Results 101 to 110 of about 2,766 (215)

A contribution to the petrology of kimberlites

, 2013
The petrogenetic relationships of the different varieties of kimberlite in the De Beers Mine and Letseng-Ia-terai composite diatremes have been investigated using petrographic and chemical methods.
Kruger, Floris Johan
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Thermal State and Thickness of the Lithospheric Mantle Beneath the Northern East-European Platform: Evidence from Clinopyroxene Xenocrysts in Kimberlite Pipes from the Arkhangelsk Region (NW Russia) and Its Applications in Diamond Exploration

Geosciences
This paper presents the reconstruction of the architecture of the lithospheric mantle, including its thermal state and thickness, as well as the scale and efficiency of its sampling by four kimberlites from the Arkhangelsk diamondiferous province ...
Elena Agasheva, Alyona Gudimova, Elena Malygina, Alexey Agashev, Alexey Ragozin, Elena Murav’eva, Anna Dymshits   +6 more
doaj   +1 more source

Selective leach geochemistry of soils overlying the 95-2, B30 and A4 kimberlites, northeastern Ontario

, 2006
Studies were carried out by the Geological Survey of Canada and the Ontario Geological Survey at the B30, A4 and 95-2 kimberlites in the glaciated terrain of northeastern Ontario, Canada to evaluate the effectiveness of selective leaches for detecting ...
S M Hamilton, M B McClenaghan, A K Burt, B A Kjarsgaard, G E M Hall   +4 more
core   +1 more source

A Machine Learning Approach to Single Garnet Geothermometry and Application to Tracing the Fingerprint of Superdeep Diamonds

Geochemistry, Geophysics, Geosystems
Estimating the equilibration temperatures of mantle‐derived garnets is crucial for assessing the diamond potential of kimberlites. Traditional garnet geothermometers require co‐existing mineral data or costly trace element analysis, limiting their ...
Qiwei Zhang, Matthew F. Hardman, Thomas Stachel, Ingrid Chinn, Michael Seller, Bruce Kjarsgaard, D. Graham Pearson   +6 more
doaj   +1 more source

Diamonds from the Coromandel Area, West Minas Gerais State, Brazil: an update and new data on surface sources and origin

Brazilian Journal of Geology
Important diamond deposits southeast of Coromandel and the local geology have been studied in an attempt to understand what surface source provided the stones.
Joachim Karfunkel, Donald Hoover, Augusto Fonseca Fernandes, Geraldo Norberto Chaves Sgarbi, Klaus Kambrock, Gustavo Diniz Oliveira   +5 more
doaj   +1 more source

The discovery of kimberlites in Antarctica extends the vast Gondwanan cretaceous province

, 2013
Kimberlites are a volumetrically minor component of the Earth's volcanic record, but are very important as the major commercial source of diamonds and as the deepest samples of the Earth's mantle. They were predominantly emplaced from =2,100 Ma to =10 ka
Nichols, GT (15580319), Belousova, E (15580322), Vadim Kamenetsky (14740705), Yaxley, GM (15482015), Rosenthal, A (15497258), Norman, M (15551522), Maas, R (15490724)   +6 more
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Mineralogy of garnets from the Jubileinaya kimberlite pipe and Ottorzhenets kimberlite body

Руды и металлы
The article presents results of a study of the chemical composition of garnet xenocrystals from a concentrate of the heavy fraction of kimberlites from the Yubileinaya pipe and Ottorzhenets kimberlite body.
Milaushkin M. V., Mal’kovets V. G., Gibsher A. A., Yakovlev I. V., Tychkov N. S.   +4 more
doaj   +1 more source

Mineralogy and geochemistry of Devonian ultramafic minor intrusions of the southern Kola Peninsula, Russia: implications for the petrogenesis of kimberlites and melilitites

, 1998
Minor magmatic intrusions of kimberlite, melilitite and cpx-melilitite occur in the southern part of the Kola Peninsula, Russia, on the Terskii Coast and near the town of Kandalaksha.
Sablukov, S.M., Beard, Andrew, Downes, Hilary, Vetrin, V.R., Balogh, K., Hegner, E.   +5 more
core   +1 more source

Evolving mantle convection from bottom up to top down. [PDF]

Innovation (Camb), 2022
Mitchell RN, Brown M, Gernon TM, Spencer CJ.   +3 more
europepmc   +1 more source

Backtracking potential mantle sources of North American kimberlites through kinematic models to constrain their origin [PDF]

Master of ScienceDepartment of GeologyClaudia AdamKimberlites are relatively rare ultramafic igneous rocks that are most commonly emplaced on Archean cratons.
Lee, Esther
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