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The origin of kimberlite

Wyllie, Peter J. (1980) The origin of kimberlite. Journal of Geophysical Research B, 85 (B12). pp. 6902-6910. ISSN 0148-0227. doi:10.1029/JB085iB12p06902.

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A new diapiric model for kimberlite genesis takes into account recent interpretations of peridotite-CO_2-H_2O melting relationships. A minor thermal perturbation at depth might trigger release of reduced vapors with major components C-H-O. Where these volatile components cross the estimated solidus boundary near 260 km, partial melting occurs, the density inversion causes diapiric uprise along adiabats, and the partially melted diapirs begin to crystallize at 100 to 80-km depth, where they reach a temperature maximum (thermal barrier) on the solidus. The released vapor enhances the prospects for crack propagation through overlying lithosphere in tension, and this could produce an initial channel to the surface. Magma separation could then occur from progressively greater depths, releasing CO_2-under-saturated kimberlitic magma for independent uprise through the established conduit, quite unaffected by the thermal barrier on the solidus of peridotite-CO_2-H_2O. Cooler diapirs would cross the solidus at somewhat greater depth, solidifying to phlogopite-dolomite-peridotite with the release of aqueous solutions. These solutions are likely candidates for the mantle metasomatism commonly considered to be a precursor for the generation of kimberlites and other alkalic magmas. According to this model the metasomatism is a consequence of kimberlite magmatism rather than its precursory cause.

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Additional Information:Copyright 1980 by the American Geophysical Union. (Received March 5, 1980; revised March 27, 1980; accepted April 1, 1980.) This research was supported by the Earth Sciences Section, National Science Foundation, grant EAR 76-20410. I also thank Barry Hawthorne for an invitation to Kimberlite Symposium II, where many aspects of this paper first gelled.
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NSFEAR 76-20410
Issue or Number:B12
Record Number:CaltechAUTHORS:20141105-145624253
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Official Citation:Wyllie, P. J. (1980), The origin of kimberlite, J. Geophys. Res., 85(B12), 6902–6910, doi:10.1029/JB085iB12p06902.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51333
Deposited By: George Porter
Deposited On:05 Nov 2014 23:27
Last Modified:10 Nov 2021 19:09

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