Results 71 to 80 of about 3,644 (268)

The Kaapvaal craton seismic anisotropy: Petrophysical analyses of upper mantle kimberlite nodules

, 2001
International audienceA dense network of seismic stations has been deployed on the Kaapvaal craton (South Africa) to investigate the upper mantle seismic structures. In order to bring independent petrophysical constraints, we analyze a direct sampling of
Barruol, Guilhem, Ben-Ismail, W, Mainprice, D   +2 more
core   +3 more sources

Magnetic surface geometry inversion of Kimberlites in Botswana

Geophysical Prospecting, Volume 72, Issue 9, Page 3524-3546, November 2024.
Abstract Surface geometry inversion of geophysical data has recently been introduced as an effective approach for generating surface‐based geological models. The models obtained through surface geometry inversion clearly delineate the contacts between distinct rock units, making them easily interpretable by geologists.
Saeed Vatankhah, Peter G. Lelièvre, Kitso Matende, Kevin Mickus   +3 more
wiley   +1 more source

Kyanite-bearing eclogite xenoliths from the Udachnaya kimberlite, Siberian craton, Russia [PDF]

BSGF - Earth Sciences Bulletin, 2017
Xenoliths brought up by kimberlite magmas are rare samples of otherwise inaccessible lithospheric mantle. Eclogite xenoliths are found in most cratons and commonly show a range of mineral and chemical compositions that can be used to better understand ...
Radu Ioana-Bogdana, Moine Bertrand, Ionov Dmitri, Korsakov Andrey, Golovin Alexander, Mikhailenko Denis, Cottin Jean-Yves   +6 more
doaj   +1 more source

Review of South African research on volcanic and related rocks and mantle-derived materials : 1999-2002 [PDF]

, 2003
This report reviews South African research relating to the scientific interests of the International Association of Volcanology and Chemistry of the Earth's Interior (IAVCEI) and which was published between 1999 and 2002.
Marsh, J S
core   +1 more source

Geological and Petrographic Characteristics of Kimberlite Pipes

Вестник Пермского университета. Геология, 2016
Studies of the geological structure and petrochemical composition of the Siberian Platform kimberlites indicated complexity, diversity of geological, tectonic, and paleogeographic situations, which must be considered for proper prospecting-exploration for diamonds in each area of investigation.
openaire   +3 more sources

Geochemistry of forty‐one eclogitic and pyroxenitic mantle xenoliths from the Central Slave Craton, Canada (Ekati Diamond Mine)

Geoscience Data Journal, Volume 11, Issue 4, Page 825-832, October 2024.
Xenoliths from the Ekati kimberlite (Slave Craton, Canada) (left) show a large range of neodymium (εNd) and strontium isotopic ratios. Abstract This article describes a novel dataset on non‐diamondiferous eclogite and garnet pyroxenite xenoliths from four kimberlite pipes of the Ekati Diamond Mine (Central Slave Craton, Canada).
D. E. Jacob, A. Fung
wiley   +1 more source

Tunguska Dark Matter Ball

, 2015
It is suggested that the Tunguska event in June 1908 cm-large was due to a cm-large ball of a condensate of bound states of 6 top and 6 anti-top quarks containing highly compressed ordinary matter. Such balls are supposed to make up the dark matter as we
Froggatt, C. D., Nielsen, H. B.
core   +1 more source

The provenance of Borneo's enigmatic alluvial diamonds:A case study from Cempaka, SE Kalimantan [PDF]

, 2016
Gem-quality diamonds have been found in several alluvial deposits across central and southern Borneo. Borneo has been a known source of diamonds for centuries, but the location of their primary igneous source remains enigmatic.
Atkinson, Barnes, Barron, Barron, Barron, Belousova, Bergman, Bergman, Bergman, Bernet, Black, Bosshart, Burgath, Carter, Carter, Claoué-Long, Clements, D. Tanner, Davies, Davies, Deighton, Eggins, Eggins, Eggins, Emmet, Evans, Fipke, G. Yaxley, Galbraith, Galbraith, Gleadow, Gordeev, Govindaraju, Graham, Granath, Green, Green, Griffin, Guntoro, Hall, Hall, Hall, Hall, Hamilton, Hartano, Hattori, Hattori, Hennig, I. Graham, Jaques, Jaques, Karpov, Katili, Kolff, Koolhoven, Krol, Krol, L. Barron, L. Spencer, L.T. White, Lister, Longerich, Ludwig, Ludwig, Metcalfe, Metcalfe, Metcalfe, Mitchell, Miyashiro, Muller, Nixon, Parkinson, Pidgeon, Pownall, Pownall, R. Hall, R.A. Armstrong, Ridd, Robinson, Rocholl, Sambridge, Seavoy, Shirey, Sigit, Sikumbang, Simandjuntak, Smit, Smith, Smyth, Smyth, Soeria-Atmajda, Spencer, Steiger, Sun, Swamidharma, T.M. van Leeuwen, Taylor, van Bemmelen, van Leeuwen, van Leeuwen, van Leeuwen, van Leeuwen, Vance, Wagner, White, White, Wiedenbeck, Williams, Win, Witts, Witts, Yang, Zientek   +112 more
core   +2 more sources

LITHOLOGY OF KIMBERLITE PIPE ORFICE OF CAMACHIA

Collection of Scientific Works of the Institute of Geological Sciences of the NAS of Ukraine, 2014
Впервые алмазы были открыты в Анголе в 1912 г.. В последующие 40 лет добыча алмазов велась из аллювиальных отложений. К настоящему времени в стране выявлено около 700 кимберлитовых месторождений. Кимберлитовой трубки Камачия введена в эксплуатацию в 2005 году.
openaire   +3 more sources

Confocal Raman spectroscopic study of melt inclusions from peridotite xenoliths in economic and barren kimberlites from Kaapvaal Craton

Journal of Raman Spectroscopy, Volume 55, Issue 10, Page 1090-1104, October 2024.
Olivine‐hosted secondary melt inclusions in xenoliths from five Kaapvaal craton kimberlites of variable diamond grade do not show difference in composition. The composition of 26 minerals identified in the daughter phases suggests carbonate melt rich in alkali, sulfur, chlorine, and phosphorus infiltrated the kimberlite xenoliths.
Sahroz Khan, Yana Fedortchouk, Monika Feichter, Tivadar M. Toth   +3 more
wiley   +1 more source