Graphite in natural and experimental carbonate systems
Published online by Cambridge University Press: 14 March 2018
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
- Information
- Mineralogical magazine and journal of the Mineralogical Society , Volume 35 , Issue 275 , September 1966 , pp. 963 - 970
- Copyright
- Copyright © The Mineralogical Society of Great Britain and Ireland 1966
References
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