Results 21 to 30 of about 5,323 (197)

Petrogenesis of Eocene Tamazert continental carbonatites (Central High Atlas, Morocco): implications for a common source for the Tamazert and Canary and Cape Verde Island carbonatites [PDF]

, 2010
The Tamazert Eocene alkaline complex of the Central High Atlas Range of Morocco hosts the largest outcropping occurrences of carbonatites in northern Africa.
A. Kchit, A. Klugel, ANOVITZ, BAILEY, Coulson, D. Lowry, Duggen, F. Hauff, G. Beaudoin, Gomez, K. Hoernle, Keppler, Lentz, M. Bouabdellah, Oyarzun, S. Duggen, Salvi, Smith, WAGNER, Zindler   +19 more
core   +1 more source

Fenites associated with carbonatite complexes : a review [PDF]

, 2017
This is the author accepted manuscript. The final version is available from Elsevier via the DOI in this record.Carbonatites and alkaline-silicate rocks are the most important sources of rare earth elements (REE) and niobium (Nb), both of which are ...
A.A. Finch, A.R. Chakhmouradian, Afanasyev, Al Ani, Al Ani, Andersen, Andersen, Andersen, Appleyard, Arzamastev, Arzamastsev, Bailey, Bardina, Bazhenov, Bazhenov, Becke, Bodeving, Borst, Bowden, Brady, British Geological Survey, Broom-Fendley, Brögger, Burnham, Burnham, Bussell, Bühn, Bühn, Bühn, Carmichael, Cartwright, Castor, Chakhmouradian, Chakhmouradian, Chakhmouradian, Clarke, Cooper, Currie, Dahlgren, Deans, Dominy, Doroshkevich, Dowman, Drüppel, E. Deady, E. Dowman, Elliott, Engell, Es’kova, Evdokimov, F. Wall, Ferguson, Fettes, Finch, Fitton, Garson, Garson, Giehl, Giehl, Goodenough, Gorstka, Grant, Graser, Gresens, Gupta, H.A.L. Elliott, Haas, Haggerty, Harlov, Harlov, Harmer, Harmer, Hedenquist, Heinrich, Heinrich, Heinrich, Hogarth, Hogarth, Hogarth, Hornig-Kjarsgaard, Jackson, Johnson, Jones, Kelemen, Khamrabayev, King, Kjarsgaard, Kogarko, Kogarko, Konnerup-Madsen, Korzhinskii, Kovalenko, Kozlov, Kramm, Kramm, Kramm, Kresten, Kresten, Kruger, Krumrei, Kusebauch, Kwak, Le Bas, Le Bas, Le Bas, Le Bas, Le Maitre, Leake, Leake, Lee, Linnen, M.A.W. Marks, Mariano, Marien, Markl, Markl, Marks, Marks, Marks, Martin, McKie, Meinert, Meinert, Migdisov, Mikhailova, Misra, Mitchell, Moore, Morogan, Morogan, Morogan, Morogan, Nedosekova, Newton, Ngwenya, Notholt, Nurlybaev, Ortoleva, O’Brien, P.R. Siegfried, Palmer, Pfaff, Pirajno, Pirajno, Platt, Prokopyev, Putnis, Ray, Reid, Robb, Robins, Rosatelli, Rubie, Rubie, S. Dahlgren, S. Weatherley, Sachau, Samson, Sarapää, Schilling, Sillitoe, Sindern, Skelton, Smith, Stemprok, Sutherland, Sutherland, Sutherland, Swinden, Sæther, Thompson, Tilley, Timofeev, Traversa, Treiman, Tsay, Tuttle, Ugryumov, Vartiainen, Verschure, Verwoerd, Viladkar, Viladkar, Viladkar, von Eckermann, Wall, Wall, Williams-Jones, Williams-Jones, Wimmenauer, Winter, Wood, Woolley, Woolley, Woolley, Woolley, Woolley, Woolley, Woolley, Woolley, Xie, Xu, Zaraiskii, Zharikov   +203 more
core   +6 more sources

On the age of pyrochlore carbonatites from the Ilmeno-Vishnevogorsky Alkaline Complex, the Southern Urals (insights from Rb-Sr and Sm-Nd isotopic data)

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, V. A. Koroteev, T. B. Bayanova, P. A. Serov, V. I. Popova, M. V. Chervyakovskaya   +5 more
doaj   +1 more source

Petrology and geochemistry of selected nepheline syenites from Malawi and their potential as alternative potash sources [PDF]

, 2020
The Sub Saharan Africa agricultural sector is one of the most disadvantaged regions, partly due to high fertiliser import costs from the northern hemisphere.
Chiwona, Annock, CORTES CARRILLO, JOAQUIN ALBERTO, Gaulton, Rachel, Manning, David   +3 more
core   +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

Rare Earth element distribution on the Fuerteventura Basal Complex (Canary Islands, Spain): a geochemical and mineralogical approach [PDF]

Solid Earth
The 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, I. Menéndez, L. Quevedo, L. Quevedo, J. Yepes, R. Casillas, A. Ahijado, J. Méndez-Ramos, J. Mangas   +8 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

GEOCHRONOLOGY OF THE CHADOBETS ALKALINE ULTRAMAFIC CARBONATITE COMPLEX (SIBERIAN CRATON): NEW U-Pb AND Ar-Ar DATA

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, A. G. Doroshkevich, A. V. Malyutina, A. E. Starikova, A. V. Ponomarchuk, D. V. Semenova, S. A. Kovalev, I. A. Savinsky   +7 more
doaj   +1 more source

Evidence for dissolution-reprecipitation of apatite and preferential LREE mobility in carbonatite-derived late-stage hydrothermal processes [PDF]

, 2016
The Tundulu and Kangankunde carbonatite complexes in the Chilwa Alkaline Province, Malawi, contain late-stage, apatite-rich lithologies termed quartz-apatite rocks.
Appleton, J. Don, Broom-Fendley, Sam, Gunn, Gus, Styles, Mike T., Wall, Frances   +4 more
core   +1 more source

Carbonatites of India [PDF]

Journal of the Geological Society of India, 2019
ABSTRACT Based on the field relations, associated rock types and age, the carbonatite-alkaline rock complexes of India, that are spatially related to deep main faults, rifts and shear zones, have been classified in to two major groups, namely: 1. Middle – late Cretaceous, subvolcanic – volcanic complexes (Amba Dongar, Siriwasan, Swangkre,
Anna Gennad’evna Doroshkevich, German Ripp, Shrinivas Viladkar   +2 more
openaire   +2 more sources