Lead isotope evolution of the Central European upper mantle:Constraints from the Bohemian Massif

作     者：Simona Krmíckova Lukas Krmícek Rolf L.Romer Jaromír Ulrych Simona Krmí?cková;Luká? Krmí?ek;Rolf L.Romer;Jaromír Ulrych

作者机构：Department of Geological SciencesFaculty of ScienceMasaryk UniversityKotlarska 2CZ-61137BrnoCzech Republic Institute of Geology of the Czech Academy of SciencesRozvojova 269CZ-16502Prague 6Czech Republic Brno University of TechnologyFaculty of Civil EngineeringAdMaS CentreVeverí95CZ-60200BrnoCzech Republic Deutsches GeoForschungsZentrum GFZTelegrafenbergD-14473PotsdamGermany 

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

年 卷 期：2020年第11卷第3期

页      面：925-942页

核心收录：

学科分类：070904[理学-构造地质学] 070902[理学-地球化学] 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] 0704[理学-天文学] 

基　　金：financially supported by the institutional project RVO 67985831 of the Institute of Geology of the Czech Academy of Sciences by the Brno University of Technology project LO1408“AdMaS UP-Advanced Materials,Structures and Technologies” supported by the Ministry of Education,Youth and Sports of the Czech Republic under the“National Sustainability Programme I” 

主　　题：Lead isotopes Lamprophyres Volcanic rocks Mantle components Bohemian massif Variscan orogeny 

摘      要：The Pb isotope composition of the upper mantle beneath Central Europe is heterogeneous due to the subduction of regionally contrasting material during the Variscan and Alpine *** Variscan to Cenozoic mantlederived melts allow mapping this heterogeneity on a regional scale for the last ca.340 *** Cretaceous and Cenozoic anorogenic magmatic rocks of the Bohemian Massif(lamprophyres,volcanic rocks of basanite/tephrite and trachyte/phonolite series) concentrate mostly in the Eger *** ultramafic lamprophyres yielded the most radiogenic Pb isotope signatures reflecting a maximum contribution from metasomatised lithospheric mantle,whereas Tertiary alkaline lamprophyres originated from mantle with less radiogenic ^(206)Pb/^(204)b ratios suggesting a more substantial modification of lithospheric source by interaction with asthenosphericderived *** volcanic rocks of the basanite/tephrite and trachyte/phonolite series define a linear mixing trend between these components,indicating dilution of the initial lithospheric mantle signature by upwelling asthenosphere during *** Pb isotope composition of Late Cretaceous and Cenozoic magmatic rocks of the Bohemian Massif follows the same Pb growth curve as Variscan orogenic lamprophyres and lamproites that formed during the collision between Laurussia,Gondwana,and associated *** implies that the crustal Pb signature in the post-Variscan mantle is repeatedly sampled by younger anorogenic *** Cenozoic mantle-derived rocks of Central Europe show similar Pb isotope ranges as the Bohemian Massif.