Results 21 to 30 of about 2,573 (214)

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

open access: yesГеодинамика 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   +2 more
doaj   +1 more source

Interaction between protokimberlite melts and mantle lithosphere: evidence from mantle xenoliths from the Dalnyaya kimberlite pipe, Yakutia (Russia) [PDF]

open access: yes, 2017
The Dalnyaya kimberlite pipe (Yakutia, Russia) contains mantle peridotite xenoliths (mostly lherzolites and harzburgites) that show both sheared porphyroclastic (deformed) and coarse granular textures, together with ilmenite and clinopyroxene megacrysts.
Afanasiev   +101 more
core   +2 more sources

Thermal history of diamond from Arkhangelskaya and Karpinsky-I kimberlite pipes

open access: yesЗаписки Горного института, 2022
This work studies and compares the main morphological, structural, and mineralogical features of 350 diamond crystals from the Karpinsky-I and 300 crystals of the Arkhangelskaya kimberlite pipes.
Evgeny A. Vasilev   +2 more
doaj   +1 more source

Sr, Nd, and Pb isotope evidence for a mantle origin of alkali chlorides and carbonates in the Udachnaya kimberlite, Siberia [PDF]

open access: yes, 2005
The kimberlite rocks of the Udachnaya-East pipe (Siberia) are uniquely fresh and contain very high abundances of primary volatiles (Cl, CO2, S). Alkali elements and chlorine are extremely abundant in the reconstructed kimberlite melt compositions, and ...
Kamenetsky, MB   +4 more
core   +1 more source

A crustal-upper-mantle model for the Colorado Plateau based on observations of crystalline rock fragments in the Moses Rock Dike [PDF]

open access: yes, 1972
On the basis of the size, the abundance, and the petrographic character of xenoliths in the Moses Rock dike, a model for the vertical stratigraphy of crystalline rocks beneath the dike is proposed extending from near the surface to a depth of about 200 ...
McGetchin, Thomas R., Silver, Leon T.
core   +1 more source

Internal vs. external forcing in shallow marine diatreme formation: a case study from the Iblean Mountains (SE-Siciliy, Central Mediterranean) [PDF]

open access: yes, 2009
A model of diatreme evolution in a shallow marine setting is based on a multi-disciplinary analysis of diatremes in the Iblean Mountains (Sicily). The approach includes stratigraphic, volcanological, structural, petrologic and compositional data.
Schmincke, Hans-Ulrich, Suiting, Ines
core   +1 more source

Oxide minerals of Kaavi kimberlites (Finland)

open access: yesИзвестия высших учебных заведений: Геология и разведка, 2019
The mineralogical and petrogeochemical features of the Neoproterozoic kimberlite rocks of the Lahtojoki and Niilonsuo pipes of the Kaavi cluster (Kaavi-Kuopio, Finland) have been studied, differences in their petrogeochemical composition, quantitative ...
N. S. Azarova   +4 more
doaj   +1 more source

Review of the spatial distribution of kimberlite pipes in the tectonic structures of the world

open access: yesGeo&Bio
Kimberlite pipes are vertical or inclined cylindrical or cone-shaped bodies filled with kimberlite, an ultramafic igneous rock. The diameter of kimberlite pipes can vary from a few metres to 1.5 km, and their depth reaches several kilometres.
Andrii Luniachek
doaj   +1 more source

STRUCTURAL-COMPOSITIONAL MODEL OF THE NYURBINSKAYA KIMBERLITE PIPE FORMATION (SREDNE-MARKHA AREA OF THE YAKUTIAN DIAMONDIFEROUS PROVINCE)

open access: yesГеодинамика и тектонофизика, 2016
The paper presents the results of comprehensive study of the primary diamond deposit of the Nyurbinskaya pipe in the Yakutian diamondiferous province. It is established, that the pipe is confined to the fault junction of four directions and is composed ...
A. S. Gladkov   +6 more
doaj   +1 more source

A contribution to aeromagnetic deculturing in populated areas [PDF]

open access: yes, 2016
Modern regional airborne magnetic data sets when acquired in populated areas are inevitably degraded by cultural interference. In the UK context, the spatial densities of interfering structures and their complex spatial form severely limit our ability to
Beamish, David
core   +1 more source

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