Results 51 to 60 of about 208 (182)

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

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

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

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

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

Tracing Deep Carbon Cycling by Zinc Isotopes in a Peralkaline‐Carbonatite Suite

Geochemistry, Geophysics, Geosystems, Volume 25, Issue 4, April 2024.
Abstract Sedimentary carbonates are known to be carried into the deep mantle by subducted slabs, and studies on mantle‐derived magmas have attempted to trace the recycled carbonate in their mantle source. However, the final depth of storage of recycled carbonate and the role of recycled carbonate in the partial melting of mantle remain controversial ...
Bowen Wei, Zhaochong Zhang, Zhiguo Cheng, Qiuhong Xie, M. Santosh, Weiliang Kong, Bingxiang Liu, Marc K. Reichow, Yingjie Li   +8 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