Petrology, Origin and Metamorphic History of Proterozoic-aged Granulites of the Natal Metamorphic Province, Southeastern Africa

Mendonidis, P.

doi:10.1016/s1342-937x(05)71011-x

Cited by 14 publications

(29 citation statements)

References 74 publications

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“…They both have S-type chemical characteristics Thomas et al, 1991) and may be interpreted as having originated by fluid absent melting of metasediments (of the Mzimkulu Group?) during the high temperature-low pressure D1 (S1, M1) granulite event recognized by Mendonidis and Grantham (2003). Both these granites contain garnetiferous and charnockitic leucosomes that are concordant to the S2 fabric, and probably originated through syn-M2 fluid-absent anatexis (Saunders, 1995).…”

Section: Metamorphic Fluid Activity Charnockite (Fluid-induced Charnomentioning

confidence: 97%

“…2. Multiple metamorphic events have been reported from each terrane and metamorphic textures suggest that metamorphism coincided with the deformation events (Mendonidis, 1989;Mendonidis et al, 2002;Mendonidis and Grantham, 2003;Bisnath et al, 2008). Metamorphic grade generally increases from greenschist facies in Figure 2 Graphical tabulation of the Natal Metamorphic belt lithologies for which there are published U/Pb zircon emplacement ages, sorted according to the age scale on the left (after .…”

Section: Natal Metamorphic Provincementioning

confidence: 99%

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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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Section: Metamorphic Fluid Activity Charnockite (Fluid-induced Charnomentioning

confidence: 97%

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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“…Exposures inland are poor. The meta-pelitic gneisses comprise equigranular, finely banded, biotite-orthopyroxene-garnet gneiss and medium-grained melanocratic, biotite-orthopyroxene-garnet-cordierite gneiss (Mendonidis and Grantham, 2003). The cordierite-bearing gneiss occurs as 50 cm bands within the more common biotite-orthopyroxene-garnet gneiss.…”

Section: Supracrustal Rocksmentioning

confidence: 99%

“…Mendonidis et al, 2002). The fabric is designated S 2 and is present in the supracrustal gneisses of the Mzimkulu Group, the Glenmore Granite and the Margate Granite Suite (Mendonidis and Grantham, 2003;Mendonidis et al, 2002). The structural geology of the Leisure Bay meta-pelites is described by Talbot and Grantham (1987) and Mendonidis and Strydom (1989), and the metamorphic history is detailed by Mendonidis and Grantham (2003).…”

Section: Structural Geology and Metamorphismmentioning

confidence: 99%

“…M 1 involved hightemperature/low pressure (>850°C, 4kb) metamorphism and dehydration melting to produce garnet + orthopyroxene leucosomes and garnet + cordierite restites and has been related to intrusion of the calc-alkaline Munster Suite (Mendonidis and Grantham, 2003). Inclusions of hercynite in cordierite, together with garnet + quartz symplectites after orthopyroxene + plagioclase, are interpreted to indicate isobaric cooling after the peak of M 1 .…”

Section: Structural Geology and Metamorphismmentioning

confidence: 99%

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