Article
Geochemistry & Geophysics
Axel Muller, William Keyser, William B. Simmons, Karen Webber, Michael Wise, Hartmut Beurlen, Idoia Garate-Olave, Encarnacion Roda-Robles, Miguel Angel Galliski
Summary: Analysis of quartz from different pegmatites worldwide using LA-ICP-MS revealed that the chemistry of pegmatite quartz is mainly controlled by the source rock chemistry of pegmatite melts. Chemically primitive pegmatites may be suitable for high-tech applications, while quartz with high concentrations of Li and Al may indicate economic mineralization.
Article
Geochemistry & Geophysics
Zhaoyu Yang, Rucheng Wang, Xudong Che, Lei Xie, Huan Hu
Summary: The Nanyangshan Li-Cs-Ta pegmatite in North China is the largest in the region and exhibits a zonal distribution of lithium mineralization, with spodumene being the dominant mineral in the intermediate zone. The sequence of lithium mineralization can be summarized as Li-aluminosilicates -> Li-phosphates -> elbaite -> lepidolite, which is consistent with the global occurrences of LCT pegmatites.
AMERICAN MINERALOGIST
(2022)
Article
Geology
Chun Huan, Hai -Zhen Wei, Wen-Bin Zhu, M. R. Palmer, He-Feng Lin, Bi -Hai Zheng, Yue Cai, Da-Sheng Zuo, Jun-Lin Wang, Zhi-Qin Xu
Summary: This study investigates the association between Li enrichment and granitic magma evolution in the Jiajika pegmatite-type Li deposit using B isotope analyses of tourmaline grains. The results suggest that magma differentiation and fluid exsolution facilitate the enrichment of Li during granitic magmatic evolution. This has important implications for the formation and exploration of Li deposits.
ORE GEOLOGY REVIEWS
(2023)
Article
Geosciences, Multidisciplinary
Wenli Sun, Zhidan Zhao, Yaoling Niu, Chunjing Wei, Guochen Dong, Xiaowei Li, Wanming Yuan, Tao Wang, Bingzhang Wang, Tong Pan, Jie Han, Hongliang Cao, Yan Tang, Dicheng Zhu
Summary: The petrogenesis of granitic pegmatite veins in the Chakabeishan Li-Be deposit on the Northern Tibetan Plateau was studied using in-situ major element and B isotope compositions of tourmalines. The results suggest that the pegmatite veins are likely formed through both magmatic and hydrothermal processes, with different generations of tourmalines recording the evolution of the melts and fluids.
GEOSCIENCE FRONTIERS
(2023)
Article
Materials Science, Multidisciplinary
Danilo C. Curtolo, Martin J. Rodriguez-Rojas, Semiramis Friedrich, Bernd Friedrich
Summary: The increasing demand for ultra-high purity aluminum for technological applications has led to the improvement of purification methods. This article compares the three-layer electrolytic process and fractional crystallization methods, with experimental demonstration of the competitive advantage of cooled finger over zone melting in refining aluminum.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Geochemistry & Geophysics
Junyu Li, Shuyun Cao, Xuemei Cheng, Lei Jin, Meixia Lyu
Summary: Granitic pegmatites formed along the Ailao Shan-Red River shear zone (ASRR-SZ) in Southeast Asia at 28-23 Ma during left-lateral shearing. They are characterized by high SiO2 (65.6%-76.2%), moderate K2O (2.6%-7.4%), low MgO (0.1%-0.3%), and high differentiation index (DI = 82.4-95.3). Zircon geochemistry suggests a crustal origin, and the pegmatites formed during transpressional deformation with temperatures around 621-860℃ and fluid trapping temperatures of 180-350℃.
Article
Geochemistry & Geophysics
Yongchao Liu, Jiankang Li
Summary: Zabuyelite can form in both sedimentary and igneous environments, and its solubility in aqueous solution increases with temperature and pressure. It grows quickly from dissolved Li2CO3 aqueous solutions, forming tabular crystals with pseudo-hexagonal outlines. Zabuyelite can also crystallize as microcrystals in Li2CO3 melt, with a dominant temperature range of 450-600 degrees Celsius.
Article
Geology
Yonggang Feng, Jubiao Cen, Ting Liang, Mengxi Wang, Xijuan Tan, Yuanyuan Hao, Shanshan Yan
Summary: This study investigates the substitution mechanisms for lithium, phosphorus, and rare earth elements (including yttrium) in garnets from different pegmatite fields in China. The results show that lithium and sodium can enter the garnet lattice through coupled substitution with other elements. The dominant substitution mechanism depends on the bulk chemistry of the pegmatite-forming melts. Rating: 9 out of 10.
ORE GEOLOGY REVIEWS
(2023)
Article
Geochemistry & Geophysics
Rong Yin, Xiao-Long Huang, Ru-Cheng Wang, Gang-Jian Wei, Yi-Gang Xu, Yu Wang, Xiao-Ming Sun, Le Zhang, Xiao-Ping Xia
Summary: LCT-type pegmatites are characterized by zoning texture and extreme enrichment of rare-metals. Tourmaline is ubiquitously present in all textural zones and exhibits a range of compositions. The decreasing δ11B values of tourmalines from outer to inner zones are attributed to the separation of an immiscible fluid phase. The occurrence of hydrothermal tourmaline indicates the exsolution of fluids, facilitating the precipitation of rare-metal minerals. Fractional crystallization and exsolved fluids play significant roles in the formation of internal zones and rare-metal mineralization in LCT-type pegmatites.
Article
Geology
Jiankang Li, Qinggao Yan, Peng Li, Mark Ivan Jacobson
Summary: Granitic pegmatites are coarse-to-gigantic-sized igneous rocks that are the main source of rare metals and gem resources. Their formation is linked to plate movements and crustal growth during orogeny. Through the study of isotopic ages and compositions in Chinese granite-pegmatite fields, the formation patterns and controlling factors during orogeny were examined, revealing changes in pegmatite types and associations with different orogenies. The understanding of metasediments within orogenies and their connection to pegmatite formation contributes to the identification of potential prospecting areas for rare metal deposits.
ORE GEOLOGY REVIEWS
(2023)
Article
Geology
ChengXian Liu, FengYue Sun, JiQing Li, Jie Han, Ye Qian, YaJing Zhang, Chao Hui, Shahzad Bakht
Summary: In this study, a newly rare metal metallogenic belt in the North Qaidam Terrane, NW China, was discovered, with the Chakabeishan Li-Be pegmatitic deposit as an important part. The pegmatites in Chakabeishan exhibit unique internal vertical zonation characteristics, and their evolution was elucidated through U-Pb zircon ages, Hf isotope dating, whole-rock geochemistry, and mineral geochemistry.
ORE GEOLOGY REVIEWS
(2022)
Article
Geology
Feng YongGang, Liang Ting, Wang MengXi, Zhang Ze, Hao YuanYuan, Cen JuBiao, Dong ZiYan
Summary: In this study, the compositional variation of black tourmaline from different types of pegmatites in the East Qinling region was investigated. The results showed that the geochemical characteristics of tourmaline can serve as a mineralization indicator. Li, Mn, Zn, and F concentrations in schorl tourmaline increase with increasing differentiation degree of the pegmatites, and they exhibit a negative correlation with tourmaline delta(11) B. This provides a potential tool for indicating various pegmatite-hosted rare-element mineralization in the region.
ACTA PETROLOGICA SINICA
(2022)
Article
Geochemistry & Geophysics
David London
Summary: This study investigated the cores of Macusani green obsidian pebbles from Peru and found that the crystallinity of the products varied despite being subjected to subliquidus temperatures for thousands of hours. The mineral assemblages along the length of the cores were also found to vary, but not in relation to the thermal gradients. Chemical gradients in the glasses were observed, including sharp boundary layer pile-up of certain elements near the crystallization fronts. The study also revealed the temperature recorded by feldspars and the solvus on the alkali feldspar join for the first time.
AMERICAN MINERALOGIST
(2023)
Article
Chemistry, Multidisciplinary
Jianfei Fu, Yuzeng Yao, Jing Liu, Zining Li, Sanshi Jia, Yemao Pang
Summary: The Lijiapuzi Nb-Ta deposit is the only pegmatite-type Nb-Ta deposit in Northeast China, and a detailed study of this deposit is crucial for understanding the metallogeny and exploration of rare metal deposits in the region.
APPLIED SCIENCES-BASEL
(2022)
Article
Geosciences, Multidisciplinary
Dalton M. McCaffrey, Simon M. Jowitt
Summary: This study investigates the influence of crystallization temperature and undercooling on critical metal mineralization in granitic pegmatite deposits. The analysis of a global compilation of naturally-measured crystallization temperatures reveals that large degrees of undercooling are necessary for critical metal mineralization. Different pegmatite families and associated commodities require different petrogenetic processes, and internal pegmatite zoning can be explained by variability in the degree of undercooling.
EARTH-SCIENCE REVIEWS
(2023)
Article
Geochemistry & Geophysics
Huichuan Liu, Alan R. Hastie, Chiara Maria Petrone
Summary: This study conducted isotope analyses on two ocean island basalt (OIB)-associated enriched mafic intrusions in the Yunnan-Burma region, and found that these rocks may have originated from the subduction recycling of marine sediments and altered oceanic crust.
Article
Geochemistry & Geophysics
L. Notini, M. Scambelluri, A. Tommasi, A. Zanetti, F. Ferri, A. Rodriguez-Vargas, E. Rampone
Summary: This study provides important petrologic information on the mantle wedge above an active subduction zone in Southern Colombia. The researchers analyzed a unique suite of rock samples and found evidence of hydration, metasomatism, and partial melting in the mantle wedge. They also observed variations in lithotypes, textures, and mineral abundance, indicating different interactions with melts and fluids. This study sheds light on the complex petrological processes occurring in the mantle wedge and contributes to our understanding of subduction zone dynamics.
Article
Geochemistry & Geophysics
Sourav Bhattacharjee, Aniket Chakrabarty, Roger H. Mitchell, Suresh Chandra Patel, Evgeniy N. Kozlov, Ekaterina N. Fomina, Monojit Dey, Supratim Pal
Summary: The Hogenakkal complex in India consists of silicate-rich and silicate-poor carbonatites and clinopyroxenites. The formation of carbonatite is influenced by silicate minerals. The carbohydrothermal mineralization in the carbonatites is induced by magma-derived fluids and interactions with the surrounding rocks.
Article
Geochemistry & Geophysics
Jia-Min Wang, Kyle Patrick Larson, Jin-Jiang Zhang, Liang Zhao, Fu-Yuan Wu
Summary: The role of collisional belts in the global carbon budget is controversial. This study reveals a previously unrecognized carbon source in the collisional orogen of the Himalayas, where metamorphism of carbonate-bearing rocks in the hanging wall resulted in significant CO2 degassing.
Article
Geochemistry & Geophysics
Joseph Martial Akame, Elson Paiva Oliveira, Vinciane Debaille, Marc Poujol, Bernhard Schulz, Dieudonnee Bisso, Fabien Humbert, Serge Parfait Koah Na Lebogo, Philmont Zo'o Zame
Summary: Archean granitoids play key roles in the crustal evolution and can provide important insights into early geologic processes.
Article
Geochemistry & Geophysics
Xiguang Huang, Jun He, Jingxin Zhao, Jingzhao Dou, Weiyong Li, Aimin Hu, Ge Liu, Yiru Ji, Fukun Chen, Shuangqing Li
Summary: This study investigates the zircon ages and whole-rock geochemical data of Late Paleozoic magmatic rocks in the Western Yunnan Tethyan belt to identify the origin and mechanism of mantle melting. The results suggest that these magmatic rocks may originate from different mantle domains that were metasomatized by slab-derived fluids and sediment-derived melts.