Results 61 to 70 of about 189 (171)

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

Specific Internal Structure of Diamonds from Zarnitsa Kimberlite Pipe

Crystals, 2017
The Zarnitsa kimberlite pipe is one of the largest pipes of the Yakutian diamondiferous province. Currently, some limited published data exists on the diamonds from this deposit.
Alexey Ragozin, Dmitry Zedgenizov, Konstantin Kuper, Yuri Palyanov   +3 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

Effect of HPHT Treatment on Spectroscopic Features of Natural Type Ib-IaA Diamonds Containing Y Centers

Crystals, 2020
In this paper, we report a spectroscopic study of natural type Ib-IaA diamonds containing Y centers subjected to high-pressure high-temperature treatment at 7–7.5 GPa and 1700–2200 °C.
Igor N. Kupriyanov, Yuri N. Palyanov, Alexander A. Kalinin, Vladislav S. Shatsky   +3 more
doaj   +1 more source

The Deep Structure of the Kimberlite Pipe Volchya in the Arkhangelsk Diamond Province and Controlling Faults Based on Passive Seismic and Radiological Methods (Northwest Russia)

Applied Sciences
The successful prospecting of kimberlite pipes is dependent upon a comprehensive understanding of the deep structures of the pipes and the host geological formation. This is a challenging task, given the complex nature of diamond deposits, the small size
Konstantin Danilov, Evgeny Yakovlev, Andrey Puchkov, Vladimir Bykov, Alexander Katorin   +4 more
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

Brines in deep horizons of the Udachnaya kimberlite pipe

Geodynamics & Tectonophysics, 2018
The study was focused on groundwaters sampled from boreholes drilled to deep horizons of the Udachnaya kimberlite pipe and the host sedimentary strata. Brines in the rocks significantly complicate underground mining. Analysis of the hydrogeological setting is required to ensure safety during mining to the design levels.
S. V. Alekseev, L. P. Alekseeva, A. S. Gladkov, N. S. Trifonov, E. V. Serebryakov, S. S. Pavlov, A. V. Il’in   +6 more
openaire   +3 more sources

MANTLE TERRANES OF THE SIBERIAN CRATON: THEIR INTERACTION WITH PLUME MELTS BASED ON THERMOBAROMETRY AND GEOCHEMISTRY OF MANTLE XENOCRYSTS

Геодинамика и тектонофизика, 2019
We have studied variations in the structure and composition of minerals from the pipes of the Yakutian kimberlite province (YKP) in different mantle terranes of the Siberian craton.
I. V. Ashchepkov, A. S. Ivanov, S. I. Kostrovitsky, M. A. Vavilov, S. A. Babushkina, N. V. Vladykin, N. S. Tychkov, N. S. Medvedev   +7 more
doaj   +1 more source