Journal ArticleDOI
A methodology for wavelength dispersive electron probe microanalysis of unpolished silicate minerals
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In this paper, the precision and accuracy of electron probe microanalysis of unpolished garnet, olivine, orthopyroxene and clinopyroxenes grains by comparison of analyses performed on polished thin sections of the same minerals are evaluated.About:
This article is published in Journal of Geochemical Exploration.The article was published on 2015-12-01. It has received 10 citations till now. The article focuses on the topics: Silicate minerals.read more
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Journal ArticleDOI
Dated eclogitic diamond growth zones reveal variable recycling of crustal carbon through time
TL;DR: In this paper, the authors presented a dating of individual eclogitic silicate inclusions from the Orapa and Letlhakane diamond mines, Botswana, and inferred that older diamonds from these two localities are more likely to have light δ13C due to greater subduction of biogenic sediments that may be related to hotter and more reduced conditions in the Archaean before the Great Oxidation Event at 2.3 Ga.
Journal ArticleDOI
Archaean and Proterozoic diamond growth from contrasting styles of large-scale magmatism.
TL;DR: It is shown that two suites of diamonds define two isochrons, showing the importance of dating individual inclusions, and that there was a major change in the magmatic processes responsible for harzburgitic diamond formation beneath Venetia from the Archaean to the Proterozoic.
Trace elements in indicator minerals: area selection and target evaluation in diamond exploration
William L. Griffin,Chris Ryan +1 more
TL;DR: In this paper, the position of the local paleogeotherm can be derived from garnet concentrates, and the depth of origin of each garnet grain is determined by referral of its T n i to the derived geotherm.
Journal ArticleDOI
Formation of unusual yellow Orapa diamonds
TL;DR: Timmerman et al. as discussed by the authors extracted inclusions from 14 eclogitic diamonds from Orapa Mine (Botswana) with an unusual yellow colour and characterised for their growth structure, N systematics, and C isotope composition, and the major element composition of their silicate inclusions.
Journal ArticleDOI
Episodic diamond growth beneath the Kaapvaal Craton at Jwaneng Mine, Botswana
M.U. Gress,D. Howell,D. Howell,Ingrid L. Chinn,Laura Speich,Simon C. Kohn,Quint van den Heuvel,Ellen Schulten,Anna S. M. Pals,Gareth Davies +9 more
TL;DR: In this paper, the authors report new inclusion abundance data from the visual examination of ~130,000 diamonds that validate the predominance of an eclogitic diamond suite (up to 88%) with on average 5% inclusion-bearing diamonds (with inclusions > 10μm in size).
References
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Book ChapterDOI
Quantitative Analysis of Homogeneous or Stratified Microvolumes Applying the Model “PAP”
J. L. Pouchou,Françoise Pichoir +1 more
TL;DR: For about 20 years, quantitative analysis of homogeneous microvolumes has been performed with the aid of correction models which transform into mass concentrations C A the ratio k A between the emerging intensities from the specimen and a standard obtained for a characteristic line of element A.
Journal ArticleDOI
Origin of diamonds in old enriched mantle
TL;DR: Sub-calcic garnets encapsulated by diamonds from relatively young (90 Myr) kimberlites in southern Africa, yield ancient Sm-Nd and Rb-Sr model ages (3,200-3,300 Myr) as mentioned in this paper.
Journal ArticleDOI
An updated classification scheme for mantle-derived garnet, for use by diamond explorers
TL;DR: In this paper, a simple, robust garnet classification scheme is formulated, which accommodates empirical garnet-diamond relationships for peridotitic (G10, G9, G12), megacrystic (G1), Ti-metasomatised (G11), pyroxenitic(G4, G5) and eclogitic (g3) lithologies in eight distinct garnet classes.
Journal ArticleDOI
Characteristic fluorescence corrections in electron-probe microanalysis
TL;DR: In this paper, a method was developed for calculating characteristic fluorescence corrections in all cases involving K and L lines, based on the formula derived by Castaing for the case of one K line exciting another K line.
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