Article
Geochemistry & Geophysics
Oscar Laurent, Simon Couzinie, Luc S. Doucet
Summary: The study reveals the timescales of lower crustal ultra-high temperature metamorphism and the production and transfer of granitic magmas. Zircon petrochronology of felsic and mafic granulite xenoliths from the Variscan eastern French Massif Central shows that these rocks underwent Variscan UHT peak metamorphism at 940-970°C and 8±2 kbar. The zircon U-Pb dates of the felsic granulites range from -315 to -265 Ma, indicating continuous crystallization of zircon upon cooling from the thermal peak. The emplacement of upper crustal granite started at 340 Ma and peaked at 313±3 Ma, reflecting melt extraction along the prograde path of the lower crust. The crystallization ages of mid-crustal migmatites (315-300 Ma) and lower crustal granulites (315-265 Ma) suggest slow cooling in the presence of melt.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Dov Avigad, Avishai Abbo, Axel Gerdes, Axel K. Schmitt
Summary: The study focuses on detrital zircon from the black sand of the Rhone River delta in southern France, which provides important insights into the major episodes of European magmatism. The results show that the black sand samples represent magmatic events at 0.55 Ga (Cadomian), 0.45 Ga (Cenerian), and 0.31 Ga (Variscan). The Hf isotopes in the zircon suggest the involvement of continuous crustal reworking during European magmatic episodes. However, the oxygen isotope analysis indicates the presence of a significant sedimentary component in the genesis of European granitoids. The study concludes that the prevalent Hf-T-DM ages obtained are mixed and do not confirm the reworking of Mesoproterozoic crust in the region.
Article
Geosciences, Multidisciplinary
Stephen Collett, Karel Schulmann, Pierig Deiller, Pavla Stipska, Vit Peresty, Marc Ulrich, Yingde Jiang, Luc de Hoym de Marien, Jitka Mikova
Summary: This article investigates the high-pressure and high-temperature metamorphism during the Mid-Devonian period in the Variscan Orogeny, focusing on the geological characteristics of the Marianske Lazne Complex (MLC). The unique position of MLC at the base of its original upper plate is highlighted. The study reveals that both MLC and the upper plate developed above a relatively unaltered Neoproterozoic lithospheric mantle, which is important for reconstructing the original architecture of the Variscan terranes.
GEOSCIENCE FRONTIERS
(2022)
Article
Geosciences, Multidisciplinary
Justin L. Payne, Laura J. Morrissey, Naomi M. Tucker, Lisa K. Roche, Michael A. Szpunar, Regis Neroni
Summary: The study revealed three previously unrecognized Mesoproterozoic magmatic events in the Rudall Province of Western Australia, and established correlations with the Musgrave Province and Albany-Fraser Orogeny. These findings support the theory of gradual amalgamation of continental fragments over a specific period of time.
PRECAMBRIAN RESEARCH
(2021)
Article
Geochemistry & Geophysics
Christophe Ballouard, Simon Couzinie, Pierre Bouilhol, Matthieu Harlaux, Julien Mercadier, Jean-Marc Montel
Summary: The Velay anatectic dome in the Variscan French Massif Central provides an ideal natural laboratory for studying the behavior of rare metals and fluxing elements during crustal melting. Through geochemical analysis and modeling, the study reveals the factors that affect the Li and F contents of granitic melts, such as melting pressure, temperature, H2O activity, and protolith composition. It also demonstrates that peraluminous orthogneiss anatexis can generate melts enriched in both F and Li, which can evolve into rare-metal granite compositions through fractional crystallization.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2023)
Article
Geochemistry & Geophysics
C. J. Spencer, A. J. Cavosie, T. R. Morrell, G. M. Lu, J. Liebmann, N. M. W. Roberts
Summary: By comparing the oxygen isotope records of detrital and igneous zircons, it was found that there is a missing component of high oxygen isotope values derived from igneous rocks that have been eroded over the past 4.4 billion years. This challenges the current paradigm of Archean magmatism and questions the accuracy of detrital zircon records in reflecting the composition of the bulk continental crust.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geochemistry & Geophysics
Fernando Bea, Irene Morales, Jose Francisco Molina, Pilar Montero, Aitor Cambeses
Summary: This study investigates the reasons and characteristics of zircon inheritance in granitoids, revealing the significant influence of source composition, temperature, pressure, water content, etc., on zircon survival. Mid-crustal S-type granites with high water content exhibit elevated zircon inheritance, while water-poor granites may inherit less zircon.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2021)
Article
Geochemistry & Geophysics
Omar Bartoli, Bruna B. Carvalho
Summary: Anatectic granites are products of crustal maturation by partial melting, and understanding their origin is crucial for understanding continental crust formation and evolution. This study compares melt compositions obtained from different tools, models the effects of various factors on melt composition, and compares the results with previous studies to verify systematic compositional differences and similarities.
Article
Geochemistry & Geophysics
Kun Zhou, Yi-Xiang Chen, Yong-Fei Zheng
Summary: In this study, the effects of source composition and melting conditions on the composition of syn-exhumation granitic rocks were investigated using zircon and titanite U-Pb geochronology and whole-rock geochemistry. The results show that the Weihai granites are derived from decompressional melting of the lower crustal slice at greater depth, while those from the Lanshan area are derived from decompressional melting of the upper crustal slice at relatively shallower depth.
Article
Geochemistry & Geophysics
Wen-Xiang Zhang, Yuan-Bao Wu, Guang-Yan Zhou, Yu He, Xiao-Chi Liu, Pan Hu, Huan Chang, Cheng-Yi-Hong Liu
Summary: The study reveals different evolutionary histories of migmatites and post-collisional granites in the southern segment of the Tongbai orogen based on zircon ages, suggesting a complex crustal evolution with two distinct structural layers, possibly related to the Neoproterozoic rift shoulder.
Article
Geochemistry & Geophysics
James B. Chapman, Cody Pridmore, Kevin Chamberlain, Gordon Haxel, Mihai Ducea
Summary: The study reveals that crustal melting occurred in the southern US and northern Mexican Cordillera during the Laramide orogeny. Analysis of the Pan Tak Granite from the Coyote Mountains core complex in southern Arizona suggests a sequence of prograde metamorphism, melting, and crystallization from 62 to 42 Ma. The study also identifies other geochemical and petrological characteristics related to this orogeny.
JOURNAL OF PETROLOGY
(2023)
Article
Geochemistry & Geophysics
Shu-Hui Ren, Qin Chen, Yun-Chuan Zeng, Ji-Feng Xu, Ming-Jian Li, Feng Huang, Mingda Lv
Summary: This paper presents geochemical and geochronological data for granites emplaced in the Asuo area within the central Lhasa Terrane of the Tibetan Plateau, confirming that these granites were derived from a pure sedimentary source and proposing a possible mechanism for their formation in a continental extensional setting.
Article
Geosciences, Multidisciplinary
Jack E. Stirling, Anthony I. S. Kemp, Steven W. Denyszyn
Summary: The article investigates the geological history and formation process of the Cordilleran Bega Batholith, the largest I-type granite batholith in the Lachlan Fold Belt of southeastern Australia. By determining the geochronological ages of different plutonic rocks, it was found that these rocks have a long duration of formation, large overall volume, and continuity with other types of granites, suggesting a common source.
Article
Geosciences, Multidisciplinary
Felix Djerossem, Armin Zeh, Moussa Isseini, Olivier Vanderhaeghe, Julien Berger, Jerome Ganne
Summary: The study presents the first combined U-Pb ages and Lu-Hf isotope data of zircon grains from the southern Ouaddai area in Eastern Chad, providing insights into the crustal accretion and reworking history. The results indicate multiple magmatic events and metamorphic processes that shaped the geological evolution of the region.
PRECAMBRIAN RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Min Gao, Zhen-Jie Zhang, Qiu-Ming Cheng, Djordje Grujic
Summary: The Huai'an Complex in the North China Craton consists of TTG gneisses and granite intrusive bodies. Zircon U-Pb ages reveal three episodes of magmatism from 2.6-2.3 Ga, 2.0-1.7 Ga, and similar ages around 2.3-2.0 Ga, indicating different magma sources. The complex underwent crustal growth and reworking stages from 3.1-2.5 Ga to 1.95-1.7 Ga, with tectonic processes of compression-extension-compression during 2.6-1.7 Ga.
Article
Geosciences, Multidisciplinary
Gaetano Ortolano, Eugenio Fazio, Roberto Visalli, G. Ian Alsop, Mario Pagano, Rosolino Cirrincione
JOURNAL OF STRUCTURAL GEOLOGY
(2020)
Article
Geosciences, Multidisciplinary
G. Ortolano, R. Visalli, E. Fazio, P. Fiannacca, G. Godard, A. Pezzino, R. Punturo, V Sacco, R. Cirrincione
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2020)
Article
Computer Science, Information Systems
Gaetano Ortolano, Alberto D'Agostino, Mario Pagano, Roberto Visalli, Michele Zucali, Eugenio Fazio, Ian Alsop, Rosolino Cirrincione
Summary: ArcStereoNet is a new stereographic projection toolbox based on ArcGIS(R) and implemented using Python 2.7. It allows for flexible application of statistical methods, provides high-quality graphic outputs, and has an intuitive GUI interface.
ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION
(2021)
Article
Computer Science, Information Systems
Roberto Visalli, Gaetano Ortolano, Gaston Godard, Rosolino Cirrincione
Summary: The new Micro-Fabric Analyzer (MFA) utilizes X-ray and optical image features for quantitative extrapolation of rock microstructural features, allowing for more comprehensive analysis compared to traditional edge mineral grain detectors. The MFA toolbox enables low-cost and user-friendly quantification of mineral types, integrated with micro-X-ray maps for extrapolating elemental distribution maps.
ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION
(2021)
Article
Geochemistry & Geophysics
Jean-Francois Moyen, Vojtech Janousek, Oscar Laurent, Olivier Bachmann, Jean-Baptiste Jacob, Federico Farina, Patrizia Fiannacca, Arnaud Villaros
Summary: This paper discusses the two competing paradigms regarding the formation of granitic magmas and their implications, emphasizing that both views are based on a large body of evidence and propose that each of them is relevant to some portions of the Earth.
Article
Geosciences, Multidisciplinary
Patrizia Fiannacca, Damiano Russo, Eugenio Fazio, Rosolino Cirrincione, Manish A. Mamtani
Summary: The Serre Batholith in Central Calabria represents the intermediate portion of late Variscan continental crust, with upper levels composed of two-mica granodiorites and granites, and lower levels of weakly peraluminous granodiorites. The granitoid rocks in the batholith exhibit deformation microstructures due to tectonic stresses, with a magnetic foliation showing a shortening axis oriented NW-SE. Ongoing studies aim to further investigate the relationship between regional tectonic structures and the emplacement of the late-Variscan Serre Batholith granitoids.
Article
Geosciences, Multidisciplinary
Eugenio Fazio, Patrizia Fiannacca, Damiano Russo, Rosolino Cirrincione
Article
Geochemistry & Geophysics
R. Lombardo, P. Fiannacca, R. Cirrincione
Article
Geosciences, Multidisciplinary
Patrizia Fiannacca, Rosolino Cirrincione
Article
Geosciences, Multidisciplinary
Gaetano Ortolano, Alberto D'Agostino, Roberto Visalli, Rosolino Cirrincione
RENDICONTI ONLINE SOCIETA GEOLOGICA ITALIANA
(2019)
Article
Geosciences, Multidisciplinary
Rosalda Punturo, Gaetano Ortolano, Roberto Visalli, Salvatore Caffo, Carmelo Ferlito, Rosolino Cirrincione
RENDICONTI ONLINE SOCIETA GEOLOGICA ITALIANA
(2019)