Results 81 to 90 of about 5,424 (219)

Petrography and mineral chemistry of carbonatites and mica-rich rocks from the Araxá complex (Alto Paranaíba Province, Brazil)

Anais da Academia Brasileira de Ciências, 2001
The Araxá complex (16 km²) comprises carbonatites forming a central core and a complex network of concentric and radial dykes as well as small veins; additionally, it includes mica-rich rocks, phoscorites and lamprophyres.
GIANBOSCO TRAVERSA, CELSO B. GOMES, PIERO BROTZU, NICOLETTA BURAGLINI, LUCIO MORBIDELLI, MARIA SPERANZA PRINCIPATO, SARA RONCA, EXCELSO RUBERTI   +7 more
doaj   +1 more source

Rb-Sr, Sm-Nd ages of the Phalaborwa Carbonatite Complex, South Africa [PDF]

, 2005
We analyzed Rb-Sr and Sm-Nd isotopic compositions of whole-rock and minerals from syenite, biotite gneiss xenolith, dolerite dyke, phoscorite, and carbonatite from the Phalaborwa Carbonatite Complex located in northeastern Transvaal, South Africa ...
Hiroo Kagami, Masaki Yuhara, Naoko Nishi, Yuka Hirahara   +3 more
core   +1 more source

Melts and fluids evolution in the process of crust and mantle formation in Paleo-Proterozoic (2,2—1,75 Ga ago). Stratigraphy and magnetic activity

Геофизический журнал, 2017
Stratigraphy of metamorphic Precambrian complexes related to Paleo-Proterozoic is controversial. An additional sign permitting to correlate strata may be their material composition because in the Precambrian composition of deep fluids changed regularly.
O. V. Usenko
doaj   +1 more source

MINERALOGY AND ZIRCON AGE OF CARBONATITES OF THE SREDNYAYA ZIMA COMPLEX (EASTERN SAYAN)

Геодинамика и тектонофизика
The Srednyaya Zima alkaline-ultramafic carbonatite complex is located in the Eastern Sayan and is a part of the area of manifestation of Neoproterozoic rare-metal alkaline-carbonatite magmatism along the southern and southeastern margins of the Siberian ...
I. R. Prokopyev, A. G. Doroshkevich, M. D. Varchenko, D. V. Semenova, I. A. Izbrodin, M. N. Kruk   +5 more
doaj   +1 more source

Introduction to a Resources Special Issue on Criticality of the Rare Earth Elements: Current and Future Sources and Recycling

, 2018
The rare earth elements (REE) are vital to modern technologies and society and are amongst the most important of the critical elements. This special issue of Resources examines a number of facets of these critical elements, current and future sources of ...
Jowitt, Simon M.
core   +2 more sources

Research and development for the Rare Earth Element supply chain in Europe. [PDF]

, 2017
This brochure is a product of the EURARE project, which was funded by the European Commission’s Seventh framework Programme to provide the basis upon which Europe could develop a secure supply of the rare earth elements (REE).
Deady, Eimear, Goodenough, Kathryn, Shaw, Richard   +2 more
core  

Element Partitioning between Immiscible Carbonatite and Silicate Melts for Dry and H2O-bearing Systems at 1-3 GPa [PDF]

, 2017
Carbonatite and silicate rocks occurring within a single magmatic complex may originate through liquid immiscibility. We thus experimentally determined carbonatite/silicate melt partition coefficients (Dcarbonate melt/silicate melt, hereafter D) for 45 ...
Guenther, Detlef, Martin, Lukas H. J., Mattsson, Hannes B., Schmidt, Max W.   +3 more
core  

Transition from carbonatitic magmas to hydrothermal brines: Continuous dilution or fluid exsolution? [PDF]

Sci Adv, 2023
Yuan X, Zhong R, Xiong X, Gao J, Ma Y.
europepmc   +1 more source

Alkaline magmatism and REE resources: a European overview, and links to Canada [PDF]

, 2014
In recent years, the European Union (EU) has prioritised the issue of critical raw materialsa – those materials which are important for the economy, but have risks to their supply.
Deady, Eimear, Finch, Adrian, Goodenough, Kathryn, Lusty, Paul, Shaw, Richard, Wall, Frances   +5 more
core  

Reply to: Silica is unlikely to be soluble in upper crustal carbonatite melts. [PDF]

Nat Commun, 2023
Berndt J, Klemme S.
europepmc   +1 more source