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Journal of Petrology Advance Access published online on November 13, 2006
Journal of Petrology, doi:10.1093/petrology/egl054
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
Received October 27, 2005
Accepted August 30, 2006

Original Papers

Ferric Iron in CaTiO3 Perovskite as an Oxygen Barometer for Kimberlitic Magmas 1: Experimental Calibration

Anthony Bellis 1 and Dante Canil 1 *

1 School of Earth and Ocean Sciences, University of Victoria, 3800 Finnerty Road, Victoria, BC, V8W 3P6, Canada

* To whom correspondence should be addressed.
Dante Canil, E-mail: dcanil{at}uvic.ca


  Abstract

A method to estimate the oxygen fugacity (fO2) during the crystallization of kimberlites is developed using the Fe content of CaTiO3 perovskite (Pv), a common groundmass phase in these rocks. With increasing fO2, more Fe exists in the kimberlitic liquid as Fe3+, and thus partitions into Pv. Experiments to study the partitioning of Fe between Pv and kimberlite liquid were conducted at 100 kPa on simple and complex anhydrous kimberlite bulk compositions from 1130 to 1300°C over a range of fO2 from NNO - 5 to NNO + 4 (where NNO is the nickel-nickel oxide buffer), and at Nb and rare earth element (REE) contents in the starting materials of 0-5 wt % and 1500 ppm, respectively. The partitioning of Fe between Pv and kimberlite liquid is influenced mostly by fO2, although the presence of Nb increases the partition of Fe3+ into perovskite at a given T and fO2. Multiple linear regression (MLR) of all the experimental data produces a relationship that describes the variation of Fe and Nb in Pv with fO2 relative to the NNO buffer:

{Delta}NNO = [0·50(±0·021) x Nb - Fe(±0·031)

                +0·030(±0·001)]/0·004(±0·0002)

(uncertainties at 2{sigma}, and Nb and Fe as cations per three oxygens). Over the range of conditions of our experiments, this relationship shows no temperature (T) dependence, is not affected by the bulk Fe content of the kimberlite starting material and reproduces experimental data to within 1 log fO2 unit.

Keywords: kimberlites; oxygen fugacity; perovskite; ferric iron; magma.
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