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Graphite in natural and experimental carbonate systems

Published online by Cambridge University Press:  14 March 2018

D. C. Gellatly*
Affiliation:
Research Institute of African Geology, Department of Geology, University of Leeds1

Summary

Graphite occurs in the Darkainle nepheline syenite complex, Somali Republic, as small drop-like grains in an altered ankeritic carbonatite; it has been recorded previously from carbonate-bearing nepheline syenites and kimberlites. Experimental evidence indicates that siderite decomposes to a stable association of magnetite and graphite within the PT ranges 500 to 10 000 bars and 455 to 745° C. The graphite in carbonatite and other alkaline igneous rocks may have been formed similarly by the decomposition of siderite or iron-rich carbonates.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1966

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