Results 41 to 50 of about 2,766 (215)

Komatiites, kimberlites, and boninites [PDF]

Journal of Geophysical Research: Solid Earth, 2003
When the mantle melts, it produces ultramafic magma if the site of melting is unusually deep, the degree of melting is unusually high, or the source is refractory. For such melting to happen, the source must be unusually hot or very rich in volatiles. Differing conditions produce a spectrum of ultramafic magma types.
openaire   +3 more sources

GENESIS OF EXTREMELY MAGNESIAN DAUGHTER OLIVINE OF SECONDARY MELT INCLUSIONS FROM OLIVINE MACROCRYSTS IN KIMBERLITE FROM THE UDACHNAYA-EAST PIPE (SIBERIAN CRATON)

Геодинамика и тектонофизика
The paper presents the results of studies of daughter olivine within secondary melt inclusions marking healed cracks in olivine macrocrysts from unserpentinized kimberlite from the Udachnaya-East pipe.
A. A. Tarasov, A. V. Golovin
doaj   +1 more source

PREDICTION OF THE PRIMARY SOURCES OF GIANT CLIPPIR DIAMONDS IN THE NORTH OF YAKUTIA BY THE METHOD OF MINERALOGICAL AND GEOCHEMICAL ANALOGY (METHOD 5E DIAGRAMS)

Геодинамика и тектонофизика
The finds of giant CLIPPIR-type diamonds in the placers hosted by the Ebelyakh River basin in the north of Yakutia suggest that similar diamonds can be found in the kimberlites of the Anabar region and the nearest northern deposits located within the ...
A. S. Ivanov, V. N. Zinchenko, I. V. Ashchepkov, S. A. Babushkina, O. B. Oleinikov, P. N. Shelkov   +5 more
doaj   +1 more source

Impact‐diagnostic criteria for use in confirming a meteorite impact origin of terrestrial geological structures: Recommendations by the Impact Cratering Committee of the Meteoritical Society

Meteoritics &Planetary Science, EarlyView.
Abstract The framework of the Impact Cratering Committee (ICC) of the Meteoritical Society was approved in 2020, with the first committee members appointed in 2023. The ICC has a mandate to (1) approve, maintain, and update a database of confirmed terrestrial meteorite impact structures, (2) define and regularly update the criteria used for ...
A. J. Cavosie, S. Alwmark, D. Baratoux, G. Consolmagno, L. Ferrière, S. Goderis, N. Hauser, T. Kenkmann, C. Koeberl, G. R. Osinski, A. E. Pickersgill, M. Schönbächler   +11 more
wiley   +1 more source

Micro-geochemistry of the mantle and its volcanic rocks [PDF]

, 2010
This thesis comprises three studies which utilise detailed micro-sampling techniques to understand the effects of melt infiltration in the continental lithosphere and the relationship of deeply derived kimberlite melts to lithospheric processes.
MALARKEY, JACQUELINE
core  

A XENOLITH-BASED LITHOSPHERIC TRANSECT OF THE SLAVE CRATON, N.W.T., CANADA [PDF]

, 2012
During the last decade, the Canadian Slave craton has emerged as an important global diamond resource. Recent work on the sub-continental lithospheric mantle (SCLM) beneath this craton has yielded tantalising suggestions about its structure and ...
MATHER, KATHLEEN,ANN
core  

The principal morphogenetic characteristics of kimberlite indicator minerals

Руды и металлы
The article provides information on the morphology and morphogenesis of minerals from kimberlites and their scattering halos. The principal morphogenetic characteristics of the main kimberlite indicator minerals are discussed in detail.
Khmelkov A. M., Chuguevskaya E. A.
doaj   +1 more source

Comparative Study of the Kimberlites of Bakwanga (North Group) and Bakwa-Kalonji (South Group) In East Kasai, Democratic Republic of Congo.

Analecta
The presence of kimberlites in the Democratic Republic of Congo has been known since buttgenbach reported a typical ‘yellow ground’ in Katanga as early as 1908, and prospecting work before and after 1914 had already identified twenty-four pipes in ...
Onya Ngila Arnold, Kampata Mbwelele Dona, Koy Kasongo Ruben, Cibumba Cibumba Alain, Fwani Pambu Chamira, Kisambu Thigana Déogracias, Djonive Munene   +6 more
doaj   +1 more source

Tracking the Late Jurassic apparent (or true) polar shift in U‐Pb‐dated kimberlites from cratonic North America (Superior Province of Canada)

Geochemistry, Geophysics, Geosystems, 2015
Different versions of a composite apparent polar wander (APW) path of variably selected global poles assembled and averaged in North American coordinates using plate reconstructions show either a smooth progression or a large (∼30°) gap in mean ...
Dennis V. Kent, Bruce A. Kjarsgaard, Jeffrey S. Gee, Giovanni Muttoni, Larry M. Heaman   +4 more
doaj   +1 more source

The geochemistry and geochronology of Tanzanian kimberlites [PDF]

, 2012
© 2012 Dr. Rachel CheslerThe Tanzanian Craton is host to numerous kimberlite intrusions, although few have been studied in any detail. Due to its proximity to the East African rift zone, this region also provides a unique opportunity to investigate the ...
Chesler, Rachel
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