Article
Geology
Dillon A. Brown, Alexander Simpson, Martin Hand, Laura J. Morrissey, Sarah Gilbert, Renee Tamblyn, Stijn Glorie
Summary: This study used innovative in situ laser-ablation ICP-MS/MS Lu-Hf geochronology to reveal the metamorphic history of metapelitic rocks in southern Australia and their relationship with Laurentia and East Gondwana.
Article
Geology
Lorraine Tual, Matthijs A. Smit, Ellen Kooijman, Melanie Kielman-Schmitt, Lothar Ratschbacher
Summary: This article investigates the REE systematics in high-grade rocks and explores the chemical equilibrium between garnet and accessory minerals under different conditions. The study finds that co-genetic garnet and accessory minerals can achieve REE equilibrium during growth, but the age and compositional record of co-genetic accessory minerals are distinctly different between different cases. The findings provide an improved framework for the reliable identification of accessory minerals that equilibrated with garnet.
JOURNAL OF METAMORPHIC GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Tian Zhou, Reiner Klemd, Soenke Brandt, Yu Liu, Qiu-Li Li
Summary: This study conducted in situ geochronological research on the Central Zone of the Limpopo Belt in southern Africa. By analyzing monazite and zircon grains, the timing and duration of three metamorphic events in this region were determined.
PRECAMBRIAN RESEARCH
(2022)
Article
Geochemistry & Geophysics
Elizabeth M. Bollen, Harold H. Stowell, Ruth F. Aronoff, Sara Stotter, Christopher G. Daniel, Christopher R. M. McFarlane, Jeffrey D. Vervoort
Summary: In this study, garnet compositional zoning and monazite U-Pb ages were used to explain the differences in garnet Sm-Nd and Lu-Hf ages for low- to mid-amphibolite facies rocks from the Picuris and Tusas Mountains, New Mexico. It was found that most garnets preserve primary compositions and have indistinguishable ages of around 1400 Ma, but some samples show discrepancies between Lu-Hf and Sm-Nd ages, which may be caused by primary zoning in garnet, diffusion modification, or disequilibrium. The study also redefines the youngest extent of amphibolite facies metamorphism during the Picuris orogeny.
JOURNAL OF PETROLOGY
(2022)
Article
Geology
Yiting Zhu, Xiaofeng Li, Zufu Li
Summary: The Songshan tin deposit in Western Yunnan, southwestern China, is formed in the late Cretaceous. The study provides age data and isotopic analysis to reveal the formation age and source region of the Pinghejie granitic pluton, and proposes hypotheses on the genesis of the Songshan tin deposit.
ORE GEOLOGY REVIEWS
(2022)
Article
Geochemistry & Geophysics
Qiong-Xia Xia, Yi-Xiang Chen, Ren-Xu Chen, Yong-Fei Zheng
Summary: The elevated Hf isotope compositions of peritectic zircons in anatectic granites do not accurately reflect the Hf isotope composition of parental rocks, due to the decomposed minerals with high Lu/Hf ratios during crustal anatexis. Care must be taken when using Hf isotope ratios to trace the nature of parental rocks with respect to magmatic processes and crustal evolution.
Article
Geochemistry & Geophysics
Guohui Hu, Wei-(RZ) Wang, Wenjiao Xiao, Chunjing Wei, Yue Zhao, Jiangnan Liu
Summary: Studies on leucogranite dykes in the Chinese Altai orogenic belt reveal they are peraluminous S-type granites formed in the Early Permian period, with low-temperature characteristics and associated with high-grade metamorphic rocks.
Article
Geology
Yan Yang, Chenyue Liang, Franz Neubauer, M. Santosh, Jan D. Kramers, Changqing Zheng, Huiming Zhang
Summary: This study re-evaluates the Central Zone of the Limpopo Belt in southern Africa, revealing early Precambrian tectonic processes. Based on petrology, U-Pb zircon ages, and major and trace element data of high-pressure mafic granulites in the Sand River area, the research identifies protoliths formed at a mid-ocean ridge around 2.8 Ga. Three metamorphic stages are recognized in the studied samples, indicating a clockwise P-T path and important information about Neoproterozoic collisional orogeny, independent orogeny, and subsequent exhumation and cooling. U-Pb zircon dating shows protolith formation prior to 2.72 Ga and metamorphic ages of 2.72 Ga (peak) and 2.0 Ga (post-peak cooling) for the mafic granulites. The metamorphic evolution reconstructed in this study suggests a Neoarchean collision between the Kaapvaal and Zimbabwe cratons, followed by a discrete Paleoproterozoic orogenic overprint and post-orogenic exhumation and cooling.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geosciences, Multidisciplinary
Pavla Stipska, Vit Peresty, Igor Soejono, Karel Schulmann, R. C. Andrew Kylander-Clark, Carmen Aguilar, Stephen Collett, Martin Racek, Jitka Mikova, Otgonbaatar Dorjsuren, Nikol Novotna
Summary: This study investigates the accretionary orogenic processes occurring at the periphery of the Rodinia supercontinent after its assembly. Metamorphic rocks in the Mongolia collage of the Central Asian Orogenic Belt are studied to fill the knowledge gap. It is found that the tectono-metamorphic evolution was mainly characterized by the late Proterozoic-early Cambrian cycle, but a Tonian age metamorphism is documented in the northern part of the Precambrian Baidrag block.
GEOSCIENCE FRONTIERS
(2023)
Article
Geology
Leonardo Casini, Matteo Maino, Antonio Langone, Giacomo Oggiano, Stefania Corvo, Joan Reche Estrada, Montserrat Liesa
Summary: This study provides detailed research on the migmatization process in the Punta Bianca area of Italy, revealing two main stages of partial melting and their correlation with regional crustal shearing. The results shed light on the evolution history of rock metamorphism in the region, contributing to a better understanding of the geological processes in the area.
JOURNAL OF METAMORPHIC GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Victor Kovach, Ivan Kozakov, Alfred Kroener, Ekaterina Salnikova, Kuo-Lung Wang, Hao-Yang Lee, Julia Plotkina, Boris Gorokhovsky, Elena Adamskaya, Elena Tolmacheva, Lidiya Shpakovich
Summary: This study presents new geological, geochronological, geochemical, and Nd-Hf isotopic data for the Melange Zone within the Zavkhan terrane in Mongolia and discusses the terrane structure, early Neoproterozoic continental crust growth, and microcontinent formation in the north-central part of the Central Asian Orogenic Belt. The findings imply that the Zavkhan terrane is a composite terrane consisting of different complexes separated by a Melange Zone.
Article
Geosciences, Multidisciplinary
Xin Zhang, Pei Ni, Guoguang Wang, Dingsheng Jiang, Renzhi Zhu, Yaohui Jiang, Fangyue Wang
Summary: The Qin-Hang suture belt in South China formed during the Neoproterozoic amalgamation between the Cathaysia and Yangtze blocks. This study reports geochemical and zircon trace element data for Cu deposits in the region, identifying geochemical indexes for ore-related intrusion mineralization potential. Results indicate Neoproterozoic two-stage Hf model ages as positive indicators of Jurassic Cu mineralization potential, with granitoids high in Th/Yb ratios and zircon Ce/Ce* and Ce/Nd values suggesting potential for large to giant Cu deposits.
Article
Geochemistry & Geophysics
Aparupa Banerjee, Proloy Ganguly, Kaushik Das, Nilanjana Sorcar, Sankar Bose
Summary: This study focuses on a suite of high-grade and medium-grade rocks in the Angul domain at the northern margin of the Proterozoic Eastern Ghats Province (EGP). Petrological and geothermobarometric data reveal two distinct metamorphic events and associated magmatism. The findings provide insights into the metamorphic history and geological evolution of the Angul domain and its relationship with the rest of the EGP.
JOURNAL OF PETROLOGY
(2023)
Article
Geosciences, Multidisciplinary
Linxi Wang, Ning Huo, Guanzhe Jiang, Chao Han, Jingxian Sun, Hu Huang
Summary: The Central Asian Orogenic Belt (CAOB) is one of the largest accretionary orogens in the world. The development of laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) has led to the publication of large data sets on detrital zircon U-Pb and Hf isotopes, which has greatly improved our understanding of the tectonic evolution and geodynamics of the CAOB. We compiled and checked these data, which can support future research on the CAOB, such as provenance analysis, climate changes, and paleogeographic reconstruction.
GEOSCIENCE DATA JOURNAL
(2023)
Article
Geology
Chen YouXin, Zhu ShengQiang, Pei XianZhi, Wang Meng, Zhou Hai, Li ZuoChen, Li RuiBao
Summary: This study presents a systematic analysis of the geochemical characteristics and age dating of garnet amphibolite and its surrounding rocks in the Yili Block. The results suggest that the garnet amphibolite originated in the Middle to Late Neoproterozoic and experienced high amphibolite facies metamorphism. This study also indicates that the Yili Block may be a continental fragment separated from the Tarim Block during the Middle to Late Neoproterozoic.
ACTA PETROLOGICA SINICA
(2022)
Article
Geosciences, Multidisciplinary
Uri Shaanan, Dov Avigad, Navot Morag, Talip Gungor, Axel Gerdes
Summary: The Cenozoic geodynamics of the northeastern Mediterranean Basin have been influenced by the subduction of the African Plate under Eurasia, leading to the formation of the Misis-Kyrenia Thrust System which dissects the structural pattern of northern Cyprus. The detrital zircon and rutile U-Pb geochronology analysis of the Kythrea flysch revealed two different sediment transportation systems over different geological periods, providing insights into the source areas and characteristics of the sediments.
Article
Geology
J. Zieger, M. Stutzriemer, M. Hofmann, A. Gaertner, A. Gerdes, L. Marko, U. Linnemann
Summary: Detrital U-Pb zircon age dating and grain morphometrics were used to determine provenance and maximum deposition age in the Lower Permian Dwyka and Middle to Upper Permian Ecca groups in southern Namibia. The results show multiple detrital zircon age populations from different geological periods, suggesting a Gondwana-wide recycling system and significant ash fall input during the Permian. Additionally, the study reveals the evolution duration of the Karasburg and Aranos Basins, with the oldest datable unit from the Dwyka Group having a maximum deposition age of approximately 296 Ma.
INTERNATIONAL GEOLOGY REVIEW
(2021)
Article
Geosciences, Multidisciplinary
Navot Morag, Dov Avigad, Axel Gerdes, Avishai Abbo
Summary: The Miocene continental basins in Israel and Jordan preserve remnants of a continental-wide fluvial system originating in Arabia, with distinct sedimentary provinces in the north and south showing differences in detrital zircon age spectra. The detrital zircon U-Pb-Hf signal of the Israeli Miocene clastic units differs from that of the River Nile, indicating separate fluvial systems on the eastern side of the Red Sea and the western side drained by the River Nile.
Article
Geochemistry & Geophysics
Raul O. C. Fonseca, Lina T. Michely, Maria Kirchenbaur, Julie Prytulak, Jeffrey Ryan, Kerstin Hauke, Felipe P. Leitzke, Renat R. Almeev, Chris S. Marien, Axel Gerdes, Rico Schellhorn
Summary: The Izu-Bonin-Mariana volcanic arc, formed as a result of subduction initiation at a convergent plate margin, features unusual globular textures in andesitic glass within the forearc basalt stratigraphy. Detailed analysis of these samples show that the globular andesites likely formed from the assimilation of shallowly altered oceanic crust during forearc basaltic magmatism, introducing radiogenic Sr and heavier B isotopes. This process may have led to significant trace element and stable isotope fractionation, suggesting the need for further experimental studies on this phenomenon.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2021)
Article
Geochemistry & Geophysics
Damaris Montano, Marta Gasparrini, Axel Gerdes, Giovanna Della Porta, Richard Albert
Summary: The Nordlinger Ries Crater in Southwest Germany, formed by a meteorite impact in the Miocene, provides a well-established geological framework for studying lacustrine carbonate using U-Pb LA-ICPMS method. The study demonstrates the accuracy and potential of this method in determining the timing of sedimentation in lacustrine systems.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geosciences, Multidisciplinary
Caue R. Cioffi, Vinicius T. Meira, Ricardo I. F. Trindade, Pierre Lanari, Carlos E. Ganade, Axel Gerdes
Summary: This study investigates the intracontinental deformation in the Borborema Province of Northeast Brazil, finding through thermodynamic modeling and petrochronology that the deformation lasted until at least 530-525 Ma and was influenced by high geothermal gradient conditions.
PRECAMBRIAN RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Andreas Gaertner, Mandy Hofmann, Johannes Zieger, Anja Sagawe, Rita Krause, Marika Stutzriemer, Subani Gesang, Axel Gerdes, Linda Marko, Cristiano Lana, Ulf Linnemann
Summary: Extensive morphological and age studies on detrital zircon grains from modern sands of Namibia reveal complex mechanisms of sediment transport. A large Southern Namibian Sediment Vortex and a modified model of the Orange River sand highway are hypothesized based on the results of this study. The potential impact of spatial variations of erosion rates on sediment movements towards the interior of the continent is also highlighted. Additionally, detrital zircon morphology and large geo-databases are identified as valuable tools for provenance analysis.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2022)
Article
Geosciences, Multidisciplinary
David Cruset, Jaume Verges, Nuno Rodrigues, Jorge Belenguer, Enric Pascual-Cebrian, Ylenia Almar, Irene Perez-Caceres, Chiara Macchiavelli, Anna Trave, Aratz Beranoaguirre, Richard Albert, Axel Gerdes, Gregoire Messager
Summary: The study combines structural analysis of fractures with 22 U-Pb dates measured in fracture-filling carbonate cements from different types of veins and faults, providing insights into the relationships between overpressures caused by hydrocarbon generation and Andean compression as mechanisms for natural fracturing and vein formation. Multiple generations of fibers have been identified, each with distinct characteristics and ages, suggesting different formation mechanisms and periods.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Environmental Sciences
Namam Salih, Howri Mansurbeg, Philippe Muchez, Axel Gerdes, Alain Preat
Summary: The research suggests that Upper Cretaceous carbonates along the Zagros thrust-fold belt Harir-Safin anticlines were influenced by extensive hot brine fluids resulting in the formation of saddle dolomites. Additionally, detailed fluid inclusion microthermometry data indicates two entrapment episodes of early and late fluid inclusions, linked to fault-related fractures and low saline fluids respectively.
Article
Geology
Bidyananda Maibam, Richard M. Palin, Axel Gerdes, Richard W. White, Stephen Foley
Summary: The tectonic significance of blueschist-facies rocks associated with the Indo-Myanmar ophiolite belt is uncertain due to the lack of detailed petrological study and reliable age data. This study presents new petrological and geochronological data from the Nagaland complex, northeast India, which provide constraints on the pressure-temperature conditions and ages of metamorphism. The results suggest that the region experienced high-pressure prograde-to-peak metamorphism followed by lower-pressure retrograde metamorphism, with peak metamorphism dated at approximately 95 Ma and retrograde metamorphism at approximately 90 Ma. The study also indicates an exhumation rate of approximately 1 cm/year, consistent with Phanerozoic plate tectonic rates.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Multidisciplinary Sciences
Daniel Munoz-Lopez, David Cruset, Jaume Verges, Irene Cantarero, Antonio Benedicto, Vinyet Baques, Xavier Mangenot, Richard Albert, Axel Gerdes, Aratz Beranoaguirre, Anna Trave
Summary: This study applies U-Pb dating and geochemical analysis to fracture-filling calcite veins and host carbonates from the Boixols-Sant Corneli anticline in the Southern Pyrenees. The analysis provides insights into the absolute timing of fracturing and mineralization, the age and duration of fold evolution, and the variations and implications of fluid behavior across the anticline.
Article
Geology
Luca Barale, Carlo Bertok, Anna d'Atri, Fabrizio Plana, Stefano M. Bernasconi, Gyorgy Czuppon, Lazlo Palcsu, Axel Gerdes, Daniel Birgel, Luca Martire
Summary: In the Maritime Alps, the carbonate rocks of the Provencal Domain underwent intense hydrothermal dolomitization, which was the result of large-scale hydrothermal circulation related to deep faults. New carbonate U-Pb dating and geochemical analysis provided insights into the timing and mechanisms of the hydrothermal circulation.
Article
Chemistry, Analytical
Zhi-Min Tang, Xu-Dong Che, Yue-Heng Yang, Fu-Yuan Wu, Ru-Cheng Wang, Jin-Hui Yang, Axel Gerdes, Ze-Ying Zhu, Feng Liu, Chang Zhang
Summary: Columbite-group minerals (CGMs) with high Hf contents are suitable for Lu-Hf isotope analysis, providing insights into their sources in rare-metal deposits. The study evaluated the impact of tantalum on Hf isotope measurements and proposed improved analytical methods for accurate results.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2021)
Article
Chemistry, Analytical
David Evans, Axel Gerdes, Douglas Coenen, Horst R. Marschall, Wolfgang Mueller
Summary: The study showcases a precise and accurate method for measuring boron isotopic composition in natural samples, offering valuable information about formation environments and crystallization mechanisms. Building multi-standard calibration lines to correct for interferences facilitates accurate and precise spatially-resolved delta B-11 measurements across a variety of sample matrices.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2021)
Article
Environmental Sciences
Charlotte Prud'homme, Giancarlo Scardia, Hubert Vonhof, Damien Guinoiseau, Saida Nigmatova, Jens Fiebig, Axel Gerdes, Renee Janssen, Kathryn E. Fitzsimmons
Summary: Analyzing sediments from Charyn Canyon, Kazakhstan, researchers found that late Cenozoic variation in Central Asian hydroclimate was driven by the interaction between mid-latitude westerlies and the Siberian high-pressure system, potentially leading to terrestrial feedbacks affecting ocean and atmospheric circulation, highlighting the significance of land-water feedbacks for long-term global climate.
COMMUNICATIONS EARTH & ENVIRONMENT
(2021)
Article
Geochemistry & Geophysics
Xinze Lu, Geoffrey J. Gilleaudeau, Brian Kendall
Summary: The Late Ordovician mass extinction is the first major extinction event in the Phanerozoic, but the reasons for the decline in global biodiversity before the extinction are not well understood.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2024)
Article
Geochemistry & Geophysics
Junyao Kang, Daniel D. Gregory, Benjamin Gill, Shiqiang Huang, Changxin Lai, Zhaoshan Chang, Huan Cui, Ivan Belousov, Shuhai Xiao
Summary: Sedimentary pyrite is an important geological archive, but it can be altered by diagenetic and hydrothermal processes. This study successfully trained machine learning algorithms to distinguish pyrite origins using trace element data. The approach was validated and applied to identify the origins of pyrite in two sedimentary successions in South China.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2024)