Article
Geosciences, Multidisciplinary
Qingyun Li, Lifei Zhang, Xu Chu, Guibin Zhang, Thomas Bader, Yang Wang, Chenguang Wu
Summary: This study provides detailed insights into the metamorphic evolution and tectonic history of the HP pelitic granulites associated with eclogites from the Kharta Gneiss in the central Himalaya, shedding light on the overall evolution of the Himalayan orogeny.
Article
Geosciences, Multidisciplinary
Huiru Xu, Joseph G. Meert, Manoj K. Pandit
Summary: Through the study of the Marwar Supergroup, it is found that the onset of sedimentation may have occurred after the Cryogenian period, following a hiatus of approximately 125 million years between the end of Malani magmatism and the initiation of Marwar deposition.
GEOSCIENCE FRONTIERS
(2022)
Article
Geosciences, Multidisciplinary
Xin Li, Liang Liu, XiaoYing Liao, YongSheng Gai, Tuo Ma, GuoJian Geng, Tong Li
Summary: The South Altyn high-pressure?ultrahigh-pressure metamorphic belt in West China features high-pressure mafic granulites, with four generations of mineral assemblage that reflect a clockwise P?T path from subduction to exhumation. Zircon U-Pb dating revealed two distinct age clusters, indicating both magmatic protolith ages c. 897 Ma and metamorphic ages c. 494 Ma, consistent with UHP metamorphism in other regions of the South Altyn Orogen.
JOURNAL OF ASIAN EARTH SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
Ravi Ranjan Kumar, Kenta Kawaguchi, Shyam Bihari Dwivedi, Kaushik Das
Summary: The study of the Daltonganj region reveals the petrological characteristics, metamorphic events, zircon ages, and geochemical features, indicating mineral assemblages and protolith sources, as well as metamorphic processes and tectonic settings.
GEOLOGICAL JOURNAL
(2022)
Article
Geochemistry & Geophysics
Jasper R. Huijsmans, Maartje Hamers, Martyn R. Drury, James K. W. Lee
Summary: Complex microstructures of zircon recrystallisation have been discovered, indicating the translation, bending and fading of oscillatory zoning, structural recovery, enrichment in Hf and depletion in Y, and the formation of a recrystallisation interface. The migration of trace elements and dislocations during crystallisation and cooling process leads to enhanced diffusion and further trace element mobility. Understanding the crystallisation and recrystallisation history is crucial for accurate interpretation of U-Pb ages.
Article
Geochemistry & Geophysics
Makiko K. Haba, Joern-Frederik Wotzlaw
Summary: Eucrite meteorites are believed to originate from the upper crust of the asteroid Vesta, with zircons providing insight into the initial magmatism and thermal metamorphism that occurred around 4550-4555 million years ago on Vesta. By using advanced dating methods, researchers were able to distinguish zircons formed during different thermal events in the early stages of Vesta's crustal evolution, shedding light on the formation and history of the Vesta crust. The findings suggest that zircons in eucrites like Camel Donga were formed during early magmatism or global thermal metamorphism in the early stages of Vesta's crustal formation.
Article
Geosciences, Multidisciplinary
Wenhao Zhao, Qiuli Li, Yu Liu, Guoqiang Tang, Xiaoxiao Ling, Jiao Li, Xianhua Li
Summary: Secondary ion mass spectrometry (SIMS) zircon U-Pb dating can be used to determine the absolute ages of magmatic or metamorphic events and distinguish multiple events. This study compiled a dataset of zircon standards dating data to evaluate the long-term external reproducibility and analyzed the uncertainties of single-spot and session analyses.
JOURNAL OF EARTH SCIENCE
(2022)
Article
Geology
Tao Wu, Yaqin Luo, Kongyang Zhu, Qinglong Lin, Yan Zhang, Zilong Li
Summary: This study presents new zircon ages and Lu-Hf isotopes of felsic volcanic rocks in southeastern Zhejiang Province, revealing their petrogenesis and tectonic background. The distribution of volcanic rocks in the province is found to be correlated with time and juvenile components in the source region. The results support the episodic roll-back of the Palaeo-Pacific plate model and refute the hypothesis of a large volume eruption over a short interval of time.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geosciences, Multidisciplinary
Leonid Shumlyanskyy, Simon A. Wilde, Alexander A. Nemchin, Stefan Claesson, Kjell Billstrom, Boguslaw Baginski
Summary: The study of an Eoarchean rock assemblage in the Dniester-Bouh Domain revealed multiple zircon growth events and complex magmatic evolution. Zircon geochemical data indicate a variety of processes involved in the formation of these rocks, reflecting a complicated history of magma evolution.
PRECAMBRIAN RESEARCH
(2021)
Article
Geochemistry & Geophysics
Linlin Li, Yuruo Shi, J. Lawford Anderson, Teresa Ubide, Alexander A. Nemchin, John Caulfield, Xuan-Ce Wang, Jian-Xin Zhao
Summary: Direct dating of mafic dykes/sills is crucial for understanding mantle geodynamic evolution and crust-mantle interaction, but is challenging, especially in ancient samples. This study focuses on Paleoto Neo-Proterozoic mafic dykes/sills in the North China Craton, providing a reliable approach for dating these formations through an integrated investigation of U-Pb isotopes and elemental distribution maps of coexisting baddeleyite, zircon and apatite. Age uncertainties of this method lie mainly in instrumental analysis errors and parameters consistency enrichment trends from crystal cores to rims.
Article
Geology
Shi-Jiong Han, Yan-Chen Yang, Jun-Wei Bo, Zi-Heng Han, Yong-wei Huang, Yun-bao Yang
Summary: The Sipingshan gold deposit in eastern Wandashan Terrane is of intermediate size and is known for its unique hot spring genetic type. Gold orebodies are mainly found in upper and lower siliceous rocks, with siliceous cemented breccia in between. Two main mineralisation periods have been identified based on mineral paragenesis and crosscutting vein relationships. Analytical methods including whole-rock geochemistry, pyrite Rb-Sr dating, zircon U-Pb-Hf contents, and isotopic analysis were conducted to determine the age and genesis of the gold mineralisation.
ORE GEOLOGY REVIEWS
(2023)
Article
Geochemistry & Geophysics
EmilyE. Zawacki, Matthijs C. van soest, Kip V. Hodges, Jennifer J. Scott, Melanie Barboni, Manfred R. Strecker, Craig S. Feibel, Christopher J. Campisano, J. Ramon Arrowsmith
Summary: Detrital zircons from two major rift basins in the East African Rift System are analyzed to understand sediment provenance, landscape dynamics, and the volcanic evolution of the rift system. The results show that the sediments mainly come from silicic volcanic rocks, and the zircon ages correspond to the timing of rift activity. The discrepancy between (U-Th)/He and U/Pb ages of zircons may be related to late volcanic and/or hydrothermal activity.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geochemistry & Geophysics
Heriberto Rochin-Banaga, Donald W. Davis
Summary: This study examines the feasibility of using LA-ICPMS for U-Pb dating of vertebrate and invertebrate apatite fossils. The results suggest that the U-Pb system in shark teeth remains closed until the present but some teeth show anomalous ages possibly due to lead remobilization. Overall, LA-ICPMS allows for more precise absolute dating of fossils.
Article
Geochemistry & Geophysics
Tanya A. Ewing, Daniela Rubatto, Kim Lemke, Jorg Hermann
Summary: The rate of burial of supracrustal sedimentary material in the lower continental crust was investigated by determining the age of protolith deposition and subsequent metamorphism in the Malenco Unit. The detrital zircon cores yielded a maximum depositional age of 424 Ma and most dates falling in the range 450-1000 Ma. The study provides important insights into the processes of continental crust formation.
Article
Geology
Qing-fei Sun, Ke-yong Wang, Feng-yue Sun, Chun-kit Lai, Miao Zhang, Chen-guang Zhao, Li-xue Sun
Summary: The southern Great Xing'an Range in NE China is a significant polymetallic mineral province with superimposing mineralization at the Panjiaduan deposit, occurring in the Late Triassic and Early Cretaceous, influenced by post-collision tectonics and extensional settings after tectonic events in the region.
ORE GEOLOGY REVIEWS
(2021)
Article
Environmental Sciences
Stefania Stevenazzi, Corrado A. S. Camera, Marco Masetti, Roberto S. Azzoni, Elena S. Ferrari, Massimo Tiepolo
WATER AIR AND SOIL POLLUTION
(2020)
Article
Geochemistry & Geophysics
E. Cannao, M. Tiepolo, G. E. Bebout, M. Scambelluri
EARTH AND PLANETARY SCIENCE LETTERS
(2020)
Article
Geosciences, Multidisciplinary
Annamaria Fornelli, Salvatore Gallicchio, Francesca Micheletti, Antonio Langone
Summary: The study of sandstone samples from the Southern Apennines in Italy revealed that the detritus provenance of the Gorgoglione Flysch consisted of metamorphic rocks with abundant granitoids covered by sedimentary rocks, with a volcanic component present. Utilizing U-Pb detrital zircon ages, the provenance area was identified in the northwestern sectors of the Mediterranean area, where the Sardinia-Corsica block plays a fundamental role.
GEOLOGICAL MAGAZINE
(2021)
Article
Geology
Fabrizio Tursi, Pasquale Acquafredda, Vincenzo Festa, Annamaria Fornelli, Antonio Langone, Francesca Micheletti, Richard Spiess
Summary: The formation and evolution of HP mineral assemblages in metagranitoids are influenced by fluid presence during ductile shear under preferential pathways, such as ductile shear zones in the Earth's crust. This study in the Castagna Unit in southern Italy reveals that the mineral assemblages in orthogneisses vary between weakly deformed samples and those within shear zones, with recrystallization induced by fluids during deformation. The mylonitic orthogneisses share the same peak metamorphic conditions as weakly deformed orthogneisses, but with a different equilibrium mineral assemblage stabilized along a fluid-conservative prograde path.
JOURNAL OF METAMORPHIC GEOLOGY
(2021)
Article
Geochemistry & Geophysics
Annamaria Fornelli, Francesca Micheletti
Summary: The Numidian quartz-rich sandstones from the Apennine chain in Southern Italy were studied for their potential industrial use. Sandstones from NW areas are suitable for the glass industry, while those from SE areas are more suitable for colored glass and paint industry raw materials. This study suggests a complete exploitation of these sandstone resources in the manufacturing industry to reduce waste materials and enhance economic value.
ACTA GEODYNAMICA ET GEOMATERIALIA
(2021)
Editorial Material
Geochemistry & Geophysics
Annamaria Fornelli, Francesca Micheletti
Article
Geochemistry & Geophysics
Francesca Micheletti, Annamaria Fornelli, Luigi Spalluto, Mario Parise, Salvatore Gallicchio, Fabrizio Tursi, Vincenzo Festa
Summary: The genesis of terra rossa, a reddish clay soil found in limestone regions with a Mediterranean-type climate, is a controversial subject regarding the origin of the parent material. This study aims to understand the geochemical processes leading to the formation of terra rossa from carbonate bedrock. A multi-method analysis was conducted on a terra rossa deposit in southern Italy, revealing the mineralogical composition and providing evidence for the polygenetic origin of terra rossa through limestone alteration and chemical interaction with allochthonous siliciclastic material.
Article
Geosciences, Multidisciplinary
Annamaria Fornelli, Francesca Micheletti, Salvatore Gallicchio, Fabrizio Tursi, Sara Criniti, Salvatore Critelli
Summary: By analyzing the ages of detrital zircons from southern Italy, the provenance signatures of different formations were determined, contributing to the understanding of the geodynamic evolution of the southern Apennine chain.
JOURNAL OF PALAEOGEOGRAPHY-ENGLISH
(2022)
Article
Geosciences, Multidisciplinary
Vincenzo Festa, Annamaria Fornelli, Francesca Micheletti, Richard Spiess, Fabrizio Tursi
Summary: In this study, the significance of mylonitic reworking in the Serre Massif of Calabria, Italy is revealed through a multidisciplinary approach. The study investigates the structural, microstructural, and petrologic changes in a shear zone affecting Variscan lower crustal rocks. The findings suggest that this shear zone is of prime importance and challenge the previous understanding of the region as an undisturbed continuous section of the Variscan crust. The role of (eo-)Alpine high-pressure tectonics in the Serre Massif is highlighted, indicating a complete rejuvenation of the Variscan basement.
Article
Geochemistry & Geophysics
Huichuan Liu, Alan R. Hastie, Chiara Maria Petrone
Summary: This study conducted isotope analyses on two ocean island basalt (OIB)-associated enriched mafic intrusions in the Yunnan-Burma region, and found that these rocks may have originated from the subduction recycling of marine sediments and altered oceanic crust.
Article
Geochemistry & Geophysics
L. Notini, M. Scambelluri, A. Tommasi, A. Zanetti, F. Ferri, A. Rodriguez-Vargas, E. Rampone
Summary: This study provides important petrologic information on the mantle wedge above an active subduction zone in Southern Colombia. The researchers analyzed a unique suite of rock samples and found evidence of hydration, metasomatism, and partial melting in the mantle wedge. They also observed variations in lithotypes, textures, and mineral abundance, indicating different interactions with melts and fluids. This study sheds light on the complex petrological processes occurring in the mantle wedge and contributes to our understanding of subduction zone dynamics.
Article
Geochemistry & Geophysics
Sourav Bhattacharjee, Aniket Chakrabarty, Roger H. Mitchell, Suresh Chandra Patel, Evgeniy N. Kozlov, Ekaterina N. Fomina, Monojit Dey, Supratim Pal
Summary: The Hogenakkal complex in India consists of silicate-rich and silicate-poor carbonatites and clinopyroxenites. The formation of carbonatite is influenced by silicate minerals. The carbohydrothermal mineralization in the carbonatites is induced by magma-derived fluids and interactions with the surrounding rocks.
Article
Geochemistry & Geophysics
Jia-Min Wang, Kyle Patrick Larson, Jin-Jiang Zhang, Liang Zhao, Fu-Yuan Wu
Summary: The role of collisional belts in the global carbon budget is controversial. This study reveals a previously unrecognized carbon source in the collisional orogen of the Himalayas, where metamorphism of carbonate-bearing rocks in the hanging wall resulted in significant CO2 degassing.
Article
Geochemistry & Geophysics
Joseph Martial Akame, Elson Paiva Oliveira, Vinciane Debaille, Marc Poujol, Bernhard Schulz, Dieudonnee Bisso, Fabien Humbert, Serge Parfait Koah Na Lebogo, Philmont Zo'o Zame
Summary: Archean granitoids play key roles in the crustal evolution and can provide important insights into early geologic processes.
Article
Geochemistry & Geophysics
Xiguang Huang, Jun He, Jingxin Zhao, Jingzhao Dou, Weiyong Li, Aimin Hu, Ge Liu, Yiru Ji, Fukun Chen, Shuangqing Li
Summary: This study investigates the zircon ages and whole-rock geochemical data of Late Paleozoic magmatic rocks in the Western Yunnan Tethyan belt to identify the origin and mechanism of mantle melting. The results suggest that these magmatic rocks may originate from different mantle domains that were metasomatized by slab-derived fluids and sediment-derived melts.