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Prismatine and ferrohögbomite-2N2S in granulite-facies Fe-oxide lenses in the Eastern Ghats Belt at Venugopalapuram, Vizianagaram district, Andhra Pradesh, India: do such lenses have a tourmaline-enriched lateritic precursor?

Published online by Cambridge University Press:  05 July 2018

E. S. Grew ,
A. T. Rao ,
K. K. V. S. Raju ,
C. Hejny ,
J. M. Moore ,
D. J. Waters ,
M. G. Yates  and
C. K. Shearer
E. S. Grew*
Affiliation:
Department of Earth Sciences, University of Maine, 5790 Bryand Center, Orono, Maine 04469, USA
A. T. Rao
Affiliation:
Department of Geology, Andhra University, Visakhapatnam 530 003, India
K. K. V. S. Raju
Affiliation:
Department of Geology, Andhra University, Visakhapatnam 530 003, India
C. Hejny
Affiliation:
School of Physics, University of Edinburgh, The King’s Buildings, Edinburgh EH9 3JZ, UK
J. M. Moore
Affiliation:
Department of Exploration Geology, Rhodes University, P O Box 94, Grahamstown, 6140 South Africa
D. J. Waters
Affiliation:
Department of Earth Sciences, Oxford University, Parks Road, Oxford OX1 3PR, UK
M. G. Yates
Affiliation:
Department of Earth Sciences, University of Maine, 5790 Bryand Center, Orono, Maine 04469, USA
C. K. Shearer
Affiliation:
Institute of Meteoritics, University of New Mexico, Albuquerque, New Mexico 87131, USA
*
* E-mail: esgrew@maine.edu
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Abstract

Fluorine-rich prismatine, (□,Fe,Mg)(Mg,Al,Fe)5Al4(Si,B,Al)5O21(OH,F), with F/(OH+F) = 0.36–0.40 and hercynite are major constituents of a Fe-Al-B-rich lens in ultrahigh-temperature granulite-facies quartz-sillimanite-hypersthene-cordierite gneisses of the Eastern Ghats belt, Andhra Pradesh, India. Hemo-ilmenite, sapphirine, magnetite, biotite and sillimanite are subordinate. Lithium, Be and B are concentrated in prismatine (140 ppm Li, 170 ppm Be, and 2.8 –3.0 wt.% B2O3). Another Fe-rich lens is dominantly magnetite, which encloses fine-grained zincian ferrohögbomite-2N2S, (Fe2+,Mg,Zn,Al)6 (Al,Fe3+,Ti)16O30(OH)2, containing minor Ga2O3 (0.30 –0.92 wt.%). Fe-Al-B-rich lenses with prismatine (or kornerupine) constitute a distinctive type of B-enrichment in granulite-facies rocks and have been reported from four other localities worldwide. A scenario involving a tourmalineenriched lateritic precursor affected by dehydration melting is our preferred explanation for the origin of the Fe-Al-B-rich lenses at the five localities. Whole-rock analyses and field relationships at another of these localities, Bok se Puts, Namaqualand, South Africa, are consistent with this scenario. Under granulite-facies conditions, tourmaline would have broken down to give kornerupine-prismatine (±other borosilicates) plus a sodic melt containing H2O and B. Removal of this melt depleted the rock in Na and B, but the formation of ferromagnesian borosilicate phases in the restite prevented total loss of B.

Keywords

prismatineferrohögbomiteEastern Ghats BeltIndiaNamaqualandSouth Africa.
Type
Research Article
Information
Mineralogical Magazine , Volume 67 , Issue 5 , October 2003 , pp. 1081 - 1098
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2003

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