Reconstruction of the mid-Devonian HP-HT metamorphic event in the Bohemian Massif(European Variscan belt)

作     者：Stephen Collett Karel Schulmann Piérig Deiller PavlaŠtípská Vít Peresty Marc Ulrich Yingde Jiang Luc de Hoÿm de Marien Jitka Míková Stephen Collett;Karel Schulmann;Piérig Deiller;Pavla ?típská;Vít Pe?esty;Marc Ulrich;Yingde Jiang;Luc de Ho?m de Marien;Jitka Míková

作者机构：Centre for Lithospheric ResearchCzech Geological SurveyKlárov 311821 Praha 1Czech Republic Institut Terre et Environnement de StrasbourgUMR 7063 Universitéde Strasbourg—CNRS1 Rue Blessig67084 StrasbourgCedexFrance Institute of Petrology and Structural GeologyCharles UniversityAlbertov 6Praha 212843Czech Republic State Key Laboratory of Isotope GeochemistryGuangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China Laboratories of the Czech Geological SurveyGeologická615200 Praha 5Czech Republic 

出 版 物：《Geoscience Frontiers》 (地学前缘（英文版）)

年 卷 期：2022年第13卷第3期

页      面：177-195页

核心收录：

学科分类：070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学] 070901[理学-矿物学、岩石学、矿床学] 0708[理学-地球物理学] 

基　　金：funded by the Grant Agency of the Czech Republic(GACR)project 19-25035S to P.Štípskáand the International Partnership Program of CAS 773(132744KYSB20190039)to Y.Jiang Institutional supports of the Research Project no.310760(Strategic Research Plan of the Czech Geological Survey-DKRVO/CGS 2018-2022) Centre for Geosphere Dynamics(UNCE/SCI/006)of Faculty of Sciences,Charles University 

主　　题：Variscan Orogeny Avalonian-Cadomian Orogeny Eclogite Geochemistry Zircon Lu-Hf geochronology 

摘      要：Mid-Devonian high-pressure(HP)and high-temperature(HT)metamorphism represents an enigmatic early phase in the evolution of the Variscan *** the Bohemian Massif this metamorphism is recorded mostly in allochthonous complexes with uncertain relationship to the major tectonic *** this regard,the MariánskéLázně Complex(MLC)is unique in its position at the base of its original upper plate(Teplá-Barrandian Zone).The MLC is composed of diverse,but predominantly mafic,magmatic-metamorphic rocks with late Ediacaran to mid-Devonian protolith ***-Devonian HP eclogite-facies metamorphism was swiftly followed by a HT granulite-facies overprint contemporaneous with the emplacement of magmatic rocks with apparent supra-subduction *** Hf in zircon isotopic measurements combined with a review of whole-rock isotopic and geochemical data reveals that the magmatic protoliths of the MLC,as well as in the upper plate Teplá-Barrandian Zone,developed above a relatively unaltered Neoproterozoic lithospheric *** remained coupled with this lithospheric mantle throughout a geological timeframe that encompasses separate Ediacaran and Cambrian age arc magmatism,protracted early Paleozoic rifting,and the earliest phases of the Variscan *** results are presented in the context of reconstructing the original architecture of the Variscan terranes up to and including the mid-Devonian HP-HT event.