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Crystal-chemistry of zirconolite and calzirtite from Jacupiranga, São Paulo (Brazil)

Published online by Cambridge University Press:  05 July 2018

F. Bellatreccia ,
G. Della Ventura ,
E. Caprilli ,
C. T. Williams  and
G. C. Parodi
F. Bellatreccia
Affiliation:
Dipartimento di Scienze Geologiche, Universitá di Roma Tre, Largo S. Leonardo Murialdo 1, 00146 Roma, Italy
G. Della Ventura
Affiliation:
Dipartimento di Scienze Geologiche, Universitá di Roma Tre, Largo S. Leonardo Murialdo 1, 00146 Roma, Italy
E. Caprilli
Affiliation:
Dipartimento di Scienze Geologiche, Universitá di Roma Tre, Largo S. Leonardo Murialdo 1, 00146 Roma, Italy
C. T. Williams
Affiliation:
Department of Mineralogy, The Natural History Museum, Cromwell Road, London SW7 5BD, UK
G. C. Parodi
Affiliation:
Museum National d'Histoire Naturelle, 61, rue Buffon, 75005 Paris, France
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Abstract

A specimen of zirconolite, collected from the type locality of the mineral originally described as zirkelite at Jacupiranga, São Paulo, Brazil has been re-examined and its mineral chemistry more completely characterized. All crystals studied are metamict and display very fine lamellar oscillatory zoning (1–3 µm in width) superimposed on a sector zonation. Such zoning, observed in backscattered electron images, is primarily related to differences in the concentration of Th.

In comparison with other reported zirconolite samples from a variety of geological occurrences, Jacupiranga zirconolite has higher Ca, Th, (Nb + Ta) and lower Ti and REE, which is consistent with its occurrence in carbonatitic rocks. The compositional variation with respect to an ideal zirconolite is described by two main coupled substitutions:

Calzirtite, Ca2Zr5Ti2O16, although intergrown with zirconolite and with identical major components, shows much less compositional variability with only minor amounts of Nb and Ta substituting for Ti. Unlike zirconolite, the REE and actinide elements are not easily accommodated in the calzirtite structure.

Keywords

JacupirangaBrazilzirconolitecalzirtitemineral chemistrycompositional zoning
Type
Research Article
Information
Mineralogical Magazine , Volume 63 , Issue 5 , October 1999 , pp. 649 - 660
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1999

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