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Unravelling the protracted U-Pb zircon geochronological record of high to ultrahigh temperature metamorphic rocks:Implications for provenance investigations

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Geoscience Frontiers 2023年第2期14卷 116-132页

作者： Mahyra Tedeschi Pedro Leonardo Rossi Vieira Matheus Kuchenbecker Bruno VRibeiro Vitor Barrote Humberto Reis Laura Stutenbecker Cristiano Lana Antonio Pedrosa-Soares ivo dussin Programa de Pós-graduação em Geologia da Universidade Federal de Minerais Centro de Pesquisas Manoel Teixeira da CostaInstitute of GeosciencesFederal University of Minas GeraisAv.Antônio Carlos6627Belo Horizonte 31270-901Brazil Institute of Geological Sciences University of Bern3012 BernSwitzerland Laboratório de Estudos Tectônicos Universidade Federal dos Vales do Jequitinhonha e MucuriRodovia MGT 367Km 583-Diamantina 39100-000Brazil School of Earth Atmosphere and EnvironmentMonash UniversityClaytonVictoria 3800Australia Timescales of Mineral Systems Group School of Earth and Planetary SciencesCurtin UniversityPerthWA 6845Australia Freie Universität Berlin Institut für Geologische WissenschaftenGeochemieMalteserstr.1074-10012249 BerlinGermany Departamento de Geologia-Escola de Minas Universidade Federal de Ouro Preto 35400-000Brazil Department of Materials and Earth Sciences Institute of Applied GeosciencesTU DarmstadtSchnittspahnstr.964287 DarmstadtGermany TEKTOS Geotectonic Research Group Geology InstituteRio de Janeiro State UniversitySão Francisco Xavier Street524/4030-AMaracanãRio de Janeiro 20550-900Brazil

The assessment of detrital zircon age records is a key method in basin analysis,but it is prone to several biases that may compromise accurate sedimentary provenance *** to ultrahigh temperature(HT-UHT)metamorphism(especially if T>850℃)is herein presented as a natural cause of bias in provenance studies based on U-Pb detrital zircon ages,since zircon from rocks submitted to these extreme and often prolonged conditions frequently yield protracted,apparently concordant,geochronological *** age spreading can result from disturbance of the primary U-Pb zircon system,likewise from(re)crystallization processes during multiple and/or prolonged metamorphic *** this contribution,available geochronological data on Archean,Neoproterozoic and Palaeozoic HT-UHT metamorphic rocks,acquired by different techniques(SIMS and LA-ICP-MS)and showing distinct compositions,are reassessed to demonstrate HT-UHT metamorphism may result in modes and age distributions of unclear geological *** a consequence,it may induce misinterpretations on UPb detrital zircon provenance analyses,particularly in sedimentary rocks metamorphosed under such extreme temperature *** evaluate the presence of HT-UHT metamorphism-related bias in the detrital zircon record,we suggest a workflow for data acquisition and interpretation,combining a multi-proxy approach with:(i)in situ U-Pb dating coupled with Hf analyses to retrieve the isotopic composition of the sources,and(ii)the integration of a petrochronological investigation to typify fingerprints of the HT-UHT metamorphic *** proposed workflow is validated in the investigation of one theoretical and one natural example allowing a better characterization of the sedimentary sources,maximum depositional ages,and the tectonic setting of the *** workflow allows to the appraisal of biases imposed by HT-UHT metamorphism and resulting disturbances in the U-Pb detrital zircon record,particularly for sedimentary

关键词： Detrital zircon Protracted zircon record Sedimentary basins UHT metamorphism Prolonged metamorphism Bias in detrital zircon

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Rhyacian-Orosirian tectonic history of the Juiz de Fora Complex:Evidence for an Archean crustal reservoir within an island-arc system

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Geoscience Frontiers 2022年第5期13卷 350-369页

作者： Rasec Almeida Vitalino Elizeu Henrique Bruno Samuel Moreira Bersan Lucas Eduardo de Abreu Barbosa Araujo ivo dussin Claudio de Morisson Valeriano Carla Neto Monica Heilbron Universidade do Estado do Rio de Janeiro Faculdade de GeologiaTektos–Grupo de Pesquisa em GeotectônicaRua São Francisco Xavier 524MaracanãRio de JaneiroBrazil Laboratório de Geocronologia e Isótopos Radiogênicos Universidade do Estado do Rio de JaneiroRua São Francisco Xavier 524MaracanãRio de JaneiroBrazil

The southern São Francisco Paleocontinent(SFP)comprises Archean nuclei and Paleoproterozoic complexes encompassing magmatic arcs juxtaposed during a Rhyacian to Orosirian orogenic *** Juiz de Fora Complex(JFC)represents an imbricated thrust system that comprises orthogranulites with a wide compositional range formed in an intra-oceanic setting during the Siderian to the Orosirian and later accreted to the southeastern margin of the *** we report new petrological,geochemical,whole-rock Nd and Sr data,as well as zircon U–Pb ages from felsic and mafic orthogranulites from the *** new data is combined with a regional compilation that enables an evaluation of the interaction between magmatism and orogenetic episodes in the context of the consolidation of São Francisco Paleocontinent during the Rhyacian–*** collisional Island Arc tholeiites(IAT),Tonalites-Tron dhjemites-Granodiorites(TTGs)and sanukitoid magmatism occurred from 2200 Ma to 2085 *** was followed by post-collisional magmatism,which is represented by hybrid granitoids coeval with the emplacement of E-MORB basic *** signatures for the Rhyacian to Orosirian evolution are highlighted by the dominance of negativeεNd(t)associated with Meso-to Neoarchean Nd TDMmodel ages as well as inherited zircon grains from the hybrid *** JFC is extensively highlighted in the literature as a primitive intra-oceanic arc,but here we propose the reworking or recycling of ancient crustal segments within the mature arc stage of the JFC,suggesting a Mesoarchean crustal source involved in the JFC evolution.

关键词： Juiz de Fora complex Paleoproterozoic magmatic arc TTG and sanukitoid São Francisco Paleocontinent

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Neoarchean and Rhyacian TTG-Sanukitoid suites in the southern S?o Francisco Paleocontinent,Brazil:Evidence for diachronous change towards modern tectonics

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Geoscience Frontiers 2020年第5期11卷 1763-1787页

作者： Henrique Bruno Vitalino Elizeu Monica Heilbron Claudio de Morisson Valeriano Rob Strachan Mike Fowler Samuel Bersan Hugo Moreira ivo dussin Luiz Guilherme do Eirado Silva Miguel Tupinamba Julio Almeida Carla Neto Craig Storey Universidade Do Estado Do Rio de Janeiro Faculdade de GeologiaTektosGrupo de Pesquisa Em GeotectonicaRua Sao Francisco Xavier 524MaracanaRio de JaneiroBrazil University of Portsmouth School of Earth and Environmental SciencesBurnaby BuildingBurnaby RoadPortsmouthUK Universit€at Salzburg Department of Geography and GeologyKapitelgasse4-65020SalzburgAustria Universidade Federal de Ouro Preto Departamento de GeologiaCampus Morro Do CruzeiroOuro PretoMGBrazil Laboratorio de Geocronologia e Isotopos Radiog^enicos Universidade Do Estado Do Rio de JaneiroRua Sao Francisco Xavier 524MaracanaRio de JaneiroBrazil

The southern portion of the Sao Francisco Palaeocontinent in Brazil is denoted by Archean nuclei and Paleoproterozoic magmatic arcs that were amalgamated during Siderian to Orosirian orogenic processes(ca.2.4-2.1 Ga).New isotopic U-Pb in zircon and Sm-Nd whole rock combined with major and trace element composition analyses constrain the crystallization history of the Neoarchean Piedade block(at ca.2.6 Ga)and the Paleoproterozoic Mantiqueira Complex(ca.2.1-1.9 Ga).These therefore display quite different magmatic histories prior to their amalgamation at ca.2.05 ***-Nd and Rb-Sr isotopes imply a mixed mantle-crustal origin for the samples in both units.A complete Palaeoproterozoic orogenic cycle,from subduction to collision and collapse,is recorded in the Piedade Block and the Mantiqueira *** to Orosirian subduction processes(ca.2.2-2.1 Ga)led to the generation of coeval(ca.2.16 Ga)TTG suites and sanukitoids,followed by late(2.10-2.02 Ga)high-K granitoids that mark the collisional *** collisional accretion of the Mantiqueira Complex against the Piedade Block at 2.08-2.04 Ga is also recorded by granulite facies metamorphism in the latter terrane,along the Ponte Nova suture *** collisional stage was closely followed by the emplacement of within-plate tholeiites at ca.2.04 Ga and by alkaline rocks(syenites and enriched basic rocks)at ca.1.98 Ga,marking the transition to an extensional tectonic *** discovery of two episodes of TTG and sanukitoid magmatism,one during the Neoarchean in the Piedade Complex and another during the Rhyacian in the Mantiqueira Complex,indicates that the onset of subduction-related melting of metasomatized mantle was not restricted to Neoarchean times,as generally believed,but persisted much later into the Paleoproterozoic.

关键词： Geodynamics High Ba–Sr granitoids Diachronous TTG-Sanukitoid transition Paleoproterozoic Mantiqueira complex

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Analysis of a passive ankle exoskeleton for reduction of metabolic costs during walking

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Defence Technology（防务技术） 2024年第7期37卷 62-68页

作者： Luís Quinto Pedro Pinheiro Sergio B.Goncalves ivo Roupa Paula Simoes Miguel Tavares da Silva CINAMIL Academia MilitarInstituto Universitario MilitarLisbonPortugal IDMEC Instituto Superior TecnicoUniversidade de LisboaLisbonPortugal

Modern conflicts demand substantial physical and psychological exertion,often resulting in fatigue and diminished combat or operational *** exoskeletons have been developed recently to address these challenges,presenting various limitations that affect their operational or everyday *** article evaluates the performance of a dual-purpose passive ankle exoskeleton developed for the reduction of metabolic costs during walking,seeking to identify a force element that could be applied to the target *** on the 6-min walk test,twenty-nine subjects participated in the study using three different force *** results indicate that it is possible to reduce metabolic expenditure while using the developed ***,the comfort and range of motion results verify the exoskeleton's suitability for use in uneven terrain and during extended ***,the choice of the force element should be tailored to each user,and the control system should be adjustable to optimise the exoskeleton's performance.

关键词： Ankle passive exoskeleton Metabolic cost reduction Dual-use exoskeleton Gait Biomechanics

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Anomalies in the short-range local environment and atomic diffusion in single crystalline equiatomic CrMnFeCoNi highentropy alloy

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Nano Research 2024年第6期17卷 5336-5348页

作者： Alevtina Smekhova Daniel Gaertner Alexei Kuzmin Ana Guilherme Buzanich Goetz Schuck ivo Zizak Gerhard Wilde Kirill V.Yusenko Sergiy Divinski Helmholtz-Zentrum Berlin für Materialien und Energie(HZB) D-12489 BerlinGermany Institute of Materials Physics University of MünsterD-48149 MünsterGermany Institute of Solid State Physics University of LatviaLV-1063 RigaLatvia Bundesanstalt für Materialforschung und–prüfung(BAM) D-12489 BerlinGermany

Multi-edge extended X-ray absorption fine structure(EXAFS)spectroscopy combined with reverse Monte Carlo(RMC)simulations was used to probe the details of element-specific local coordinations and component-dependent structure relaxations in single crystalline equiatomic CrMnFeCoNi high-entropy alloy as a function of the annealing *** representative states,namely a high-temperature state,created by annealing at 1373 K,and a low-temperature state,produced by long-term annealing at 993 K,were compared in *** features identified in atomic configurations of particular principal components indicate variations in the local environment distortions connected to different degrees of compositional disorder at the chosen representative *** detected changes provide new atomistic insights and correlate with the existence of kinks previously observed in the Arrhenius dependencies of component diffusion rates in the CrMnFeCoNi high-entropy alloy.

关键词： high-entropy alloys diffusion short-range order extended X-ray absorption fine structure(EXAFS) reverse Monte Carlo

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Influence of processing history on microstructure， mechanical properties， and electrical conductivity of Cu-0.7Mg alloy

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Transactions of Nonferrous Metals Society of China 2024年

作者： Alireza KALHOR Kinga RODAK Marek TKOCZ Bartosz CHMIELA ivo SCHINDLER ?ukasz POLOCZEK Krzysztof RADWA?SKI Hamed MIRZADEH Marian KAMPIK Faculty of Materials Engineering， Silesian University of Technology V?B – Technical University of Ostrava， Faculty of Materials Science and Technology Materials Research Group， ?ukasiewicz Upper Silesian Institute of Technology School of Metallurgy and Materials Engineering， College of Engineering， University of Tehran Faculty of Electrical Engineering， Silesian University of Technology

The effects of forward extrusion as well as extrusion combined with reversible torsion (KoBo extrusion)， followed by additional deformation via the MaxStrain module of the Gleeble thermomechanical simulator， on the microstructure， mechanical properties， and electrical conductivity of a Cu-0.7Mg (wt.%) alloy， were investigated in this work. The simulation results highlighted the critical influence of processing history in determining the equivalent strain distribution. The sample subjected to forward extrusion at 400 ℃and subsequent MaxStrain processing (FM sample)， possessed 76% lower grain size compared to the sample processed solely with MaxStrain (AM sample). Likewise， the KoBo-extruded and MaxStrain-processed sample (KM sample) exhibited 66% smaller grain size compared to the AM sample. Tensile test results revealed that the AM， FM， and KM samples， respectively， possessed 251%， 288%， and 360% higher yield strength， and 95%， 121%， and 169% higher tensile strength compared to the initial annealed alloy， as a result of grain refinement as well as deformation strengthening. Finally， the electrical conductivity measurements revealed that AM， FM， and KM samples， respectively， possessed electrical conductivity values of 37.9， 35.6， and 32.0 (MS/m)， which， considering their mechanical properties， makes them eligible to be categorized as high-strength and high-conductivity copper alloys.

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不同时代的赞美波瓦-迪瓦尔津Edifício A'mar建筑改造

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室内设计与装修 2024年第8期 130-135页

作者： [葡萄牙]REM’A ivo Tavares Studio(摄影) 夕阳(编译) REM'A

历史建筑Edifício A'mar位于葡萄牙波瓦-迪瓦尔津,它不仅受到市政分类保护的限制,还在当地居民心目中占有特殊地位,是城市集体记忆的重要组成部分。设计师的研究揭示了一个引人入胜的背景故事——前任业主是一位阅历丰富的旅行家,他将... 详细信息

历史建筑Edifício A'mar位于葡萄牙波瓦-迪瓦尔津,它不仅受到市政分类保护的限制,还在当地居民心目中占有特殊地位,是城市集体记忆的重要组成部分。设计师的研究揭示了一个引人入胜的背景故事——前任业主是一位阅历丰富的旅行家,他将自己的环球经历融入了这座建筑的设计理念中,最终创造出一座独特的折中主义和新文艺复兴风格的建筑杰作。设计师将这种风格称为“反应式”建筑。这项建筑工程的目标是在保护与创新之间创造一种微妙的平衡,不是对原有结构的批评,而是致敬建筑的2个不同建造时期。

关键词：当地居民分类保护建筑改造阅历丰富原有结构迪瓦尔背景故事建筑工程

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Bogomolov Multipliers for Some p-groups of Nilpotency Class 2

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Acta Mathematica Sinica,English Series 2016年第5期32卷 541-552页

作者： ivo MICHAILOV Faculty of Mathematics and Informatics Shumen University "Episkop Konstantin Preslavski"

The Bogomolov multiplier B0 （G） of a finite group G is defined as the subgroup of the Schur multiplier consisting of the cohomology classes vanishing after restriction to all abelian subgroups of G. The triviality of the Bogomolov multiplier is an obstruction to Noether＇s problem. We show that if G is a central product of G1 and G2, regarding Ki ≤ Z（Gi）,i = 1,2, and θ ： G1 →G2 is a group homomorphism such that its restriction θ｜K1 ： K1 → K2 is an isomorphism, then the triviality of Bo（G1/K1）, Bo（G1） and B0（G2） implies the triviality of Bo（G）. We give a positive answer to Noether＇s problem for all 2-generator p-groups of nilpotency class 2, and for one series of 4-generator p-groups of nilpotency class 2 （with the usual requirement for the roots of unity）.

关键词： Bogomolov multiplier Noether's problem rationality problem central product of groups p-groups of nilpotency class 2

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海风轻轻吹阿威罗盐色之家

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室内设计与装修 2024年第8期 44-49页

作者： [葡萄牙]Rómulo De Almeida Neto ivo Tavares Studio(摄影) 西竹(编译) 不详

盐色之家(Salt Color House)位于阿威罗新海岸绿地(Costa Nova do Prado)一个被称为Mira channel的海峡沿岸。由于海水和周围植被的盐度,这个地方的颜色和散发的气味让建筑师回想起过去的时光,唤醒了童年在类似海洋氛围中的居住记忆。... 详细信息

盐色之家(Salt Color House)位于阿威罗新海岸绿地(Costa Nova do Prado)一个被称为Mira channel的海峡沿岸。由于海水和周围植被的盐度,这个地方的颜色和散发的气味让建筑师回想起过去的时光,唤醒了童年在类似海洋氛围中的居住记忆。在构思这个项目的时候,建筑师面临着巨大的挑战。一方面要抱有建筑理性的创造性,同时也要切换使用者的身份去权衡整体的使用需求。

关键词： House 海风轻轻吹建筑师

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Magnetically modified microbial cells:A new type of magnetic adsorbents

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China Particuology 2007年第1期5卷 19-25页

作者： ivo Safarik Mirka Safarikova Department of Biomagnetic Techniques Institute of Systems Biology and Ecology Academy of Sciences Na Sadkach 7 370 05 Ceske Budejovice Czech Republic

Microbial cells, either in free or immobilized form, can be used for the preconcentration or removal of metal ions, organic and inorganic xenobiotics or biologically active compounds. Magnetic modification of these cells enables to prepare magnetic adsorbents that can be easily manipulated in difficult-to-handle samples, such as suspensions, in the presence of external magnetic field. In this review, typical examples of magnetic modifications of microbial cells are presented, as well as their possible applications for the separation of organic xenobiotics and heavy metal ions.

关键词： Microbial cells Magnetic modification Magnetic iron oxide nanoparficles Magnetic adsorbents Magnetic fluids Xenobiotics

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