Results 31 to 40 of about 2,685 (149)
MINERAL ASSEMBLAGES OF THE SHISHIM MINE IN THE SOUTHERN URALS [PDF]
Минералогия, 2023 Mineralogy and petrography of complex rocks in area of the Shishim mine in the South Urals is studied. Various skarn assemblages with dominant pyroxene, garnet, vesuvianite, monticellite, chlorite and epidote are developed after gabbroids and granitoids.
V.A. Popov, M.A. Rassomakhin
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Carbonatites: Classification, Sources, Evolution, and Emplacement
, 2022 Carbonatites are igneous rocks formed in the crust by fractional crystallization of carbonate-rich parental melts that are mostly mantle derived. They dominantly consist of carbonate minerals such as calcite, dolomite, and ankerite, as well as minor ...
Tappe, Sebastian +4 more
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Литосфера, 2020 Research subject. In this research, we carried out Sm-Nd- и Rb-Sr-dating of pyrochlore carbonatite from the Vishnevogorsky niobium deposit, Ilmeno-Vishnevogorsky Alkaline Complex, Southern Urals.
I. L. Nedosekova +5 more
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Rare Earth element distribution on the Fuerteventura Basal Complex (Canary Islands, Spain): a geochemical and mineralogical approach [PDF]
Solid EarthThe Fuerteventura Basal Complex comprises Oligocene and Miocene ultra-alkaline-carbonatitic magmatic pulses with outcrops that extend across kilometer-scale areas in some specific sectors of this oceanic island.
M. Campeny +8 more
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Petrology and geochemistry of a U and Th enriched nephelinite from Mt. Nyiragongo, Zaire: Its bearing on ancient mantle metasomatism [PDF]
Bulletin of the Geological Society of Finland, 1985 Unusual large Pb isotope variations found by Vollmer and Norry (1983 a) in nephelinites from Nyiragongo and related volcanoes date a 500 Myr old U(Th)/Pb fractionation.
R. Vollmer, P.H. Nixon, E. Condliffe
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Ore specialization of carbonatite complexes at the Urais and Timan
Литосфера, 2017 The ore specialization of carbonatite complexes of Urals-Timan region has been established: niobium and rare earth-niobium - for the Urals’ carbonatite complexes, the rare-earth - for carbonatites of Timan.
I. L. Nedosekova +2 more
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Fluids in the Siilinjärvi carbonatite complex, eastern Finland: Fluid inclusion evidence for the formation conditions of zircon and apatite [PDF]
Bulletin of the Geological Society of Finland, 1995 In the studied zircon and apatite crystals, data recorded two different compositional types of fluid inclusions: Type 1 H2O-CO2 low salinity inclusions (XCO2 = 0.42 to 0.87; XNaCl = 0.001 to 0.005) with bulk densities of 0.73 to 0.87 g/cm3, and Type 2 ...
M. Poutiainen
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Dizhi lixue xuebao[ Objective ] Carbonatites, as magmatic-origin rocks, are crucial source rocks for uranium, rare earth, and other minerals. They are widely distributed in the Xiaoqinling region of Shaanxi, giving rise to numerous large to super-large carbonatite ...
KANG Qingqing +7 more
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Геодинамика и тектонофизика, 2021 The Chadobets alkaline ultramafic carbonatite complex is located on the Siberian craton within the southern boundary of the Permian-Triassic plume activity.
I. R. Prokopyev +7 more
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Carbonatites: contrasting, complex, and controversial
, 2021 Carbonatites are unique, enigmatic, and controversial rocks directly sourced from, or evolved from, mantle melts. Mineral proportions and chemical compositions of carbonatites are highly variable and depend on a wide range of processes: melt generation ...
Vadim Kamenetsky (14740705) +3 more
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