Journal ArticleDOI
Kimberlite and Related Rocks: A Critical Reappraisal
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TLDR
In this article, a discussion of the most important petrographic features of kimberlite is presented and a new definition of KIMBERLITE is proposed, emphasizing those features of Kimberlites which are of petrogenetic significance and points out that alnoitic and lamprophyric rocks associated with alkaline rock-carbonatite complexes are not true kimblites.Citations
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Journal ArticleDOI
Magmatic sedimentation and carbonatitic differentiation in kimberlite sills at Benfontein, South Africa
TL;DR: In this paper, three sills of kimberlite intrude Dwyka shales and overlying Karroo dolerite, showing strong affinities with carbonatite.
Book ChapterDOI
Rare Earth Elements in Igneous Rocks of the Continental Crust: Predominantly Basic and Ultrabasic Rocks
Robert L. Cullers,Joseph L. Graf +1 more
Journal ArticleDOI
Advances in kimberlite geology
TL;DR: Kimberlite is a hybrid rock, formed by incorporation of crystals mainly derived from fragmentation of upper mantle garnet lherzolite into a matrix that has strong affinities with carbonatite as discussed by the authors.
Journal ArticleDOI
Olivine, and the Origin of Kimberlite
Nicholas Arndt,Martin Guitreau,Anne Marie Boullier,A. P. Le Roex,Andréa Tommasi,Patrick Cordier,Alexander V. Sobolev +6 more
TL;DR: In this article, it was shown that pyroxene and an aluminous phase were removed from the mantle peridotite that was to become the source of the nodules, and the Fo content of the retained olivine was modified during interaction with CO2-rich fluids whose arrival at the base of the lithosphere immediately preceded the passage of the kimberlite magmas.
Journal ArticleDOI
Nature and origin of calc-alkaline lamprophyres: minettes, vogesites, kersantites and spessartites
TL;DR: Calc-alkaline lamprophyres are porphyritic dyke-rocks, richer in amphibole, biotite, ultramark elements (Mg, Cr, Ni) and incompatible elements (K, F, P, Rb, Sr, Zn, Nb, Ba, REE, Th, U) than other rocks of comparable colour index (35-67) or % SiO2 (46-57) as discussed by the authors.
References
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Book
An Introduction to the Rock-Forming Minerals
TL;DR: In this article, the authors define di-and ring silicates: olivine group humite group zircon sphene (titanite) garnet group, vesuvianite sillimanite, mullite, andalusite, kyanite topaz staurolite, chloritoid epidote group lawsonite, pumpellyite melilite group beryl, cordierite, tourmaline axinite.
Journal ArticleDOI
The genesis of basaltic magmas
David H. Green,A.E. Ringwood +1 more
TL;DR: In this paper, the results of a detailed experimental investigation of fractionation of natural basaltic compositions under conditions of high pressure and high temperature were reported, where a single stage, pistoncylinder apparatus has been used in the pressure range up to 27 kb and at temperatures up to 1500° C to study the melting behaviour of several basaltics compositions.
Journal ArticleDOI
Average chemical compositions of some igneous rocks
TL;DR: In this paper, the average chemical compositions for the common plutonic rock types and their volcanic equivalents are given for the general average chemical composition of silicic, intermediate, subsilicic and ultramafic igneous rocks.
Journal ArticleDOI
Eclogites and Eclogites: Their Differences and Similarities
TL;DR: In this article, a comparison of eclogites from different geologic occurrences but with similar bulk compositions demonstrates variation in Ca-Mg partition between coexisting garnet and pyroxene.