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Journal of Petrology Advance Access published online on January 13, 2006
Journal of Petrology, doi:10.1093/petrology/egi098
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org
Received September 27, 2004
Accepted December 14, 2005

Article

Beryllium and Other Trace Elements in Paragneisses and Anatectic Veins of the Ultrahigh-Temperature Napier Complex, Enderby Land, East Antarctica: the Role of Sapphirine

EDWARD S. GREW 1 *, MARTIN G. YATES 1, CHARLES K. SHEARER 2, JUSTIN J. HAGERTY 2, JOHN W. SHERATON 3, and MICHAEL SANDIFORD 4

1 DEPARTMENT OF EARTH SCIENCES, UNIVERSITY OF MAINE, 5790 EDWARD T. BRYAND RESEARCH CENTER, ORONO, ME 04469-5790, USA
2 INSTITUTE OF METEORITICS, UNIVERSITY OF NEW MEXICO, ALBUQUERQUE, NM 87131, USA
3 STONEACRE, BREAM ROAD, ST. BRIAVELS, LYDNEY GL15 6TL UK
4 SCHOOL OF EARTH SCIENCES, UNIVERSITY OF MELBOURNE, CARLTON, VIC. 3010, AUSTRALIA

* To whom correspondence should be addressed.
EDWARD S. GREW, E-mail: esgrew{at}maine.edu


  Abstract

Anatectic veins containing the Be minerals khmaralite and beryllian sapphirine as primary phases (or surinamite derived therefrom) are associated with Mg-Al-rich paragneisses at three localities in the ultrahigh-temperature Napier complex, Antarctica, a unique Be mineralization in the granulite facies. Likely precursors of the paragneisses are volcaniclastic deposits that were hydrothermally altered by heated seawater prior to metamorphism. Regular distribution of Be among minerals in the paragneisses suggests an approach to equilibrium with Be greatly concentrated in sapphirine (25-3430 ppm Be) or cordierite (560-930 ppm Be) relative to plagioclase An53-66 (14-43 ppm Be) > cores of coarse-grained orthopyroxene (0·7-29 ppm Be) > coronitic orthopyroxene (0·4-14 ppm Be) {approx} sillimanite (0·1-26 ppm Be) {approx} plagioclase An18-33 (0·6-15 ppm Be) > biotite (0·06-8 ppm Be) > K-feldspar, quartz, garnet (0·05-0·7 ppm Be). Sapphirine-bearing paragneisses have average Be concentrations, 4·9 ± 2·4 ppm (13 samples), about twice that of typical pelites, whereas paragneisses lacking sapphirine and primary cordierite have only 2·9 ± 2·1 ppm Be (12 samples), implying some loss of Be during metamorphism. The likely source rocks for the Be-rich melts were biotitic rocks lacking the Be sinks sapphirine and cordierite. These gneisses were probably less competent than the sapphirine-bearing gneisses, so the melts were drawn to the latter and collected in spaces opened during deformation and boudinage of the more competent paragneisses. Fractionation of the melts concentrated Be to the extent that Be minerals could crystallize. The final result was Be-mineralized anatectic veins hosted by relatively Be-rich sapphirine-bearing paragneisses.

Keywords: Antarctica; beryllium; granulite facies; microprobe; sapphirine.
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