Structural relations and PbPb zircon ages for the Makuti gneisses: evidence for a crustal-scale Pan-African shear zone in the Zambezi Belt, northwest Zimbabwe

Dirks, Paul H.G.M.; Kröner, Alfred; Jelsma, Hielke A.; Sithole, T.A.; Vinyu, M.L.

doi:10.1016/s0899-5362(99)00013-5

Cited by 23 publications

(22 citation statements)

References 20 publications

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“…The Zambezi Belt could, therefore, be interpreted as a collisional suture between two widely separated cratons (the Congo and Kalahari), so that rocks such as the Nchanga Granite on the Congo Craton cannot be genetically related to similar aged units in the Zambezi Belt, which were on the northern edge of the Kalahari Craton. Furthermore, the interpretation of the Zambezi Belt supracrustals, which include the Makuti Group of NW Zimbabwe, as a bimodal rift sequence (Munyanyiwa et al, 1997), has been questioned by Dirks et al (1999) who showed that rocks described as ''metaarkoses'' (Broderick, 1976) and ''meta-rhyolites'' (Munyanyiwa et al, 1997) are in fact sheared granites. The age of the Nchanga Granite is similar to, but slightly older than, those of the Lusaka Granite (842 ± 33 Ma; recalculated from Barr et al, 1978), the Ngoma Gneiss in the Zambezi Belt (820 ± 7 Ma; Hanson et al, 1988), and a megacrystic granite dated at 852 ± 11 Ma in the Tsumkwe area near the southern edge of the Congo Craton (Hoal et al, 2000).…”

Section: Discussionmentioning

confidence: 99%

Geochronology of the Nchanga Granite, and constraints on the maximum age of the Katanga Supergroup, Zambian Copperbelt

Armstrong

Master

Robb

2005

Journal of African Earth Sciences

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Section: Discussionmentioning

confidence: 99%

Geochronology of the Nchanga Granite, and constraints on the maximum age of the Katanga Supergroup, Zambian Copperbelt

Armstrong

Master

Robb

2005

Journal of African Earth Sciences

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“…Recent geological, structural and geochronological data from the Zambezi Belt (e.g. Dirks et al 1999;Vinyu et al 1999) and central Dronning Maud Land (e.g. Jacobs et al 1998Jacobs et al , 1999Jacobs et al , 2003Bauer et al 2003)-Shackleton Range (Buggisch et al 1990Talarico et al 1999) support the idea that they contain the suture.…”

Section: Sutures Within East Gondwanamentioning

confidence: 97%

Role of Pan-African events in the Circum-East Antarctic Orogen of East Gondwana: a critical overview

Yoshida¹,

Jacobs

Santosh

et al. 2003

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Recent studies of Pan-African events in East Gondwana are critically reviewed, particularly recent models of amalgamation of East Gondwana during the Pan-African period. It is pointed out that critical data are insufficient to constrain the newly proposed models and so the classical model of the Grenvillian Circum-East Antarctic Orogen cannot yet be replaced. Grenvillian tectonothermal events with a peak between 1.0 and 1.2 Ga assembled different crustal blocks of the East Antarctic Shield with different geohistories. Pan-African tectonothermal reworking took place over wide but selected areas of the orogen. Careful geochronological studies, including SHRIMP dating associated with structural and petrological investigations to correlate ages with those events, are shown to be important, since fluid-rich and/or deformational conditions are equally effective as temperature conditions for mineral recrystallization and resetting of isotopic systematics. Pan-African suture zones, one extending from the Mozambique Belt to the Shackleton Range and another connecting the Mozambique Belt to the Zambezi Belt, are equally possible, although the width of the southern Mozambique Ocean is poorly understood. The extent of Pan-African sutures in the Prydz Bay area is enigmatic, although they represent definite orogens. Palaeomagnetic

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“…In northeastern Zimbabwe, where metamorphic grade is in the amphibolite facies, the suite consists of basal quartzite or psammite overlain by a structural package of pelite, quartzite and marble (Barton et al 1991;Hargrove et al 2003), with volcanic and plutonic rocks dated between 808 and 795 Ma 84,85,89 . Farther west, abundant peralkaline sheets were emplaced along with mafic magmas, in a continental rift setting, presumably through the Palaeoproterozoic Magondi Belt (Munyanyiwa et al 1997;Dirks et al 1999). Igneous zircons from granitic gneisses have yielded a TIMS age of 831 AE 6 Ma 90 and Pb/Pb evaporation ages that range from 854 AE 0.8 to 737 AE 0.9 Ma 91-95 .…”

Section: Neoproterozoic Magmatism Rifting and Sedimentary Basinsmentioning

confidence: 99%

“…The Lufilian and Zambezi Belts are characterized by thin-and thick-skinned thrusting, respectively, and the polarity of thrusting in the Lufilian-Zambezi Orogen is illustrated in Figure 7. In the Zambezi Belt north of the Zambezi Valley, thrust transport was toward the NNE-NE Hanson et al 1994;, whereas structures along the northern Kalahari margin are consistently SSE-verging (Barton et al 1991;Dirks et al 1999;Vinyu et al 1999;Müller et al 2001), indicating that the Lufilian-Zambezi Orogen was doubly vergent. Considering their spatial distribution, the orogen appears to have the architecture of an asymmetric, orogenic-scale structural fan.…”

Section: Neoproterozoic Ophiolites and Continental-margin-arc Magmatismmentioning

confidence: 99%

A review of the Mesoproterozoic to early Palaeozoic magmatic and tectonothermal history of south–central Africa: implications for Rodinia and Gondwana

Johnson

Rivers

Waele

2005

JGS

159

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This paper provides a review of the tectonic evolution of central-southern Africa from Mesoproterozoic to earliest Palaeozoic times, using available geological information and a robust U-Pb zircon database. During the late Mesoproterozoic, the southern margin of the Congo-Tanzania-Bangweulu Craton was characterized by suprasubduction-zone magmatism and the accretion of arc and microcontinental fragments. Magmatism within the adjacent Irumide Belt formed by recycling of older continental crust. Ophiolite blocks, possibly part of an olistostromal mélange, are present in a Neoproterozoic sequence overlying the Irumide Belt, and the occurrence of high-pressure/low-temperature subduction-zone metamorphism and protracted Neoproterozoic suprasubduction-zone magmatism demonstrates that there was an ocean to the south (present-day coordinates) of the Congo-Tanzania-Bangweulu Craton until the amalgamation of Gondwana at 550-520 Ma, indicating that the Congo-Tanzania-Bangweulu Craton was not part of Rodinia. On the basis of their different ages and styles of magmatism, the Mesoproterozoic Kibaran Belt, ChomaKalomo Block and Irumide Belt are not components of the same orogen, therefore precluding a sub-Saharanwide, linked 'Kibaran' (sensu lato) orogenic event. Evidence is presented to illustrate that the CongoTanzania-Bangweulu and Kalahari Cratons developed independently until their final collision during the PanAfrican Orogeny along the Damara-Lufilian-Zambezi Orogen at c. 550-520 Ma.

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Structural relations and PbPb zircon ages for the Makuti gneisses: evidence for a crustal-scale Pan-African shear zone in the Zambezi Belt, northwest Zimbabwe

Cited by 23 publications

References 20 publications

Geochronology of the Nchanga Granite, and constraints on the maximum age of the Katanga Supergroup, Zambian Copperbelt

Geochronology of the Nchanga Granite, and constraints on the maximum age of the Katanga Supergroup, Zambian Copperbelt

Role of Pan-African events in the Circum-East Antarctic Orogen of East Gondwana: a critical overview

A review of the Mesoproterozoic to early Palaeozoic magmatic and tectonothermal history of south–central Africa: implications for Rodinia and Gondwana

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