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Primary baddeleyite (Zr02) in kimberlite from Benfontein, South Africa

Published online by Cambridge University Press:  05 July 2018

D. E. Scatena-Wachel  and
A. P. Jones
D. E. Scatena-Wachel
Affiliation:
Department of Chemistry, The University of Chicago, Chicago, Illinois 60637, USA
A. P. Jones
Affiliation:
Department of the Geophysical Sciences, The University of Chicago, Chicago, Illinois 60637, USA
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Abstract

Baddeleyite was found during an electron microprobe study of kimberlite from the Benfontein Sills, which are famous for their igneous carbonate and cumulus features. Based on its close textural association with both groundmass and cumulus oxides (spinels, ilmenite, perovskite), the baddeleyite appears to be primary and crystallized directly from the kimberlite magma. The baddeleyite is remarkably pure, with average ZrO2 and HfO2 of 96.4±1.3 and 1.72±0.08 wt. % respectively. Minor element ranges found were: TiO2 0.32–0.80, CaO 0.31–0.80, FeO 0.43–1.31, MgO 0.06–0.24, SiO2 0.04–0.19, Cr2O3 0–0.07, and Al2O3 0–0.10 wt.%. Several additional trace elements were sought (Ce, Cs, Mn, Nb, Nd, Sr, Y, Yb, and U) but were not detected.

Type
Research Article
Information
Mineralogical Magazine , Volume 48 , Issue 347 , June 1984 , pp. 257 - 261
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1984

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