Results 81 to 90 of about 2,650 (213)

REE mineralization in the Bayan Obo deposit, China: Evidence from mineral paragenesis

Ore Geology Reviews, 2017
Abstract Preliminary mineralogical and geochemical studies have been carried out on dolomite marble drill cores from the Bayan Obo REE deposit in China. Three types of apatites and four types of monazites have been identified based on textural features: Type 1 apatite occurs as grains with minor monazite (Type 1 monazite) on its border; Type 2 ...
Miao Deng, Cheng Xu, Wenlei Song, Haiyan Tang, Yun Liu, Qiang Zhang, Yue Zhou, Meng Feng, Chunwan Wei   +8 more
openaire   +2 more sources

The Influence of Basaltic Islands on the Oceanic REE Distribution: A Case Study From the Tropical South Pacific

Frontiers in Marine Science, 2018
The Rare Earth Elements (REEs) have been widely used to investigate marine biogeochemical processes as well as the sources and mixing of water masses. However, there are still important uncertainties about the global aqueous REE cycle with respect to the
Mario Molina-Kescher, Ed C. Hathorne, Anne H. Osborne, Melanie K. Behrens, Martin Kölling, Katharina Pahnke, Martin Frank   +6 more
doaj   +1 more source

Development of Arsenopyrite Reference Materials (Sacra and Niko) for In situ Multiple Sulfur Isotope Measurement

Geostandards and Geoanalytical Research, EarlyView.
Key Points New arsenopyrite reference materials (Niko and Sacra) for in situ multiple sulfur isotope measurement. Niko and Sacra are homogenous, near‐stoichiometric arsenopyrite. Niko serves as a primary matrix‐matched reference material, with lower measurement repeatability; Sacra is recommended as a secondary reference and quality control material ...
Bruna Coldebella, Guillaume Barré, Crystal LaFlamme, Laure Martin, Pierre Cartigny   +4 more
wiley   +1 more source

REE Spatial Distribution and Mineral Association in Coal and Mudstone: Implications for REE Enrichment Mechanisms

Rare earth elements (REE) are crucial components of billions of products worldwide. Transitioning from foreign to domestic REE sources requires utilizing both primary (i.e., carbonatites, alkaline igneous rocks, pegmatites, skarn deposits) and secondary (unconventional) sources (i.e., ion adsorption clays, placer deposits, weathered rock, black and/or ...
Laura Wilcock, Lauren P. Birgenheier, Emma A. Morris, Peyton D. Fausett, Haley H. Coe, Diego P. Fernandez, Ryan D. Gall, Michael D. Vanden Berg   +7 more
openaire   +1 more source

Quantification of Sulfur Speciation in Apatites: Comparison of the XAS, XPS and EPMA Techniques

Geostandards and Geoanalytical Research, EarlyView.
Key Points Sulfur speciation in apatites has been determined by S K‐edge X‐ray absorption near‐edge structure (XANES) spectroscopy, S 2p X‐ray photoelectron spectroscopy (XPS) and electron probe microanalysis (EPMA). XANES provides the most sensitive and accurate quantification of sulfur speciation.
Yuzhou Feng, Yuanming Pan, Leo Ka Long Cheung, Reza Deevsalar, Jason Maley, Huayong Chen, Haoran Dou, Mohsen Shakouri, Qunfeng Xiao   +8 more
wiley   +1 more source

Revitalization Treatment in Endodontics: A State‐Of‐The‐Art Review

International Endodontic Journal, EarlyView.
ABSTRACT Ten years after the European Society of Endodontology (ESE) issued its inaugural Position Statement in 2016, revitalization (BrE: revitalisation) treatment has progressed from an experimental approach to a cornerstone of contemporary endodontic practice.
M. Widbiller, X. Petridis, G. Krastl, N. Meschi, J. Camilleri, H. F. Duncan, M. T. Arias‐Moliz, J. G. Leprince, G. Van Gorp, M. Arnold, K. M. Galler, S. Simon, B. Kahler   +12 more
wiley   +1 more source

Metamorphic or Igneous Zircon? Classification Through Rare Earth Elements, Machine Learning and Logistic Regression

Journal of Metamorphic Geology, EarlyView.
ABSTRACT Zircon is a common, highly refractory accessory mineral found in sedimentary, igneous and metamorphic rocks that forms through various processes (e.g., magmatic, hydrothermal, metamorphic growth and recrystallization). Trace element compositions of detrital zircon have been widely applied to understanding tectonic processes and continental ...
Jarrod M. Burges, Chris Yakymchuk, Michael P. DiMaio, Timothy C. C. Lui, Anirudh Prabhu, Shaunna M. Morrison   +5 more
wiley   +1 more source

A Microkrystite from the Australasian Tektite/Microtektite Strewn Field

Meteoritics &Planetary Science, EarlyView.
Abstract Microkrystites are glassy impact spherules. They contain primary crystallites carrying information on the physical and chemical conditions prevailing during vaporization, melting, and ejection in large impact cratering events. We report on the geochemistry and mineralogy down to nanometer scale of the first microkrystite (ODP1144A,14) from the
Matteo Del Rio, Luigi Folco, Matteo Masotta, Ana Černok, Enrico Mugnaioli   +4 more
wiley   +1 more source

Thermal history, collisional history, and structure of the CK‐chondrite parent body

Meteoritics &Planetary Science, EarlyView.
Abstract Major chondrite groups (H, L, LL, R, EH, EL, CK) with some members of petrologic type 5 and 6 also have some members of types 3 and 4; they do not have members of type 1 or 2. Their parent bodies had onion‐shell structures and were internally heated by the decay of 26Al.
Alan E. Rubin
wiley   +1 more source

Extraction of REE from a Mineral Rich in Iron Oxides

EPISTEMUS: Ciencia, Tecnología y Salud, 2022
Rare earths (REE) have attracted the attention of the world due to its importance for its application in advanced technologies, which has generated the optimization and development of new processes for its recovery from mine tailings, metallurgical slags and phosphorous gypsum. Globally, REE are obtained mainly from carbonatites, alkaline igneous rocks,
Tamayo Soriano, Diego Alejandro, Martínez Luévanos, Antonia, Soria Aguilar, Ma. de Jesús, Carrillo Pedroza, Francisco Raúl   +3 more
openaire   +1 more source