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Harris Syngenetic inclusions in diamond from the Birim Ā®eld (Ghana) Ā± a deep peridotitic proĀ®le with...inclusions from placer deposits (Akwatia mine) along the Birim River, Ghana were studied, thus providing...contents indicate an almost exclusively peridotitic diamond suite, with the vast majority being part of the...harzburgitic paragenesis. Chemically the Akwatian diamond inclusions diĀer from those in our 1100 sample...(66.4 mol%) so far observed in an inclusion in diamond. The same garnet also contained a minor enstatite |
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Traceāelement geochemistry of diamondāhosted olivine inclusions from the Akwatia Mine, West African Craton: implications...implications for diamond paragenesis and geothermobarometry J. C. M. De Hoog1 Ā· T. Stachel2 Ā· J. W. Harris3...coexisting garnets included in diamonds from the Akwatia Mine (Ghana, West African Craton) were measured to show...similar information about equilibration temperature, diamond paragenesis and mantle processes as garnet. Trace-element...Conventional geothermobarometry indicates that Akwatia diamonds formed and resided close to a 39 mW/m2 |
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formation event documented on the worldās major diamond producing cratons occurs in Archean lithospheric...diamonds, G10 garnets, and diamond inclusion-type chromites, well used in diamond exploration. Within the...mantle domains of diamond stability, there have been repeated episodes of further diamond crystallization...peridotite. Using improved methods of isotope analysis, diamond formation ages can be correlated with specific...magmatic mantle refertilization. Fibrous cuboid diamond and fibrous coats on SCD are rough-surfaced diamonds |
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Springer-Verlag 1997 Thomas Stachel Ć” JeĀ W. Harris Diamond precipitation and mantle metasomatism Ā± evidence...chemistry of silicate inclusions in diamonds from Akwatia, Ghana Received: 27 January 1996 / Accepted: 5 May...clinopyroxene) included in diamonds from Akwatia (Birim Field, Ghana) were determined using SIMS. Incompatible...CO2bearing melts or ĀÆuids may thus be excluded. Diamond inclusion chemistry and mineralogy also is inconsistent...metasomatism by H2O-rich melts. We therefore favour diamond precipitation by oxidation of CH4-rich ĀÆuids with |
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Ver' "\ ~~ ā¢ THE MINERAL AND ROCK RESOURCES OF GHANA f btYON RALPH Dedicated to my parellfs for not...ISBN 90 6191 597 X paper edition only for sale in Ghana Ā© 1985 A.A.Balkema, P.O.Box I 675, 3000 BR Rotterdam...REPUBLIC OF GHANA- GEOGRAPHY,PHYSIOGRAPHY,GEOLOGY AND GEOHYDROLOGY 6 3. THE MINERALRESOURCESOF GHANA - BACKGROUND...EXPLOITATION IN GHANA 572 12. TABLES OF SUMMARY OF MINERAL AND ROCK RESOURCESOF GHANA 577 13. LEGISLATION...590 APPENDIX 597 INDEX 602 V Preface The Ghana Geological SuJ;"vey DepaJ;"tment in 1.962, published |
| (Fanus) Viljoen, K.S., Dobbe, RenƩ, Smit, Braam, Thomassot, Emilie, Cartigny, Pierre (2004) Petrology and geochemistry of a diamondiferous lherzolite from the Premier diamond mine, South Africa. Lithos, 77 (1) 539-552 doi:10.1016/j.lithos.2004.03.023 | Journal (article/letter/editorial) |
a diamondiferous lherzolite from the Premier diamond mine, South Africa K.S. (Fanus) Viljoen a,*, ReneĢ...diamondiferous peridotite xenolith from the Premier diamond mine in South Africa. The xenolith is altered with...6 x to 1.3x. These are broadly correlated with diamond nitrogen content as determined by infrared spectroscopy...Metasomatism occurred prior to, or accompanied, diamond growth. D 2004 Elsevier B.V. All rights reserved...reserved. Keywords: Peridotite; Lherzolite; Diamond; Kimberlite; Lithosphere; Infrared 1. Introduction This |
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inclusions in alluvial diamonds from the Kankan region of Guinea in West Africa are mainly of lherzolitic...exclusively lherzolitic garnets document that the diamond source experienced a previous stage of melt extraction...from the Monastery mine. Subsequently, the discovery of diamonds from the Brazilian mine SaĆo Luiz, which...MgSiO3, CaSiO3, SiO2 and a tetragonal almandine pyrope phase (Harte and Harris 1994; Harte et al. 1999)...the present study on diamonds from the Kankan district in Guinea, we will examine the major and trace |
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2007 Available online 22 April 2008 Keywords: Diamond formation Peridotitic Eclogitic Websteritic Subcratonic...suites and used to establish the characteristics of diamond source rocks in the subcratonic lithospheric mantle...(Kalahari Craton) is by far the best studied diamond source region in the world but appears to be unique rather...and trace element characteristics of peridotitic diamond sources indicate polybaric melt extraction proceeding...mounting evidence from xenolith studies, eclogitic diamond sources are linked to subducted oceanic protoliths |
| Stachel, Thomas, Aulbach, Sonja, Brey, Gerhard P., Harris, Jeff W., Leost, Ingrid, Tappert, Ralf, Viljoen, K.S.(Fanus) (2004) The trace element composition of silicate inclusions in diamonds: a review. Lithos, 77 (1) 1-19 doi:10.1016/j.lithos.2004.03.027 | Journal (article/letter/editorial) |
eclogitic diamond sources. The trace element composition of an āāaverage eclogitic diamond sourceāā based...about 10% of a partial melt in the garnet stability field and that subsequently experienced only minor reenrichment...inclusion. This suggests that sublithospheric diamond sources may be linked to old oceanic slabs, possibly...can provide the redox gradients necessary for diamond precipitation in an otherwise reduced sublithospheric...V. All rights reserved. Keywords: Inclusion in diamond; REE; Metasomatism; Lithosphere; Garnet; Majorite; |
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Abstract: Solid-phase mineral inclusions in diamond (1ā3 mm in diameter) from the No. 50 kimberlite...carbonate and sulfide inclusions were recovered in the diamond. The common solid-phase inclusions are olivine...and composition of the solid-phase inclusions in diamond indicate that they belong to the peridotitic suite...eclogitic mineral inclusions were found in the diamond. The slightly lower Mg # of the olivine inclusions...to 0.79 wt. %) in some chromite inclusions in diamond than those in chromite inclusions worldwide, the |
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Accepted: 7 January 1998 Abstract Syngenetic diamond inclusions from the Mwadui kimberlite reveal that...pairs suggests successive iron enrichment during diamond formation, e.g. leading to the presence of harzburgitic...harzburgitic garnet and lherzolitic olivine in the same diamond. Apart from the dominant peridotitic inclusion...association Fe-FeO-Fe3O4 in one single diamond indicates diamond formation over a large range of fO2 conditions...harzburgitic garnet and a SiO2-phase in the same diamond. Alternatively the formation of the SiO2phase may |
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inclusions record the conditions at the time of diamond crystallisation ( f 1200 jC; f 3.0 Ga). The lower...Phillips et al. / Lithos 77 (2004) 155ā179 between diamond and silicate inclusions. However, thermodynamic...Thermobarometry; De Beers Pool inclusions 1. Introduction Diamond provides an impermeable barrier that can insulate...sub-continental mantle lithosphere at the time of diamond formation. Most inclusions can be sub-divided into...temperature/pressure conditions and/or unique environments of diamond formation (e.g. Taylor et al., 1996; Sobolev et |
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ORIGINAL PAPER Structural relaxation and crystal field stabilization in Cr3+-containing oxides and silicates...oxygen-based Cr3?-containing minerals on the crystal field stabilization energy (CFSE) is considered. It is...m_taran@hotmail.com Keywords Trivalent chromium Crystal field stabilization energy Relaxation of solid solution...other physical properties. In the electrostatic field of a crystal lattice, the d-orbitals of transition-metal...of their electron configurations called crystal field stabilization energy (CFSE). The nature of CFSE |
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2004 Elsevier B.V. All rights reserved. Keywords: Diamond; Inclusion; Peridotite; Mantle metasomatism; REE;...characteristics of both peridotitic and websteritic diamond sources (Leost Inclusions were released by crushing...oxygen ions. The nominal Diamonds Single inclusions Pyrope garnet Orthopyroxene Mg-chromite Olivine Clinopyroxene...1997a; Stachel et al., 2000). The compositional field for lherzolitic garnets is from Sobolev et al. (1973)...(Cr2O3 of 2.6 ā 17.3 wt.%) of garnets is rare among diamond sources worldwide, and on the Kalahari Craton, |
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Akademika Osipāyana 4, Chernogolovka, 142432, Moscow Region, Russia b Science Facilities Department, Natural...set of trace elements (TE) in the partly molten diamond-forming peridotiteāeclogiteā carbonatite system...Model TE partition coefficients for the natural diamond-producing carbonatite melts of mantle chambers...minerals of peridotite and eclogite parageneses of diamond inclusions, on the one hand, and on the experimental...āmetasomatic agentsā in the formation of chambers of diamond-forming carbonatite magmas. Ā© 2015, V.S. Sobolev |
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THE PRESSURES AND TEMPERATURES OF FORMATION OF DIAMOND BASED ON THERMOBAROMETRY OF CHROMIAN DIOPSIDE INCLUSIONS...temperature (T) and pressure (P) of formation of natural diamond has generally relied on thermobarometry of rare...potential re-equilibration of touching minerals after diamond growth and possible disequilibrium between non-touching...inclusions of chromian diopside (mostly isolated) in diamond crystals containing inclusions of peridotitic material...conditions and relative timing of diamond genesis. Inclusions in diamond and xenoliths from the same source |
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Switzerland Keywords Majorite Ā· Garnet Ā· Chromium Ā· Diamond inclusions Ā· Depleted mantle Ā· Transition zone...peridotites (for instance in the Western Gneiss region of Norway), samples are found which contain garnets...(Haggerty and Sautter 1990). While rare, majoritic diamond inclusions are reported from cratons all over the...used. The majorite transformation reaction between pyrope (Mg3Al2Si3O12) and enstatite (MgSiO3) may be described...websteritic. A number of majoritic garnets from diamond inclusions are also plotted in the diagram (for |
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Coast. DIAMONDS: FROM BIRTH TO ETERNITY A diamond is rarely found embedded in kimberlite rock. This...update its diamond mining and reeovery inlormation, we asked the assistance ol John Roux, Diamond Information...to present Arthur Wilsonās compilation on the diamond and its origins. Richard T. Liddicoat, Jr. CONTENTS... 413 Index . 449 i\ LIST OF ILLUSTRATIONS Diamond (Color Plate).Frontispiece Lord Rutherford. 4 Radiometric...Radiometric dating. 5 Hannay's experiment. 11 Graphite-diamond equilibrium . 13 Convection cells . 15 Snider-Pelligrini |
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garnet peridotites. P-T estimates obtained for diamond-bearing and graphitebearing lherzolite xenoliths...evaluation of the diamond potential of kimberlite and lamproite provinces and in diamond exploration where...an indicator mineral that can be used to locate diamond-bearing pipes (Sobolev 1977; Ramsay 1992; Fipke...1995). However, not all Cr-diopside recovered in diamond exploration programs is likely to be of high-pressure...plot of Ca vs. Al) can be constructed to enable diamond-related Cr-diopside from garnetlherzolitic sources |
| Riches, Amy J.V., Liu, Yang, Day, James M.D., Spetsius, Zdislav V., Taylor, Lawrence A. (2010) Subducted oceanic crust as diamond hosts revealed by garnets of mantle xenoliths from Nyurbinskaya, Siberia. Lithos, 120 (3) 368-378 doi:10.1016/j.lithos.2010.09.006 | Journal (article/letter/editorial) |
t e / l i t h o s Subducted oceanic crust as diamond hosts revealed by garnets of mantle xenoliths from...Maryland, College Park, MD 20742, USA Institute of Diamond Industry, ALROSA Co. Ltd., Mirny, Yakutia, Russia...September 2010 Keywords: Yakutia Eclogite Craton Diamond Lithosphere formation a b s t r a c t The ~ 380...eclogites and pyroxenites represent signiļ¬cant diamond reservoirs in some portions of Archean lithosphere...(b350 Ā°C) in the mantle lithosphere underlying this region of the Siberian craton (Spetsius et al., 2008) |
| Wijbrans, C. H., Niehaus, O., Rohrbach, A., Pƶttgen, R., Klemme, S. (2014) Thermodynamic and magnetic properties of knorringite garnet (Mg3Cr2Si3O12) based on low-temperature calorimetry and magnetic susceptibility measurements. Physics and Chemistry of Minerals, 41 (5) 341-346 doi:10.1007/s00269-013-0653-x | Journal (article/letter/editorial) |
particular, Cr-rich garnets are commonly found in diamond inclusions and in deep-seated mantle xenoliths...often found in diamond-bearing mantle xenoliths and are also used as a so-called diamond indicator mineral...mineral in the diamond exploration industry (Cookenboo and Grutter 2010). However, the stability of Cr-bearing...Ca3Al2Si3O12 Grossular Mg3Al2Si3O12 Mg3Cr2 Si3O12 Pyrope Knorringite 320.9 Ā± 0.6 260.1 Ā± 0.5 301 Ā± 2...finds that knorringite has a higher entropy than pyrope (Haselton and Westrum 1980; Klemme et al. 2005) |
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East River Road, #1317 Tucson, AZ 85750 Natural diamond crystals are among the most elegant and charismatic...for world diamonds, and by the Russian Diamond Fund. Diamond can hardly be said to be a rare mineral...JanuaryāFebruary, 2004 species. One of the early diamond specialists was the British collector Sir Abraham...Hume (1749ā1838), whose fine collection of 107 diamond crystals was cataloged by Count de Bournon in 1815...dealer Henry Heuland), possessed 109 examples of diamond. Armand Levy, who prepared Turnerās published collection |
| Promprated, Prinya, Taylor, Lawrence A., Anand, Mahesh, Floss, Christine, Sobolev, Nikolai V., Pokhilenko, Nikolai P. (2004) Multiple-mineral inclusions in diamonds from the Snap Lake/King Lake kimberlite dike, Slave craton, Canada: a trace-element perspective. Lithos, 77 (1) 69-81 doi:10.1016/j.lithos.2004.04.009 | Journal (article/letter/editorial) |
As observed worldwide, the harzburgitic-garnet diamond inclusions (DIs) possess sinusoidal REE patterns...inclusion that occurs at the outer portion of a diamond compared to that near the core. The compositions...B.V. All rights reserved. Keywords: Snap Lake; Diamond inclusions; Trace element; REE; In situ analysis;...history of diamond inclusions (DIs) is crucial to understanding the processes involved in diamond formation...the Slave craton has become the āāepicenterāā of diamond exploration and mining, including a series of kimberlite |
| Promprated, Prinya, Taylor, Lawrence, Floss, Christine, Malkovets, Vladimir, Anand, Mahesh, Griffin, William, Pokhilenko, Nikolai, Sobolev, Nikolai (2003) Diamond Inclusions from Snap Lake, Nwt Canada, 8th International Kimberlite Conference Long Abstract. 1-5 | Other Paper |
DIAMOND INCLUSIONS FROM SNAP LAKE, NWT CANADA Prinya Promprated1, Lawrence Taylor1, Christine Floss2...Slave craton of Canada has been recognized for its diamond potential, with the discovery of diamondiferous...subsequently identified, some with great potential for diamond-bearing. The scientific interest resulting from...Slave craton (Fig. 1), are diamond-bearing, and arguably the largest diamond deposit yet discovered on...are olivine and enstatite, with small numbers of pyrope, chromite, clinopyroxene, and sulfide. The DIs |
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1947-1996 FEATURE ARTICLES 2 A Hi story of Diamond Sources in Africa: Part II A. f. A. (Bram) lanse...the world 's m ost important diam ond-producing region . Certainly. African sources contin ue to produce...sub missio n of art icles on all aspect s of th e field. Please see th e Suggest ions for Authors in th...excellence in inform ation that is Bob's gift to the field he so loved. Alice S. Keller, Editor Editorial...HISTORY OF DIAMOND SOURCES IN AFRICA: PART II ByA. ). A. (Bram) [anse Following the history of diamond di scovenes |