Article
Metallurgy & Metallurgical Engineering
Sabrina Hedrich, Anja Breuker, Mirko Martin, Axel Schippers
Summary: Sands from the German Baltic Sea coast are recovered as construction material and contain heavy minerals enriched with zircon, garnet, ilmenite, rutile, magnetite, and monazite. Gravity and magnetic separation can be used to concentrate the heavy minerals. Bioleaching experiments were conducted on zircon concentrates and eudialyte concentrates containing rare earth elements (REE), but the results showed limitations in the extraction of REEs from heavy minerals through bioleaching.
Article
Geosciences, Multidisciplinary
Renata da Silva Schmitt, Renato Moraes, Rodrigo Vinagre, Thayla Almeida Teixeira Vieira, Julio Cezar Mendes, George Luiz Luvizotto, Raphaela Lopes de Andrade Silva, Silvia Regina de Medeiros
Summary: This paper presents petrochronological data on the structural and stratigraphic relations of Ediacaran basement and cover gneisses during the Ediacaran-Cambrian Btizios orogeny in southeastern Brazil. The data reveals distinct crustal levels and contrasting P-T-t paths during convergent tectonics. The findings suggest the existence of a low-angle subduction zone and present the highest recorded pressure in Ediacaran-Cambrian metamorphic rocks.
PRECAMBRIAN RESEARCH
(2022)
Article
Spectroscopy
Supriya Ughade, Pankaj Poddar
Summary: Rare earth chromates (RCrO4) undergo a structural phase transition from monazite to zircon-type due to the decrease in rare-earth ion size, and they also exhibit an intermediate mixed phase. However, there has been no systematic study on the influence of structural distortion on their phononic behavior, which is sensitive to environmental variations.
JOURNAL OF RAMAN SPECTROSCOPY
(2023)
Article
Physics, Particles & Fields
J. R. Nascimento, A. Yu. Petrov, P. J. Porfirio, Ramires N. da Silva
Summary: In this study, the consistency of spacetime homogeneous Godel-type metrics within f (R, Q, P) theories of gravity is examined for well-motivated matter sources. These geometries are known to allow for causality violation. General conditions are provided to generate completely causal solutions in a different manner from general relativity. Specific models, such as f (R, Q, P) = R - mu(4n+2/)(aR(2) +bQ +cP)(n), are presented to illustrate the general results. Interestingly, an unusual completely causal vacuum solution is also found in the presence of a nontrivial cosmological constant, corresponding to the case m(2) = 4 omega(2).
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Geology
Nasser Mourad Mahdy
Summary: The study discusses the main mineralization characteristics in the Wadi Al-Baroud area, where rare metal pegmatites are composed of feldspar, quartz, and mica. Zircon, monazite, and thorite are highlighted as potential monitors of the internal evolution of pegmatite and the granite-pegmatite system. Additionally, thorite in the pegmatite plays a crucial role in the evolution process of the granite-pegmatite system.
ORE GEOLOGY REVIEWS
(2021)
Article
Geosciences, Multidisciplinary
Yuhua Wang, Lingsen Zeng, Li-E Gao, Zhenyu Chen, Sanzhong Li
Summary: Knowledge of the earliest metamorphism in collisional orogenic belts, such as the Himalayan orogen, is crucial for understanding the tectonic processes and environmental consequences of building high mountain chains. In this study, garnet amphibolites from the Kangmar gneiss dome in the Himalayas were found to have undergone a phase of metamorphism, experiencing increased pressure and temperature. The heating of these rocks suggests compression and thickening, and the self-produced heat was sufficient to achieve the observed pressure-temperature conditions.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2022)
Article
Geosciences, Multidisciplinary
Han Wang, Xu-Ping Li, Juergen Reinhardt, Fan-Mei Kong, Hans-Peter Schertl, Guang-Ming Sun
Summary: The Bushmanland Domain in the western Namaqua-Natal Metamorphic Province includes Paleoproterozoic to Mesoproterozoic intrusives and metamorphosed volcano-sedimentary supracrustal rocks. High-grade metamorphism is prevalent, with evidence of peak conditions reaching transitional to ultrahigh temperatures. The zircon and monazite geochronology reveals two distinct age groups, indicating both an older metamorphic cycle predating the established 1040-1020 Ma Namaquan cycle, and a Late Mesoproterozoic group confirming the similar to 1040-1020 Ma metamorphic age associated with the Namaquan orogeny.
PRECAMBRIAN RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
A. M. Srivastava, M. G. Brik, W. W. Beers, W. Cohen
Summary: This study investigates the influence of transition metal cations with empty nd(0) cores on the optical properties of Eu3+ and the crystal field splitting. The results suggest that the strength of covalent bonding between the cations and oxide anions is responsible for the variations in properties. In isostructural compounds, covalent bonding within the crystal framework determines the asymmetry ratio and crystal field splitting.
Article
Geology
Joseph D'Souza, N. Prabhakar, Hetu Sheth, Yigang Xu
Summary: The Pur-Banera belt in northwestern India is a Mesoproterozoic rift-related supracrustal sequence dominated by garnet-staurolite-kyanite-bearing metapelites. Through data integration and analysis, it was found that the metapelites experienced three deformation events, with two stages of garnet growth and subsequent fluid-induced retrograde metamorphism. The combined results provide insights into the tectonometamorphic evolution of the Pur-Banera belt and its connection to the supercontinent Rodinia.
JOURNAL OF METAMORPHIC GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Jong Hyuk Jeon, Ana Belen Cueva Sola, Gyu Beom Park, Jin-Young Lee, Hong-in Kim, Rajesh Kumar Jyothi
Summary: Systematic studies were conducted to extract rare earths and recover thorium from Korean monazite. The acid baking process was used to transform rare earth elements (REEs) and thorium phosphates into water-soluble sulfates, followed by water leaching. Thorium was separated from the leach liquor using primary amine Primene JM-T, while rare earth elements were separated through solvent extraction technique using Cyanex 572. The study demonstrated effective methods for the extraction and separation of rare earths and thorium from monazite.
GEOSYSTEM ENGINEERING
(2022)
Article
Geology
Novita Sari Fatihah, Mutia Anggraini, Afiq Azfar Pratama, Kurnia Setiawan Widana
Summary: The study found that uranium, thorium, and rare earth elements can be dissolved optimally at pH 1, 80 degrees Celsius, and 2 hours, and then separated under precipitation conditions at pH 6. This indicates the potential for efficient recovery and separation of these elements in monazite processing.
EKSPLORIUM-BULETIN PUSAT TEKNOLOGI BAHAN GALIAN NUKLIR
(2021)
Article
Geosciences, Multidisciplinary
Hua-wen Cao, Qiu-ming Pei, Xiao Yu, Yong Chen, Hang Liu, Kai Zhang, Xin Liu, Xiang-fei Zhang
Summary: The Gyirong pegmatite in the Himalayan region was formed in the Miocene (16-15 Ma) and has low metallogenic potential for rare metals. It represents the long-term metamorphism and partial melting process of the Greater Himalayan Crystalline Complex (GHC).
Article
Chemistry, Physical
Mengxian Zhang, Wenjuan Fan, Binglin Zou, Ying Wang, Xiaolong Cai, Chunjie Wang, Xin Zhou, Xueqiang Cao
JOURNAL OF ALLOYS AND COMPOUNDS
(2017)
Article
Chemistry, Applied
Junbin Sun, Jinshuang Wang, Wenzhi Huang, Yu Hui, Xin Zhou, Lifen Li, Jianing Jiang, Longhui Deng, Yunya Niu, Shujuan Dong, Xueqiang Cao
JOURNAL OF RARE EARTHS
(2017)
Article
Materials Science, Multidisciplinary
Cunyan Fan, Binglin Zou, Ling Zhu, Wenjuan Fan, Xiaolong Cai, Ying Wang, Xueqiang Cao
MATERIALS & DESIGN
(2017)
Article
Materials Science, Ceramics
Junbin Sun, Jinshuang Wang, Xin Zhou, Shujuan Dong, Longhui Deng, Jianing Jiang, Xueqiang Cao
CERAMICS INTERNATIONAL
(2018)
Article
Materials Science, Ceramics
Xiong Yang, Jinyan Zeng, Hao Zhang, Jinshuang Wang, Junbin Sun, Shujuan Dong, Jianing Jiang, Longhui Deng, Xin Zhou, Xueqiang Cao
CERAMICS INTERNATIONAL
(2018)
Article
Materials Science, Ceramics
Jinshuang Wang, Junbin Sun, Jieyan Yuan, Qiangshan Jing, Shujuan Dong, Bing Liu, Hao Zhang, Longhui Deng, Jianing Jiang, Xin Zhou, Xueqiang Cao
CERAMICS INTERNATIONAL
(2018)
Article
Chemistry, Physical
Junbin Sun, Jinshuang Wang, Shujuan Dong, Yu Hui, Lifen Li, Longhui Deng, Jianing Jiang, Xin Zhou, Xueqiang Cao
JOURNAL OF ALLOYS AND COMPOUNDS
(2018)
Article
Chemistry, Physical
Jinshuang Wang, Junbin Sun, Hao Zhang, Shujuan Dong, Jianing Jiang, Longhui Deng, Xin Zhou, Xueqiang Cao
JOURNAL OF ALLOYS AND COMPOUNDS
(2018)
Article
Chemistry, Physical
Jieyan Yuan, Junbin Sun, Jinshuang Wang, Hao Zhang, Shujuan Dong, Jianing Jiang, Longhui Deng, Xin Zhou, Xueqiang Cao
JOURNAL OF ALLOYS AND COMPOUNDS
(2018)
Article
Materials Science, Ceramics
Xin Zhou, Jinshuang Wang, Jieyan Yuan, Junbin Sun, Shujuan Dong, Limin He, Xuegiang Cao
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2018)
Article
Materials Science, Ceramics
Jinshuang Wang, Junbin Sun, Qiangshan Jing, Bing Liu, Hao Zhang, Yongsheng Yu, Jieyan Yuan, Shujuan Dong, Xin Zhou, Xueqiang Cao
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2018)
Article
Materials Science, Ceramics
Junbin Sun, Jinshuang Wang, Xin Zhou, Yu Hui, Shujuan Dong, Lifen Li, Longhui Deng, Jianing Jiang, Xueqiang Cao
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2018)
Article
Materials Science, Ceramics
Wenjuan Fan, Binglin Zou, Cunyan Fan, Ying Wang, Xiaolong Cai, Shunyan Tao, Jiaying Xu, Chunjie Wang, Xuegiang Cao, Ling Zhu
CERAMICS INTERNATIONAL
(2017)
Article
Materials Science, Ceramics
Jinshuang Wang, Junbin Sun, Binglin Zou, Xin Zhou, Shujuan Dong, Lifen Li, Jianing Jiang, Longhui Deng, Xueqiang Cao
CERAMICS INTERNATIONAL
(2017)
Article
Materials Science, Multidisciplinary
Xin Zhou, Limin He, Xueqiang Cao, Zhenhua Xu, Rende Mu, Junbin Sun, Jieyan Yuan, Binglin Zou