Results 171 to 180 of about 2,573 (214)

Degassing structures in volcaniclastic kimberlite: Examples from southern African kimberlite pipes

Journal of Volcanology and Geothermal Research, 2008
Kimberlite pipes are commonly filled with a distinctive structureless facies termed volcaniclastic kimberlite (previously also termed Tuffisitic Kimberlite Breccia, TKB), which constitutes a thorough mix of both juvenile material and lithic clasts derived from all stratigraphic levels.
Thomas M Gernon, R S J Sparks
exaly   +3 more sources

MANTLE XENOLITHS IN THE MATSOKU KIMBERLITE PIPE

Physics and Chemistry of the Earth, 1975
Abstract The chemical compositions of selected xenoliths from the Matsoku pipe and many constituent minerals are discussed. It is concluded that the xenoliths form a closely related suite of rocks of differing mineralogy and chemistry which could have been produced during a single igneous event in the mantle. It is likely that at solidus temperatures
J.J. Gurney, B. Harte, K.G. Cox
openaire   +1 more source

Kimberlites of the Manchary pipe: a new kimberlite field in Central Yakutia

Russian Geology and Geophysics, 2010
Abstract This paper reports new petrographic and mineralogical data on the Manchary kimberlite pipe, which was discovered south of Yakutsk (Central Yakutia) in 2007–2008, 100 km. The pipe breaks through the Upper Cambrian carbonate deposits and is overlain by Jurassic terrigenous rock masses about 100 m thick.
A.P. Smelov, A.P. Andreev, Z.A. Altukhova, S.A. Babushkina, K.A. Bekrenev, A.I. Zaitsev, E.D. Izbekov, O.V. Koroleva, V.M. Mishnin, A.V. Okrugin, O.B. Oleinikov, A.A. Surnin   +11 more
openaire   +1 more source

Geomechanical conditions of kimberlite extraction in terms of internatsionalnaya kimberlite pipe

Journal of Mining Science, 2009
The paper analyzes geomechanical conditions of slicing method application to extract a vertical ore body in terms of Internatsionalnaya kimberlite pipe. The authors assess stability of stopes at principal stages of horizon mining.
V. D. Baryshnikov, L. N. Gakhova
openaire   +1 more source

Kimberlite metasomatism at Murowa and Sese pipes, Zimbabwe

Lithos, 2004
exaly   +4 more sources

Model of a kimberlite pipe

Physics and Chemistry of the Earth, 1975
Abstract The model of a kimberlite pipe depicts a hypothetical pipe having a diameter of 300 m at a level equivalent to the post-erosional (present-day) surface of the major pipes in the Kimberley area. Below this reference level the pipe configuration and composition illustrate features typical of the Kimberley occurrences.
openaire   +1 more source

On the geological-prospecting types of kimberlite pipes

Proceedings of the Komi Science Centre of the Ural Division of the Russian Academy of Sciences, 2023
The conducted research on geological structure and material composition of the Siberian platform kimberlites indicated the complexity and diversity of geologic-tectonic and paleogeographic conditions which should be considered when performing the prediction-prospecting works for diamonds in every particular region.
openaire   +1 more source

Unaltered kimberlite of Internationalnaya pipe (Mirny field)

Ores and metals, 2021
The porphyry kimberlite block (intrusive coherent kimberlite, after Scott-Smith, 2013) on the deep horizons of the Internationalnaya pipe is characterized by the lack of olivine macrocryst serpentinization, and the minimum degree of postmagmatic alteration in the matrix minerals.
Bogdan Pomazansky, Richard Monkhorov, Tat’yana Antonova, Vladimir Malkovets, Alexey Kulagin, Marina Shalkina, Viktoria Batyr, Alexey Sobakin   +7 more
openaire   +1 more source

Petrology of the Yubileynaya kimberlite pipe: application to the variation of kimberlites composition with the depth

2020
<p>In this paper are summarized investigation results on the chemistry, petrography and mineralogy of kimberlitic rocks of the upper and deep levels of the Yubileynaya pipe. There are given original data on mineral phases contents in kimberlite ground mass,distribution of indicator minerals and olivine and its pseudomorphoses as ...
Zdislav Spetsius, Alexander Ivanov
openaire   +2 more sources

Bitumens in the Mir Kimberlite Pipe (Yakutia)

Geochemistry International
Solid bitumen in the Mir kimberlite pipe form vein-like segregations several centimeters in size. They are distributed irregularly in the pipe body, regardless of the kimberlite breccia varieties distribution. Bitumen content in kimberlites ranges from 0.001 wt% to 0.12 wt%.
F. V. Kaminsky, I. V. Konopleva, V. L. Skvortsova, O. V. Kuznetsova   +3 more
openaire   +2 more sources