Article
Geosciences, Multidisciplinary
Kun Zhou, Yi-Xiang Chen, Jia-Wei Xiong, Hans-Peter Schertl, Xiao-Ping Xia
Summary: This study investigates the impact of fluid action on zircon geochemistry in subduction zones, particularly during metamorphic and metasomatic processes. The results show that fluid action significantly affects the U-Pb and O isotope systems of zircon, especially when external metasomatic fluids are involved.
GEOSCIENCE FRONTIERS
(2023)
Article
Geochemistry & Geophysics
Olivier Vanderhaeghe, Andre-Mayer Anne-Sylvie, Diondoh Mbaguedje, Aurelien Eglinger, Maryse Ohnenstetter, Moussa Isseini, Michel Cuney, Marc Poujol, Marieke Van Lichtervelde
Summary: The Mayo-Kebbi massif in Chad exposes a Neoproterozoic juvenile crustal segment that underwent tectonic accretion in the Central African Orogenic Belt and reworking during the Pan-African orogeny. The Zabili pluton, a part of this segment, is composed of a highly differentiated granite formed by fractional crystallization, with associated uranium mineralization.
MINERALIUM DEPOSITA
(2021)
Article
Geosciences, Multidisciplinary
Veronique Gardien, Jean-Emmanuel Martelat, Philippe-Herve Leloup, Gweltaz Maheo, Benoit Bevillard, Pascal Allemand, Patrick Monie, Jean-Louis Paquette, Anne-Sabine Grosjean, Michel Faure, Cyril Chelle-Michou, Clementine Fellah
Summary: A leucogranite sill in the footwall of the extensional Pilat shear zone was emplaced and sheared between 301.8 +/- 3.1 and 303.0 +/- 1.6 Ma. The existence of a relief south of the shear zone and the filling of the St. Etienne Basin confirm the extensional phase. The rapid exhumation of the Velay dome was likely due to localized sub crustal lithospheric mantle dripping.
Article
Geosciences, Multidisciplinary
Susobhan Neogi, Tapan Pal
Summary: The Sonapahar sillimanite-corundum deposit in Meghalaya, Northeast India, is associated with high-grade metapelites and features an unusual occurrence of sillimanite-quartz, corundum-quartz, sapphirine-phlogopite-corundum-sillimanite rock. The pockets of sillimanite and corundum within the host quartz sillimanite schist have contrasting chemical signatures, suggesting a significant role of metasomatism in modifying the host rocks during post-peak metamorphism. Structural features and mineral enrichments near shear zones indicate that metasomatism played a key role in the formation of sillimanite-corundum rocks.
JOURNAL OF EARTH SYSTEM SCIENCE
(2021)
Article
Geochemistry & Geophysics
Martin Kubes, Jaromir Leichmann, Jana Kotkova, Renata Copjakova, Marketa Hola, Jiri Slama
Summary: A variable assemblage of rocks in the Bohemian Massif reflects the incorporation of contrasting mantle domains during the Variscan orogeny. This study provides important insights into the mantle history during the formation of the Variscan orogenic belt in Central Europe.
Article
Geochemistry & Geophysics
M. Dumanska-Slowik, T. Powolny, G. Nguyen Khac
Summary: The alkaline Cho Don complex in NE Vietnam is formed by mafic-felsic suites that resulted from widespread magmatism in the early Permian-late Triassic period. This study investigates the petrogenesis of nepheline syenite and its relationship with cogenetic scapolite-rich gabbro in the Bang Phuc massif. The nepheline syenite formed through fractional crystallization of mantle-derived basaltic melt modified by subduction-related components, and magma evolution involved the contribution of asthenospheric-derived melts. The presence of different minerals and their alteration patterns indicate fluid-rock interactions and changes in the crystalline structure of the rock.
JOURNAL OF PETROLOGY
(2023)
Article
Geosciences, Multidisciplinary
Irina. V. Karmysheva, Vladimir G. Vladimirov, Sergey N. Rudnev, Vladislav A. Yakovlev, Dina V. Semenova
Summary: Accretionary-collisional events at the western margin of the Tuva-Mongolian microcontinent explain the contradictory Cambrian geodynamic history of the western Central Asian Orogenic Belt. The Erzin metamorphic complex in the tectonic Erzin zone is composed of high-grade metamorphic rocks formed under variable metamorphic conditions. The complex underwent multiple stages of ductile deformation, marking a collisional event at 495 Ma.
JOURNAL OF ASIAN EARTH SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
Abhinaba Roy, Sandip Kumar Roy, H. M. Ramchandra
Summary: The mineral assemblages in ductile shear zones are affected by high-temperature fluids, leading to chemical metasomatism. In the Sakoli Fold Belt of central India, the occurrence of sillimanite in shear zones is influenced by infiltrated high-temperature fluids. The growth of sillimanite in these shear zones coincides with the peak of deformation and metamorphism, possibly due to the high-strain environment.
JOURNAL OF EARTH SYSTEM SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
Gustavo Viegas, Karoly Hidas, Paulo Castellan
Summary: By analyzing the microstructures of ultramylonite, pseudotachylyte, and cataclasite, it was found that they exhibit brittle-ductile fabrics, suggesting that pseudotachylyte was formed through seismic ruptures along discrete planes between the host granodiorite and ultramylonite.
JOURNAL OF STRUCTURAL GEOLOGY
(2021)
Article
Multidisciplinary Sciences
Evgeniy N. Kozlov, Ekaterina N. Fomina
Summary: This study develops a method to estimate the redistribution of elements during metasomatic processes using mass balancing and isocon analysis. The method can be applied when certain geological conditions are met, including inheritance of components from earlier rocks, transportation by fluid, and production of various metasomatic rocks rich in these components. The method calculates the mass proportions between the source rock and resulting metasomatic rocks, and provides geological criteria for verification.
Article
Materials Science, Multidisciplinary
W. H. Zhou, F. H. Duan, Y. H. Meng, C. C. Zheng, H. M. Chen, A. G. Huang, Y. X. Wang, Y. Li
Summary: The study systematically investigated the evolution of microstructure and mechanical properties of Zr-based bulk metallic glasses with varying oxygen content. Results showed that with increasing oxygen content, compressive plasticity decreased slightly before plunging drastically, revealing a threshold oxygen content level for ductile-brittle transition at 3500 at. ppm. The embrittlement at high oxygen content was closely related to changes in microstructure.
Article
Nanoscience & Nanotechnology
Kejin Zhang, Shigeru Hamada, Kotaro Shindome, Tatsuo Yokoi, Hiroshi Noguchi
Summary: In this study, tensile tests were conducted to determine the strength of partially worked metals, revealing the behavior change caused by shear cracks during tensile loading. The presence of microscopis brittle fractures causing shear cracks was also observed in specimens exhibiting macroscopic brittle fracture.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Environmental Sciences
Yingzheng Wang, Jia Li, Lixin Wu, Lei Guo, Jun Hu, Xin Zhang
Summary: This study estimated the glacier melting rate in the Xixabangma massif using various images and elevation data. The results showed a decrease in glacier area and an increase in glacial lake area, with three specific lakes expanding by over 100%. It indicated potential outburst risks for these lakes.
Article
Geochemistry & Geophysics
Yoshiya Usui, Makoto Uyeshima, Tsutomu Ogawa, Ryokei Yoshimura, Naoto Oshiman, Satoru Yamaguchi, Hiroaki Toh, Hideki Murakami, Koki Aizawa, Toshiya Tanbo, Yasuo Ogawa, Tadashi Nishitani, Shin'ya Sakanaka, Masaaki Mishina, Hideyuki Satoh, Tada-nori Goto, Takafumi Kasaya, Toru Mogi, Yusuke Yamaya, Ichiro Shiozaki, Yoshimori Honkura
Summary: The study reveals that the activity of the Atotsugawa fault is related to highly connected fluid in localized ductile shear zones in the lower crust, while the conductivity anomalies in the lower crust may stem from fluid dehydration from the Philippine Sea slab and the Pacific slab.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geosciences, Multidisciplinary
Jialong Wang, Ni Li, F. M. Stuart, L. D. Nicola, Huiping Zhang, Ying Wang, Jianzhang Pang, Yongwei Zhao
Summary: Three large-scale ductile shear zones are distributed in the southeast margin of the Qinghai-Tibet Plateau, with the Gaoligong shear zone being less well studied. In this study, low-temperature thermochronological methods were used to investigate the exhumation history of the Gaoligong Mountain. The results reveal two stages of rapid exhumation events and differences in exhumation rates and timing along the mountain.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Anthony Bouton, Emmanuelle Vennin, Philippe Amiotte-Suchet, Christophe Thomazo, Jean-Pierre Sizun, Aurelien Virgone, Eric C. Gaucher, Pieter T. Visscher
Article
Geology
Alexandre Cugerone, Benedicte Cenki-Tok, Emilien Oliot, Manuel Munoz, Fabrice Barou, Vincent Motto-Ros, Elisabeth Le Goff
Article
Geosciences, Multidisciplinary
Cyril Lobjoie, Pierre Trap, Emilien Oliot, Wei Lin, Fabrice Barou, Philippe Goncalves, Didier Marquer
JOURNAL OF STRUCTURAL GEOLOGY
(2020)
Article
Geochemistry & Geophysics
Alexandre Cugerone, Benedicte Cenki-Tok, Manuel Munoz, Kalin Kouzmanov, Emilien Oliot, Vincent Motto-Ros, Elisabeth Le Goff
Summary: Rare metals like Ge and Ga play a key role in green technology development and are commonly found in base-metal mineral deposits. This study uses advanced analytical techniques to investigate the distribution and impact of rare metals in sphalerite, highlighting the enrichment of Ge and Ga in vein mineralization. The remobilization of these elements due to partial recrystallization in sphalerite is proposed to result in the formation of patchy-oscillatory zoning and Ge-rich accessory minerals.
MINERALIUM DEPOSITA
(2021)
Article
Geosciences, Multidisciplinary
Claire Bossennec, Yves Geraud, Johannes Boecker, Bernd Klug, Luca Mattioni, Jean-Pierre Sizun, Masafumi Sudo, Isabelle Moretti
Summary: In-situ delta O-18 measurements in quartz overgrowths within the Buntsandstein Gp. sandstone reservoirs in the Upper Rhine Graben reveal two types of evolution linked to burial temperature increase and injection of allochthonous fluids. The fluids causing quartz cementation are either autochthonous buffered in O-18 from clay illitisation or allochthonous fluids of meteoric origin with delta O-18 below -5%. These results provide insights into the diagenetic history of the region and the initiation of quartz cementation during the Jurassic period, validated by dating results obtained on feldspar overgrowths.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2021)
Article
Geochemistry & Geophysics
A. Gay, C. Padron, S. Meyer, D. Beaufort, E. Oliot, S. Lallemand, B. Marcaillou, M. Philippon, J-J Cornee, E. Audemard, J-F Lebrun, F. Klingelhoefer, B. Mercier de Lepinay, P. Munch, C. Garrocq, M. Boucard, L. Schenini
Summary: Based on seismic profiles, multibeam data, and seabed grab cores acquired during the Garanti cruise in 2017, large seabed giant polygons were identified in the Grenada basin, representing the top part of an active polygonal fault system. These polygons are likely linked to volumetric contraction of sediments and creep deformation.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geology
Alexandre Cugerone, Francoise Roger, Benedicte Cenki, Emilien Oliot, Jean-Louis Paquette
Summary: Research in the Boss`ost dome of the Pyrenean Axial Zone has shown that mineralization formation is controlled by Variscan tectonics and associated with a major Variscan remobilization event. The poly-magmatic and metamorphic events in the Pyrenean Axial Zone have unclear relationships with the mineralization.
ORE GEOLOGY REVIEWS
(2021)
Article
Geochemistry & Geophysics
Mael Allard, Benoit Ildefonse, Emilien Oliot, Fabrice Barou
Summary: Crustal architecture at slow-spreading oceanic ridges is shaped by interactions between magmatism, hydrothermalism, and tectonics. Through drilling and analysis, researchers observed widespread ductile deformation and identified active slip systems in plagioclase within gabbroic lithologies. These findings suggest a complex evolution of rock fabric reflecting varying physical and chemical conditions during deformation processes.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Environmental Sciences
Anne Chabas, Wolfram Kloppmann, Jean-Pierre Sizun, Guillaume Wille, Adriana Coman, Aline Petitmangin, Sophie Nowak, Erwan Martin, Marie-Ange Jurgens
Summary: This study aims to determine the composition and source of salts found on the inner and outer wall surface of the dovecote, as well as their potential impact on the preservation of the monument. Various non-invasive methods, including microclimatic measurements, mineralogical analysis, and historical documentation, are used to investigate the causes of salt enrichment and migration.
ENVIRONMENTAL EARTH SCIENCES
(2022)
Article
Geosciences, Multidisciplinary
J. Richard, J. -P. Sizun
Summary: The study focuses on the Bonnevaux section in the Jura inner platform of France during the Middle Oxfordian period. It reveals that a sequence composed of microporous limestones can exhibit a wide range of original microfacies associated with different depositional environments. The reservoir qualities and transport properties of these microporous limestones show spatial evolution at the platform scale, with an increase in total porosity and permeability, and a decrease in trapped porosity. The increase in permeability is correlated with changes in the pore access radii and the control of meteoric pore-fluid flows by microporosity during burial diagenesis.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geography, Physical
Pedro Ramirez-Perez, Irene Cantarero, Gabriel Cofrade, Daniel Munoz-Lopez, David Cruset, Jean-Pierre Sizun, Anna Trave
Summary: The Oliana anticline has been studied as an analogue of a geothermal reservoir using field data and various analyses. Petrophysical measurements reveal that connected porosity is the main factor influencing bulk density, compressional wave velocity, and permeability. Thermal conductivity measures show a correlation between rock composition and thermal properties. This research provides valuable insights for the exploration of unconventional geothermal and CO2 storage sites in folded sedimentary successions in foreland basins.
GLOBAL AND PLANETARY CHANGE
(2023)
Article
Multidisciplinary Sciences
Pedro Ramirez-Perez, Irene Cantarero, Gabriel Cofrade, Daniel Munoz-Lopez, David Cruset, Jean-Pierre Sizun, Anna Trave
Summary: This study conducted petrophysical and petrothermal characterization of the sedimentary succession of the Oliana anticline in the Southern Pyrenees. The research aimed to understand the rock properties, the relationships between fold and petrology, and the tectonic and diagenetic controls on these properties. The findings provide insights into the potential of the study area as a geothermal reservoir.
Article
Mineralogy
Thierry Decrausaz, Marguerite Godard, Manuel D. Menzel, Fleurice Parat, Emilien Oliot, Romain Lafay, Fabrice Barou
Summary: The long-term cycling of carbon on Earth is regulated by mass transfers involving mantle rocks. Through the study of low-grade glass alteration processes along the basal thrust of the Semail Ophiolite in Oman, we found that carbonation occurred in three main stages. The iron and magnesium content of mantle rocks depends on the homogeneity and heterogeneity of the mantle rocks.
EUROPEAN JOURNAL OF MINERALOGY
(2023)
Article
Geochemistry & Geophysics
Fanny Goussin, Stephane Guillot, Gilles Ruffet, Marc Poujol, Emilien Oliot, Anne Replumaz, Carole Cordier, Guillaume Dupont-Nivet, Pierrick Roperch
Summary: This work presents new U-Pb and 40Ar/39Ar ages from the highly deformed units of the Yushu melange in the Tibetan Plateau, helping to refine the chronology of the Paleo-Tethyan oceanic subductions. The study reveals at least three successive tectono-magmatic events in the Yushu melange.
Proceedings Paper
Geology
Alexandre Cugerone, Benedicte Cenki-Tok, Emilien Oliot, Manuel Munoz, Alain Chauvet, Fabrice Barou, Kalin Kouzmanov, Stefano Salvi, Vincent Motto-Ros, Elisabeth Le Goff
LIFE WITH ORE DEPOSITS ON EARTH, PROCEEDINGS OF THE 15TH SGA BIENNIAL MEETING, 2019, VOLS 1-4
(2019)