Titlebook: Kimberlites and Their Xenoliths; J. Barry Dawson Book 1980 Springer-Verlag Berlin • Heidelberg 1980 Kimberlit.Xenolith.carbonatite.chemist

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Kimberlites and Their Xenoliths978-3-642-67742-7Series ISSN 0343-2181

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Geology of Kimberlite Intrusions,Kimberlite occurs in diatremes (pipes), dykes and sills of very limited size, and one example of a kimberlite ring dyke is known in Sierra Leone. (The words diatreme and pipe will be used synonymously.)

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Xenoliths in Kimberlite,Within kimberlite intrusions there are included fragments of a wide variety of rock types. Minerals derived from their fragmentation are incorporated into the host kimberlite, thereby giving it an extremely complex and hybrid mineralogy.

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Introduction,s have received considerable attention from experimental petrologists in connection with the origin of basaltic magmas. The third principal reason for studying kimberlite is its chemistry. It contains high concentrations of lithophile elements in a rock that is essentially ultrabasic, and it also co

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Petrography of Kimberlite,ine), picro-ilmenite, mica, pyroxene and garnet; these are set in a matrix of serpentine-group minerals and carbonate, containing microphenocrysts of mica, spinel, perovskite and rare diopside and monticellite in varying proportions; the matrix may vary from light yellow to dark green or black, depe

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The Megacryst Suite,nally similar than the high-Cr, low-Ca pyropes found as diamond inclusions, and occurring as small isolated crystals in the kimberlite of the Finsch Mine (Gurney and Switzer 1973). The garnet contains small altered crystals of ?olivine or ?orthopyroxene.

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0343-2181 s has Sobolev. Second, the literature is vast and I have tried to pull together for the reader the wide range of views and infor­ mation presented both in the r978-3-642-67744-1978-3-642-67742-7Series ISSN 0343-2181

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Book 1980 getting something worth reading. After all, intense research into the upper mantle over the past two decades has already resulted in a number of volumes on kim­ berlites and their xenoliths. So why yet another one? First, in this book I have concentrated on kimberlite as an individual rock-type and