Results 51 to 60 of about 382 (174)
CRUSTAL CARBONATITES: DEFINITION, GEOLOGY, MINERALOGY, AND GEOCHEMISTRY
Геодинамика и тектонофизикаThis is a synopsis of the available data on crustal carbonatites, including their temporal and spatial distribution, mineralogy, geochemistry, and stable isotope (δ18O and δ13C) patterns.
E. V. Sklyarov, A. V. Lavrenchuk
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Geochemistry, Geophysics, Geosystems, Volume 27, Issue 6, June 2026.Abstract The cratonic lithospheric mantle records complex metasomatic processes and is frequently tapped by alkaline magmatism, offering a unique opportunity to trace the progressive evolution of the mantle. In the present contribution, we investigate a newly identified calc‐alkaline lamprophyre field from the Neoarchean Jonnagiri Schist Belt, Eastern ...
Sourav Naskar +6 more
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Carbonatite Melts and Electrical Conductivity in the Asthenosphere [PDF]
Science, 2008 Electrically conductive regions in Earth's mantle have been interpreted to reflect the presence of either silicate melt or water dissolved in olivine. On the basis of laboratory measurements, we show that molten carbonates have electrical conductivities that are three orders of magnitude higher than those of molten silicate and five orders of magnitude
Gaillard, Fabrice +4 more
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Archaeometry, Volume 68, Issue S3, Page S8-S30, June 2026.Abstract The use of stone hammers to produce sharp stone flakes—knapping—is thought to represent a significant stage in hominin technological evolution because it facilitated the exploitation of novel resources, including meat obtained from medium‐to‐large‐sized vertebrates. The invention of knapping may have occurred via an additive (i.e., cumulative)
Metin I. Eren +23 more
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MICA COMPOSITION REFLECTING CONDITIONS OF AILLIKITE FORMATION IN ZIMA COMPLEX OF EASTERN SIBERIA
Геодинамика и тектонофизикаFour types of mica were identified in the macrocryst and fine porphyry aillikites from the Yarma zone of the Urik-Ija graben considering specific features of morphology, chemical composition, zonation and crystallization conditions.
V. B. Savelyeva +4 more
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Plumes - a new word in Geology of the Urals
Литосфера, 2018 Subject. The ideas of plume tectonics became active and developing only several years later than the theory of plate tectonics. But in the Urals, the question of plume tectonics, contrary to plate tectonics, was not raised, with rare exceptions, until ...
Victor N Puchkov
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Problems of search and diagnosis of carbonatites on the territory of Ukraine
Вісник Харківського національного університету імені В.Н. Каразіна. Серія Геологія. Географія. ЕкологіяReliably established carbonatites on the territory of Ukraine have characteristics inherent in this class of rocks, in particular, they are enriched with a fairly wide range of rare chemical elements, the most characteristic are rare earth elements and ...
Василь Загнітко
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Geosciences, 2018 This article is devoted to the geology of titanium-rich varieties of the Petyayan-Vara rare-earth dolomitic carbonatites in Vuoriyarvi, Northwest Russia. Analogues of these varieties are present in many carbonatite complexes. The aim of this study was to
Evgeniy Kozlov +3 more
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NEW DATA ON PYROCHLORE FROM THE TATARKA DEPOSIT (YENISEI RIDGE, RUSSIA) [PDF]
Минералогия, 2017 Large pyrochlore crystals (up to 6 cm) from ores of the Tatarka deposit are studied, as well as their compositional zoning and relations with associated minerals.
V.I. Popova +8 more
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Anais da Academia Brasileira de Ciências, 2001 The Araxá complex (16 km²) comprises carbonatites forming a central core and a complex network of concentric and radial dykes as well as small veins; additionally, it includes mica-rich rocks, phoscorites and lamprophyres.
GIANBOSCO TRAVERSA +7 more
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