Results 21 to 30 of about 12,430 (216)

A comparison between in situ monazite Lu–Hf and U–Pb geochronology [PDF]

Geochronology
In complex metamorphic rocks, monazite U–Pb dates can span a wide concordant range, leading to ambiguous geological interpretations (e.g. slow protracted cooling versus multiphase growth).
A. T. De Vries Van Leeuwen, A. T. De Vries Van Leeuwen, A. T. De Vries Van Leeuwen, S. Glorie, S. Glorie, M. Hand, M. Hand, J. Mulder, S. E. Gilbert   +8 more
doaj   +1 more source

U-Pb Isotopic Dating of Monazite in Granite from the Changjiang Uranium Orefield, Northern Guangdong Province and Its Geological Significance

Yankuang ceshi, 2022
BACKGROUND The Changjiang uranium ore field in the southern margin of the Zhuguangshan complex pluton is a typical granite-type uranium ore field in China. Zircon U-Pb dating has been used to date ore-bearing granites. However, due to the high content of
CHEN Yan, PAN Jia-yong, ZHONG Fu-jun, WAN Jian-jun, YAN Jie, LIU Wen-quan, LI Hai-dong   +6 more
doaj   +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

REE-bearing minerals in Drava river sediments, Slovenia, and their potential origin

Geologija, 2017
Monazite and xenotime are major ore minerals for rare earth elements (REE), Y, and actinides, a powerful tool for radiometric dating and indicators of the geological genesis of the parent rock.
Aleš Šoster, Janez Zavašnik, Mihael Ravnjak, Uroš Herlec   +3 more
doaj   +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

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

Constraining deformation phases in the Aar Massif and the Gotthard Nappe (Switzerland) using Th Pb crystallization ages of fissure monazite-(Ce) [PDF]

, 2019
Fissure monazite-(Ce) (hereafter called monazite) commonly crystallizes during deformation at low metamorphic grade and offers the possibility to date protracted deformation over several millions of years and to identify distinct deformation phases.
M.J. Whitehouse, E. Gnos, Gnos, Edwin, C.A. Bergemann, Bergemann, Christian, Berger, Alfons, Rubatto, Daniela, A. Berger, D. Rubatto, E. Ricchi, Whitehouse, Martin, Ricchi, Emmanuelle   +11 more
core   +3 more sources

Radiological assessment of different monazite grades after mechanical separation from black sand

Scientific Reports, 2023
In Egyptian black sands, monazite is a precious mineral characterized by its composition, which includes crucial constituents such as thorium, trace amounts of uranium, and rare earth elements. It is essential to evaluate and quantify the extent of gamma-
N. A. kotb, M. S. Abd El Ghany, Ashraf A. El-sayed   +2 more
doaj   +1 more source

Supplemental Material: Evaluating preservation bias in the continental growth record against the monazite archive

, 2021
Table S1 (global compilation of monazite ages); Table S2 (compilation of whole rock geochemistry of monazite-bearing rocks); data sources for the zircon ages from the Himalayan orogen and Figure S1 (comparison of monazite and zircon age histograms and ...
Jack Mulder (10288622), Peter A. Cawood (8586732)   +1 more
core   +1 more source

Phase Decomposition upon Alteration of Radiation-Damaged Monazite–(Ce) from Moss, Østfold, Norway

CHIMIA, 2010
The internal textures of crystals of moderately radiation-damaged monazite–(Ce) from Moss, Norway, indicate heavy, secondary chemical alteration.
Lutz Nasdala, Katja Ruschel, Dieter Rhede, Richard Wirth, Ljuba Kerschhofer-Wallner, Allen K. Kennedy, Peter D. Kinny, Friedrich Finger, Nora Groschopf   +8 more
doaj   +1 more source