Neogene–Quaternary magmatism and geodynamics in the Carpathian–Pannonian region: a synthesis

作者: Ioan Seghedi , Hilary Downes , Alexandru Szakács , Paul RD Mason , Matthew F Thirlwall

DOI: 10.1016/J.LITHOS.2003.08.006

关键词:

摘要: In the Carpathian–Pannonian region in Neogene times, westward-dipping subduction a land-locked basin caused collision of two lithospheric blocks (Alcapa and Tisia) with southeastern border European plate. Calc-alkaline alkaline magmatism was closely related to subduction, rollback, extension. From spatial distribution magmatic activity, four segments can be defined: Western Segment (magmatism occurring on Alcapa block), Central both Tisia blocks), South-Eastern Interior (both block). Most calc-alkaline resulted from melting heterogeneous asthenospheric mantle source modified by addition fluids sediment. Assimilation fractionation processes at shallow crustal levels occurred most segments, strongly masking deeper processes. Long-term rollback and/or delamination led contamination asthenosphere beneath Segment. Here, large-volume partial melts contaminated underplating anatexis, leading mixing mantle-derived magmas melts. Segment, were formed followed back-arc extension slab breakoff. Avariable is indicated setting larger amount fluid-induced metasomatism, enrichment assimilation nearer trench. evolution typical adakite-like ones due fast rotations transtensional tectonics. decompression crust–mantle lithosphere, while fliud-dominated lithosphere. Along breakoff responsible for generation calcalkaline magmas, but extreme south segment, level tearing Strike–slip tectonics allowed rise hot via slab-melting, along torn edge East Plate. Alkalic basaltic volcanism an OIB-like stage

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