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Chromite alteration in the Panton Sill, East Kimberley Region, Western Australia

Published online by Cambridge University Press:  05 July 2018

Paul R. Hamlyn
Paul R. Hamlyn*
Affiliation:
Department of Geology, University of Melbourne, Parkville, Victoria, Australia
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Summary

In addition to the normal type of chromite alteration, an antipathetic form of alteration has been observed in the ultramafic zone of the Panton Sill, Western Australia. The chromites display margins of lower reflectivity related to a marked enrichment in MgO and Al2O3 and depletion in Cr2O3, Fe2O3, and FeO, such that a spinellid of composition lying between the end members MgAl2O4 and FeAlaO4 is formed. The alteration is related to the formation of secondary spinel in the ground-mass during the hornblendization of primary silicates under metasomatic conditions accompanied by low oxygen activity.

Type
Research Article
Information
Mineralogical Magazine , Volume 40 , Issue 310 , June 1975 , pp. 181 - 192
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1975

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