Geochronology of the Proterozoic Hartley Basalt formation, South Africa: constraints on the Kheis tectogenesis and the Kaapvaal Craton's earliest Wilson Cycle

Cornell, David H.; Armstrong, Richard; Walraven, F.

doi:10.1016/s0899-5362(97)00133-4

Cited by 87 publications

(95 citation statements)

References 17 publications

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“…Archaean units, which have been dated from the south-western margin of the Kaapvaal Craton, include the Marydale volcanics (Barton et al, 1986) and the Draghoender and Skalkseput granitoids (McCourt et al, 2000a). The Archaean units are overlain by various supracrustal successions, the youngest for which geochronological data are available being basalt of the Hartley Formation, which has a 207 Pb/ 206 Pb zircon evaporation age of 1928 ± 4 Ma (Cornell et al, 1998; confirmed by unpubl. SHRIMP analyses cited in Eglington and Armstrong, 2004).…”

Section: Comparative Geochronologymentioning

confidence: 85%

Evolution of the Namaqua-Natal Belt, southern Africa – A geochronological and isotope geochemical review

Eglington

2006

Journal of African Earth Sciences

170

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Section: Comparative Geochronologymentioning

confidence: 85%

Evolution of the Namaqua-Natal Belt, southern Africa – A geochronological and isotope geochemical review

Eglington

2006

Journal of African Earth Sciences

170

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“…Even if the associated Tsineng dyke swarm extrapolates towards the outlined Soutpansberg "sub-province", its ENE-trend is slightly oblique to the more northerly trending BHDS. Cornell et al (1998), furthermore, on mafic rocks of appropriate age on the Australian continent; e.g., in order to determine whether Pilbara resided along Kaapvaal's eastern "passive" margin (Zegers et al 1998) or its western margin, as suggested by de Kock et al's (2009) "Vaalbara" concept.…”

Section: Linking the 1879-1835 Ma Bhds To Associated Igneous Rocksmentioning

confidence: 99%

Baddeleyite U–Pb ages and gechemistry of the 1875–1835 Ma Black Hills Dyke Swarm across north-eastern South Africa: part of a trans-Kalahari Craton back-arc setting?

Olsson

Klausen

Hamilton

et al. 2015

GFF

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Abstract:Eleven new baddeleyite U-Pb crystallisation ages and associated whole-rock geochemistry on NE-NNEtrending tholeiitic dykes cutting across the north-eastern corner of the Archaean Kaapvaal Craton, the overlying Transvaal basin and the Bushveld and Phalaborwa igneous complexes collective-ly define a 1875-1835 Ma Black Hills Dyke Swarm (BHDS). Dyke ages do not discriminate between dyke trends or geographic location, but subdivide the BHDS into an older set of four more primitive dykes (MgO = 9.4-6.8 wt.%) and a younger set of seven dykes with more differentiated compositions (MgO = 5.6-4.2 wt.%). Despite being emplaced over a c. 40 Myr period, major element compositions are remarkably consistent with a single inversely modelled bulk fractionating assemblage of 57.5% plagi-oclase, 29.5% augite and 13.0% olivine. This fractionating assemblage requires an additional assimilation of bulk continental crust (at a low rvalue of 0.2) for reversed modelling of parental rare earth elements. Even though this crustal assimilation indicates that primary magmas could potentially have been derived from a spinel-bearing ambient primordial and asthenospheric mantle source, anomalously low Nb and high Pb values for the more primitive older dykes may also have been inherited from a sub-continental lithospheric mantle source. The ages for the BHDS bridge a gap between c. 1889 and 1867 Ma mafic sills and c. 1830 Ma rhyodacitic pyroclasts, interbedded in the top of a ~3 km-thick Sibasa basalt sequence, which combine into a continuous c. 1.89-1.83 Ga igneous province. Similar geochemical signatures are consistent with all sills, volcanic rocks and BHDS feeders collectively belonging to a very voluminous and coherent igneous province, which arguably formed behind active Magondi and Okwa-Kheis arcs, along the western margin of the proto-Kalahari Craton.

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“…These authors suggest that the collective data from the ( Fig. 1) Hartley basalts in the west (Cornell et al, 1998), the Trompsburg Complex in the south (Maier et al, 2003), the Moshaneng Dolerite to the north in Botswana and possibly even the Sebanga dykes on the Zimbabwe Craton (Hanson et al, 2004) indicate widespread Palaeoproterozoic intraplate magmatism, as also pointed out by Maier et al (2003). This lends support to the proposed occurrence of a global 1.9 Ga superplume event (Condie et al, 2001).…”

Section: Introductionmentioning

confidence: 56%

The Trompsburg Complex, South Africa: A preliminary three dimensional model

Maré

Cole

2006

Journal of African Earth Sciences

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Geochronology of the Proterozoic Hartley Basalt formation, South Africa: constraints on the Kheis tectogenesis and the Kaapvaal Craton's earliest Wilson Cycle

Cited by 87 publications

References 17 publications

Evolution of the Namaqua-Natal Belt, southern Africa – A geochronological and isotope geochemical review

Evolution of the Namaqua-Natal Belt, southern Africa – A geochronological and isotope geochemical review

Baddeleyite U–Pb ages and gechemistry of the 1875–1835 Ma Black Hills Dyke Swarm across north-eastern South Africa: part of a trans-Kalahari Craton back-arc setting?

The Trompsburg Complex, South Africa: A preliminary three dimensional model

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