Počet záznamů: 1
Role of strain localization and melt flow on exhumation of deeply subducted continental crust
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SYSNO ASEP 0494976 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Role of strain localization and melt flow on exhumation of deeply subducted continental crust Tvůrce(i) Závada, Prokop (GFU-E) ORCID, RID
Schulmann, K. (CZ)
Racek, M. (CZ)
Hasalová, P. (CZ)
Jeřábek, P. (CZ)
Weinberg, R. F. (AU)
Štípská, P. (CZ)
Roberts, A. (AU)Zdroj.dok. Lithosphere. - : GeoScienceWorld - ISSN 1941-8264
Roč. 10, č. 2 (2018), s. 217-238Poč.str. 22 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova Central European Variscides ; Bohemian massif ; partially molten rocks Vědní obor RIV DB - Geologie a mineralogie Obor OECD Geology CEP GA14-15632S GA ČR - Grantová agentura ČR Institucionální podpora GFU-E - RVO:67985530 UT WOS 000433166500003 EID SCOPUS 85044764112 DOI 10.1130/L666.1 Anotace A section of anatectic felsic rocks from a high-pressure (>13 kbar) continental crust (Variscan Bohemian Massif) preserves unique evidence for coupled melt flow and heterogeneous deformation during continental subduction. The section reveals layers of migmatitic granofels interlayered with anatectic banded orthogneiss and other rock types within a single deformation fabric related to the prograde metamorphism. Granofels layers represent high strain zones and have traces of localized porous melt flow that infiltrated the host banded orthogneiss and crystallized granitic melt in the grain interstices. This process is inferred from: (1) gradational contacts between orthogneiss and granofels layers, (2) grain size decrease and crystallographic preferred orientation of major phases, compatible with oriented growth of crystals from interstitial melt during granular flow, accommodated by melt-assisted grain boundary diffusion creep mechanisms, and (3) pressure-temperature equilibria modeling showing that the melts were not generated in situ. We further argue that this porous melt flow, focused along the deformation layering, significantly decreases the strength of the crustal section of the subducting continental lithosphere. As a result, detachment folds develop that decouple the shallower parts of the layered anatectic sequence from the underlying and continuously subducting continental plate, which triggers exhumation of this anatectic sequence. Pracoviště Geofyzikální ústav Kontakt Hana Krejzlíková, kniha@ig.cas.cz, Tel.: 267 103 028 Rok sběru 2019
Počet záznamů: 1