Results 31 to 40 of about 32,006 (319)

Occurrence of Rare Earth, Iron, Phosphorus and Calcium in High Grade Rare Earth Concentrate

Kuangchan zonghe liyong, 2022
Rare earth grade of Bayan Obo mixed rare earth concentrate is 65.86%, and the contents of P2O5, CaO and TFe are 11.26%, 3.89% and 1.34%, respectively. Chemical analysis, automatic mineral analysis system, SEM and EDS were used to study the occurrence of ...
Na Li, Yufang Qin, Hailong Jin, Qiwei Wang   +3 more
doaj   +1 more source

Quantitative elemental mapping of granulite‐facies monazite: Textural insights and implications for petrochronology

Journal of Metamorphic Geology, 2020
Texturally complex monazite grains contained in two granulite‐facies pelitic migmatites from southern Baffin Island, Arctic Canada, were mapped by laser ablation‐inductively coupled plasma‐mass spectrometry (using spot sizes ≤5 µm) to quantitatively ...

semanticscholar   +1 more source

Zircon ages in granulite facies rocks: decoupling from geochemistry above 850 °C? [PDF]

, 2018
Granulite facies rocks frequently show a large spread in their zircon ages, the interpretation of which raises questions: Has the isotopic system been disturbed? By what process(es) and conditions did the alteration occur?
A Boriani, A Boriani, A Henk, A Langone, A Mulch, A Mulch, A Möller, A Zanetti, A Zingg, A Zingg, A-M Seydoux-Guillaume, AE Hofmann, B Bingen, B Schnetger, Barbara E. Kunz, BE Kunz, BE Kunz, C Annen, C Paton, C Paton, C Redler, C Redler, C Yakymchuk, CR McFarlane, CR McFarlane, D Regis, D Rubatto, D Rubatto, D Rubatto, D Rubatto, D Rubatto, Daniele Regis, DE Kelsey, DE Kelsey, DJ Cherniak, DJ Cherniak, DM Fountain, DM Fountain, E Rutter, EB Watson, EB Watson, EM Peterman, F Corfu, F Tomaschek, FJ Korhonen, G Bigi, G Fraser, G Peressini, G Rivalenti, G Rivalenti, G Vavra, G Vavra, GL Luvizotto, H Berckhemer, H Degeling, H Voshage, IS Williams, IS Williams, J Hermann, J Pape, J Sláma, JA Baldwin, JA Petrus, JE Quick, JE Quick, JF Diener, JW Valley, K Mezger, KR Mehnert, L Nasdala, L Nasdala, L Schiøtte, M Bertolani, M Bertolani, M Guillong, M Kohn, M Tichomirowa, MA Kusiak, MA Kusiak, Martin Engi, MJ Whitehouse, MP Roberts, MR Handy, MR Handy, NE Timms, NE Timms, NJ Pearce, NM Kelly, P Monjoie, P Vonlanthen, PW Hoskin, PW Hoskin, PW Hoskin, R Schuster, RC Ewing, RJ Taylor, RM Flowers, RT Pidgeon, S Barboza, S Barboza, S Bodorkos, S Capedri, S Piazolo, S Sinigoi, S Sinigoi, S Sinigoi, SE Jackson, SH Vorhies, SL Harley, SM Reddy, SM Schmid, SM Schmid, T Geisler, T Geisler, TA Ewing, U Schaltegger, U Schaltegger, U Schaltegger, U Schaltegger, US Klötzli, WF McDonough   +120 more
core   +1 more source

Separation, reserve estimation and radioactivity responsibility of the economic heavy minerals of East El- Arish black sand, North Sinai, Egypt

Scientific Reports, 2023
Multi-heavy mineral separation techniques like density, magnetic, and electromagnetic techniques are followed by picking, grain counting, and mineralogical examinations conducted with an environmental scanning electron microscope (ESEM). These techniques
M. Awad, A. M. El Mezayen, S. M. El Alfi, H. H. Ali, M. I. Sayyed, M. Y. Hanfi   +5 more
doaj   +1 more source

Geochemical Discrimination of Monazite Source Rock Based on Machine Learning Techniques and Multinomial Logistic Regression Analysis

, 2020
Detrital monazite geochronology has been used in provenance studies. However, there are complexities in the interpretation of age spectra due to their wide occurrence in both igneous and metamorphic rocks. We use the multinomial logistic regression (MLR)
K. Itano, K. Ueki, T. Iizuka, T. Kuwatani   +3 more
semanticscholar   +1 more source

The absence of metamictisation in natural monazite

Scientific Reports, 2020
The actinide-containing mineral monazite–(Ce) is a common accessory rock component that bears petrogenetic information, is widely used in geochronology and thermochronology, and is considered as potential host material for immobilisation of radioactive ...
L. Nasdala, S. Akhmadaliev, B. Burakov, C. Chanmuang N., R. Škoda   +4 more
semanticscholar   +1 more source

Speculations Linking Monazite Compositions to Origin: Llallagua Tin Ore Deposit (Bolivia)

Resources, 2017
Monazite [(Ce,Th)PO4] from the Llallagua tin ore deposit in Bolivia is characterized by low radiogenic element contents. Previously reported field evidence and mineral associations suggest the mineral formed via direct precipitation from hydrothermal ...
Elizabeth J. Catlos, Nathan R. Miller
doaj   +1 more source

Monazite transformation into Ce- and La-containing oxalates by Aspergillus niger.

Environmental Microbiology, 2020
Monazite is a naturally-occurring lanthanide (Ln) phosphate mineral [Lnx (PO4 )y ] and is the main industrial source of the rare earth elements (REE), cerium and lanthanum.
Xia Kang, L. Csetenyi, G. Gadd
semanticscholar   +1 more source

Plate tectonics: When ancient continents collide [PDF]

, 2017
The geological record preserves scant evidence for early plate tectonics. Analysis of eclogites — metamorphic rocks formed in subduction zones — in the Trans-Hudson mountain belt suggests modern-style subduction may have operated 1,800 million years ...
Clare Warren, J Hermann, M Brown, OM Weller, R Caby   +4 more
core   +1 more source

Economic evaluation of thorium oxide production from monazite using alkaline fusion method

Nuclear Engineering and Technology, 2021
Monazite is a phosphate mineral that contains thorium (Th) and rare earth elements. The Th concentration in monazite can be as high as 500 ppm, and it has the potential to be used as fuel in the nuclear power system.
Sanjith Udayakumar, Norlia Baharun, Sheikh Abdul Rezan, Aznan Fazli Ismail, Khaironie Mohamed Takip   +4 more
doaj   +1 more source