Possible Precambrian Obduction and Plate Tectonics in Southeastern Africa

Matthews, P.E.

doi:10.1038/physci240037a0

Cited by 42 publications

(29 citation statements)

References 4 publications

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“…In Dronning Maud Land, Mesoproterozoic subduction was probably directed underneath a craton to the south. Possible remnants of the closing ocean are recorded as the Tugela ophiolite in Natal (Matthews 1972).…”

Section: Discussionmentioning

confidence: 99%

New age constraints for Grenville-age metamorphism in western central Dronning Maud Land (East Antarctica), and implications for the palaeogeography of Kalahari in Rodinia

Jacobs

Bauer

Fanning

2003

International Journal of Earth Sciences

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Section: Discussionmentioning

confidence: 99%

New age constraints for Grenville-age metamorphism in western central Dronning Maud Land (East Antarctica), and implications for the palaeogeography of Kalahari in Rodinia

Jacobs

Bauer

Fanning

2003

International Journal of Earth Sciences

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“…The northernmost Tugela Terrane comprises plutonic, volcanic and sedimentary rocks that were obducted onto the southern margin of the Kaapvaal Craton, which they now overlie (Matthews, 1972;Barkhuizen and Matthews, 1990;Johnston et al, 2003). The southern margin of the Tugela Terrane is marked by the Lilani-Matigulu shear zone (Thomas, 1989).…”

Section: Natal Metamorphic Provincementioning

confidence: 98%

“…The shaded blocks indicate lithologies that contain charnockitic rocks. the north to granulite facies in the south (Matthews, 1972;Thomas et al, 1994;McCourt et al, 2006).…”

Section: Natal Metamorphic Provincementioning

confidence: 99%

Multiple origins of charnockite in the Mesoproterozoic Natal belt, Kwazulu-Natal, South Africa

Grantham

Mendonidis

Thomas

et al. 2012

Geoscience Frontiers

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Four different varieties of charnockitic rocks, with different modes of formation, from the Mesoproterozoic Natal belt are described and new C isotope data presented. Excellent coastal exposures in a number of quarries and river sections make this part of the Natal belt a good location for observing charnockitic field relationships. Whereas there has been much debate on genesis of charnockites and the use of the term charnockite, it is generally recognized that the stabilization of orthopyroxene relative to biotite in granitoid rocks is a function of low aH 2 O (AE high CO 2 ), high temperature, and composition (especially Fe/(Fe þMg)). From the Natal belt exposures, it is evident that syn-emplacement, magmatic crystallization of charnockite can arise from mantle-derived differentiated melts that are inherently hot and dry (as in the Oribi Gorge granites and Munster enderbite), as well as from wet granitic melts that have been affected through interaction with dry country rock to produce localized charnockitic marginal facies in plutons (as in the Portobello Granite). Two varieties of post-emplacement sub-solidus charnockites are also evident. These include charnockitic aureoles developed in leucocratic, biotite, garnet granite adjacent to cross-cutting enderbitic veins that are attributed to metamorphic-metasomatic processes (as in the Nicholson's Point granite, a part of the Margate Granite Suite), as well as nebulous, patchy charnockitic veins in the Margate Granite that are attributed to anatectic metamorphic processes under low-aH 2 O fluid conditions during a metamorphic event. These varieties of charnockite show that the required

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“…The Tugela Terrane comprises a series of NE directed, flat-lying thrust nappes, 82 predominantly composed of supracrustal sequences; mainly layered amphibolites with 83 subordinate quartzofeldspathic gneisses and ultramafic rocks with some intrusive 84 tonalitic orthogneisses (Matthews, 1972 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 1 2 3 4 5 6 7 8 9 10 11 1...…”

Section: Regional Setting 81mentioning

confidence: 99%

Crustal growth during island arc accretion and transcurrent deformation, Natal Metamorphic Province, South Africa: New isotopic constraints

Spencer

Thomas

Cawood

et al. 2015

Precambrian Research

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15The Natal Metamorphic Province consists of, from north to south, the Tugela, Mzumbe, 16 and Margate terranes. These were accreted to the southeastern margin of the Kaapvaal 17Craton in the late Mesoproterozoic, and followed by intrusion of a large suite of A-type 18 granitoid bodies. New U-Pb data from zircon, titanite, and monazite further constrains the 19 temporal framework of these geological events. 20

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Possible Precambrian Obduction and Plate Tectonics in Southeastern Africa

Cited by 42 publications

References 4 publications

New age constraints for Grenville-age metamorphism in western central Dronning Maud Land (East Antarctica), and implications for the palaeogeography of Kalahari in Rodinia

New age constraints for Grenville-age metamorphism in western central Dronning Maud Land (East Antarctica), and implications for the palaeogeography of Kalahari in Rodinia

Multiple origins of charnockite in the Mesoproterozoic Natal belt, Kwazulu-Natal, South Africa

Crustal growth during island arc accretion and transcurrent deformation, Natal Metamorphic Province, South Africa: New isotopic constraints

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