The nature of the Grenville-age charnockitic A-type magmatism from the Natal, Namaqua and Maud Belts of southern Africa and western Dronning Maud Land, Antarctica

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概要

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• The ∿1030-1090Ma old, locally charnockitic, intrusions which are exposed from Namaqualand in the west, through Natal, into the Maud Province Antarctica in the east, show A-type, within plate granite characteristics. The major and trace element characteristics from all the intrusions are remarkably similar and consistent and are typical of C-Type charnockites. Two-pyroxene thermometry as well as thermometry utilising calibrations from experimental studies of saturation surfaces using Zr, P and Ti suggest temperatures between ∿850℃ and ∿1100℃. Pressure estimates from aureole assemblages suggest depths of emplacement between 30-10km. Available isotopic data suggest magma sources in Natal and Antarctica were juvenile, probably mantle derived whereas those in Namaqualand suggest a significant crustal contribution.

• 国立極地研究所の論文

著者

• Eglington B.m.

  Council For Geoscience

• Grantham G.h.

  Council For Geoscience

• Thomas R.J.

  Council for Geoscience

• Mendonidis P.

  Department of Metallurgy, Vaal Triangle Technikon

• Mendonidis P.

  Department Of Metallurgy Vaal Triangle Technikon

関連論文

• Petrography and mineral chemistry of high-grade pelitic gneisses and related rocks from Namaqualand, South Africa
• New evidence for prograde metamorphism and partial melting of Mg-Al-rich granulites from western Namaqualand, South Africa
• The nature of the Grenville-age charnockitic A-type magmatism from the Natal, Namaqua and Maud Belts of southern Africa and western Dronning Maud Land, Antarctica

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