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
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
Benedicte Cenki, Patrice F. Rey, Diane Arcay, Julian Giordani
Summary: This article discusses the formation process of high to ultra-high temperature granulitic terranes, and evaluates the effects of geothermal conditions on their formation using analytical and numerical models. The results of the numerical experiments suggest that variations in radiogenic heat production and shortening rates play important roles in determining the geothermal conditions and rock formation.
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
Geology
Esther Schmaedicke, Thomas M. Will
Summary: The study discusses the composition and formation of garnetite in Erzgebirge ultrahigh-pressure (UHP) garnet peridotite. It is found that garnetite has higher levels of Mg, Ca, and Fe, and lower levels of Na, Ti, P, K, and Si compared to eclogite. The chemical signature of garnetite is explained by metasomatic changes caused by the serpentinization of the host peridotite. The enrichment of compatible elements in garnetite is due to the decomposition of olivine and spinel during serpentinization.
JOURNAL OF METAMORPHIC GEOLOGY
(2023)
Article
Multidisciplinary Sciences
J. Kotkova, Y. Fedortchouk, R. Wirth, M. J. Whitehouse
Summary: Research shows that the morphology of diamonds in ultrahigh-pressure metamorphic rocks is affected by temperature, with diamond morphology transitioning from cubo-octahedral to octahedral above 1100 degrees Celsius.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Geological
Timo Saksala
Summary: This study develops a numerical method to predict the thermal weakening of granite rock under low- and moderate-rate dynamic loading conditions. The thermal weakening is modeled using a continuum approach with a damage-viscoplasticity model. The thermomechanical problem is solved using an explicit staggered method with mass scaling. The model considers the temperature dependence of mineral properties and accounts for the strain rate sensitivity of rock.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Geology
Yi-Peng Li, Lin Ding, Alexander C. Robinson, De-Liang Liu, Jing Xie, Li-Yun Zhang, Chen-Yuan Zhao, Ya-Hui Yue, Yiduo Liu, Ilhomjon Oimuhammadzoda, Mustafo Gadoev, Negmat Rajabov
Summary: One of the key geological features in the Pamir region is a south-dipping lithospheric slab with an intracontinental Wadati-Benioff zone. Previous studies proposed that the slab represents subducted Asian continental lithosphere, while recent research suggests it is delaminated from the Pamir. To investigate these hypotheses, crustal xenoliths sourced from the deep lithosphere in the eastern Pamir were analyzed. The results show that the xenoliths represent the mid-lower crustal rocks of the Pamir magmatic arc and the lower crustal rocks of Pamir terranes, supporting the delamination hypothesis and the minimal northward translation of the Pamir.
JOURNAL OF METAMORPHIC GEOLOGY
(2023)
Article
Geochemistry & Geophysics
Tingting Shen, Lifei Zhang, Jianxin Zhang, Thomas Bader, Zuolin Tian, Fenglin Liu, Jingsui Yang
Summary: Research has found ultrahigh-pressure serpentinites and eclogites in Changawuzi, southwestern Tianshan, China, providing an opportunity to study the mechanisms of exhumation. Field observations and petrological analyses indicate the evolution of eclogites under ultrahigh-pressure conditions and geochemical similarities between serpentinites and eclogites. The study also reveals different stages in the evolution and exhumation of Changawuzi serpentinites and eclogites.
Article
Materials Science, Ceramics
Farid Asadi, Damien Andre, Sacha Emam, Pascal Doumalin, Marc Huger
Summary: In the steelmaking industry, the refractory ceramics used in ladles are found to have improved thermal shock resistance when pre-existing microcracks are present. The Discrete Element Method (DEM) is a suitable numerical approach for modeling the quasi-brittle behavior of these ceramics with microcracks. By introducing initial well-distributed damages following a Weibull distribution, the study aims to investigate the effect of microcracks on the quasi-brittle behavior of a numerical sample under uniaxial and cyclic tensile tests. Ultimately, a quantitative DEM model for simulating such a complex behavior is proposed.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Geochemistry & Geophysics
Ruiguang Pan, Catherine A. Macris, Carrie A. Menold
Summary: The Tso Morari terrane in the Himalayan orogenic belt underwent ultrahigh-pressure coesite-eclogite metamorphism due to subduction of the Indian continent under the Eurasian continent. However, the fluid history and thermal structure during exhumation in this area remain unresolved.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2023)
Article
Geochemistry & Geophysics
Alexander T. De Vries Van Leeuwen, Tom Raimondo, Laura J. Morrissey, Martin Hand, Derrick Hasterok, Chris Clark, Robert Anczkiewicz
Summary: Multi-mineral petrochronology tracks changes in the thermochemical environment experienced by rocks during metamorphism. The study of garnet-chlorite schists from the Walter-Outalpa Shear Zone in South Australia reveals a prolonged record of high thermal gradient metamorphism. The findings suggest that the radiogenic heat production in the basement rocks may have played a significant role in driving the observed metamorphism.
Article
Materials Science, Multidisciplinary
Fariborz Tavangarian, Caleb A. Zolko, Keivan Davami
Summary: Pure nanocrystalline akermanite was successfully synthesized by mechanical activation and heat treatment, with a crystalline size of 34 nm achieved after ball milling for 20 h and subsequent heat treatment at 900 degrees C for 1 h. The formation mechanism involved the formation and consumption of transitionary compounds.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Geography, Physical
Nils Reidar B. Olsen
Summary: A numerical model was used to simulate the formation of a braided channel system, with a focus on explaining the avulsion processes of a braided river in detail. The results showed the significant impact of different parameters on the braiding morphology through numerical calculations of each process.
Article
Geology
Haiqi Yuan, Jian Wang, Keiko Hattori, Yanchen Yang, Jinlin Liu, Zhipeng Xie
Summary: The translation mentions that the Yangkou area in the Sulu ultrahigh pressure metamorphic belt records three stages of metamorphism, which is of great importance for understanding the influence of plate tectonics on the continental crust.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geochemistry & Geophysics
D. R. Skipton, C. J. Warren, F. Hanke
Article
Geology
Laura Airaghi, Clare J. Warren, Julia de Sigoyer, Pierre Lanari, Valerie Magnin
JOURNAL OF METAMORPHIC GEOLOGY
(2018)
Article
Geochemistry & Geophysics
Christopher S. McDonald, Daniele Regis, Clare J. Warren, Simon P. Kelley, Sarah C. Sherlock
Article
Geology
Francesco Giuntoli, Luca Menegon, Clare J. Warren
JOURNAL OF METAMORPHIC GEOLOGY
(2018)
Article
Geochemistry & Geophysics
L. Airaghi, J. de Sigoyer, S. Guillot, A. Robert, C. J. Warren, D. Deldicque
Article
Geosciences, Multidisciplinary
R. E. Holdsworth, A. Morton, D. Frei, A. Gerdes, R. A. Strachan, E. Dempsey, C. Warren, A. Whitham
PRECAMBRIAN RESEARCH
(2019)
Article
Geosciences, Multidisciplinary
Christopher S. McDonald, Clare J. Warren, Felix Hanke, Julian Chard
Article
Geology
Thomas Hopkinson, Nigel Harris, Nick M. W. Roberts, Clare J. Warren, Sam Hammond, Christopher J. Spencer, Randall R. Parrish
Article
Geosciences, Multidisciplinary
A. Ceccato, L. Menegon, C. J. Warren, A. M. Halton
JOURNAL OF STRUCTURAL GEOLOGY
(2020)
Article
Geochemistry & Geophysics
Francesco Giuntoli, Luca Menegon, Clare J. Warren, James Darling, Mark W. Anderson
Article
Geochemistry & Geophysics
Veleda A. P. Muller, Mauricio Calderon, Julie C. Fosdick, Matias C. Ghiglione, Leonardo F. Cury, Hans-Joachim Massonne, C. Mark Fanning, Clare J. Warren, Cristobal Ramirez de Arellano, Pietro Sternai
Summary: This study investigated the poorly studied hinterland region of the Southern Andean Cordillera in the Western Domain of the Magallanes Fold-and-Thrust Belt, revealing Late Jurassic and Early Cretaceous tectonic activities through new detrital zircon U-Pb ages. The findings provide insights into the initial phases of the Andean Orogeny and the along-strike connection of mylonite belts in a continent-verging thrust structure during the closure of the Rocas Verdes back-arc marginal basin.
Editorial Material
Multidisciplinary Sciences
Alex Copley, Owen Weller, Peter Cawood, Clare Warren
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2021)
Article
Geochemistry & Geophysics
Joshua M. Garber, Matthew Rioux, Michael P. Searle, Andrew R. C. Kylander-Clark, Bradley R. Hacker, Jeff D. Vervoort, Clare J. Warren, Andrew J. Smye
Summary: The study of high-pressure eclogites in Oman's Saih Hatat window utilized various radiometric dating results to determine the timing and cause of continental subduction. The findings suggest a single metamorphic event in the As Sifah rocks sourced from the Arabian continental margin, with no evidence for a 110 Ma event or SW-dipping subduction. The data indicate the subduction of the As Sifah unit at rates similar to other continental HP bodies, followed by two stages of cooling and exhumation.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geology
Barbara E. Kunz, Clare J. Warren, Frances E. Jenner, Nigel B. W. Harris, Tom W. Argles
Summary: This study investigates the enrichment mechanism of metals such as Li, Be, V, Co, Nb, In, Cs, Sn, Ta, and W in metamorphic processes. By analyzing muscovite and biotite from metasediment-hosted samples, the study reveals the preferential incorporation of these metals into mica minerals and their release during crustal melting. The findings highlight the importance of higher-temperature melting, particularly biotite breakdown reactions, for the mobilization of these critical metals.
Article
Geochemistry & Geophysics
Thomas N. Hopkinson, Nigel B. W. Harris, Clare J. Warren, Christopher J. Spencer, Nick M. W. Roberts, Matthew S. A. Horstwood, Randall R. Parrish
EARTH AND PLANETARY SCIENCE LETTERS
(2017)
Article
Geochemistry & Geophysics
Lingyu Zhang, Kristoffer Szilas
Summary: This study presents new petrological and geochemical data for the Narssaq Ultramafic Body (NUB) in the Itsaq Gneiss Complex of SW Greenland. The results indicate that the ultramafic rocks of NUB are not mantle residues, but instead represent crustal cumulates derived from high-Mg magmas.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Rong Xu, Sarah Lambart, Oliver Nebel, Ming Li, Zhongjie Bai, Junbo Zhang, Ganglan Zhang, Jianfeng Gao, Hong Zhong, Yongsheng Liu
Summary: This study investigated the iron isotope compositions of Cenozoic basalts in Southeast China, finding significant variations related to different types of basalts and their respective sources.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
C. J. Ebinger, Miriam C. Reiss, Ian Bastow, Mary M. Karanja
Summary: The East African rift system is formed above mantle upwellings and the formation of rifts is related to lithospheric thinning and magmatic activity. The amount of splitting varies spatially and the fast axes are predominantly parallel to the orientation of the rifts. Thick lithospheric modules have less splitting and different orientations, which may indicate mantle plume flow. Splitting rotates and increases in strength as it enters the rift zones, suggesting that the anisotropy is mainly present at shallow depths.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Correction
Geochemistry & Geophysics
Ekaterina Rojas-Kolomiets, Owen Jensen, Michael Bizimis, Gene Yogodzinski, Lukas Ackerman
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Robert W. Nicklas, Igor S. Puchtel, Ethan F. Baxter
Summary: Oxygen fugacity is a fundamental parameter for understanding redox processes in igneous systems. This study compares the Fe-XANES oxybarometry method with the V-in-olivine method for evaluating fO(2) in MORB lavas. The results show that the V-in-olivine method is not applicable to samples with low MgO content, and that the majority of Archean komatiite sources have lower fO(2) than modern MORB.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Chunfei Chen, Stephen F. Foley, Sebastian Tappe, Huange Ren, Lanping Feng, Yongsheng Liu
Summary: The volatile components CO2 and H2O play a major role in mantle melting and heterogeneity. In this study, Ca isotopes were used to trace the lithological heterogeneity in alkaline magmatic rocks. The results revealed the presence of K-richterite and carbonate components as the source of alkaline magmas with low delta 44/40Ca values. These findings highlight the importance of Ca isotopes as a robust tracer of lithological variation caused by volatiles in the Earth's upper mantle.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Timothee Jautzy, Gilles Rixhon, Regis Braucher, Romain Delunel, Pierre G. Valla, Laurent Schmitt, Aster Team
Summary: Although the current approach to estimate catchment-wide denudation rates using only 10Be concentrations has made significant progress in geomorphology, this study argues for the inclusion of 26Al measurements and testing of steady-state assumptions in slow eroding, formerly glaciated landscapes. The study conducted measurements of both 10Be and 26Al in stream sediments from the Vosges Massif in France and found that elevation, slope, channel steepness, and precipitation were the primary factors controlling denudation rates. The study also revealed a significant relationship between the extent of past glaciation and the cosmogenic (un-)steadiness in the stream sediments.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Erik van der Wiel, Douwe J. J. van Hinsbergen, Cedric Thieulot, Wim Spakman
Summary: Numerical models of Earth's mantle dynamics can predict the vigour and mixing of mantle flow, and the average slab sinking rates are an unexplored parameter that can provide intrinsic information on these characteristics. Through numerical experiments, it has been found that slab sinking rates are strongly correlated with mantle convection and mixing, and may explain geochemical observations from hotspot volcanoes.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)