Polymict Peridotites from the Bultfontein and de Beers Mines, Kimberly, South Africa
- F.R. Boyd and
- Henry O.A. Meyer
Published Online: 19 MAR 2013
Copyright © 1979 by the American Geophysical Union.
The Mantle Sample: Inclusion in Kimberlites and Other Volcanics
How to Cite
Lawless, P.J., Gurney, J.J. and Dawson, J.B. (1979) Polymict Peridotites from the Bultfontein and de Beers Mines, Kimberly, South Africa, in The Mantle Sample: Inclusion in Kimberlites and Other Volcanics (eds F.R. Boyd and H. O.A. Meyer), American Geophysical Union, Washington, D.C.. doi: 10.1029/SP016p0145
- Published Online: 19 MAR 2013
- Published Print: 1 JAN 1979
Print ISBN: 9780875902135
Online ISBN: 9781118664858
- Clinopyroxene megacrysts;
- Polymict peridotites;
- Rock clasts;
- Xenocrystic minerals
Four samples of hitherto undescribed xenoliths from the Bultfontein and De Beers kimberlites have been studied. The rocks consist of a wide variety of peridotitic xenoliths, eclogite fragments and megacryst minerals cemented together by ilmenite, phlogopite, rutile and sulphides. The rocks have been called polymict peridotites. They are interpreted as remnant conduit filling left behind in the mantle after the migration of a kimberlitic fluid upwards. Subsequent to consolidation the polymict rocks were sampled by one of the Bultfontein kimberlite intrusions.
A zircon age of 82.8 m.y. is thought to apply to the sampling event.