Carbonatites from the Southern Brazilian platform: I
Open Geosciences, 2020 We present a comprehensive overview of the geochemical characteristics and evolution of the carbonatites from the southern Brazilian Platform (Paraná Basin).
Speziale Sergio +5 more
doaj +1 more source
BENARD CELLS – A POSSIBLE MECHANISM OF THE FORMATION OF SUBAQUATIC AND SUBFLUIDIC STALACTITES [PDF]
Минералогия, 2023 The mechanism of formation of stalactites in gravity field of the Earth during their formation in air and subaquatic and subfluidic (magmatic) systems is considered.
V.A. Popov, M.V. Tsyganko
doaj +1 more source
Carbonatite shows on the quartz deposits “Vein 175” (Ufalei block, the Southern Urals)
Литосфера, 2017 The subject of the study are manifestations of carbonatites in the quartz deposit “Vein № 175” - the largest deposit of granular quartz of Ufalei block in the Southern Urals.
Larisa Y. Kabanova +3 more
doaj +1 more source
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
doaj +1 more source
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
doaj +1 more source
A UNIQUE ORE LOCALITY OF POLYAKOVITE-(Ce) IN THE ILMENY MOUNTAINS, SOUTH URALS – NEW FINDS [PDF]
Минералогия, 2020 A large crystal of the rarest mineral polyakovite was discovered in 2019 in the carbonatitespegmatites of pit № 97 of the Ilmeny Mountains. Bodies of carbonatites, glimmerites, glimmeritespegmatites and carbonatite-pegmatites are located within a small ...
V.A. Popov +2 more
doaj +1 more source
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
doaj +1 more source
Геодинамика и тектонофизика, 2022 The Burpala massif located in the Northern Baikal region contains ore-bearing pegmatites, carbonatites and apatite-fluorite rocks with Zr-Nb-REE-rare-metal mineralization.
I. A. Sotnikova +2 more
doaj +1 more source
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
doaj +1 more source
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
doaj +1 more source