Kimberlites, Diatremes, and Diamonds: Their Geology, by Henry O. A. Meyer, F. R. Boyd

By Henry O. A. Meyer, F. R. Boyd

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Published via the yankee Geophysical Union as a part of the Special courses Series.

because the first variation was once released in 1979, the 3rd overseas Kimberlite convention used to be held in Clermont-Ferrand in 1982. however, numerous of the issues addressed by means of papers within the first variation of this book are nonetheless legitimate and stay unanswered at the present time. for instance, we nonetheless don't realize the spatial and temporal dating among kimberiite, xenocrysts and xenoliths, nor will we comprehend why kimberlites happen the place they do or why they generally intruded historic cratonic components periodically all through geologic time. there's a transforming into suspicion that continental rifting or even doleritic/basaltic volcanism is a precursor to kimberlitic task, however the hyperlinks are tenuous and sometimes conflicting.

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These different environments, however, do not appear to seriously influence the growth mechanism of the diamond. At Finsch, Koffiefontein and Premier, it is clear that the octahedra and its twin the macle are the predominant primary diamond crystal habits, irrespective of the silicate assemblage present during their formation. With the cubes at Zwartruggens, and the few cubo-octahedra Copyright American Geophysical Union classified at Premier and Eben- Special Publications Kimberlites, Diatremes, and Diamonds: Their Geology, Petrology, and Geochemistry haezer, it is likely that their morphologies are related to variations in the physical conditions during diamond formation.

Y. for the four Vol. y. determined by Davis et al. (1976). •s the kimberlites at Finsch•-•-•fiefontein andLetsengare also part of the post-Karoo kimberlite event in southern Africa, it would therefore appear that there is no relationship between the principal morpholo- gies of diamondsand the eraplacementages of the kimberlites in which they are found. Of the nine occurrences Zwartruggens is the only kimberlite very distinctive phologies, dyke swarm, and this diamond morpholgies. however, of These mor- can not be related mode of kimberlite study mine contains intrusion, the diamonds from the to the as a preliminary Bellsbank kimber- lite dyke swarm in the Cape Province reveals morphologies and colours similar in type and proportion to the major kimberlite sources discussed above.

Contr. , Sobolev, Mineral. , 58, 203-220, The deep seated kimberlites 1976. inclusions in er and the problem of the upp_ mantle composition. Nauk Publish. , 1974. V. S. Yefimova• Yu. G. N. Pospelova, Association of olivine, garnet and chrome-diopside in a Yakutsk diamond. Dokl. Akad. Nauk SSSR•. , 1349-1353, 1970. I. N. S. 165, Contr. 164-167, Dokl. Chrome pyropes C•rome-rict• in 1972. 26 Copyright American Geophysical Union Nauk. i •. Pokl•lenko, garnets from the parageneses. 40• 39-52, ]97'•.

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