Article
Geology
Alec M. Hutchings, Alexandra V. Turchyn
Summary: The iron speciation in ancient sedimentary rocks is crucial for reconstructing oceanic redox conditions, but post-depositional processes can skew geochemical signals. Rocks with higher total iron content are more reliable indicators of true sulfide conditions, suggesting that true euxinia in the mid-Proterozoic may have been underestimated. Marine iron and sulfate concentrations were more similar in the Proterozoic-Neoproterozoic oceans, indicating a susceptibility to post-depositional alteration and explaining the euxinia extent suggested for this time period.
Article
Geology
Johannes Zieger, Mandy Hofmann, Andreas Gaertner, Axel Gerdes, Linda Marko, Ulf Linnemann
Summary: This study presents new data on the sedimentary formations of the Namibian Huab Basin and Kunene area, providing insights into their depositional ages and environmental conditions. The results suggest that the sedimentary transport and homogenization system in southern Gondwana changed over time and depended on the prevailing climate during deposition.
Article
Chemistry, Physical
Luisa Barbieri, Fabiana Altimari, Fernanda Andreola, Bruno Maggi, Isabella Lancellotti
Summary: This research aimed to find new applications for domestically sourced volcanic products and related waste by creating a database of secondary volcanic raw materials and their characteristics. The materials can be used in lightweight aggregates for agronomic purposes or in the construction field. Pumice and lapillus can play a role in geopolymer preparation, while zeolitic tuff can be used for flue gas treatment. These materials also have applications in tile production and as supplementary cementitious material or aggregates.
Article
Geosciences, Multidisciplinary
P. Martizzi, S. Chiyonobu, Y. Hibi, H. Yamato, H. Arato
Summary: The middle-late Miocene siliceous mudstones and siltstones in Northern Honshu, Japan, provide a geological record of the paleoenvironment of the Japan Sea. Through sedimentological and geochemical analyses, it was found that the detrital fraction originated from a felsic source and was transported to the Japan Sea by monsoons and riverine input. Differences in oxygen levels in the bottom waters of the Tsugaru Basin and the Sugisawa area led to variations in organic carbon accumulation patterns.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Charles Gianfriddo, Stuart Bull
Summary: The McArthur Basin in northern Australia is economically significant due to its world-class stratiform Zn-Pb deposits and high potassium concentrations. The development of authigenic K-feldspar during low temperature brine reflux is suggested as a potential indicator for the formation of similar mineralization. Regional fluid flow patterns are found to be consistent with the tectono-sedimentary evolution of Proterozoic northern Australia.
PRECAMBRIAN RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Liang Qi, Yajun Xu, Peter A. Cawood, Hangchuan Zhang, Zukun Zhang, Yuansheng Du
Summary: The study suggests that the tectonic record of mid-late Neoproterozoic magmatism in the South China Block reveals a transition from a convergent plate margin setting on the periphery of Rodinia to within-plate extension at around 750 Ma. The geochemical characteristics of the rocks indicate crustal assimilation and fractional crystallization played a significant role in magma evolution. Detrital zircons from the samples present ages that suggest a peripheral setting for South China with respect to the supercontinent and most likely adjacent to India starting from at least 750 Ma.
PRECAMBRIAN RESEARCH
(2021)
Article
Geochemistry & Geophysics
Arathy Ravindran, Klaus Mezger, S. Balakrishnan, Jasper Berndt, Sameer Ranjan, Dewashish Upadhyay
Summary: Combining U-Pb zircon ages with Hf-Sr-Pb isotopes, this study provides insights into the petrogenetic evolution of the continental crust in the western Dharwar Craton, India. The research reveals the presence of the oldest felsic crustal material in the region, and the formation of major felsic continental crust during a specific time interval. The study also suggests that the Mesoarchean felsic crust in the Dharwar Craton was formed through differentiation of melts from different source rocks and incorporated reprocessed crustal material over time.
Article
Geosciences, Multidisciplinary
Sebastien Owona, Lothar Ratschbacher, Moussa Nsangou Ngapna, Afzal Muhammad Gulzar, Joseph Mvondo Ondoa, Georges Emmanuel Ekodeck
Summary: The Nyong Complex and the Yaounde Group in Cameroon represent two different crustal sequences with distinct depositional ages and sources, influenced by the Pan-African orogeny. The Nyong Complex likely sourced from the Meso-Neoarchean Congo Shield around 2.8 Ga, while the Yaounde Group lacks a major Archean source and has sources from the Eburnean and Tonian-Cryogenian events. Both units share a Pan-African orogenic overprint, highlighting the limited source diversity of these old basin deposits.
PRECAMBRIAN RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Wanwan Hu, Pengfei Li, Min Sun, Inna Safonova, Yingde Jiang, Chao Yuan, Pavel Kotler
Summary: Understanding the amalgamation of multiple arc systems in the Central Asian Orogenic Belt is crucial for understanding its accretion processes. This study focuses on the collision of the Siberian margin and the Kazakhstan collage along the Char Shear/Suture Zone in eastern Kazakhstan. The analysis of detrital zircons reveals distinct sedimentary provenances between the Irtysh-Zaisan Complex and the Zharma-Saur Arc/Char Zone, confirming their tectonic boundary. These findings provide insights into the closure of the Ob-Zaisan Ocean and the accretion history of the Central Asian Orogenic Belt.
JOURNAL OF ASIAN EARTH SCIENCES
(2022)
Article
Geology
Li ZhongYao, Ding HuiXia, Yuan Yue, Zhang ZeMing
Summary: The Gangdese magmatic arc in southern Tibet formed during Mesozoic subduction of the Neo-Tethyan oceanic lithosphere and was later affected by Cenozoic magmatism and metamorphism. Petrological and geochronological studies in the Tianxing area of the arc revealed high-pressure and medium-pressure granulite-facies metamorphism, indicating different crustal components. The Late Cretaceous accretion and loading of mantle-derived magma resulted in crustal growth, thickening, and underthrusting of the arc, transforming the lower arc crust to andesitic one through downward transportation of upper crustal felsic magmatic rocks and sedimentary rocks.
ACTA PETROLOGICA SINICA
(2021)
Article
Geosciences, Multidisciplinary
Dongfang Song, Wenjiao Xiao, Brian F. Windley, Chunming Han
Summary: The study investigates the provenance and tectonic setting of late Paleozoic sedimentary rocks in the southern Central Asian Orogenic Belt through detrital zircon geochronological data. It reveals different age peaks in samples from the Devonian, Carboniferous, and Permian, indicating magmatic flare-ups and shifts in detritus sources. The data suggest an archipelago-style accretionary process during the late Paleozoic tectonic evolution of the southern Central Asian Orogenic Belt.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2021)
Article
Geosciences, Multidisciplinary
Xinghua Ni, Bo Wang, Dominique Cluzel, Jiashuo Liu, Zhiyuan He
Summary: This study conducted field investigations and LA-ICP-MS zircon U-Pb dating on metamorphic rocks in the Julideneng Metamorphic Complex in the Harlik Range, proposing new insights into the late Paleozoic tectonic evolution in the region. The research suggests that the meta-sedimentary rocks and migmatites in the JMC were formed during the late Silurian to late Carboniferous, with detrital zircons potentially derived from the Central Tianshan Block. The migmatization and granitic plutonism in the JMC likely occurred around 322-297 Ma, possibly related to crustal thinning.
JOURNAL OF ASIAN EARTH SCIENCES
(2021)
Review
Geography, Physical
Antonio Rodriguez-Ramirez, Jose N. Perez-Asensio, Juan J. R. Villarias-Robles
Summary: The analysis of drill cores, geomorphic patterns, and radiocarbon assays on mollusk shells from La Algaida spit in SW Spain provides insights into the formation and evolution of a sandy barrier influenced by tectonic activities in the Guadalquivir estuary. The asymmetry between the eastern La Algaida spit and the western Don similar to ana spit, in terms of subsidence processes, leads to different sedimentary formations and landforms in the area.
Article
Geology
Yalcin E. Ersoy, Ibrahim Uysal, Osman Candan, Martin R. R. Palmer, Dirk Mueller
Summary: In eastern Anatolia, the Divrigi-Hekimhan Magmatic Province (DHMP) consists of alkaline rock units formed 77-69 million years ago, located to the northwest of the Baskil Arc formed 85-74 million years ago. These rocks are composed of different types, including basaltic, trachytic, and syenitic rocks, with varying mineral compositions. Geochemical analysis indicates that the magmas originated from a shallow asthenospheric mantle source, which had undergone metasomatism due to subduction processes.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geosciences, Multidisciplinary
Pawel Wolniewicz
Summary: This paper suggests a broad utilization of petrographic, mineralogical, and palaeontological elements for geological heritage conservation and geoscience communication. By evaluating and promoting geological features with educational potential, the number of geological tourism destinations can be increased.
