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Stable coexistence of grandidierite and kornerupine during medium pressure granulite facies metamorphism

Published online by Cambridge University Press:  05 July 2018

C. J. Carson ,
M. Hand  and
P. H. G. M. Dirks
C. J. Carson
Affiliation:
School of Earth Sciences, University of Melbourne, Parkville, Victoria, 3052, Australia
M. Hand
Affiliation:
School of Earth Sciences, University of Melbourne, Parkville, Victoria, 3052, Australia
P. H. G. M. Dirks
Affiliation:
Department of Earth Sciences, University of Utrecht, P.O. Box 80.021, 3508TA, Utrecht, The Netherlands
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Abstract

Petrological and mineral chemical data are presented for two new occurrences of co-existing borosilicate minerals in the Larsemann Hills, East Antarctica. The assemblages contain kornerupine and the rare borosilicate, grandidierite (Mg,Fe)A13BSiO9. Two distinct associations occur: (1) At McCarthy Point, 1–10 mm thick tourmaline-kornerupine-grandidierite layers are hosted within quartzofeldspathic gneiss; and (2) Seal Cove, where coexisting kornerupine and grandidierite occur within coarse-grained, metamorphic segregations with Mg-rich cores of cordierite-garnet-spinel-biotite-ilmenite and variably developed plagioclase halos. The segregations are hosted within biotite-bearing, plagio-feldspathic gneiss. Textural relationships from these localities indicate the stability of co-existing kornerupine and grandidierite.

The grandidierite- and kornerupine-bearing segregations from Seal Cove largely postdate structures developed during a crustal thickening event (D2) which was coeval with peak metamorphism. At McCarthy Point, grandidierite, kornerupine and late-tourmaline growth predates, or is synchronous, with F3 fold structures developed during a extensive granulite grade, normal shearing event (D3) which occurred prior to, and synchronous with, near-isothermal decompression. Average pressure calculations on assemblages that coexist with the borosilicates at Seal Cove, indicate the prevailing conditions were 5.2–5.5 kbar at ∼ 750°C for formation of the grandidierite-kornerupine assemblage.

Keywords

grandidieritekornerupinedecompressioncoexisting borosilicatesLarsemann HillsEast Antarctica
Type
Mineralogy
Information
Mineralogical Magazine , Volume 59 , Issue 395 , June 1995 , pp. 327 - 339
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1995

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