Results 81 to 90 of about 2,573 (214)
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 +2 more
doaj +1 more source
Use of ERTS imagery for natural resources research and development in Lesotho [PDF]
The author has identified the following significant results. As far as the geological aspects of the project were concerned, the project was a success.
Jackson, A. A., Nixon, P. H.
core +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 +6 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 +3 more
doaj +1 more source
Research in volcanic geology, petrology and planetary science at MIT, 1969 to 1974 [PDF]
The behavior of volcanoes was studied by geologic mapping, petrologic investigations of lava and xenoliths, physical measurements, and theoretical modelling. Field observations were conducted in Alaska (Nunivak Island), Iceland, Hawaii (Mauna Kea), Italy
Mcgetchin, T. R.
core +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 +8 more
wiley +1 more source
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 +3 more
doaj +1 more source
The effect of temperature and pressure on the distribution of iron group elements between metal and olivine phases in the process of differentiation of protoplanetary material [PDF]
The distribution patterns of Ni, Co, Mn, and Cr were studied in olivines of various origins: from meteorites (chondrites, achondrites, pallasites), which are likely analogs of the protoplanetary material, to peridotite inclusions in kimberlite pipes ...
Ilyin, N. P. +2 more
core +1 more source
Geochemistry, Geophysics, Geosystems, Volume 25, Issue 1, January 2024.Abstract The Northern Tanzanian Divergence in the East Africa Rift is arguably the best place on Earth to study the controls on rifting of thick lithosphere. Here, where the East Africa Rift intersects the Tanzanian Craton and the Mozambique Belt, the relationships between volcanism, faulting, pre‐existing structures and lithospheric thickness and ...
Sinan Özaydın +6 more
wiley +1 more source
Геодинамика и тектонофизикаThe 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 +5 more
doaj +1 more source