Article
Geosciences, Multidisciplinary
Yongsheng Gai, Liang Liu, Guowei Zhang, Chao Wang, Xiaoying Liao, Wenqiang Yang, Lei Kang, Tuo Ma, Yuting Cao
Summary: A study of HP-UHP rocks in South Altyn Tagh reveals a differential exhumation process for the eastern and western segments, with the rocks in the eastern segment experiencing distinct metamorphism and rapid exhumation compared to the western segment.
Article
Geosciences, Multidisciplinary
Xin Chen, Hans-Peter Schertl, Pingyang Gu, Youye Zheng, Rongke Xu, Jinyang Zhang, Pengjie Cai, Chenggui Lin
Summary: High pressure and ultrahigh pressure oceanic rocks are rare in the Indus-Yarlung Tsangpo suture zone in the Tibetan Plateau, but they can provide important insight into the India-Asia collision tectonics. This study focuses on HP garnet amphibolites in the Western Himalaya, which underwent three metamorphic stages and represent a piece of oceanic slice sourced from depleted mantle material. These rocks experienced profound metamorphism during the India-Asian collision, helping to understand the tectonic evolution of the Western Himalaya orogen.
Article
Geochemistry & Geophysics
Dingding Zhang, Lin Ding, Yi Chen, Hans-Peter Schertl, Muhammad Qasim, Umair Khan Jadoon, Houqi Wang, Jinxiang Li, Liyun Zhang, Yahui Yue, Jing Xie
Summary: A new type of eclogite was discovered in the Naran area of the Western Himalayan Syntaxis, and its metamorphic conditions and exhumation history were studied using phase equilibrium calculations and thermobarometer. SIMS U-Pb dating was performed on metamorphic zircons and rutile to determine the age of the high-pressure metamorphism and cooling, respectively. The exhumation rate of the Naran massif was found to be lower than that of the Upper Kaghan Valley massif, indicating inconsistent exhumation histories of the continental slices in the Western Himalayan Syntaxis.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geosciences, Multidisciplinary
Svenja Trapp, Marian Janak, Kathrin Fassmer, Nikolaus Froitzheim, Carsten Muenker, Neven Georgiev
Summary: The study confirms ultra-high-pressure metamorphism in the Rhodope Metamorphic Complex in Bulgaria and determines the Variscan age of metamorphism through Lu-Hf dating of garnet-whole-rock. By analyzing eclogite samples from Belica and Gega, the research reveals the metamorphic processes and ages in these regions.
Article
Geochemistry & Geophysics
Olga V. Rezvukhina, Sergey G. Skublov, Dmitriy I. Rezvukhin, Andrey V. Korsakov
Summary: This study highlights the utility of rutile in reconstructing the metamorphic evolution of ultrahigh-pressure rocks containing diamond, showcasing its distinct textural positions and geochemical characteristics in a diamondiferous kyanite gneiss. The findings suggest a metapelitic origin of rutile and provide temperature estimates using Zr-in-rutile geothermometer. Dating results indicate a younger age for rutile compared to peak metamorphic assemblages, showcasing cooling rates and exhumation processes. The study demonstrates rutile as a valuable tool in understanding the metamorphic evolution of diamond-bearing rocks.
Article
Geosciences, Multidisciplinary
Katarzyna Walczak, Christopher J. Barnes, Jaroslaw Majka, David G. Gee, Iwona Klonowska
Summary: This study provides the first record of the early Caledonian event in the southern Scandinavian Caledonides. The evidence was obtained through depth profiling of zircon grains. The results suggest that the entire outer margin of Baltica underwent deep subduction in the late Cambrian to early Ordovician, with the record of this event being largely erased by subsequent metamorphism.
GEOSCIENCE FRONTIERS
(2022)
Article
Geosciences, Multidisciplinary
Huan Tang, Hong-Fu Zhang, Ming-Jie Zhang, Haibo Zou, Juan Zhang
Summary: The East Kunlun Orogen is a long-lived accretionary orogenic belt that records the Paleozoic-Mesozoic amalgamation processes of the East Asia continent. Research suggests that the orogenic belt underwent a Neoproterozoic magmatic event, an early Paleozoic metamorphic event, and a Neoproterozoic tectonothermal event related to the assembly of the Rodinia supercontinent.
PRECAMBRIAN RESEARCH
(2022)
Article
Geology
David Hernandez-Uribe, Chris G. Mattinson, Megan E. Regel, Jianxin Zhang, Katie A. Stubbs, Andrew R. C. Kylander-Clark
Summary: New zircon U-Pb ages and trace-element data from eclogite and host paragneiss in the Dulan area, China, show that this terrane experienced about 42 million years of eclogite-facies metamorphism, similar to other large UHP terranes. The metamorphic ages of paragneiss are generally younger than that of eclogite, suggesting the later stages of continental collision. The study reconciles the observations with model predictions by highlighting the role of differential solubility in zircon growth or recrystallization along the pressure-temperature (P-T) path.
JOURNAL OF METAMORPHIC GEOLOGY
(2023)
Article
Geochemistry & Geophysics
Cheng-Wei Zhang, Yang Yang, Yi-Can Liu, G. Groppo, F. Rolfo
Summary: Metamorphosed granitic rocks in continental collisional terranes are important for understanding the metamorphic evolution of deeply subducted continental crust. This study reconstructs the three-stage metamorphic evolution of metamorphosed garnet-bearing granitic rocks in the central Dabie UHP metamorphic zone (CDZ), using a multidisciplinary approach. The study reveals the presence of ultrahigh pressure (UHP) and ultrahigh temperature (UHT) metamorphic events in these rocks, providing new constraints on the metamorphic evolution and exhumation processes of deeply subducted granitic rocks during continental collision.
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
Jinrui Zhang, Shuang Tang, Chunjing Wei, Wenliang Xu, Hang Chu, Ling Jiang
Summary: This study presents systematic data on the metamorphic evolution of the Barrovian metamorphic series, providing insights into its tectonic significance. The P-T path of this series indicates a crustal over-thickening event, followed by prograde metamorphism, decompression, and cooling. The ages of detrital zircons in the mica schist samples suggest that the North China Craton was the source, and the metamorphic age of the sillimanite zone is consistent with the timing of the Devonian orogeny.
JOURNAL OF ASIAN EARTH SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Mahyra Tedeschi, Pedro Leonardo Rossi Vieira, Matheus Kuchenbecker, Bruno V. Ribeiro, Vitor Barrote, Humberto Reis, Laura Stutenbecker, Cristiano Lana, Antonio Pedrosa-Soares, Ivo Dussin
Summary: The assessment of detrital zircon age records in basin analysis is prone to biases caused by high to ultrahigh temperature (HT-UHT) metamorphism, which can disturb the U-Pb zircon system and result in protracted age distributions. This study re-evaluates geochronological data on HT-UHT metamorphic rocks from different eras to demonstrate the unclear geological meaning of their age distributions. To overcome this bias, a workflow combining multi-proxy approaches and petrochronological investigation is proposed. It allows for the appraisal of biases imposed by HT-UHT metamorphism in the U-Pb detrital zircon record and suggests ways to overcome these issues.
GEOSCIENCE FRONTIERS
(2023)
Article
Geosciences, Multidisciplinary
Yuanyuan Zhang, Chunjing Wei, Hang Chu
Summary: By studying garnet mica schists in the Hongqiyingzi Complex on the northern margin of the North China Craton, researchers have identified four phases of metamorphism, connecting with regional geological events including Paleoproterozoic orogenic belt tectonic changes, Late Paleozoic extension, and Early Mesozoic collision. The study provides insights into the complex tectonic evolution of the North China Craton and surrounding regions.
Article
Geosciences, Multidisciplinary
Lijuan Zhang, Lifei Zhang, Ning Qi, Thomas Bader
Summary: Quartzo-feldspathic metasedimentary rocks are common in high pressure-ultrahigh pressure metamorphic belts, but their origin and metamorphic evolution remain poorly understood. In the Western Tianshan metamorphic belt, China, an UHP eclogite-facies felsic schist was discovered, which underwent UHP metamorphism in the coesite stability field. Petrological observations and phase equilibria modeling revealed its prograde metamorphism at 21-24 kbar, 445?-470?, a pressure peak at 25-28 kbar and 490?-525?, and the subsequent heating with decompression to 20 kbar and 560?. This study provides new evidence for the coherent exhumation of the UHP unit in the Western Tianshan metamorphic belt, with the final uplift of the Western Tianshan oceanic crust attributed to fluid activity and late tectonic deformation.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
Rucheng Zhang, Mingguo Zhai, Lei Zhao
Summary: Interpretations of high-grade terranes recording multiple episodes of metamorphism can be challenging. This study focuses on the Jiaobei terrane in the North China Craton, which has experienced both late Neoarchean metamorphism and late Paleoproterozoic tectonic thermal event. By analyzing metamorphic zircons, the researchers were able to determine the timing and features of each event, shedding light on the geological evolution of the Jiaobei terrane and the NCC.
PRECAMBRIAN RESEARCH
(2022)
Article
Engineering, Civil
Philippe Turpaud, Luca Zini, Natasa Ravbar, Franco Cucchi, Metka Petric, Janko Urbanc
WATER RESOURCES MANAGEMENT
(2018)
Article
Chemistry, Analytical
Giovanni Costa, Piero Brondi, Laura Cataldi, Stefano Cirilli, Arianna Cuius, Deniz Ertuncay, Piero Falconer, Luisa Filippi, Simone Francesco Fornasari, Veronica Pazzi, Philippe Turpaud
Summary: Strong motion monitoring networks play a crucial role in understanding the effects of seismic activity on ground motion. The Italian Strong Motion Network (RAN) is an effective and efficient network with 648 stations that has been developed through a collaboration between the Italian government, regions, and local authorities. The network provides real-time data analysis and generates reports for civil protection purposes, contributing to the updating of seismic hazard maps and building codes.
Article
Soil Science
Gilberto Bragato, Davide Mosetti, Philippe Turpaud, Gian Maria Niccolo Benucci, Domizia Donnini
Summary: The production of Tuber aestivum, an economically valuable truffle species, is influenced by soil type and host tree species. Higher alkalinity and lower soil compactness promote the establishment of truffle brile' and increase the production of ascocarps. The management practices in truffle orchards, such as tillage, can also affect the productivity of T. aestivum.
APPLIED SOIL ECOLOGY
(2022)
