Results 51 to 60 of about 13,641 (263)

Six Ca‐Mg‐Fe Carbonate Reference Materials for In Situ Measurement of Oxygen and Carbon Isotope Ratios

Geostandards and Geoanalytical Research, EarlyView.
Key Points Six new Ca‐Mg‐Fe carbonate reference materials are available to the global geochemical community for calibrating oxygen and carbon isotope ratios by SIMS. Significant compositional matrix effects were observed in the dolomite‐ankerite and magnesite‐siderite series during SIMS analysis. Compositional matrix effects correlate with Fe variation.
Maria Rosa Scicchitano, Chris Harris, Julie Luyt, Andreas Pack, Tommaso di Rocco, Torsten Vennemann, Franziska D.H. Wilke, Anja M. Schleicher, Johannes Glodny, Kimberly T. Tait, Simon Philippo   +10 more
wiley   +1 more source

Near‐Synchronous Cambrian Evolution of the Transbrasiliano‐Kandi‐4°50′ Shear Zone in South America and Africa

Terra Nova, EarlyView.
ABSTRACT The Transbrasiliano‐Kandi‐4°50′ (TK4) shear zone in western Gondwana crosscuts South America and NW Africa for at least 6000 km. Despite its impressive size, the timing of the main episode of dextral ductile shearing is uncertain. We present detailed in situ multi‐mineral geochronology of mylonites from both Brazil and Algeria supporting that ...
F. A. Caxito, B. V. Ribeiro, F. Alkmim, A. Deramchi, C. L. Kirkland   +4 more
wiley   +1 more source

Spatial and temporal distribution, geochemical characteristics of carbonatites and their relationship with U–REE mineralization in the Xiaoqinling area, Shaanxi Province

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, CHEN Zhengle, PAN Jiayong, LI Peng, LIU Yulong, LI Lei, JIANG Hongjun, GAO Cheng   +7 more
doaj   +1 more source

Remote Sensing Exploration of Nb-Ta-LREE-Enriched Carbonatite (Epembe/Namibia)

Remote Sensing, 2016
On the example of the Epembe carbonatite-hosted Nb-Ta-LREE deposit, we demonstrate the use of hyperspectral reflectance data and geomorphic indicators for improving the accuracy of remote sensing exploration data of structurally-controlled critical raw ...
Robert Zimmermann, Melanie Brandmeier, Louis Andreani, Kombada Mhopjeni, Richard Gloaguen   +4 more
doaj   +1 more source

The composition of apatite in the Archean Siilinjärvi glimmerite-carbonatite complex in eastern Finland [PDF]

Bulletin of the Geological Society of Finland
We present a geochemical dataset and cathodoluminescence images of apatite from the Neoarchean (2610 Ma) glimmerite-carbonatite rocks from the Siilinjärvi complex, Eastern Finland. The subhedral, tapered prismatic grains are compositionally fluorapatite,
Seppo Karvinen, Aku Heinonen, Christoph Beier, Niels Jöns   +3 more
doaj   +1 more source

The Petyayan-Vara Carbonatite-Hosted Rare Earth Deposit (Vuoriyarvi, NW Russia): Mineralogy and Geochemistry

, 2020
The Vuoriyarvi Devonian carbonatite–ijolite–pyroxenite–olivinite complex comprises several carbonatite fields: Neske Vara, Tukhta-Vara, and Petyayan-Vara. The most common carbonatites in the Tukhta-Vara and Neske-Vara fields are calciocarbonatites, which
E. Kozlov, E. Fomina, Mikhail Sidorov, V. Shilovskikh, V. Bocharov, A. Chernyavsky, M. Huber   +6 more
semanticscholar   +1 more source

Aillikites and Alkali Ultramafic Lamprophyres of the Beloziminsky Alkaline Ultrabasic-Carbonatite Massif: Possible Origin and Relations with Ore Deposits

Minerals, 2020
The 650–621 Ma plume which impinged beneath the Siberian craton during the breakup of Rodinia caused the formation of several alkaline carbonatite massifs in craton margins of the Angara rift system.
I. Ashchepkov, S. Zhmodik, D. Belyanin, O. Kiseleva, N. Medvedev, A. Travin, D. Yudin, N. Karmanov, H. Downes   +8 more
semanticscholar   +1 more source

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, D. A. Zamyatin, O. V. Udoratina   +2 more
doaj   +2 more sources

MAGNETITE DEPOSITS OF THE TOMTOR (ONKUCHAKH AREA) AND KOVDOR PLUTONS: A PROBLEM OF ORE PRECARBONATITES [PDF]

Минералогия, 2018
The comparative characteristics of magnetite deposits of the Kovdor (camaphorite deposit) and Tomtor (Onkuchakh area) plutons, which were formed during the carbonatite stage of the formation of the plutons and can be classified «ore precarbonatites», is ...
A.V. Lapin, A.V. Tolstov, I.M. Kulikova, O.A. Nabelkin   +3 more
doaj  

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