Article
Geochemistry & Geophysics
S. Jung, J. A. Pfander, K. Mezger, E. Hellebrand, S. Brandt
Summary: Determining the ages and duration of high-grade metamorphic episodes and melt extraction events through studies of multichronometric garnet data in the Pan-African Damara belt of Namibia provides crucial insights into the chemical and petrological evolution of the Earth's continental crust over time.
Review
Geosciences, Multidisciplinary
Alexander Simpson, Stijn Glorie, Martin Hand, Carl Spandler, Sarah Gilbert
Summary: Recent advances in laser ablation reaction-cell mass spectrometry enable rapid and efficient Lu-Hf age dating of minerals. This study applies the novel LA-ICP-Q-MS/MS method to analyze garnets from the 'Moine Supergroup' Scotland and reveals terrane scale geochronological information in polymetamorphic rocks. The laser ablation Lu-Hf dating accurately determines the timing of different metamorphic events within single garnets and provides insight into micron-scale processes such as Lu diffusion and garnet recrystallization.
Article
Multidisciplinary Sciences
Suzanne L. Baldwin, Jan Schonig, Joseph P. Gonzalez, Hugh Davies, Hilmar von Eynatten
Summary: This passage discusses the process of rock recycling within the forearcs of subduction zones, including the subduction of rocks, exhumation to the surface, and erosion to form new sediment. Discoveries of ultrahigh-pressure indicator mineral coesite and other inclusions provide insights into the petrologic evolution of plate boundary zones.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Review
Geosciences, Multidisciplinary
Jan Schoenig, Hilmar von Eynatten, Guido Meinhold, Nils Keno Luensdorf
Summary: Studying ultrahigh-pressure metamorphism through mineral inclusions in sedimentary rocks provides important insights into plate tectonics evolution and the existence of ultrahigh-pressure terranes.
EARTH-SCIENCE REVIEWS
(2022)
Article
Geology
Kathrin Fassmer, Nikolaus Froitzheim, Marian Janak, Merle Strohmeyer, Michal Bukala, Markus Lagos, Carsten Muenker
Summary: The collision of Baltica and Laurentia during the Caledonian Orogeny around 400-420 Ma is recorded in the Seve Nappe Complex in Sweden. Eclogites found in the Vaimok and Tsakkok lenses represent rocks from the Baltican continental margin and former oceanic basalts associated with calcschists, possibly representing the ocean-continent transition between Baltica and Iapetus. The ages of eclogites from the Vaimok and Tsakkok lenses were determined to be around 480-488 Ma, suggesting different tectonic events in the Seve Nappe Complex in Jamtland and Norrbotten.
JOURNAL OF METAMORPHIC GEOLOGY
(2021)
Article
Geochemistry & Geophysics
Chi Cao, Hao Cheng
Summary: Understanding the timing and duration of mineral growth is crucial for studying metamorphic belts. Garnet Lu-Hf geochronology is a powerful tool in this regard. Radiometric dating showed that small garnet grains nucleated and grew later than larger crystals, with the Lu-Hf dates serving as a record of the total growth time span.
Article
Geochemistry & Geophysics
Bin Wang, Chunjing Wei, Wei Tian, Ming Tang
Summary: This study investigates near-anhydrous garnet granitoids in the Jining Complex, North China, and reveals their high maficity, minimal H2O contents, and limited aluminum saturation indexes. It also shows that these magmas crystallize from melts with ultrahigh temperatures of 1000-1100 degrees C, as indicated by the presence of K-feldspar rich in anorthite and garnet rims depleted in heavy rare-earth elements.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(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
Geology
Carlos E. Ganade, Daniela Rubatto, Pierre Lanari, Joerg Hermann, Lucas R. Tesser, Renaud Caby
Summary: This study of ultrahigh-pressure (UHP) rocks reveals a comparable rate of exhumation in the Neoproterozoic and in modern collisional orogens, with significant implications for changes in the atmosphere and biosphere.
Article
Geosciences, Multidisciplinary
Saurabh Singh, Divya Prakash, Aditya Kharya, Himanshu K. Sachan
Summary: This study investigates the tectono-metamorphic evolution of the Mandikota area in the Eastern Ghats Mobile Belt using various methods including reaction textures, geothermobarometry, geochronology, fluid inclusions, and pseudosection modelling. The results reveal multiple metamorphic stages, including Ultra-High Temperature metamorphism, and a new age (-600 Ma) associated with the Pan-African orogeny. The study highlights the complexity and controversy of the tectono-metamorphic history in the Eastern Ghats Mobile Belt.
PRECAMBRIAN RESEARCH
(2023)
Article
Geochemistry & Geophysics
Lorraine Tual, Matthijs A. Smit, Jamie Cutts, Ellen Kooijman, Melanie Kielman-Schmitt, Jaroslaw Majka, Ian Foulds
Summary: Explore the timing and rate of subduction-zone metamorphism and H2O release by studying the compositional changes of garnet in blueschists and eclogites. A new protocol using low-loss micro-sampling by laser cutting combined with Lu-Hf chronology is developed. The study reveals extremely fast, pulsed garnet growth and near-instantaneous fluid release reactions in subduction zones.
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
Irena Miladinova, Nikolaus Froitzheim, Thorsten J. Nagel, Marian Janak, Raul O. C. Fonseca, Peter Sprung, Carsten Muenker
Summary: High- and ultrahigh-pressure rocks are found in the Austroalpine Nappes, with a field gradient of increasing pressure and temperature from the northwest to the southeast. Lu-Hf chronometry dates garnet growth, indicating a short-lived period of subduction. These findings suggest that subduction initiation occurred intracontinentally at the site of a Permian rift.
JOURNAL OF METAMORPHIC GEOLOGY
(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
Geosciences, Multidisciplinary
Wentao Cao, Hans-Joachim Massonne, Xiao Liang
Summary: Characterizing partial melting of eclogite in Precambrian orogens is crucial for understanding petrological processes in deep orogenic crust. Retrogressed eclogite samples from the Algonquin terrane show evidence of complex post-peak pressure evolution, with various exhumation- and melt-related textures forming.
PRECAMBRIAN RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Hao Cheng, Yumeng Liu, Jeffrey D. Vervoort, Honghua Lu
Article
Geosciences, Multidisciplinary
Hao Cheng, Tianyi Lu, Dadi Cao
Article
Geology
H. Cheng, X. C. Liu, J. D. Vervoort, D. Wilford, D. D. Cao
JOURNAL OF METAMORPHIC GEOLOGY
(2016)
Article
Geosciences, Multidisciplinary
Dadi Cao, Hao Cheng, Lingmin Zhang, Ke Wang
JOURNAL OF ASIAN EARTH SCIENCES
(2017)
Article
Geology
D. D. Cao, H. Cheng, L. Zhang
JOURNAL OF METAMORPHIC GEOLOGY
(2017)
Article
Geochemistry & Geophysics
Hao Cheng, Jeffrey D. Vervoort, Besim Dragovic, Diane Wilford, Lingmin Zhang
Article
Geosciences, Multidisciplinary
Dadi Cao, Hao Cheng, Lingmin Zhang, Ke Wang
JOURNAL OF ASIAN EARTH SCIENCES
(2018)
Article
Geology
Hao Cheng, Ying Zhou, Kai-Yang Du, Ling-Min Zhang, Tian-Yi Lu
JOURNAL OF METAMORPHIC GEOLOGY
(2018)
Article
Geochemistry & Geophysics
Hao Cheng, Jeffrey D. Vervoort
AMERICAN MINERALOGIST
(2015)
Article
Multidisciplinary Sciences
Hao Cheng, Huaiyang Zhou, Qunhui Yang, Lingmin Zhang, Fuwu Ji, Henry Dick
SCIENTIFIC REPORTS
(2016)
Article
Geochemistry & Geophysics
Hao Cheng, Elias M. Bloch, Evangelos Moulas, Jeffrey D. Vervoort
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2020)
Article
Geochemistry & Geophysics
Kai-Yang Du, Hao Cheng, Jeffrey D. Vervoort
Summary: This study presents an approach combining direct dating of garnet with accessory zircon petrochronology to provide diagnostic time constraints for polymetamorphic processes in high-temperature rocks. The rocks in North China Craton are found to have experienced coeval metamorphism from approximately 1.95-1.80 billion years ago, which is likely related to the amalgamation of the Columbia supercontinent.
Article
Geochemistry & Geophysics
Naixiao Xu, Lingmin Zhang, Huaiyang Zhou, Hao Cheng
Summary: The study discovered mosaic zircons in different rock types at different depths in the Southwest Indian Ridge, with mantle-like characteristics. The mosaic subdomains in a single zircon are correlated with trace elements and fractures, indicating that these variations were produced during crystallization and associated with brittle deformation.
Article
Geochemistry & Geophysics
Shengping Qian, Esteban Gazel, Alexander R. L. Nichols, Hao Cheng, Le Zhang, Vincent J. Salters, Jie Li, Xiaoping Xia, Huaiyang Zhou
Summary: This study on the lavas from seamounts in the South China Sea confirms that late Cenozoic lavas originate from recycled young oceanic crust and sediments, with an olivine-dominated mantle source and no high-He-3/He-4 mantle plume component. Late Cenozoic magmatism may be related to upwelling instabilities from the mantle transition zone, triggered by a stagnant slab. These findings provide additional evidence for the development of global mantle heterogeneities through the storage and recycling of crustal materials near or within the mantle transition zone.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)