@article{oai:nipr.repo.nii.ac.jp:00002414, author = {Grantham,G.H. and Eglington,B.M. and Thomas, R.J. and Mendonidis, P.}, journal = {Memoirs of National Institute of Polar Research. Special issue}, month = {Jul}, note = {P(論文), 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.}, pages = {59--86}, title = {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}, volume = {55}, year = {2001} }