

Armstrong

Kampunzu

et al. 2004

South African Journal of Geology

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“…The zircon evaporation technique utilised follows published techniques (Kober, 1986(Kober, , 1987. The specific application at the Council for Geoscience has been documented elsewhere (Grobler and Walraven, 1993). Data for each grain analysed were collected in blocks of 8-15 ratios at varying temperatures or until no lead was evaporated at a given temperature.…”

Section: Analytical Proceduresmentioning

confidence: 99%

Zircon geochronology of the Oribi Gorge Suite, KwaZulu-Natal, South Africa: constraints on the timing of trans-current shearing in the Namaqua–Natal Belt

Eglington

Thomas

Armstrong

et al. 2003

Precambrian Research

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“…1), a lithostratigraphically similar succession of flood basalts within the Derdepoort Formation was correlated to the Klipriviersberg Group (e.g., Tyler, 1979). The Derdepoort Formation, however, was inferred by Wingate (1998) Grobler and Walraven, 1993;Moore et al, 1993;Walraven et al, 1996), while the Modipe Complex gabbro and Gabarone Complex granite ( Fig. 1) have yielded ages between 2784 Ma and 2779 Ma, respectively (Grobler and Walraven, 1993;Moore et al, 1993;Mapeo et al, 2004;Denyszyn et al, 2013).…”

Section: Regional Geologymentioning

confidence: 94%

Neoarchean large igneous provinces on the Kaapvaal Craton in southern Africa re-define the formation of the Ventersdorp Supergroup and its temporal equivalents

et al. 2020

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U-Pb geochronology on baddeleyite is a powerful technique that can be applied effectively to chronostratigraphy. In southern Africa, the Kaapvaal Craton hosts a wellpreserved Mesoarchean to Paleoproterozoic geological record, including the Neoarchean Ventersdorp Supergroup. It overlies the Witwatersrand Supergroup and its world-class gold deposits. The Ventersdorp Supergroup comprises the Klipriviersberg Group, Platberg Group, and Pniel Group. However, the exact timing of formation of the Ventersdorp Supergroup is controversial. Here we present 2789 ± 4 Ma and 2787 ± 2 Ma U-Pb isotope dilution-thermal ionization mass spectrometry (ID-TIMS) baddeleyite ages and geochemistry on mafic sills intruding the Witwatersrand Supergroup, and we interpret these sills as feeders to the overlying Klipriviersberg Group flood basalts. This constrains the age of the Witwatersrand Supergroup and gold mineralization to at least ca. 2.79 Ga. We also report 2729 ± 5 Ma and 2724 ± 7 Ma U-Pb ID-TIMS baddeleyite ages and geochemistry from a mafic sill intruding the Pongola Supergroup and on an east-northeast-trending mafic dike, respectively. These new ages distinguish two of the Ventersdorp Supergroup magmatic events: the Klipriviersberg and Platberg. The Ventersdorp Supergroup can now be shown to initiate and terminate with two large ig-neous provinces (LIPs), the Klipriviersberg and Allanridge, which are separated by Platberg volcanism and sedimentation. The age of the Klipriviersberg LIP is 2791-2779 Ma, and Platberg volcanism occurred at 2754-2709 Ma. The Allanridge LIP occurred between 2709-2683 Ma. Klipriviersberg, Platberg, and Allanridge magmatism may be genetically related to mantle plume(s). Higher heat flow and crustal melting resulted as a mantle plume impinged below the Kaapvaal Craton lithosphere, and this was associated with rifting and the formation of LIPs.

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Geochronology of Gaborone Granite Complex extensions in the area north of Mafikeng, South Africa

Cited by 41 publications

References 9 publications

SHRIMP U-Pb zircon ages of granitoids from the Western Domain of the Kaapvaal Craton, Southeastern Botswana: implications for crustal evolution

SHRIMP U-Pb zircon ages of granitoids from the Western Domain of the Kaapvaal Craton, Southeastern Botswana: implications for crustal evolution

Zircon geochronology of the Oribi Gorge Suite, KwaZulu-Natal, South Africa: constraints on the timing of trans-current shearing in the Namaqua–Natal Belt

Neoarchean large igneous provinces on the Kaapvaal Craton in southern Africa re-define the formation of the Ventersdorp Supergroup and its temporal equivalents

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