U–Pb and 40Ar/39Ar geochronological constraints on the tectonic evolution of the easternmost part of the Zambezi orogenic belt, northeast Zimbabwe

Vinyu, M.L.; Hanson, Richard E.; Martin, Mark W.; Bowring, Samuel A.; Jelsma, Hielke A.; Krol, Michael A.; Dirks, Paul H.G.M.

doi:10.1016/s0301-9268(99)00039-x

Cited by 57 publications

(30 citation statements)

References 26 publications

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“…On the other hand, addition of mantle-derived melts to the crust should lead to an elevated crustal geotherm, and high-T, low-P metamorphism should be expected in the lower crust at such time (Warren and Ellis, 1996). Evidence for such metamorphism in an extensional regime related to the Neoproterozoic continental breakup is found in the Zambezi belt and the western sector of the Namaqua metamorphic belt (Robb et al, 1999 andVinyu et al, 1999). The timing of these events in the Angola block and Kalahari craton is essentially the same as the 740-840 Ma detrital zircon age range observed in the Punta Mogotes Formation (Figs.…”

Section: Inferred Source For the Punta Mogotes Formationmentioning

confidence: 99%

The Rio de la Plata craton and the adjoining Pan-African/brasiliano terranes: Their origins and incorporation into south-west Gondwana

et al. 2011

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Section: Inferred Source For the Punta Mogotes Formationmentioning

confidence: 99%

The Rio de la Plata craton and the adjoining Pan-African/brasiliano terranes: Their origins and incorporation into south-west Gondwana

et al. 2011

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“…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%

“…The presence of older metamorphic ages may indicate that collision was diachronous, or they may represent accretionary events between smaller terranes and blocks prior to the main continent-continent collision. Rb-Sr mineral isochrons and 40 Ar/ 39 Ar hornblende spectra from the Zambezi Belt (summarized by Vinyu et al (1999) and Goscombe et al (2000)) yield ages in the range 510-480 Ma and are interpreted to record unroofing of the orogen and cooling below c. 350 8C.…”

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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“…M 2b ages in the Lú rio Belt are generally compatible with ca. 530-510 Ma ages to the west, in the Zambesi-Lufilian Arc-Southern Irumide Belt systems (Vinyu et al 1999;John et al 2004;Johnson et al 2005) and the east (in a Gondwana reconstruction) in the Prydz Bay-Prince Charles mountains (Antarctica) enclaves (Boger et al 2002;Corvino et al 2008;Liu et al 2009). However, older M 2a -type ages (1600-570 Ma; cf.…”

Section: Differential Cooling and The Delamination Modelmentioning

confidence: 99%

Postcollisional High-Grade Metamorphism, Orogenic Collapse, and Differential Cooling of the East African Orogen of Northeast Mozambique

Ueda

Jacobs²,

Thomas³

et al. 2012

The Journal of Geology

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A B S T R A C TThe postcollisional tectonic development of northeast Mozambique and subsequent cooling from high-temperature metamorphism is delineated with an extensive new set of U-Pb titanite, 40 Ar/ 39 Ar hornblende, and 40 Ar/ 39 Ar mica analyses. The complex data suggest a polyphase metamorphic history from the late Neoproterozoic to the Ordovician within the East African-Antarctic Orogen (EAAO), with marked differences between the major constituent blocks. In all the data sets, samples from the basement south of the Lú rio Belt show generally younger ages than those from the north, resulting from a late metamorphic event and slow cooling between ca. 520 and 440 Ma. The ages north and south of the Lú rio Belt are consistently offset by ca. 30-70 Ma, a difference that is maintained and even appears to increase during cooling from very high temperatures to ca. 350ЊC. Based on the first-order assumption that all the ages are cooling ages, cooling rates in the south are estimated at ca. 7Њ-8ЊC/Ma, while those north of the Lú rio Belt are faster at ca. 16ЊC/Ma. The data are consistent with previous geochronological, petrographic, and field data and suggest a late high-temperature/low-pressure metamorphic event that affected only the basement rocks south of the Lú rio Belt and portions of the latter. This late metamorphism and subsequent delayed, slower cooling agree well with a model of elevated heat flow following lithosphere delamination in the southern part of the orogen, which also explains the observed widespread granitoid magmatism, migmatization, and renewed deformation in the southern basement.

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U–Pb and 40Ar/39Ar geochronological constraints on the tectonic evolution of the easternmost part of the Zambezi orogenic belt, northeast Zimbabwe

Cited by 57 publications

References 26 publications

The Rio de la Plata craton and the adjoining Pan-African/brasiliano terranes: Their origins and incorporation into south-west Gondwana

The Rio de la Plata craton and the adjoining Pan-African/brasiliano terranes: Their origins and incorporation into south-west Gondwana

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

Postcollisional High-Grade Metamorphism, Orogenic Collapse, and Differential Cooling of the East African Orogen of Northeast Mozambique

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