Article
Geochemistry & Geophysics
Nicole Sequeira, Abhijit Bhattacharya
Summary: The study investigates the previously undocumented accretion dynamics of the Chottanagpur Gneiss Complex (CGC) in Eastern India through structural mapping, monazite chemical age determinations, and P-T pseudosection analyses. The results show a shallow-dipping carapace of mylonitized granitoids and anatectic basement gneisses in the northern margin of the CGC, indicating thrusting of allochthonous supracrustal rocks. The tectonic events in the CGC appear to have little correlation with those in the Capricorn Orogen and Albany Fraser Orogen in Western Australia.
Article
Geosciences, Multidisciplinary
Sergei Skuzovatov
Summary: The study suggests that the Alag Khadny complex in southwest Mongolia represents a remnant of a rifted Mesoproterozoic to Neoproterozoic continental margin, metamorphosed under high pressure conditions during the Late Neoproterozoic-Early Cambrian transition. The rocks in the complex show evidence of high-pressure metamorphic re-equilibration and mixed P-T conditions, indicating different depths of equilibration for different lithologies but a common subduction-related metamorphic evolution.
GEOSCIENCE FRONTIERS
(2021)
Article
Geosciences, Multidisciplinary
Zhen M. G. Li, Yi-Chao Chen, Qian W. L. Zhang, Jia-Hui Liu, Chun-Ming Wu
Summary: This study provides new insights on the tectonic affinity of the Kang-Dian region in the Neoproterozoic from a metamorphic perspective. The long duration of the metamorphic event in the Kang-Dian region, over 100 Ma, suggests a long-lived orogenic process rather than a super-plume scenario. The metamorphic P-T conditions indicate an extensive compressional environment with prevailing deviatoric stress, possibly a subduction zone.
PRECAMBRIAN RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Masafumi Saitoh, Nicolas Olivier, Marion Garcon, Maud Boyet, Christophe Thomazo, Julien Alleon, Jean-Francois Moyen, Vincent Motto-Ros, Johanna Marin-Carbonne
Summary: The studied sandstones in the Moodies Group of the Barberton Greenstone Belt show characteristics of fossilized microbial mats in coastal floodplain and inter- to supra-tidal environments. The presence of fine-grained laminae with clay matrix in specific settings and absence of such laminae in high-energy subtidal settings suggest different depositional conditions for the sediments.
PRECAMBRIAN RESEARCH
(2021)
Review
Environmental Sciences
Owen M. Weller, Catherine M. Mottram, Marc R. St-Onge, Charlotte Moller, Rob Strachan, Toby Rivers, Alex Copley
Summary: The similarities and differences between the Himalaya-Tibetan orogen and ancient mountain belts highlight the key factors controlling mountain building. Foreland rheology is considered a critical factor in determining the effectiveness of comparing orogens.
NATURE REVIEWS EARTH & ENVIRONMENT
(2021)
Article
Geology
Arezoo Moradi, Nahid Shabanian, Ali Reza Davoudian, Hossein Azizi, Jose Francisco Santos, Yoshihiro Asahara
Summary: The studied granitic gneiss bodies in the Golpayegan metamorphic complex in western Iran have been dated to the Late Neoproterozoic period (Ediacaran) at approximately 557 +/- 12 Ma, which is concurrent with the Neoproterozoic-Early Paleozoic basement in other parts of Iran. Geochemical analysis suggests that the protolith of the gneisses corresponds to differentiated I-type granites with subalkaline compositions. The results also indicate that the granitic source magma evolved in an active continental margin tectonic regime during the subduction of the Proto-Tethys ocean beneath the northern margin of Gondwana, similar to other contemporaneous Cadomian fragments.
INTERNATIONAL GEOLOGY REVIEW
(2022)
Article
Geochemistry & Geophysics
Youngji Ha, M. Satish-Kumar, Kye-Hun Park, Yong-Sun Song, Shuwen Liu
Summary: The age-unknown Hyangsanni Dolomite in the Okcheon metamorphic belt in central South Korea is thought to belong to the sedimentary sequence of the Neoproterozoic, deposited in a continental margin environment. Elemental and isotopic analyses suggest the influence of terrigenous materials and the presence of magmatism related to continental rifting in the deposition environment. The flat REE + Y patterns and Ce negative anomaly of the samples indicate a rift basin connected to the ocean.
Article
Geology
Jian-Feng Chen, Chun-Hua Wen, Zheng-Hang Lv, Jian-Zhong Huang, Jin-Xu Zhang, Yong Tang, Yun Du, Chuang-Hua Cao
Summary: According to the classical petrogenesis model, Li-, Cs-, and Ta-rich (LCT) pegmatites are generally formed by unidirectional successive crystallization differentiation of the common parental granitic melt. However, this model cannot explain the origin of the Mesozoic LCT pegmatites from the East Jiangnan Orogenic Belt (JOB), South China. Through the study of the geology, zircon U-Pb ages, Hf isotope compositions, monazite U-Th-Pb ages, and Nd isotope compositions of pegmatites in Renli, East JOB, South China, a new model of parallel differentiations of triple granitic melts is proposed for the origin of LCT pegmatites in South China.
ORE GEOLOGY REVIEWS
(2023)
Article
Geosciences, Multidisciplinary
Bekele Ayele Bedada, Anthony Temidayo Bolarinwa, Dereje Ayalew, Temesgen Oljira
Summary: This paper reveals the petrogenesis and geochemical nature of the rocks from the Ropi Megda area in the Bule Hora ophiolitic belt, southern Ethiopia, through ore rock geochemical and field studies.
JOURNAL OF AFRICAN EARTH SCIENCES
(2022)
Article
Geosciences, Multidisciplinary
Yong-Fei Zheng, Ren-Xu Chen
Summary: Extreme pressure-temperature conditions in crustal metamorphism produce characteristic ultrahigh-pressure (UHP) and ultrahigh-temperature (UHT) mineral assemblages at convergent plate boundaries. These assemblages play a crucial role in the generation and differentiation of continental crust through plate tectonics, as well as in mountain building. The thermal gradient of metamorphism varies in both time and space, influencing the formation of different metamorphic facies and playing a key role in the dynamics of supercontinent assembly and breakup.
Article
Geology
Tebogo Kelepile, Thierry Bineli Betsi, Elisha Shemang
Summary: This study used radiometric dating to determine the origin of the Cu-Ag deposits in the Ghanzi-Chobe Belt of Botswana's portion of the Kalahari Copper Belt and discovered multiple mineralization events. The results contribute to the understanding of the formation mechanisms of sedimentary rock-hosted Cu-Ag deposits in the Kalahari Copper Belt.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geology
I. K. Kozakov, M. O. Anosova, T. I. Kirnozova, Yu. V. Plotkina
Summary: The geochronological study of detrital zircons in the Tatsaingol block in the Neoproterozoic Southern Khangay metamorphic belt reveals two sequences of metamorphic rocks, indicating multiple metamorphic events with predominant Paleoproterozoic and Neoarchean sources. The late metamorphic episode is manifested in both sequences, suggesting a separate evolution of the Tatsaingol block from the central and northwestern parts of the Southern Khangay metamorphic belt.
STRATIGRAPHY AND GEOLOGICAL CORRELATION
(2021)
Article
Geosciences, Multidisciplinary
J. E. Andrews, M. G. Stamatakis, I. Mitsis, T. Donnelly, M. Regueiroy Gonzalez-Barros, A. E. Fallick
JOURNAL OF THE GEOLOGICAL SOCIETY
(2018)
Review
Geochemistry & Geophysics
Gaston Giuliani, Jean Dubessy, Daniel Ohnenstetter, David Banks, Yannick Branquet, Julien Feneyrol, Anthony E. Fallick, Jean-Emmanuel Martelat
MINERALIUM DEPOSITA
(2018)
Article
Geochemistry & Geophysics
J. -B. Jacob, J. -E. Martelat, P. Goncalves, G. Giuliani, J. -L. Devidal, J. Feneyrol, E. Omito, D. Ichang'I
Article
Geochemistry & Geophysics
Kandy K. Wang, Ian T. Graham, Laure Martin, Panagiotis Voudouris, Gaston Giuliani, Angela Lay, Stephen J. Harris, Anthony Fallick
Article
Geology
Alexandre Cugerone, Benedicte Cenki-Tok, Emilien Oliot, Manuel Munoz, Fabrice Barou, Vincent Motto-Ros, Elisabeth Le Goff
Article
Geosciences, Multidisciplinary
R. E. Holdsworth, D. Selby, E. Dempsey, L. Scott, K. Hardman, A. E. Fallick, R. Bullock
JOURNAL OF THE GEOLOGICAL SOCIETY
(2020)
Article
Geosciences, Multidisciplinary
Jean-Emmanuel Martelat, Herve Cardon, Jean-Marc Lardeaux, Christian Nicollet, Karel Schulmann, Eric Pili
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2020)
Article
Geosciences, Multidisciplinary
Carmen Aguilar, Pavla Stipska, Francis Chopin, Karel Schulmann, Pavel Pitra, Prokop Zavada, Pavlina Hasalova, Jean-Emmanuel Martelat
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2020)
Article
Geosciences, Multidisciplinary
Jean-Emmanuel Martelat, Javier Escartin, Thibaut Barreyre
Review
Geochemistry & Geophysics
Gaston Giuliani, Lee A. Groat, Anthony E. Fallick, Isabella Pignatelli, Vincent Pardieu
Article
Geosciences, Multidisciplinary
A. R. Prave, K. Kirsimae, A. Lepland, A. E. Fallick, T. Kreitsmann, Yu E. Deines, A. E. Romashkin, D. Rychanchik, P. Medvedev, M. Moussavou, K. Bakakas, M. S. W. Hodgskiss
Summary: The study suggests that the C-13 isotope trend of the LJE is facies-dependent rather than representative of the global carbon cycle. While open and deeper marine environments maintained stable carbon isotope values, nearshore and evaporitic environments showed higher C-13 values. Changes in C-13 values are linked to facies changes and may be related to local carbon pools.
JOURNAL OF THE GEOLOGICAL SOCIETY
(2022)
Article
Geosciences, Multidisciplinary
Valentine Puzenat, Javier Escartin, Jean-Emmanuel Martelat, Thibaut Barreyre, Sven Le Moine Bauer, Paraskevi Nomikou, Nuno Gracias, Pascal Allemand, Varvara Antoniou, Omer Coskun, Rafael Garcia, Philippe Grandjean, Steffen Leth Jorgensen, Lluis Magi, Manolis Mandalakis, William Orsi, Paraskevi Polymenakou, Anders Schouw, Guillem Vallicrosa, Othonas Vlasopoulos
Summary: This study investigated one of the most extensive shallow-water hydrothermal systems in the south of Milos, Greece using aerial drones, an AUV, and temperature measurements. The study revealed hydrothermal venting activities emitting gases and high-temperature fluids, associated with bacterial mats and hydrothermal mineral precipitates. The study also provided comprehensive mapping, characterization, and observations of the seafloor ecosystem affected by this hydrothermal activity.
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
Geochemistry & Geophysics
Marianne Metois, Jean-Emmanuel Martelat, Jeremy Billant, Muriel Andreani, Javier Escartin, Frederique Leclerc
Summary: The lab session focuses on a research project of the Roseau active fault in the Lesser Antilles, utilizing high-resolution models computed from ROV videos to link fault morphology and coseismic displacement for educational purposes. Mapping exercises and virtual fieldwork are included to provide basic understanding of active tectonics. The use of VR for virtual fieldwork is discussed, highlighting its potential as a tool to learn observational skills in Earth sciences.
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)