diopside with majoritic garnet inclusions which contain pyroxene in solid solution (Irifune and Ringwood 1987). The second association (termed type I, Table 1) ...
Slave province. J. Geophys. Res., 103, 21183-21200. Bowring, S.A. & Williams, I.S. (1999): Priscoan (4.00-4.03 Ga) orthogneisses from northwestern Canada.
Syngenetic mineral inclusions in diamonds are pristine witnesses of the chemical and mineralogical environment during diamond formation and thus represent ...
Mo¨ssbauer spectroscopy on inclusions in diamonds from SaËo Luiz, Brazil, ... Luiz River, Brazil (1â3), provides an op- ..... Saturn, Titan, and Neptune (10, 11).
support diamond formation: they are ultramafic (or peridotitic) (U-type) and eclogitic ... Key-words: diamond, olivine, inclusions, minor elements, Siberian Craton, ...
university or equivalent geology, and have already been told what to look for in the field. .... to cover various types of geological fieldwork in various climates; refer to it before first ..... of wind and blowing across the landscape. Loose-leaf .
vial and residual gravels on granulite facies rocks ... suggest various types of source rock for corundum .... or whitish colour as in star stones (star effect due.
Ni metal, F â fluorine riebeckite and topaz, Cl â vanadinite. Sodium in garnet was analysed with TAP crystal, time of measurement 30 s on peak, 15 s on ...
Inclusions of olivine, diopside and enstatite. All three minerals are present as texture-I inclusions in each of two pyrope crystals (GRPy-8 and GRPy-15). 165 ...
Sep 15, 2010 - ... association with cracks, magmatic crystal forms, and lack of exchange with .... NGC zircons hosting inclusions were documented with a LEO.
Dec 7, 2015 - Ar7. Ar9. Ar11. Ar26. Ar6. ZH10. ZH26. ZH8. Location. G. Arais. G. Abu Dahr. G. Balamhindit. G. Arais. G. Abu Dahr. SiO2. 0.00. 0.00. 0.00. 0.00.
Feb 16, 2007 - The tomographic image revealed the existence of three different mineral fractions, whose densities and effective atomic numbers, as calculated.
Tomra Sorting Solutions, Randburg, South Africa. ⡠Mineral Resources, Lucara Diamond Corp,. Vancouver BC, Canada. § Karowe Diamond Mine, Letlhakane, ...
cal range that comprises the zincian chromite inclusions found in diamonds. ..... metasomatism in Northwest Nelson, New Zealand. Canadian. Mineralogist, 33 ...
carats, for an ore grade of some 27,000 ct/ton, were found in a small (4 X 5 x 6 cm) eclogite, U51/3, from Udachnaya. Based upon 3~D imaging, the diamonds ...
Allsopp, H.L., Bristow, J.W., Smith, C.B., Brown,. R., Gleadow, A.J.W., Kramers, J.D., and ... mentation: A tribute to Francis R. (Joe) Boyd: Houston, Texas, The ...
DIs was considered as syngenetic. Inherent in this group is the requirement of formation of the inclusion and its host diamond at exactly the same instant and by ...
Department of Mineralogy, British Museum (Natural History), Cromwell Road,. South Kensington, London SW7 5BD, Great Britain. Abstract : Cervelleite, Ag4TeS ...
ir for Scientific Research from the Ministry of Educa- .... Miharaite contains Cu, Fe, Pb, Bi, and S, as is ... The a-factors for the Cu-Fe-Pb-Bi sulfides were ob-.
Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, UK. T. C. BIRKETr ... associated with fluorite, at the Grand Reef mine, Graham County, Arizona, USA. Other associated ... Laurel Canyon, and is about four miles NE of. K
65 di Scienze Naturali di Torino, Sezione di Mineralogia, Petrografia e Geologia, via Giovanni. 66. Giolitti 36, Iâ10123 Torino, Italy, catalogue number M/15941.
a half hours, passing the village of Agua Castilla, which is close to the large .... Sulfide minerals (chalcopyrite, pyrite, marca- site, covellite and phases belonging ...
ABB supplies mine electrification and automation solutions, such as ... Open-pit (cast) mining and bulk material handlin
'glory hole' at the Grand Reef mine, Graham County,. Arizona, USA. The inorganic equivalent of shanno- nite is well-known chemically; it is one of a series of.
that highly depleted cratonic lithosphere at the time of diamond formation extended to ... geothermobarometry indicates that the formation of peridotitic diamonds ...
Mineralogy and Petrology https://doi.org/10.1007/s00710-018-0604-9
ORIGINAL PAPER
Mineral inclusions in diamonds from Karowe Mine, Botswana: super-deep sources for super-sized diamonds? Theetso Motsamai 1
&
Jeffrey W. Harris 2 & Thomas Stachel 1 & D. Graham Pearson 1 & John Armstrong 3
Received: 29 November 2017 / Accepted: 4 June 2018 # Springer-Verlag GmbH Austria, part of Springer Nature 2018
Abstract Mineral inclusions in diamonds play a critical role in constraining the relationship between diamonds and mantle lithologies. Here we report the first major and trace element study of mineral inclusions in diamonds from the Karowe Mine in north-east Botswana, along the western edge of the Zimbabwe Craton. From a total of 107 diamonds, 134 silicate, 15 oxide, and 22 sulphide inclusions were recovered. The results reveal that 53% of Karowe inclusion-bearing diamonds derived from eclogitic sources, 44% are peridotitic, 2% have a sublithospheric origin, and 1% are websteritic. The dominant eclogitic diamond substrates sampled at Karowe are compositionally heterogeneous, as reflected in wide ranges in the CaO contents (4–16 wt%) of garnets and the Mg# (69–92) and jadeite contents (14–48 mol%) of clinopyroxenes. Calculated bulk rock REEN patterns indicate that both shallow and deep levels of the subducted slab(s) were sampled, including cumulate-like protoliths. Peridotitic garnet compositions largely derive from harzburgite/dunite substrates (~90%), with almost half the garnets having CaO contents
