Role of strain localization and melt flow on exhumation of deeply subducted continental crust

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F18%3A00000134" target="_blank" >RIV/00025798:_____/18:00000134 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985530:_____/18:00494976 RIV/00216208:11310/18:10380149

Výsledek na webu

<a href="https://pubs.geoscienceworld.org/gsa/lithosphere/article/10/2/217/525852/Role-of-strain-localization-and-melt-flow-on" target="_blank" >https://pubs.geoscienceworld.org/gsa/lithosphere/article/10/2/217/525852/Role-of-strain-localization-and-melt-flow-on</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1130/L666.1" target="_blank" >10.1130/L666.1</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Role of strain localization and melt flow on exhumation of deeply subducted continental crust

Popis výsledku v původním jazyce

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) pressuretemperature 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.

Název v anglickém jazyce

Role of strain localization and melt flow on exhumation of deeply subducted continental crust

Popis výsledku anglicky

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) pressuretemperature 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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Lithosphere

ISSN

1941-8264

e-ISSN

—

Svazek periodika

10

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

22

Strana od-do

217-238

Kód UT WoS článku

000433166500003

EID výsledku v databázi Scopus

2-s2.0-85044764112