Article
Geochemistry & Geophysics
Ronghua Guo, Xiumian Hu, Eduardo Garzanti, Wen Lai
Summary: This study proposed a new integrated approach to fingerprint the origin of detrital tourmaline grains and tested its usefulness in identifying source rocks. Results showed that B isotope values are useful as a source indicator for tourmaline grains. Researchers also established a database of B isotope values for tourmaline crystals in different types of exposed rock to promote the use of B isotope values in provenance studies.
Article
Geochemistry & Geophysics
Kui-Dong Zhao, Ling-Huo Zhang, Martin R. Palmer, Shao-Yong Jiang, Cong Xu, He-Dong Zhao, Wei Chen
Summary: The Dachang Sn-polymetallic ore district in South China is the second largest tin district in the world, with various types of tin deposits including Zn-Cu skarn and stratiform, massive, and vein Sn-Pb-Zn ores. The origin and composition of tourmaline in different types of deposits within the district provide insights into the source and evolution of hydrothermal fluids in the region. The variations in major and trace element compositions, as well as boron isotopic signatures, suggest different sources and evolutionary paths for the hydrothermal fluids associated with the tin deposits in the Dachang ore district.
MINERALIUM DEPOSITA
(2021)
Article
Geology
Zhuang Zhao, Xiaoyong Yang, Tuyan Zhang, Youyue Lu, Wanying Li, Zunzun Zhang
Summary: This study investigates the magmatic-fluid evolution and ore-forming processes of the Baishaziling greisen-type tin deposit by conducting detailed petrography and geochemical studies of different types of tourmalines. The results suggest that the mechanism of Sn enrichment and deposition may be related to fluid-rock interaction and fluid mixing.
ORE GEOLOGY REVIEWS
(2022)
Article
Geosciences, Multidisciplinary
Guyue Hu, Li'e Gao, Lingsen Zeng, Yike LI
Summary: Tourmaline geochemistry and boron isotopic compositions provide evidence for country rock assimilation during the intrusion of Himalayan leucogranite in the Gyirong-Malashan areas. Different types of tourmaline were identified in the Himalayan orogen, and the characteristics of tourmaline can be used to trace the interaction between leucogranitic veins and metasedimentary country rocks.
ACTA GEOLOGICA SINICA-ENGLISH EDITION
(2022)
Article
Geochemistry & Geophysics
Zhuang Zhao, Xiaoyong Yang, Qiyao Liu, Youyue Lu, Shanshan Chen, Chao Sun, Zunzun Zhang, Hai Wang, Shuang Li
Summary: The study systematically investigated different types of tourmaline in Shangbao Nb-Ta deposit, identifying the origin, boron source, and Nb-Ta enrichment process based on major, trace elemental and boron isotope analyses. The results revealed that tourmaline precipitated from melt at late magmatic stage, crystallized during magmatic-hydrothermal transition, or originated from hydrothermal fluid, each showing distinct boron sources. High Nb and Ta contents in tourmaline from Shangbao monzogranite suggest its potential as an exploration tool for targeting Nb and Ta mineralization.
Article
Geochemistry & Geophysics
Yan Qin, Yang Li, Chenghui Wang, Lijun Liu, Kejun Hou, Qian Wang
Summary: The Jiajika rare metal deposit in China is the largest area of granitic pegmatite-type rare metal deposits in China. The X03 vein is a massive rare metal deposit dominated by lithium. This paper systematically studies the tourmaline found in different rocks of the Jiajika X03 vein in terms of its major element, trace element, and boron isotope data. The results show that the tourmalines in the deposit belong to different solid solutions and their boron isotope values indicate the origin of the boron involved in the formation process of tourmaline and the mineralization type of pegmatite.
Article
Geochemistry & Geophysics
Matthieu Harlaux, Kalin Kouzmanov, Stefano Gialli, Katharina Marger, Anne-Sophie Bouvier, Lukas P. Baumgartner, Andrea Rielli, Andrea Dini, Alain Chauvet, Miroslav Kalinaj, Lluis Fontbote
Summary: The study on oxygen and boron isotopes in tourmaline from the San Rafael Sn (-Cu) deposit reveals the major fluid processes at the magmatic-hydrothermal transition leading to cassiterite precipitation. Variations in isotopic composition indicate fluid mixing of different sources during different stages, influencing the deposition of cassiterite. This study demonstrates the effectiveness of in situ isotopic analysis in understanding fluid processes in dynamic magmatic-hydrothermal environments.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geochemistry & Geophysics
Emily D. Scribner, Jan Cempirek, Lee A. Groat, R. James Evans, Cristian Biagioni, Ferdinando Bosi, Andrea Dini, Ulf Halenius, Paolo Orlandi, Marco Pasero
Summary: Magnesio-lucchesiite is a new mineral species of the tourmaline supergroup, characterized by black crystals with vitreous luster, estimated hardness of 7-8, and densities of 3.168 (Canada) and 3.175 g/cm(3) (Italy). Its crystal structure was refined, showing pleochroic properties and trigonal symmetry.
AMERICAN MINERALOGIST
(2021)
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
Geosciences, Multidisciplinary
Lukas Krmicek, Milan Novak, Robert B. Trumbull, Jan Cempirek, Stanislav Houzar
Summary: Various metacarbonate and calc-silicate rocks in the Bohemian Massif of the Variscan orogen contain tourmaline in different paragenetic settings, each showing distinctive compositional features. The presence of tourmaline with different B-isotope compositions in specific units suggests regional variations and possible metamorphic processes within the studied areas.
GEOSCIENCE FRONTIERS
(2021)
Article
Geosciences, Multidisciplinary
Beiqi Zheng, Bin Chen, Keke Sun, Chao Huang
Summary: This study conducted elemental and boron isotope analyses on tourmalines from a pegmatite dyke in the Altay orogen. The results indicate that the pegmatite originated from direct melting of metapelitic rocks, with some fluid exsolution and boron fractionation during magmatic evolution.
JOURNAL OF ASIAN EARTH SCIENCES
(2022)
Article
Geochemistry & Geophysics
Lining Cheng, Chao Zhang, Xiaochi Liu, Xiaosong Yang, Yongsheng Zhou, Ingo Horn, Stefan Weyer, Francois Holtz
Summary: The study focused on the analysis of tourmalines in the Gurla Mandhata tourmaline leucogranites from the Himalayas, revealing the potential of using boron isotopic composition of tourmaline to trace magma evolution processes, with evidence of multiple-stage boron isotopic fractionation and possible mixing of magmas from different sources.
Article
Geology
Xiu-Fang Lei, Rolf L. Romer, Johannes Glodny, Shao-Yong Jiang
Summary: We analyzed Li and B isotopes in muscovite, biotite, and feldspar + quartz from two types of granite samples collected in central China. Our results revealed systematic differences in isotopic compositions among these minerals. The study suggests that early-crystallizing minerals have lower 67Li and 611B values compared to the original melt, while residual melts and late magmatic fluids show anomalously high 67Li and 611B values. Additionally, our findings indicate that late melts and magmatic fluids do not reflect the composition of their source, and mineral-selective alteration by late magmatic fluids masks the source of the fluid.
Article
Geochemistry & Geophysics
Martin Kutzschbach, Bernd Wunder, Iris Wannhoff, Franziska D. H. Wilke, Frederic Couffignal, Alexander Rocholl
Summary: Raman spectroscopy analysis of synthesized tourmalines revealed a correlation between tetrahedral boron content and OH-stretching band intensity, demonstrating its utility as a tool for quantifying tetrahedral boron in tourmaline. This knowledge is crucial for understanding B-isotope fractionation processes between tourmaline and fluid/melt, commonly used as a tracer for mass transfer processes.
AMERICAN MINERALOGIST
(2021)
Article
Geochemistry & Geophysics
Jinsheng Han, Huayong Chen, Haijun Xu, Olivier Nadeau, Chang Xu
Summary: English Summary: In this study, autocrystalline and xenocrystalline tourmalines were identified in two-mica granites and granitic pegmatites from the Cuonadong leucogranites in the eastern Himalayas. The researchers used electron backscatter diffraction (EBSD), electron-probe micro-analysis (EPMA), and laser ablation ICP-MS analyses (LA-ICP-MS) to discriminate between autocrystalline and xenocrystalline tourmaline. EBSD was found to be a useful tool for identifying the origin of tourmaline in granitic rocks, especially when geochemical analyses and/or geochronological measurements are inconclusive.
AMERICAN MINERALOGIST
(2023)
Article
Mineralogy
Axel Muller, William Simmons, Hartmut Beurlen, Rainer Thomas, Peter M. Ihlen, Michael Wise, Encarnacion Roda-Robles, Ana M. R. Neiva, Victor Zagorsky
Summary: This study is the precursor and complementary study for the classification of granitic pegmatites, analyzing existing classification criteria and proposing a new classification scheme.
CANADIAN MINERALOGIST
(2022)
Article
Geosciences, Multidisciplinary
Axel Muller, Rolf L. Romer, Lars Eivind Augland, Haoyang Zhou, Nanna Rosing-Schow, John Spratt, Tomas Husdal
Summary: Pegmatites can form from residual melts or partial melting of granites. The Tysfjord area in Norway contains two groups of pegmatites, one formed from residual melts and the other formed from partial melting of the granite gneiss. These findings provide valuable insights into the formation and evolution of rocks.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2022)
Article
Mineralogy
Michael A. Wise, Axel Muller, William B. Simmons
Summary: This article presents the current classification system of granitic pegmatites, introduces a new classification method, and explains the advantages and scope of this method compared to previous classification schemes.
CANADIAN MINERALOGIST
(2022)
Article
Soil Science
A. Molinero-Garcia, A. Muller, J. M. Martin-Garcia, S. L. Simonsen, R. Delgado
Summary: This paper examines the quartz grains in soils from the Quaternary fluvial terraces of the Guadalquivir River in southern Spain. Through analysis of the quartz grains' characteristics, the study sheds light on the sedimentological history of the terraces and discusses the spatial and temporal changes in the catchment area.
Article
Geochemistry & Geophysics
Haoyang Zhou, Axel Mueller, Lars Eivind Augland, Magnus Kristoffersen, Muriel Erambert
Summary: This study uses titanite geochemistry to investigate the Caledonian metamorphic evolution of Paleoproterozoic pegmatites in Tysfjord, Northern Norway. The results suggest that the pegmatites experienced metamorphism after tectonomagmatic events and were formed later than the peak metamorphism, with a link to post-collisional extension during the Caledonian orogeny.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geochemistry & Geophysics
Rami Alshembari, James Hickey, Ben J. Williamson, Katharine Cashman
Summary: Characterizing the physical properties and mechanical behavior of melt reservoirs is crucial for improving geophysical models. Studies suggest that shallow magmatic reservoirs consist of variably packed crystal frameworks with small volumes of interstitial melt, known as mushes. This research investigates the influence of poroelastic mechanical behavior on reservoir pressure evolution and surface deformation.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
William Keyser, Axel Mueller, Ralf Steiner, Muriel Erambert, Magnus Kristoffersen, Thomas Unterweissacher
Summary: The Wolfsberg lithium deposit in Austria is a significant Li-Cs-Ta resource and it belongs to the Austroalpine Unit Pegmatite Province in the Eastern Alps. The deposit consists of amphibolite-hosted and mica schist-hosted pegmatite types, both showing peraluminous granitic compositions. The pegmatites were derived from the partial melting of basement mica schists during the Permian extensional event, with the amphibolite-hosted pegmatite containing higher concentrations of Li and Cs. The Cretaceous eclogite-facies metamorphism affected the mica schist-hosted pegmatite more, resulting in recrystallization and development of foliation, which concentrated remobilized elements along localized shear zones.
MINERALIUM DEPOSITA
(2023)
Article
Geochemistry & Geophysics
Axel Mueller, Doug Kirwin, Reimar Seltmann
Summary: Ten rock samples from porphyry and intrusion-related Au deposits were investigated in terms of mineralization sequences, textural relationships, melt and fluid inclusion inventory, cathodoluminescence, and trace elements of quartz. Each locality has its own specific textural features. The USTs can form in either an open or closed system setting, and the UST sequences are important exploration vectors for porphyry systems. Six of the ten UST samples are high-grade with up to 12 g/t Au. The UST layer sequences can act as a trap for mineralizing fluids. Evaluation: 8/10
MINERALIUM DEPOSITA
(2023)
Article
Geology
Fei Zhang, Ben J. Williamson, Gavyn K. Rollinson, Hannah S. R. Hughes
Summary: This study investigates the formation of ore-barren endoskarns in the Tonglushan quartz monzodiorite porphyry system in eastern China. The endoskarn underwent various alterations including muscovite-dominated, skarnification, potassic, sodic, and carbonatization. Mineralization primarily occurred in the exoskarns rather than the endoskarns. This offers new insights into the occurrence of 'barren' endoskarns and mineralized exoskarns in porphyry systems.
ORE GEOLOGY REVIEWS
(2023)
Editorial Material
Geochemistry & Geophysics
Axel Mueller, Encarnacion Roda-Robles
Article
Geochemistry & Geophysics
William Keyser, Axel Mueller, Tanja Knoll, Julian F. Menuge, Ralf Steiner, Jasper Berndt, Emmett Hart, Thomas Fegan, John Harrop
Summary: This study examined the trace element concentrations in quartz from two major pegmatite occurrences in Europe to evaluate the use of quartz as a pathfinder mineral for Li mineralized pegmatites. The results showed that quartz from spodumene pegmatites had higher concentrations of Al, Li, Ge, and B, while quartz from simple pegmatites had higher concentrations of Ti. The chemical profiles of individual spodumene pegmatite bodies exhibited little variation, suggesting Li saturation throughout their crystallization history. High Ge, Be, and B concentrations characterized quartz in pegmatites from the Austroalpine Unit, while high Al and Li concentrations characterized quartz in pegmatites from Moylisha. Concentrations of Al and Li in pegmatite quartz above a certain threshold were indicative of potential spodumene mineralization. The robustness of quartz as a pathfinder tool for Li mineralized pegmatites was supported by the retention of pegmatite chemical signatures at Wolfsberg.
Article
Geochemistry & Geophysics
Haoyang Zhou, Axel Mueller, Jasper Berndt
Summary: This study combines statistical quartz chemistry and petrographic observations to investigate the formation of the pegmatite-type high-purity quartz deposits in Tysfjord, Northern Norway. The results reveal different characteristics of the Paleoproterozoic and Devonian pegmatites, including Caledonian deformation and fluid inclusion-bearing microcracks. Trace element analysis shows that the quartz chemistry is dominated by Al, Ti, Li, Ge, and B, with varying concentrations in the different types of pegmatites. The study highlights the importance of magmatic activity and metamorphic modifications in the formation of high-purity quartz deposits.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geology
Fei Zhang, Ben J. Williamson, Sam Broom-Fendley
Summary: The composition and properties of apatite in different components of the Tonglushan porphyry-skarn system were compared to explore its potential as an indicator mineral for copper and skarn deposits. The results show that the apatite in different components exhibits distinct cathodoluminescence (CL) colors and compositions, providing insights into the alteration styles and mineralization processes. This study suggests that apatite could be a potentially effective indicator mineral for porphyry and skarn deposits in various exploration materials.
ORE GEOLOGY REVIEWS
(2023)
Article
Geochemistry & Geophysics
Rami Alshembari, James Hickey, Ben J. Williamson, Katharine Cashman
Summary: Understanding the mechanical evolution of magmatic systems requires careful assessment of their rheological characteristics, particularly in light of the growing evidence that magma reservoirs are dominated by magma-mush surrounded by thermally-altered host-rock. We develop models for volcano deformation based on a poroviscoelastic source within a thermo-viscoelastic host. Our models consider the competing roles of poroelastic diffusion, and viscoelastic creep and relaxation, and emphasize the importance of considering both the host rock and magma-mush viscoelastic properties to understand the processes that cause surface deformation during and after melt intrusion.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Environmental Sciences
Jochen Knies, Jasmin Schonenberger, Horst Zwingmann, Roelant van der Lelij, Morten Smelror, Per Erik Vullum, Marco Bronner, Christoph Vogt, Ola Fredin, Axel Muller, Stephen E. Grasby, Benoit Beauchamp, Giulio Viola
Summary: This study reveals that intense continental chemical alteration occurred during the Early Triassic period due to an accelerated hydrological cycle. Although the enhanced ocean nutrient supply did not trigger increased ocean productivity, the recovery from ocean nutrient stress began around 10 million years after the mass extinction, when global upwelling systems and ocean mixing were revitalized.
COMMUNICATIONS EARTH & ENVIRONMENT
(2022)