Proterozoic Transpressive Deformation in the Northern Marginal Zone, Limpopo Belt, Zimbabwe

Kamber, Balz S.; Blenkinsop, Tom; Villa, Igor M.; Dahl, Peter S.

doi:10.1086/629772

Cited by 81 publications

(31 citation statements)

References 31 publications

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“…Subsequent geotherm modelling, incorporating minimum basal heat flux and crustal thickening parameters implies the NMZ had a large internal capacity for generating heat; a feature Kramers et al (2001) relate to repeated high-grade metamorphic events associated with prolonged magmatic activity. An additional tectono-metamorphic event, with peak conditions estimated at 600-650 °C/6.5 kbar, is reported for the southern half the NMZ by (Kamber et al, 1995a) and (Kamber et al, 1995b). The timing of this event is constrained by Ar-Ar dating of metamorphic hornblende from amphibolites to be ca.…”

Section: Fig 4 a Synopsis Of The P-t Conditions From The Nmz Stripmentioning

confidence: 93%

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A review of the pressure–temperature–time evolution of the Limpopo Belt: Constraints for a tectonic model

Rigby

Mouri

Brandl

2008

Journal of African Earth Sciences

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Published literature argues that the Limpopo Belt can be subdivided into three zones, each with a distinctive geological character and tectono-metamorphic fingerprint. There are currently two contrasting schools of thought regarding the tectono-metamorphic evolution of the CZ. One camp argues that geochronological, structural and prograde pressure-temperature (P-T) evidence collectively indicate that the CZ underwent tectono-metamorphism at ca. 2.0 Ga which followed a clockwise P-T evolution during a transpressive orogeny that was initiated by the collision of the Kaapvaal and Zimbabwe cratons. Deformation and metamorphism consistent with this scenario are observed in the southern part of the NMZ but are curiously absent from the whole of the SMZ. The opposing view argues that the peak metamorphism associated with the collision of the Kaapvaal and Zimbabwe cratons occurred at ca. 2.6 Ga and the later metamorphic event is an overprint associated with reactivation along Archean shear zones. Post-peakmetamorphic conditions, which at present cannot be convincingly related to either a ca. 2.6 or 2.0 Ga event in the CZ reveal contrasting retrograde paths implying either nearisothermal decompression and isobaric cooling associated with a 'pop-up' style of exhumation or steady decompression-cooling linked to exhumation controlled by erosion. Recent data argue that the prograde evolution of the ca. 2.0 Ga event is characterised by isobaric heating prior to decompression-cooling. Contrasting P-T paths indicate that either different units exist within the CZ that underwent different P-T evolutions or that some P-T work is erroneous due to the application of equilibrium thermobarometry to mineral assemblages that are not in equilibrium. The morphology of the P-T path(s) for the ca. 2.6-2.52 Ga event are also a matter of dispute. Some workers have postulated an anticlockwise P-T evolution during this period whilst others regard this metamorphic event as following a clockwise evolution. Granitoid magmatism is broadly contemporaneous in all three zones at ca. 2.7-2.5 suggesting a possible causal geodynamic link. P-T contrasts between and within the respective zones prevent, at present, the construction of a coherent and inter-related tectonic model that can account for all of the available evidence. Detailed and fully-integrated petrological and geochronological studies are required to produce reliable P-T-t paths that may resolve some of these pertinent issues.

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Section: Fig 4 a Synopsis Of The P-t Conditions From The Nmz Stripmentioning

confidence: 93%

“…[Brandl, 1983], and [Holzer et al, 1998]) that is separated from the NMZ and SMZ by two major ENE-WSW trending, inward-dipping, strike-slip shear zones, the Palala-Sunnyside (PSZ) and Magagohate-Triangle (MSZ) (e.g. , [Kamber et al, 1995a] and [Kamber et al, 1995b]). Boshoff et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

A review of the pressure–temperature–time evolution of the Limpopo Belt: Constraints for a tectonic model

Rigby

Mouri

Brandl

2008

Journal of African Earth Sciences

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“…Traditionally there have been two contrasting schools of thought regarding the tectono-metamorphic evolution of the Central Zone (CZ) and the entire Limpopo Belt (e.g., Rigby et al, 2008a). One camp has argued that the data collectively indicate that the CZ underwent deformation and metamorphism at c. 2.0 Ga (Kamber et al, 1995;Holzer et al, 1996Holzer et al, , 1998Kröner et al, 1999;Schaller et al, 1999;Zeh et al, 2004Zeh et al, , 2005Rigby et al, 2008b). Conversely, Van Reenen et al (1987), McCourt and Vearncombe (1992), Roering et al (1992), McCourt and Armstrong (1998), Bumby et al (2001) and Bumby and Van der Merwe (2004) have advocated that the CZ and the entire Limpopo Belt formed during a single, Neoarchaean, high-grade event that was initiated by the collision of the Kaapvaal and Zimbabwe cratons.…”

Section: Commentarymentioning

confidence: 99%

Events in the Precambrian history of the Earth: Challenges in discriminating their global significance

Eriksson

Catuneanu

Nelson³

et al. 2012

Marine and Petroleum Geology

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This paper discusses geological events with an approximately global preservational scale which can aid inter-cratonic correlations and contribute to postulates of supercontinents for a set of chosen Precambrian cratons. The chronological scale of such events is highly variable, and most event types detailed (supercontinent-, mantle plume-, orogenic-, chemostratigraphic-, glacial events and major unconformities) have durations concomitant with the large scale interaction of mantle thermal and plate tectonic processes that were largely responsible for their genesis, i.e. 10's to 100's of millions of years. Geologically instantaneous events of global compass (e.g., impact or major eruptive events) provide important chronological markers for interpreting the longer term events. The same interplay of tectono-thermal geodynamic processes that drives the evolution of the Earth and the operation of its supercontinent cycles is also, ultimately, responsible for and of comparable duration to first-and second-order sequence stratigraphic cyclicity. This paper thus serves to introduce these concepts and discuss the problems in their application to specific Precambrian cratons, in relation to the aim of this special issue, of providing a set of accommodation curves for many of these ancient crustal terranes.

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“…Because the Ar closure temperature for amphibole (c. 600°C, Kamber et al 1995) is higher than that of biotite, the older biotite age of the country rock confirms that the lamprophyre kaersutite age of c. 69 Ma represents the lamprophyre dike intrusion age and that it has not been reset by metamorphism.…”

Section: Intrusion Of Dikes In the Bonar Rangementioning

confidence: 73%

Magmatism during Gondwana break-up: new geochronological data from Westland, New Zealand

Meer

Scott

Waight

et al. 2013

New Zealand Journal of Geology and Geophysics

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Newly determined Late Cretaceous 40 Ar/ 39 Ar ages on megacrystic kaersutite from four lamprophyre dikes, and a U-Pb zircon age on a trachyte, from central and north Westland (New Zealand) are presented. These ages suggest that the intrusion of mafic dikes (88-86 and 69 Ma) was not necessarily restricted to the previously established narrow age range of 80-92 Ma. The younger lamprophyre and trachyte dikes (c. 68-70 Ma) imply that tensional stresses in the Western Province were either renewed at this time, or that extension and related magmatism continued during opening of the Tasman Sea. Extension-related magmatism in the region not only preceded Tasman seafloor spreading initiation (starting at c. 83 Ma, lasting to c. 53 Ma), but may have sporadically continued for up to 15 Ma after continental break-up.

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Proterozoic Transpressive Deformation in the Northern Marginal Zone, Limpopo Belt, Zimbabwe

Cited by 81 publications

References 31 publications

A review of the pressure–temperature–time evolution of the Limpopo Belt: Constraints for a tectonic model

A review of the pressure–temperature–time evolution of the Limpopo Belt: Constraints for a tectonic model

Events in the Precambrian history of the Earth: Challenges in discriminating their global significance

Magmatism during Gondwana break-up: new geochronological data from Westland, New Zealand

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