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Anticlockwise metamorphic paths at ca.890–790 Ma from the NE Baidrag block,Mongolia,indicate back-arc compression at the Rodinia periphery

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Geoscience Frontiers 2023年第2期14卷 154-181页

作者： PavlaŠtípská vít peresty Igor Soejono Karel Schulmann RCAndrew Kylander-Clark Carmen Aguilar Stephen Collett Martin Racek Jitka Míková Otgonbaatar Dorjsuren Nikol Novotná Czech Geological Survey 11821 Praha 1Czech Republic Institute of Petrology and Structural Geology Charles University in PragueAlbertov 6Praha 212800Czech Republic Institut terre et Environnement de Strasbourg UMR 7063 Universitéde Strasbourg-CNRS1 Rue Blessig67084 StrasbourgCedexFrance Department of Earth Science University of CaliforniaSanta BarbaraCA 93106United States Department of Mineralogy Petrology and Applied GeologyFaculty of Earth ScienceUniversity of Barcelona08028 BarcelonaSpain Institute of Geology Mongolian Academy of SciencesLabor Union StreetSonginokhairkhan DistrictUlaanbaatar 18080Mongolia

the processes leading to the assembly of the Rodinia supercontinent through Grenvillian collisional orogeny are relatively well *** contrast,accretionary orogenic processes occurring at the supercontinent periphery following Rodinia assembly are poorly *** fill this gap,we have identified metamorphic rocks in the Mongolia collage of the Central Asian Orogenic Belt,where numerous data testify for Meso-to Neoproterozoic magmatic *** tectono-metamorphic evolution of the periSiberian tract of the Central Asian Orogenic Belt is mainly characterized by the late Proterozoic–early Cambrian(Baikalian)***,we document here a tonian age metamorphism at the northern part of the Precambrian Baidrag block,previously considered as a typical example of the Baikalian metamorphic *** study incorporates zircon and in-situ monazite geochronology linked to P-t modelling of Grt-Sil-Ky migmatite gneiss and Grt-St ***-Sil-Ky gneiss records initial burial to the sillimanite stability field at 720℃ and 6.0 kbar followed by further burial to the kyanite stability field at 750℃ and 9 kbar and decompression to 650℃ and 8 *** Grt-St schist records initial burial to the staurolite stability field at 620℃ and 6 kbar,followed by further burial to 590℃ and 8.5 *** monazite data yield a continuum of ^(207)Pb-corrected ^(238)U/^(206)Pb dates of ca.926–768 Ma in the Grt-Sil-Ky gneiss,and ca.937–754 Ma in the Grt-St *** on monazite textural positon,internal zoning,and REE patterns,the time of prograde burial to 6.0 kbar under a thermal gradient of 27–32℃/km is estimated at ca.890–853 *** is not clear whether such high-grade conditions prevailed until a phase of further burial under a geothermal gradient of 18–22℃/km dated at ca.835–815 *** late monazite recrystallization at ca.790 Ma is related to ***,monazite with dates of ca.568–515 Ma occur as whole grains or as rims with sharp boundaries on tonian monaz

关键词： Central Asian Orogenic Belt Grenvillian-age metamorphism Monazite in-situ U-Pb dating Monazite REE composition Zircon U-Pb dating thermodynamic modelling

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

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Geoscience Frontiers 2022年第3期13卷 177-195页

作者： Stephen Collett Karel Schulmann Piérig Deiller PavlaŠtípská vít peresty Marc Ulrich Yingde Jiang Luc de Hoÿm de Marien Jitka Míková Centre for Lithospheric Research Czech Geological SurveyKlárov 311821 Praha 1Czech Republic Institut terre et Environnement de Strasbourg UMR 7063 Universitéde Strasbourg—CNRS1 Rue Blessig67084 StrasbourgCedexFrance Institute of Petrology and Structural Geology Charles UniversityAlbertov 6Praha 212843Czech Republic State Key Laboratory of Isotope Geochemistry Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China Laboratories of the Czech Geological Survey Geologická615200 Praha 5Czech Republic

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.

关键词： variscan Orogeny Avalonian-Cadomian Orogeny Eclogite Geochemistry Zircon Lu-Hf geochronology

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