Article
Geochemistry & Geophysics
A. K. Engvik, C. A. Trepmann, H. Austrheim
Summary: The microfabric evolution and mineral reactions during metasomatism and associated deformation in Proterozoic foliated and nodular sillimanite gneisses from South Norway are analyzed. The findings suggest the involvement of chemical rock changes and mass transfer in the observed reaction and deformation microfabric.
Article
Astronomy & Astrophysics
Charity M. Phillips-Lander, Jamie L. Miller, Megan Elwood Madden
Summary: Plagioclase minerals are widespread on the Mars surface, with variable compositions affected by different factors. Studying the dissolution of plagioclase provides insights into the weathering processes and evolution history of Mars.
Article
Geochemistry & Geophysics
Bartosz Budzyn, Richard Wirth, Jiri Slama, Gabriela A. Kozub-Budzyn, Patrik Konecny, Grzegorz Rzepa, Anja Schreiber
Summary: This study examines the fluid-mediated alterations and geochronological implications of pegmatitic xenotime crystals from a quarry in Norway. The crystals undergo dissolution-reprecipitation processes that result in the formation of depleted xenotime subdomains with microinclusions of (Th, U)-silicate, uraninite, and minor galena. Primary xenotime had a mean age of 988.4 +/- 5.9 Ma, while altered xenotime crystals produced highly scattered dates ranging from 200 +/- 14 to 2135 +/- 120 Ma. TEM analysis revealed the progression of alterations in primary xenotime and the presence of submicron-sized inclusions. These findings provide important insights into the mobilization of U, Th, and Pb in xenotime.
Article
Geochemistry & Geophysics
Meng Yu, Qiong-Xia Xia, Yong-Fei Zheng, Zi-Fu Zhao, Yi-Xiang Chen, Ren-Xu Chen, Xu Luo, Wan-Cai Li, Haijun Xu
Summary: Two generations of garnet are identified in a granite and a pegmatite in the Gangdese orogen, with the first generation representing an early nucleation stage related to magmatic-hydrothermal fluids, and the second generation crystallizing in the presence of granitic magma in the pegmatite. The granite garnets display homogeneous characteristics typical of magmatic garnets, while the pegmatite garnet's composition suggests crystallization from the same granitic magma.
AMERICAN MINERALOGIST
(2021)
Article
Chemistry, Physical
Liudmila A. Gorelova, Anna S. Pakhomova, Maria G. Krzhizhanovskaya, Dmitrii Pankin, Sergey Krivovichev, Leonid S. Dubrovinsky, Anatoly Kasatkin
Summary: The high-pressure behaviors of slawsonite and paracelsian were investigated, showing displacive phase transitions and forming new structures under certain pressures. Raman spectroscopy can be used to confirm these phase transitions and the high-pressure structures can be retained upon decompression. The change in size of the extra framework cation affects the phase transition pressure, but does not alter the transformation pathway.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Geochemistry & Geophysics
Bartosz Budzyn, Richard Wirth, Jiri Slama, Lukasz Birski, Fabian Tramm, Gabriela A. Kozub-Budzyn, Grzegorz Rzepa, Anja Schreiber
Summary: Experimental study on metasomatised monazite reveals that increasing temperature leads to evolution of monazite structure, while alteration processes induced by alkali-bearing fluid can result in recrystallization and disturbance of U-Pb and Th-Pb ages.
Article
Geochemistry & Geophysics
Idowu A. Adegoke, Fang Xia, Artur P. Deditius, Mark A. Pearce, Malcolm P. Roberts, Joel Brugger
Summary: Mineral replacement reactions are influenced by solid-state diffusion and coupled dissolution-reprecipitation (CDR) mechanisms. At low temperatures, such as 160-200 degrees Celsius, solid-state diffusion and CDR processes play a dominant role in copper mineral replacement reactions. Experimental results show that the presence of hydrothermal fluids can induce solid-state exsolution, while the absence of fluids will not lead to this phenomenon.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Chemistry, Physical
Cuihua Tang, Huan Dong
Summary: This paper investigates the coupling relationship between surface dissolution of albite and Cu2+ adsorption, and finds that Cu2+ adsorption can promote the release of elements from the surface of albite.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Geochemistry & Geophysics
Lewis Hughes, Simon Cuthbert, Alex Quas-Cohen, Lorraine Ruzie-Hamilton, Alison Pawley, Giles Droop, Ian Lyon, Romain Tartese, Ray Burgess
Summary: This study analyzed ultra-high-pressure eclogites and ultramafites and associated fluid inclusions from the Western Gneiss Region of the Norwegian Caledonides for F, Cl, Br and I. The results indicate efficient fractionation of F from Cl by hydrous mineral crystallization under UHP conditions and heavy halogen ratios higher than modern seawater. There is no correlation between Cl and Br or I, suggesting different behavior of Cl during subduction compared to Br and I.
Article
Chemistry, Physical
Bastien Wild, Claire E. White, Ian C. Bourg
Summary: This study uses non-equilibrium molecular dynamics simulations to investigate reverse osmosis in nanopores. The results show that fluid flow in the nanopores is consistent with classical theories, but the flow rate decreases as expected from non-equilibrium thermodynamics. In addition, there is a preferential transport of anions over cations in both uncharged and negatively charged nanopores.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Mineralogy
Tara R. McElhinney, Tim J. Dempster, Peter Chung
Summary: The response of garnet and zircon to prograde amphibolite-facies metamorphism in late Proterozoic mica schists from the Scottish Highlands has been investigated. Results show that fluid availability and matrix permeability strongly control the metamorphic response, and different generations of garnet contain different populations of metamorphic micro-zircon. Micro-zircon abundance increases during garnet growth, but decreases in detrital zircon. The mineralogy of the matrix also affects zircon abundance in porphyroblast phases.
MINERALOGICAL MAGAZINE
(2022)
Letter
Geochemistry & Geophysics
Bartosz Budzyn, Richard Wirt, Jirf Slama, Gabriela A. Kozu-Budzyn, Anja Schreiber
Summary: The distribution of Th and U in the crystal of pegmatitic xenotime-(Y) has been studied using transmission electron microscopy (TEM), revealing the presence of unaltered domains with high Th and U, as well as altered domains with Th and U depletion and inclusions of (Th, U)-silicate and uraninite. The TEM examination of a FIB-foil prepared from the unaltered xenotime showed a network of dislocations, containing enriched U, Th, and Si material, surrounded by radiation-damaged xenotime. The migration and segregation of U and Th into dislocation cores at the atomic scale highlights the importance of nanoscale investigations in understanding age data and applying xenotime geochronology.
Article
Geochemistry & Geophysics
Benjamin L. Hess, Jay J. Ague, Peter W. Voorhees
Summary: Mineral compositions can be used to infer the pressure states in geological processes. However, previous research has limited understanding of non-ideal mixing behavior and multi-endmember cases. In this study, a new theory is applied to examine the stress-induced composition changes in minerals, considering non-ideal mixing and multiple endmembers. The results indicate that non-ideal mixing amplifies the predicted composition changes, and the presence of additional solid solution endmembers affects the stress-induced composition shifts of other endmembers. The findings suggest that mineral compositions can be used to infer stress states under certain conditions.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Chemistry, Physical
A. R. Lauer, R. Hellmann, G. Montes-Hernandez, N. Findling, W. L. Ling, T. Epicier, A. Fernandez-Martinez, A. E. S. Van Driessche
Summary: Multiple-step nucleation pathways exist in both inorganic and biomineral systems. Precise understanding of the nucleation steps and transformation mechanisms remains a challenging task. In this study, we investigated the nucleation pathway of SrSO4 under different solution parameters and found that the nucleation mechanism and the formation of intermediate phases are influenced by the physico-chemical conditions.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Geochemistry & Geophysics
Wei Zhang, Wei Terry Chen, Daniel Harlov, Jian-Feng Gao
Summary: This study investigates the effects of hydrothermal alteration on the U-Th-Pb dating of bastnasite in a Mo-REE deposit in Central China. It finds that non-radiogenic Pb is incorporated into altered bastnasite in the form of nanoscale galena inclusions, significantly affecting the U-Pb dating but having limited effects on the Th-Pb dating. The results highlight the need to treat the U-Pb and Th-Pb systems separately when dating bastnasite from secondary hydrothermal events.
AMERICAN MINERALOGIST
(2023)
Article
Engineering, Environmental
Hang Zhai, Lijun Wang, Lihong Qin, Wenjun Zhang, Christine V. Putnis, Andrew Putnis
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2018)
Article
Geochemistry & Geophysics
Stephen Centrella, Andrew Putnis, Pierre Lanari, Hakon Austrheim
Article
Engineering, Chemical
Tania Hidalgo, Laura Kuhar, Andreas Beinlich, Andrew Putnis
MINERALS ENGINEERING
(2018)
Article
Multidisciplinary Sciences
Andreas Beinlich, Hakon Austrheim, Vasileios Mavromatis, Ben Grguric, Christine V. Putnis, Andrew Putnis
NATURE COMMUNICATIONS
(2018)
Article
Geochemistry & Geophysics
Lijun Wang, Christine V. Putnis, Joern Hoevelmann, Andrew Putnis
Article
Geochemistry & Geophysics
Maria Rosa Scicchitano, Daniela Rubatto, Jorg Hermann, Alik S. Majumdar, Andrew Putnis
Article
Geology
Jo Moore, Andreas Beinlich, Hakon Austrheim, Andrew Putnis
Article
Geology
Alexander M. Prent, Andreas Beinlich, Laura J. Morrissey, Tom Raimondo, Chris Clark, Andrew Putnis
JOURNAL OF METAMORPHIC GEOLOGY
(2019)
Editorial Material
Geosciences, Multidisciplinary
Andrew Putnis, Christopher J. Spencer, Tom Raimondo
GEOSCIENCE FRONTIERS
(2019)
Article
Metallurgy & Metallurgical Engineering
Tania Hidalgo, Laura Kuhar, Andreas Beinlich, Andrew Putnis
Article
Geology
Jo Moore, Andreas Beinlich, Jennifer K. Porter, Cristina Talavera, Jasper Berndt, Sandra Piazolo, Hakon Austrheim, Andrew Putnis
JOURNAL OF METAMORPHIC GEOLOGY
(2020)
Article
Geology
Tania Hidalgo, Michael Verrall, Andreas Beinlich, Laura Kuhar, Andrew Putnis
ORE GEOLOGY REVIEWS
(2020)
Article
Geochemistry & Geophysics
Alexander M. Prent, Andreas Beinlich, Tom Raimondo, Christopher L. Kirkland, Noreen J. Evans, Andrew Putnis
Article
Engineering, Chemical
Tania Hidalgo, Laura Kuhar, Andreas Beinlich, Andrew Putnis
MINERALS ENGINEERING
(2020)
Article
Crystallography
Christine V. Putnis, Andrew Putnis
Summary: This article discusses the process of ion exchange in a range of solids through interface-coupled dissolution-precipitation in the presence of an aqueous solution.
JOURNAL OF CRYSTAL GROWTH
(2022)