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A secondary ion mass spectrometry (SIMS) re-evaluation of B and Li isotopic compositions of Cu-bearing elbaite from three global localities

Published online by Cambridge University Press:  05 July 2018

T. Ludwig ,
H. R. Marschall ,
P. A. E. Pogge von Strandmann ,
B. M. Shabaga ,
M. Fayek  and
F. C. Hawthorne
T. Ludwig*
Affiliation:
Institute of Earth Sciences, Heidelberg University, Im Neuenheimer Feld 234–36, 69120 Heidelberg, Germany
H. R. Marschall
Affiliation:
Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queens Road, Bristol BS8 1RJ, UK Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA
P. A. E. Pogge von Strandmann
Affiliation:
Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queens Road, Bristol BS8 1RJ, UK
B. M. Shabaga
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
M. Fayek
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
F. C. Hawthorne
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
*
*E-mail: thomas.ludwig@geow.uni-heidelberg.de
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Abstract

Cu-bearing elbaite from Paraíba (Brazil) is a highly-prized gem tourmaline. Specimens of similar quality from localities in Mozambique and Nigeria are being sold, and reliable provenance tools are required to distinguish specimens from the original locality from ‘Paraíba-type’ tourmaline from Africa. Here we present Li and B isotope analyses of Cu-bearing elbaite from all three localities and demonstrate the suitability of these isotope systems as a provenance tool. Isotopic profiles across chemically zoned grains revealed homogenous B and Li isotopic compositions, demonstrating a strong advantage of their application as a provenance tool as opposed to major, minor or trace element signatures.

Li and B isotopes of all investigated samples of Cu-bearing elbaites from the three localities are within the range of previously published granitic and pegmatitic tourmaline. Anomalous isotope compositions published previously for these samples are corrected by our results.

Keywords

tourmalineisotopesParaíbalithiumboronsecondary ion mass spectrometry (SIMS)ion probeLA-ICP-MS
Type
Research Article
Information
Mineralogical Magazine , Volume 75 , Issue 4 , August 2011 , pp. 2485 - 2494
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2011

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