Journal ArticleDOI
Strontium-isotopic geochemistry of the Mbuji Mayi and Kundelungu kimberlites (Zaire, Central Africa)
Daniel Demaiffe,M. Fieremans +1 more
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In this article, two main kimberlitic fields have been recognized: one at Mbuji Mayi (Kasai province) of Late Cretaceous age and the other on the Kundelungu plateau (Shaba province).About:
This article is published in Chemical Geology.The article was published on 1980-01-01. It has received 22 citations till now. The article focuses on the topics: Kimberlite & Phenocryst.read more
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Nitrogen and carbon isotopic composition in the diamonds of Mbuji Mayi (Zaïre)
TL;DR: In this paper, the isotopic composition of nitrogen in large diamonds from the Mbuji Mayi kimberlite district (Zaire) showed a large range of variation (100
Journal ArticleDOI
UPb and LuHf isotopes in baddeleyite and zircon megacrysts from the Mbuji-Mayi kimberlite: constraints on the subcontinental mantle
TL;DR: In this paper, the authors analyzed megacrysts of baddeleyite and zircon from the diamond-bearing Mbuji-Mayi kimberlite to determine their age, origin, and mantle source characteristics.
Journal ArticleDOI
Isotopic and elemental evidence for a relationship between kimberlite and Zaire cubic diamonds
T. Akagi,Akimasa Masuda +1 more
TL;DR: The results of the present study support the genesis of fluid inclusions in diamond in the kimberlite or in the source of kimbergite magma as mentioned in this paper. But the results of this study are limited.
Journal ArticleDOI
Zircon from the Mantle: A New Way to Date Old Diamonds
Peter D. Kinny,Henry O. A. Meyer +1 more
TL;DR: The first successful dating by the SHRIMP U-Pb method of a tiny, single zircon inclusion in a natural diamond from a kimberlite at Mbuji Mayi, Zaire was reported in this article.
Journal ArticleDOI
Metasomatic mantle origin for Mbuji-Mayi and Kundelungu garnet and clinopyroxene megacrysts (Democratic Republic of Congo)
TL;DR: In this article, the pyrope-rich megacrysts can be subdivided in three groups on the basis of their Cr contents: low-Cr (0.00-1.79 wt.%Cr2O3 ;M g # : 72.8-84.0); medium-cr (1.93-5.16 wt).
References
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Strontium Isotope Geology
Gunter Faure,James L. Powell +1 more
TL;DR: In this paper, the Rubidium-Strontium Isochron method was used to measure the geologic time of a given sample, which was then used to calculate the initial 87Sr/86Sr ratio of the sample.
Journal ArticleDOI
An assessment of local and regional isotopic equilibrium in the mantle
TL;DR: In this article, the authors assess the scale of isotopic heterogeneity in a partially molten asthenosphere and assess the available experimental data on diffusion kinetics in minerals and melts similar to those existing in the mantle, showing that a fluid-free mantle can maintain a state of disequilibrium on a centimeter scale for periods of 108 to 109 years.
Journal ArticleDOI
87Sr/86Sr in Precambrian carbonates as an index of crustal evolution
Ján Veizer,William Compston +1 more
TL;DR: In this article, the Sr isotopic composition of seawater was measured on carbonate rocks and a composite pattern during geologic history was shown. But the trend closely resembles the K2O/Na2O secular variations in composition of igneous and sedimentary rocks and probably reflects the fractionation state of the contemporary crust.
Proceedings ArticleDOI
The ages and uranium contents of zircons from kimberlites and associated rocks
Journal ArticleDOI
Geochemistry of ultramafic inclusions from Salt Lake Crater, Hawaii, and from Southern African kimberlites
TL;DR: In this article, the trace element variations in lherzolites and olivine eclogites were measured in clinopyroxenes separated from seventeen ultramafic inclusions from Salt Lake Crater, Hawaii, and nine from Southern African kimberlites.