GRANITOIDS FROM THE MARGATE TERRANE AND THEIR IMPLICATIONS FOR TECTONO-MAGMATIC MODELS OF THE NATAL METAMORPHIC PROVINCE (SOUTH AFRICA)

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Author list: Voordouw RJ, Rajesh HM

Publisher: Geological Society of South Africa

Place: MARSHALLTOWN

Publication year: 2012

Journal acronym: S AFR J GEOL

Volume number: 115

Issue number: 1

Start page: 47

End page: 64

Number of pages: 18

ISSN: 1012-0750

Languages: English-Great Britain (EN-GB)

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Abstract

Accepted models suggest that the c. 1.21 to 1.02 Ga Margate Terrane is one of three volcanic arc-like terranes that form the Natal Metamorphic Province in South Africa. Integration of new and compiled geological mapping and whole rock geochemical data, however, shows that similar to 83% of bedrock exposure of the Margate Terrane is formed of ferroan to magnesian alkali-calcic granites that are more typical of petrogenesis within thick continental-like crust. Prominent negative Nb and Ti anomalies, as well as relatively low Sr-r, furthermore suggest petrogenesis above a subduction zone and/or derivation from juvenile volcanic arc-related rocks. Exposures of volcanic arc-like lithologies, on the other hand, comprise just similar to 9% of all bedrock in the Margate Terrane and only similar to 2% the granitoids. An alternative interpretation is therefore presented that suggests most of the "Margate Terrane" is in fact a similar to 1.09 to 1.02 Ga granitic batholith.

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