Results 51 to 60 of about 165 (135)

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

When a Plateau Suppresses a Plume: Disappearance of the Samoan Plume Under the Ontong Java Plateau

AGU Advances, Volume 5, Issue 4, August 2024.
Abstract The Samoan hotspot generated an age‐progressive volcanic track that can be traced back to 24 Ma at Alexa Bank, but the trace of the older portion (>24 Ma) of the hotspot track is unclear. We show that six seamounts located in and around the Magellan Seamount chain—north of the Ontong‐Java Plateau (OJP)—have ages (87–106 Ma), geochemistry, and ...
M. G. Jackson, V. A. Finlayson, Bernhard Steinberger, Kevin Konrad   +3 more
wiley   +1 more source

Crater formation and erosional truncation of Arkhangelskaya kimberlite pipe (Russia)

Известия высших учебных заведений: Геология и разведка, 2019
The Late Devonian kimberlite pipes Arkhangelskaya, Pionerskaya, named after Grib, as well as a number of other pipes, have full sections of crater tufogenic and terrigenous deposits in the Zimneberezhny diamondiferous region, the thickness of which is ...
A. V. Bolonin, P. A. Ignatov, A. V. Petrov   +2 more
doaj   +1 more source

Ancient Craton‐Wide Mid‐Lithosphere Discontinuity Controlled by Pargasite Channels

Geophysical Research Letters, Volume 51, Issue 9, 16 May 2024.
Abstract The mechanisms governing a commonly observed seismic velocity drop in the cratonic lithosphere, referred to as the mid‐lithospheric discontinuity (MLD), have been widely debated. To identify the composition and seismic structure of MLDs, we have analyzed Sp receiver functions (SRF) and mantle xenocrysts for six regions across Australia.
Z. J. Sudholz, P. Zhang, C. M. Eakin, G. M. Yaxley, A. L. Jaques, C. Frigo, K. Czarnota   +6 more
wiley   +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

Clarification of red-colored rocks of Cambrian in Nakyn ore field of Yakutian diamondiferous province

Известия высших учебных заведений: Геология и разведка, 2016
Clarification of terrigeneous-carbonate red-colored rocks of Cambrian was researched in Nakyn ore field of Yakutian diamonditerous province. The study was provided by the core data of prospecting and exploration holes, which drilled near and through ...
P. A. Ignatov, N. R. Zaripov, O. K. Kilizhekov, L. V. Liskovaya   +3 more
doaj   +1 more source

Three‐dimensional structural‐material models of the formation of the Nyurbinskaya and Botuobinskaya kimberlite pipes (Yakutian Diamondiferous Province, Russia)

Геодинамика и тектонофизика, 2019
The Nyurbinskaya and Botuobinskaya kimberlitic pipes were in the focus of a comprehensive study aimed to investigate their structural and material positions as the main deposits in the Nakyn field (Yakutian Diamondife‐ rous Province, Russia).
E. V. Serebryakov, A. S. Gladkov, D. A. Koshkarev   +2 more
doaj   +1 more source

Inference of minerals at Redondão kimberlite crater, Parnaíba Basin, Brazil, based on interpretation of airborne gamma-ray spectrometry and ASTER data

Journal of the Geological Survey of Brazil
This work reports how minerals at Redondão kimberlite pipe may be inferred through integrated interpretation of airborne gamma-ray spectrometry data and multispectral images derived from Advanced Spaceborne Thermal Emission and Reflection Radiometer ...
Adolfo Silva
doaj   +1 more source

The evolution of the crustal stress state of the Catoca kimberlite pipe area (northeastern Angola)

Геодинамика и тектонофизика, 2018
This paper presents the first results of the geostructural and tectonophysical studies of the crustal stress state in the Catoca kimberlite pipe area at the southwestern flank of the Kasai Shield in the northeasternAngola. In the evolution of the crustal
O. V. Lunina, A. S. Gladkov, D. P. Gladkochub, F. João, M. A. Karpenko, J. T. Félix, D. A. Koshkarev, E. V. Sklyarov   +7 more
doaj   +1 more source

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