The Mesoproterozoic Irumide belt of Zambia

Waele, Bert De; Kampunzu, A.B.; Mapani, Benjamin; Tembo, F.

doi:10.1016/j.jafrearsci.2006.01.018

Cited by 106 publications

(89 citation statements)

References 53 publications

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“…Peak metamorphism in the Irumide Belt is constrained at between 1021 ± 16 and 1018 ± 5 Ma through U-Pb SHRIMP dating of low Th/U zircon rim overgrowths (De Waele, 2005). This tectonic event was accompanied by the intrusion of numerous high-K granitoids between 1055 ± 13 and 1003 ± 31 Ma , 2006aDe Waele, 2005) with the bulk of intrusions being contemporaneous with peak metamorphism at ca. 1020 Ma.…”

Section: The Irumide Beltmentioning

confidence: 99%

Palaeoproterozoic to Neoproterozoic growth and evolution of the eastern Congo Craton: Its role in the Rodinia puzzle

Waele

Johnson

Pisarevsky

2008

Precambrian Research

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221

103

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Section: The Irumide Beltmentioning

confidence: 99%

Palaeoproterozoic to Neoproterozoic growth and evolution of the eastern Congo Craton: Its role in the Rodinia puzzle

Waele

Johnson

Pisarevsky

2008

Precambrian Research

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221

103

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“…De Waele et al (2006a), using whole-rock geochemistry and Sr-Nd isotopic data on granitoids and volcanic rocks from the Bangweulu Block and Irumide Belt of Zambia, recognised four main igneous events, named the Usagaran phase (2.05-1.93 Ga), the Ubendian phase (1.88-1.85 Ga), the Lukamfwa phase (1.65-1.55 Ga) and the Irumide phase (1.05-0.95 Ga). According to these authors, the T DM model ages of 3.3-2.8 Ga for granitoids and 2.9-2.4 Ga for volcanic rocks indicate the presence of a preponderant Archean crust within the Bangweulu Block and within the Irumide Belt.…”

Section: Paleoproterozoic Basementmentioning

confidence: 99%

U–Pb and Hf-isotope analyses of zircon from the Kundelungu Kimberlites, D.R. Congo: Implications for crustal evolution

Batumike

O’Reilly

Griffin

et al. 2007

Precambrian Research

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The Gungwania and Talala kimberlitic pipes on the Kundelungu Plateau (Katanga, SE Congo) have been used as drillholes, to obtain crustal zircons for a study of crustal evolution in the region and to constrain the age of the basement and the sedimentary provenance of the Katangan Supergroup. Two hundred and twenty-nine zircon grains were analysed for U-Pb ages and Hf-isotope compositions. Juvenile Mesoarchean (∼3.4-3.3 Ga) crust in the region underwent recycling during Neoarchean and Paleoproterozoic time. The Paleoproterozoic event involved little production of juvenile crust, and this Paleoproterozoic crust was recycled during Mesoproterozoic and Neoproterozoic time. Both the Mesoproterozoic and Neoproterozoic were characterised by bimodal magmatism reflecting extension, linked with the break up of Rodinia and the opening of the Katangan basin, and the development of juvenile crust. Detailed studies of the external morphology of the zircons in different age groups suggest that the basement beneath the Kundelungu region is predominantly Paleoproterozoic in age; other zircon populations may be derived from the Katangan sediments. The absence of any zircons younger than 560 Ma supports deposition of the Biano Subgroup, which hosts the kimberlites, during the Pan-African Lufilian orogeny. The Archean Congo and Zimbabwe cratons, the Paleoproterozoic Ubendian Belt (Bangweulu Block), the Paleo-to-Mesoproterozoic Irumide Belt, the Mesoproterozoic Kibaran Belt and the Choma Kalomo Block may all have contributed material to the sediments of the Katangan Supergroup.

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“…In fact, geochronological evidence suggests that the Bangweulu Block was once a larger craton, but multiple metacratonization events along its southern margin diminished its size and formed the Irumide Belt [De Waele et al, 2009;De Waele et al, 2006a;De Waele et al, 2006b]. With this in mind, the Irumide Belt may have had thicker cratonic lithosphere at one time, but it was partially delaminated [Liégeois et al, 2013] resulting in the lithospheric structure observed in our electrical model.…”

Section: Elua Precambrian Lithospheric Structurementioning

confidence: 78%

“…1) [Ackermann, 1950;Ackermann, 1960;Daly, 1986]. Detailed geochronological studies by De Waele et al [2003;2006a;2006b; and [Johnson et al, 2005; established four lithotectonic units for the Irumide Belt. (1) Paleoproterozic (2.05-1.96 Ga) with minor Archean (2.7 Ga) crystalline granitic gneissic basement complex.…”

Section: The Irumide and Southern Irumide Beltmentioning

confidence: 99%

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Geophysical and petrological constraints on ocean plate dynamics

Sarafian¹

2017

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This thesis investigates the formation and subsequent motion of oceanic lithospheric plates through geophysical and petrological methods. Ocean crust and lithosphere forms at mid-ocean ridges as the underlying asthenosphere rises, melts, and flows away from the ridge axis. In Chapters 2 and 3, I present the results from partial melting experiments of mantle peridotite that were conducted in order to examine the mantle melting point, or solidus, beneath a mid-ocean ridge. Chapter 2 determines the peridotite solidus at a single pressure of 1.5 GPa and concludes that the oceanic mantle potential temperature must be ~60 ºC hotter than current estimates. Chapter 3 goes further to provide a more accurate parameterization of the anhydrous mantle solidus from experiments over a range of pressures. This chapter concludes that the range of potential temperatures of the mantle beneath mid-ocean ridges and plumes is smaller than currently estimated. Once formed, the oceanic plate moves atop the underlying asthenosphere away from the ridge axis. Chapter 4 uses seafloor magnetotelluric data to investigate the mechanism responsible for plate motion at the lithosphere-asthenosphere boundary. The resulting two dimensional conductivity model shows a simple layered structure. By applying petrological constraints, I conclude that the upper asthenosphere does not contain substantial melt, which suggests that either a thermal or hydration mechanism supports plate motion. Oceanic plate motion has dramatically changed the surface of the Earth over time, and evidence for ancient plate motion is obvious from detailed studies of the longer lived continental lithosphere. In Chapter 5, I investigate past plate motion by inverting magnetotelluric data collected over eastern Zambia. The conductivity model probes the Zambian lithosphere and reveals an ancient subduction zone previously suspected from surface studies. This chapter elucidates the complex lithospheric structure of eastern Zambia and the geometry of the tectonic elements in the region, which collided as a result of past oceanic plate motion. Combined, the chapters of this thesis provide critical constraints on ocean plate dynamics.

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The Mesoproterozoic Irumide belt of Zambia

Cited by 106 publications

References 53 publications

Palaeoproterozoic to Neoproterozoic growth and evolution of the eastern Congo Craton: Its role in the Rodinia puzzle

Palaeoproterozoic to Neoproterozoic growth and evolution of the eastern Congo Craton: Its role in the Rodinia puzzle

U–Pb and Hf-isotope analyses of zircon from the Kundelungu Kimberlites, D.R. Congo: Implications for crustal evolution

Geophysical and petrological constraints on ocean plate dynamics

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