Article
Geochemistry & Geophysics
Quentin Masurel, Nicolas Thebaud, Andrew Allibone, Anne-Sylvie Andre-Mayer, Kim A. A. Hein, Laurie Reisberg, Olivier Bruguier, Aurelien Eglinger, John Miller
Summary: The Bonikro and Hire gold deposits in Cote d'Ivoire are associated with Paleoproterozoic tectonic and magmatic events. The mineralization at Bonikro is mainly hosted within a porphyritic granodiorite, while the mineralization at Hire is shear-hosted. Both deposits exhibit different types of gold mineralization and timing, highlighting the genetic diversity of granitoid-hosted gold mineralization in the region.
MINERALIUM DEPOSITA
(2022)
Review
Geochemistry & Geophysics
Quentin Masurel, Aurelien Eglinger, Nicolas Thebaud, Andrew Allibone, Anne-Sylvie Andre-Mayer, Helen McFarlane, John Miller, Mark Jessell, Laurent Ailleres, Olivier Vanderhaeghe, Stefano Salvi, Lenka Baratoux, Stephane Perrouty, Graham Begg, Denis Fougerouse, Patrick Hayman, Ousmane Wane, Asinne Tshibubudze, Luis Parra-Avila, Alain Kouamelan, Prince Ofori Amponsah
Summary: Studies have shown that the southern part of the West African Craton includes the Baoule-Mossi Domain, which is the world's premier Paleoproterozoic gold province. Gold mineralisation occurred during different periods spanning the Eoeburnean and Eburnean orogenic cycles, leading to the formation of various gold deposits.
MINERALIUM DEPOSITA
(2022)
Article
Environmental Sciences
Money Ossohou, Corinne Galy-Lacaux, Veronique Yoboue, Marcellin Adon, Claire Delon, Eric Gardrat, Ismael Konate, Adja Ki, Raphael Zouzou
Summary: The study presents a long-term trend analysis of atmospheric inorganic nitrogen deposition in Sub Saharan Africa from 2000 to 2015, showing decreasing trends in dry nitrogen deposition but increasing trends in wet nitrogen deposition, indicating changes in agricultural practices in the area.
ENVIRONMENTAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
Daniel Kwayisi, Jeremie Lehmann, Marlina Elburg
Summary: New data on sandstones and shales in the Buem structural unit in Ghana, including zircon ages and isotope compositions, reveal horizontal stratification and foreland basin sequences with potential sources from the Amazonian Craton, Benino-Nigerian Shield, and West African Craton.
Article
Geosciences, Multidisciplinary
Augustin Y. Koffi, Nicolas Thebaud, Alain N. Kouamelan, Lenka Baratoux, Olivier Bruguier, Olivier Vanderhaeghe, Pavel Pitra, Anthony I. S. Kemp, Noreen J. Evans
Summary: The crustal evolution in the south West African Craton was influenced by juvenile material input around 2.1 Ga, and the impact of pre-existing Archean crustal domains on the Paleoproterozoic continental mass remains unclear. The Sassandra-Cavally (SASCA) domain, located in Cote d'Ivoire, provides valuable insights into the transition between the Archean and Paleoproterozoic terranes. Zircon grains extracted from migmatitic gneisses, metasedimentary rocks, and a granitic intrusion underwent U-Pb and Lu-Hf isotopic analyses using LA-(MC-)ICP-MS. The results suggest that the migmatitic gneisses were derived from the mantle during the Paleoarchean and underwent substantial reworking in the Mesoarchean, while the metasedimentary units contain detrital zircon grains with Paleoproterozoic ages, indicating a juvenile source. The intrusion exhibits a hybrid isotopic signature, suggesting a complex geological history.
PRECAMBRIAN RESEARCH
(2022)
Article
Geochemistry & Geophysics
Dan Wang, Ross N. Mitchell, Jinghui Guo, Fulai Liu
Summary: Granulites from the North China Craton provide insights into the crustal evolution of Archean cratons and shed light on the formation and reactivation of cratons. The study reveals peak conditions for garnet formation at about 800 degrees Celsius and 10-13 kilobars and suggests that the Archean basement was also heated and buried in the Paleoproterozoic.
JOURNAL OF PETROLOGY
(2023)
Article
Geology
Cui RunZe, Wei ChunJing, Duan ZhanZhan
Summary: In this paper, detailed research on the metamorphism of the Qingyuan terrane in northern Liaoning was carried out, focusing on intermediate granulites, garnet-orthopyroxene rocks, and metabasic dykes. The results show that the intermediate granulites and garnet-orthopyroxene rocks underwent two stages of granulite facies assemblages formed during the Neoarchean and Paleoproterozoic. The first stage metamorphism followed an anticlockwise P-T path, while the second stage followed a clockwise path. The P-T conditions for these metamorphic stages were determined through mineral observations. Zircon and monazite dating further confirmed the timing of these two metamorphic events. Based on regional geological evidence, the first stage metamorphism is thought to be controlled by Archean vertical tectonics/sagduction, while the second stage is related to collisional orogenesis along the northern margin of the North China Craton.
ACTA PETROLOGICA SINICA
(2023)
Article
Geosciences, Multidisciplinary
Yuyoung Lee, Moonsup Cho, Taehoon Kim, Hyeoncheol Kim
Summary: The study of incipient charnockite and garnet-biotite-bearing granitic gneisses in the Sancheong-Hadong anorthosite complex revealed evidence of partial melting and subsequent melt crystallization, with estimated peak metamorphic conditions at 5.4-6.0 kbar and 800-850 degrees C. The U-Pb ages of zircon from both incipient charnockite and host gneiss were found to be identical, suggesting a consistent timeline of magmatic crystallization and subsequent anatexis. Monazite grains from the charnockite zone yielded ages indicating post-peak metamorphic growth at approximately 1.84 Ga, attributed to a fluid influx event in the area.
PRECAMBRIAN RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Ingrid M. Nedel, Reinhardt A. Fuck, Amarildo S. Ruiz, Gerardo R. Matos-Salinas, Alanielson da C. D. Ferreira
Summary: The Sunsas belt in Bolivia has experienced four major magmatic events at different geological periods, including the formation of granitic basement in coeval terranes, a magmatic association with various terranes, and multiple magmatic events related to orogenies. The ages obtained from monazite and zircon data suggest a complex geological evolution with evidence of multiple reworking events in the Sunsas belt.
GEOSCIENCE FRONTIERS
(2021)
Article
Geology
Zheng Gong, David A. D. Evans, Nasrrddine Youbi, Abdelhak Ait Lahna, Ulf Soderlund, Malika Ait Malek, Bin Wen, Xianqing Jing, Jikai Ding, Moulay A. Boumehdi, Richard E. Ernst
Summary: By conducting a study of the Proterozoic mafic dikes in the Anti-Atlas Belt of Morocco, researchers have provided new insights into the connection between the West African craton (WAC) and Amazonia in the supercontinent Nuna, proposing an inverted WAC-Amazonia connection and refining the configuration of Nuna. This new reconstruction is supported by global large igneous province records and highlights significant changes in the relative orientation of continental blocks from Nuna to Gondwana, illustrating large-magnitude cumulative azimuthal rotations over supercontinental cycles.
Article
Geochemistry & Geophysics
Yuyoung Lee, Moonsup Cho, Jeongmin Kim
Summary: The study on Buncheon granitic gneiss reveals the significant role of fluid-fluxed melting in the formation and modification of continental crust during high-temperature metamorphism. The presence of melts and the recrystallization of igneous protoliths are evidenced by the field, microstructural, and geochemical studies, as well as the U-Pb and oxygen isotopic analyses of zircon and monazite. The results suggest a long episode of partial melting to melt crystallization in the Yeongnam Massif, indicating the prolonged crustal reworking of the Paleoproterozoic Korean arc.
Article
Geosciences, Multidisciplinary
Peter Haas, Joerg Ebbing, Nicolas L. Celli, Patrice F. Rey
Summary: The article presents a new Moho depth model to discuss the architecture of the three main African cratonic units. The model, based on a two-step gravity inversion approach, reveals variable density contrasts and trends in Moho depth for the different cratons. Results indicate that cratonic lithosphere may have thick or thin crust, with some enigmatic discrepancies requiring further study.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Heng Peng, Jianqiang Wang, Chiyang Liu, Hongge Zhao, Lei Huang, Xiaochen Zhao, Shaohua Zhang, Chao Liang, Zhao Wang, Xiaoqin Jiao, Long Zhang, Tianbing Zhang, Dongdong Zhang, Massimiliano Zattin, Silvia Catto
Summary: The study of sedimentary hiatus and exhumation in intraplate basins is important for understanding their tectonic development, morphodynamics, and petroleum occurrence. New data from borehole samples in the Ordos Basin reveal multiple cooling events and unconformities. These findings provide insights into the basin's erosion and burial history, as well as the tectonic and climatic events in East Asia.
EARTH-SCIENCE REVIEWS
(2023)
Article
Geosciences, Multidisciplinary
Pierpaolo Guarnieri, Diogo Rosa, Kristine Thrane, Thomas F. Kokfelt, Erik Sorensen, Michelle Y. Dewolfe, Nigel Baker
Summary: A new tectonic model is presented to explain the evolution of the Paleoproterozoic Karrat Group and Rinkian orogen in central West Greenland. The Karrat Group originated in a rift basin and later evolved into a back-arc basin. The Rinkian orogen formed through arc-continent collision. Metamorphism occurred in the Karrat Group during the collisional phase, with different metamorphic grades observed in the south and north. The Rinkian orogen is characterized by extensive thrust emplacement and fold-vergence south of the Proven igneous complex.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2023)
Article
Environmental Sciences
Modeste Kacou, Eric-Pascal Zahiri, Kouakou Christian Yao, Luc Seguis, Clement Dutremble, Ehouman Serge Koffi, Jean-Louis Perrin, Amidou Dao, Angah Armel Fourier Kodji, Kouame Frejus Konan, Kouassi Tandji Tewa
Summary: In the District of Abidjan, flooding occurs suddenly during intense rainfall events. This study identified 1240 individual rainfall events between 2018 and 2021 and analyzed their characteristics such as rainfall amount, duration, and intensity. The findings showed that these events were mostly convective with an average duration of over 2 hours and rainfall of 11.30 mm/event. The probability of observing multiple events per day was high in June and October, the core of the rainy seasons.