Article
Geochemistry & Geophysics
Veronica Peverelli, Alfons Berger, Martin Wille, Andreas Mulch, Pierre Lanari, Thomas Pettke, Benita Putlitz, Marco Herwegh
Summary: Inverted passive continental margins provide a comprehensive understanding of fluid circulation in the continental crust during orogens. This study uses U-Pb geochronology and Pb-Sr-O-H isotope geochemistry to trace hydration events in the continental crust of the inverted Adriatic passive continental margin. The results reveal multiple hydration events with different fluid sources and pathways.
Article
Geology
Zhongwu Lan, Gangyang Zhang, Rong Cao, Fei Li, Huawen Cao, Hao Zou
Summary: The Mazhala Au-Sb deposit in South Tibet was found to have formed during the early stage of ca. 35 Ma, which is consistent with the timing of Eocene leucogranite intrusions. The mineralization process of this deposit was mainly influenced by metamorphic water in Paleozoic-Mesozoic metamorphic sedimentary rocks. In contrast, the Cuonadong Sn polymetallic mineralization in Southeastern Tibet was formed during the crustal extension stage in the Miocene, mainly sourced from magmatic water.
ORE GEOLOGY REVIEWS
(2023)
Article
Chemistry, Analytical
Guo-Qi Liu, Kui-Dong Zhao, Thomas Ulrich, Wei Chen, Di Zhang, Qian Li, He-Dong Zhao, Rong-Qing Zhang, Fei Xia
Summary: The Isoclock software is developed for robust U-Pb dating of accessory minerals using LA-ICP-MS. It focuses on deducting common Pb from reference materials and provides a new common Pb correction method. The software allows the deduction of common Pb in 206Pb, 207Pb, and 208Pb, enabling U/Pb and Th/Pb age calculations. Isoclock has a user-friendly interface and is written in Python, making it versatile and accessible for researchers.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2023)
Article
Geology
Yun-Hui Zhang, Rong-Wen Yao, Ying Wang, Ji Duo, Hua-Wen Cao
Summary: The genesis and spatial-temporal evolution of Pb-Zn mineralization in the Northern Gangdese Metallogenic Belt were studied through the investigation of the Zebuxia Pb-Zn deposit. The research results provide insights into the prospecting potential of the Western section of the Northern Gangdese Metallogenic Belt.
ORE GEOLOGY REVIEWS
(2022)
Article
Geosciences, Multidisciplinary
Peng Gao, Limei Tang, Ling Chen
Summary: This study investigates the Ross Orogenic Belt in the Transantarctic Mountains of Antarctica. By analyzing the geochemical and geochronological data of the North Victoria Land Granite Harbour Intrusive complex, the impact of early Paleozoic magmatism on continental crust growth through accretionary orogenesis is revealed. The syenite shows characteristics of island-arc granite and was emplaced at approximately 471.8-477.3 Ma, resulting from the partial melting of the lithospheric mantle enriched with subduction slab fluids and subcontinental lithosphere. A tectonic-magmatic model involving alternating phases of extension and contraction in the overriding plate is proposed. The study concludes that the (post-orogenic) magmatism occurred during extension in the overriding plate at around 478-471 Ma.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
Guichun Liu, Zaibo Sun, Jianwei Zi, M Santosh, Tianyu Zhao, Qinglai Feng, Guangyan Chen, Xiaomei Nie, Jing Li, Shitao Zhang
Summary: The recently identified Mayidui and Wanhe ophiolitic melanges in southwest Yunnan represent ancient oceanic crust and sediments, formed in Middle Ordovician. Geochemical analysis shows that these ophiolites were likely formed in an intra-oceanic setting with MORB-like and E-MORB-type mantle sources, providing robust constraints on the nature and timing of their formation.
GEOSCIENCE FRONTIERS
(2021)
Article
Geosciences, Multidisciplinary
Peng Zhang, Linlin Kou, Yan Zhao, Deming Sha
Summary: This paper presents a study on the Maoling gold deposit, revealing its ore-forming mechanism and genesis, including the composition of magmatic water and meteoric water, the characteristics of fluid inclusions, and the isotopic characteristics of sulfur, hydrogen, oxygen, and lead. The results show that fluid boiling was the critical factor controlling the mineralization at Maoling, and the ore-forming materials mainly originated from the host rocks and magma.
GEOSCIENCE FRONTIERS
(2022)
Article
Geochemistry & Geophysics
Kun Wang, Dan Yang, Ke-Jun Hou, Qian Wang
Summary: This study conducted research on the volcanic rocks from the Northern Yidun arc, including zircon ages, petrology, major and trace element geochemistry, and Sr-Nd-Hf isotope geochemistry, to understand the magmatic system activity time, origin of magma evolution, and metallogenic model of the Gacun deposit.
Article
Geochemistry & Geophysics
Anh T. Q. Nong, Christoph A. Hauzenberger, Daniela Gallhofer, Sang Q. Dinh
Summary: Late Mesozoic igneous rocks in southern Vietnam and southernmost Indochina exhibit six different rock suites, indicating multiple magmatic pulses during late-stage convergent margin processes. The geochemical and geochronological characteristics suggest a transition from subduction to extensional tectonic settings, possibly influenced by basaltic injection/asthenospheric upwelling. These rocks are related to two significant tectonic stages: Paleo-Pacific subduction (110-90 Ma) and transitional phase towards the opening of the South China Sea (83-75 Ma).
Article
Geosciences, Multidisciplinary
Harald Hansen, Trond Slagstad, Steffen G. Bergh, Andrey Bekker
Summary: New geochronological data for the Karasjok Greenstone Belt in northwestern Fennoscandia shows that its age ranges from 2.47 to 1.96 billion years ago. This study provides important insights into the geological evolution of the region during the early Paleoproterozoic era.
PRECAMBRIAN RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Harald Hansen, Trond Slagstad, Steffen G. Bergh, Andrey Bekker
Summary: New geochronological data reveals the age of the Karasjok Greenstone Belt to be between 2.47 and 1.96 billion years. It consists of volcano-sedimentary units deposited on crystalline basement rocks. The study also identified various tectonic events related to magmatism, rifting, and supercontinent breakup. Carbon isotope analysis indicates isotopic variations in carbonate sediments from different formations within the belt.
PRECAMBRIAN RESEARCH
(2023)
Article
Chemistry, Analytical
Yanwen Tang, Junjie Han, Tingguang Lan, Jianfeng Gao, Liang Liu, Changhao Xiao, Jiehua Yang
Summary: Scheelite is an important metallic mineral in W-related hydrothermal deposits and can be used as a reliable geochronometer. By evaluating two calibration methods using LA-SF-ICP-MS, scheelite WX27 has been determined as a suitable secondary standard for in situ U-Pb dating.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2022)
Article
Chemistry, Analytical
Jay M. Thompson, Karsten Goemann, Ivan Belousov, Kate Jenkins, Alan Kobussen, Will Powell, Leonid Danyushevsky
Summary: This study presents an analytical methodology for accurate analyses of ilmenite by LA-ICP-MS, including major, minor, trace element, and U-Pb isotopic compositions. Through optimization of laser fluence and calibration materials, the accuracy of ilmenite chemical and isotopic compositions are significantly improved. The use of rutile as a primary calibration material for Pb/U ratios produces accurate U-Pb ages within analytical uncertainties.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2021)
Article
Geosciences, Multidisciplinary
Hugo K. H. Olierook, Christopher L. Kirkland, Milo Barham, Matthew L. Daggitt, Julie Hollis, Michael Hartnady
Summary: The study presents a technique to rapidly extract meaningful core model ages from core-rim mixtures, along with a Python-based program for easy application of this approach. The efficacy of the technique is demonstrated on a detrital sample from East Greenland, recovering dates of detrital cores from core-rim mixtures. Caution is advised against using this technique without checking the appropriateness of the underlying assumptions, and chemical means are provided for evaluating the assumptions.
Article
Geosciences, Multidisciplinary
Jose Joaquin Jara, Fernando Barra, Martin Reich, Diego Morata, Mathieu Leisen, Rurik Romero
Summary: Through a comprehensive study of the geochronology and petrogenesis of plutonic complexes from the Coastal Cordillera of northern Chile, new constraints on the onset of the Andean tectonic cycle and the transition between pre-Andean and early Andean stages are provided. The Andean orogeny is suggested to have started around 210 million years ago based on the data, which also supports episodic high-flux magmatism and eastward migration of the magmatic arc during the Mesozoic.
Article
Geography, Physical
Huyue Song, Shixue Hu, Michael Benton, Dayong Jiang
Summary: This article examines the end Permian to Middle Triassic interval, which witnessed a significant marine mass extinction and delayed recovery. The focus is on Triassic marine sediments in South China, providing unique documentation of the collapse and recovery of marine ecosystems. Several papers analyze different fossils and their ecological significance, while others study biostratigraphy, reconstruct paleoenvironments, and link records to volcanic eruptions.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Mohammad Firoze Quamar, Upasana Swaroop Banerji, Biswajeet Thakur, Ratan Kar
Summary: The Indian Summer Monsoon is a crucial component of the Asian Monsoon System, impacting rainfall, agricultural productivity, and socio-economic growth in India and nearby regions. The central monsoon zone in India is more responsive to strong monsoon phases than weak ones.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Maria Laura Balestrieri, Valerio Olivetti, David Chew, Luca Zurli, Massimiliano Zattin, Foteini Drakou, Gianluca Cornamusini, Matteo Perotti
Summary: This study presents a multidisciplinary provenance study on legacy cores drilled in the central Ross Sea, Antarctica, providing insights into the oscillation of ice flows and advance and retreat phases of the West Antarctic Ice Sheet.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
P. Depuydt, S. Toucanne, C. Barras, S. Le Houedec, M. Mojtahid
Summary: This study provides a comprehensive overview of the dynamics of the upper branch of the Atlantic Meridional Overturning Circulation (AMOC) in the mid-latitudes of the Northeast Atlantic. It focuses on the European Slope Current (ESC) and its glacial equivalent known as the Glacial Eastern Boundary Current (GEBC). The study reveals significant changes in flow strength and ventilation during the glacial and deglaciation periods, as well as a gradual weakening of the slope current during the Holocene.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Junhee Park, Holly J. Stein, Judith L. Hannah, Svetoslav V. Georgiev, Oyvind Hammer, Snorre Olaussen
Summary: This study reports new Re-Os ages for black shales from Svalbard and evaluates the paleoenvironment during organic-rich shale deposition. The study also proposes correlations of specific Late Jurassic ammonite zones between the Boreal and Tethyan realms.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Guocheng Dong, Weijian Zhou, Feng Xian, Yunchong Fu, Li Zhang, Ling Tang, Pengkai Ding
Summary: The cause of ice-age cycles is still not fully understood, and studying the timing and magnitude of mountain glaciations can provide valuable insights. This study presents new dating results from the Niqingqu Valley in the Tibetan Plateau, showing multiple glacial activities prior to the Penultimate Glacial Maximum. The findings suggest that low atmospheric CO2 content and reduced summer solar insolation/high summer-monsoon precipitation played a role in these glacial fluctuations.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Haoran Dong, Zhitong Chen, Yucheng Wang, Jie Chen, Zhiping Zhang, Zhongwei Shen, Xinwei Yan, Jianbao Liu
Summary: Through sediment records from Lake Nanyi in the lower Yangtze, we found that anthropogenic fire activity played a dominant role in the region, and the temporal pattern of fire activity was asynchronous from east to west. Archaeological evidence suggests an inverse relationship between agricultural and population levels and fire intensity during the mid-Holocene, with fire intensity being influenced by the diversity of landscape types associated with pre-historic subsistence patterns. Overall, changes in regional water-level delayed the transition from hunting-gathering to agriculture in the lower Yangtze region.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Giovanni Coletti, Giulia Bosio, Alberto Collareta, Or Mordecai Bialik, Eleonora Regattieri, Irene Cornacchia, Gianni Insacco, John Buckeridge
Summary: This paper argues that sessile barnacles are an excellent proxy for palaeoenvironmental reconstructions. The shells of barnacles consist of diagenetically stable low-magnesium calcite and record short-term variations. Analyses of several Western Mediterranean barnacle-rich deposits demonstrate the utility of barnacles as proxies for water depth, distance from the coastline, and hydrodynamic conditions. Moreover, the stable isotope ratios of barnacle shells can provide detailed palaeoenvironmental information.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Feng Wu, Xinong Xie, Wen Yan, Youhua Zhu, Beichen Chen, Jianuo Chen, Mo Zhou
Summary: This paper describes the Quaternary evolution of Meiji Atoll in the southern South China Sea. The findings show how variations in sea surface temperature, eustatic sea level, and tectonics have influenced the development of the atoll. These findings have broader implications for understanding the Quaternary evolution of similar tropical carbonate atolls in the region.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Ana Mateos, Ericson Hoelzchen, Jesus Rodriguez
Summary: The Epivillafranchian and the transition to the Galerian was a period of environmental fluctuations and faunal turnover. Hominins and giant hyenas could coexist during the Epivillafranchian, but the transition to the Galerian led to a disruption of the scavenging niche, coinciding with the extinction of P. brevirostris.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Tianyu Du, Wensheng Zhang, Bing Li, Linjing Liu, Yuecong Li, Yawen Ge, Shiyong Yu
Summary: This article presents sedimentary evidence for a dramatic channel displacement of the lower Yellow River about 3000-2600 years ago, and explains the impact of this displacement on the geomorphology and human migration.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Johann Mueller, Michael M. Joachimski, Oliver Lehnert, Peep Mannik, Yadong Sun
Summary: The Late Ordovician mass extinction occurred during an ice age, with maximum ice coverage and a substantial drop in global sea level. This led to the exposure or shallowing of shallow tropical shelf environments. The study suggests that the burial rate of nutrient phosphorus (P) on shelves was minimal during this glacial period, leading to excess bioavailable P entering the open ocean and stimulating phytoplankton production, which in turn lowered oxygen concentrations.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Marina Addante, Patrizia Maiorano, Giovanna Scopelliti, Angela Girone, Maria Marino, Samanta Trotta, Antonio Caruso
Summary: This study presents the first high-resolution results on planktonic foraminiferal stable oxygen isotopes and calcareous plankton assemblages, providing insights into the glacial-interglacial variability and North Atlantic climate variability. The research also reveals evidence of the first significant southward migration of the Subarctic Front in the mid-latitudes.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Bing-Cai Liu, Rui-Wen Zong, Kai Wang, Jiao Bai, Yi Wang, Hong-He Xu
Summary: Phytogeography plays a vital role in the evolution of plants. This paper describes a new species of a spore-bearing plant from the upper Silurian period in West Junggar, China. By analyzing global Silurian macrofossil records, the study reveals the spatial-temporal distribution of Silurian plant macrofossils and identifies two phytogeographic realms during the Pridoli Epoch.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Francois Fournier, Thomas Teillet, Alexis Licht, Jean Borgomano, Lucien Montaggioni
Summary: This study investigates the temporal evolution of neritic carbonates in the proto-South China Sea to reconstruct East Asian monsoonal currents and winds during the middle to late Paleogene. The results highlight that many of the features of the summer East Asian Monsoon large-scale circulation are rooted in the middle Paleogene.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)