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Deerite from Papua New Guinea

Published online by Cambridge University Press:  05 July 2018

M. A. Worthing
M. A. Worthing*
Affiliation:
Department of Geology, U.P.N.G., Box 320 University P.O., Port Moresby, Papua New Guinea
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Abstract

Deerite in two meta-ironstones from Papua New Guinea coexists with quartz-albite-riebeckite-dannemorite-magnetite-spessartine-stilpnomelane-apatite-Ca/Mn carbonates and quartz-albite-crossite-ilmenite-spessartine-stilpnomelane-apatite respectively. Geochemical comparisons in the system FeO-MnO-MgO suggest that the P.N.G. deerites most closely resemble Franciscan types. However, the metamorphic assemblages more closely resemble Alpine types indicating metamorphism close to the lower P-T limit of deerite stability. Consistent differences in whole-rock and internal oxidation ratios between the two specimens suggest that fo2 may be important in determining deerite chemistry. A redox equation is suggested linking changes in deerite internal oxidation ratio with variable OH content.

Keywords

deeritePapua New Guineaoxygen fugacity
Type
Mineralogy
Information
Mineralogical Magazine , Volume 51 , Issue 363 , December 1987 , pp. 689 - 693
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1987

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Footnotes

*

Present address: Department of Earth Sciences, The University of Leeds, Leeds, LS2 9JT, U.K.

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