Results 31 to 40 of about 5,323 (197)

Synthetic Carbonatite Magma [PDF]

Nature, 1959
Judging from the literature during the past decade, there is a growing interest in problems related to the genesis of carbonatites and associated alkaline igneous rocks. The interest has undoubtedly been fostered by the discovery of large reserves of rare earths in these rocks.
Wyllie, P. J., Tuttle, O. F.
openaire   +2 more sources

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

The origin of secondary heavy rare earth element enrichment in carbonatites: Constraints from the evolution of the Huanglongpu district, China [PDF]

, 2018
publisher: Elsevier articletitle: The origin of secondary heavy rare earth element enrichment in carbonatites: Constraints from the evolution of the Huanglongpu district, China journaltitle: Lithos articlelink: http://dx.doi.org/10.1016/j.lithos.2018.02 ...
Brnicky, M, Cangeloosi, D, Chen, X, Jeffries, T, Kopriva, A, Kynicky, J, Smith, M, Spratt, J, Wenlei, S   +8 more
core   +3 more sources

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

High-temperature environments of human evolution in East Africa based on bond ordering in paleosol carbonates [PDF]

, 2010
Many important hominid-bearing fossil localities in East Africa are in regions that are extremely hot and dry. Although humans are well adapted to such conditions, it has been inferred that East African environments were cooler or more wooded during the ...
B. H. Passey, Bobe, Bramble, Eiler, F. H. Brown, Hernandez Fernandez, J. M. Eiler, McDougall, McDOUGALL, N. E. Levin, Royer, Sepulchre, T. E. Cerling, Wynn   +13 more
core   +2 more sources

Insight into differentiation in alkalic systems: Nephelinite-carbonate-water experiments aimed at Ol Doinyo Lengai carbonatite genesis

Frontiers in Earth Science, 2022
Ol Doinyo Lengai (ODL, Tanzania, East African Rift) is the only known volcano currently erupting carbonatite on Earth with 30 yr. cycles alternating between quiescent carbonatite effusion and explosive, compositionally-zoned silicate eruptions.
Craig C. Lundstrom, Rick Hervig, Tobias P. Fischer, Mayandi Sivaguru, Leilei Yin, Zhenhao Zhou, Xiaobao Lin, Rodrigo Grossi-Diniz   +7 more
doaj   +1 more source

Carbonatite Melts and Electrical Conductivity in the Asthenosphere [PDF]

, 2008
International audienceElectrically conductive regions in Earth's mantle have been interpreted to reflect the presence of either silicate melt or water dissolved in olivine.
Gaillard, Fabrice, Iacono-Marziano, Giada, Malki, Mohammed, Pichavant, Michel, Scaillet, Bruno   +4 more
core   +2 more sources

RELATION BETWEEN δ¹³С, δ¹⁸О AND REE CONTENT IN CARBONATITES OF THE TOMTOR COMPLEX, SAKHA REPUBLIC (YAKUTIA)

Геодинамика и тектонофизика
The paper reports the comprehensive study of phosphorus-rare metal (polymineral) carbonatites (I) and rare metal (ankerite) carbonatites (II) of the Tomtor massif based on ICP-MS, XRF, XRF-SI, SEM methods and isotope determination of C, O and 86Sr/87Sr ...
V. A. Ponomarchuk, E. V. Lazareva, S. M. Zhmodik, A. V. Travin, A. V. Tolstov   +4 more
doaj   +1 more source

Subsolidus processes in the Longonjo and Bailundo carbonatites (Angola) [PDF]

, 2012
Peer ReviewedPostprint (published ...
Alfonso Abella, María Pura, Bambi, Aurora Cuaiela João Mateus, Castellano Calvo, Amaia, Gonçalves, Antonio Olimpio, Melgarejo Draper, Joan Carles   +4 more
core  

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