Dynamics of Saxothuringian subduction channel/wedge constrained by phase equilibria modelling and micro-fabric analysis

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F17%3A00464267" target="_blank" >RIV/67985530:_____/17:00464267 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00025798:_____/17:00000023

Výsledek na webu

<a href="http://dx.doi.org/10.1111/jmg.12226" target="_blank" >http://dx.doi.org/10.1111/jmg.12226</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1111/jmg.12226" target="_blank" >10.1111/jmg.12226</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Dynamics of Saxothuringian subduction channel/wedge constrained by phase equilibria modelling and micro-fabric analysis

Popis výsledku v původním jazyce

Subduction and exhumation dynamics can be investigated through analysis of metamorphic and deformational evolution of associated high-grade rocks. The Erzgebirge anticline, which forms at the boundary between the Saxothuringian and Tepla-Barrandian domains of the Bohemian Massif, provides a useful study area for these processes owing to the occurrence of numerous meta-basites preserving eclogite facies assemblages, and coesite and diamond bearing quartzofeldspathic lithologies indicating subduction to deep mantle depths. The prograde and retrograde evolution of meta-basite from the Czech portion of the Erzgebirge anticline has been constrained through a combination of thermodynamic modelling and conventional thermobarometry. Garnet growth zoning indicates that the rocks underwent burial and heating to peak conditions of 2.6 GPa and at least 615 degrees C. Initial exhumation occurred with concurrent cooling and decompression resulting in the growth of amphibole and zoisite poikiloblasts overgrowing and including the eclogite facies assemblage. The development of clinopyroxene-plagioclase-amphibole symplectites after omphacite and Al-rich rims on matrix amphibole indicate later heating at the base of the lower crust. Omphacite microstructures, in particular grain size analysis and lattice-preferred orientations, indicate that the prograde evolution was characterized by a constrictional strain geometry transitioning into plane strain and oblate fabrics during exhumation. The initial constrictional strain pattern is interpreted as being controlled by competing slab pull and crustal buoyancy forces leading to necking of the subducting slab. The transition to plane strain and flattening geometries represents transfer of material from the subducting lithosphere into a subduction channel, break-off of the dense slab and rebound of the buoyant crustal material.

Název v anglickém jazyce

Dynamics of Saxothuringian subduction channel/wedge constrained by phase equilibria modelling and micro-fabric analysis

Popis výsledku anglicky

Subduction and exhumation dynamics can be investigated through analysis of metamorphic and deformational evolution of associated high-grade rocks. The Erzgebirge anticline, which forms at the boundary between the Saxothuringian and Tepla-Barrandian domains of the Bohemian Massif, provides a useful study area for these processes owing to the occurrence of numerous meta-basites preserving eclogite facies assemblages, and coesite and diamond bearing quartzofeldspathic lithologies indicating subduction to deep mantle depths. The prograde and retrograde evolution of meta-basite from the Czech portion of the Erzgebirge anticline has been constrained through a combination of thermodynamic modelling and conventional thermobarometry. Garnet growth zoning indicates that the rocks underwent burial and heating to peak conditions of 2.6 GPa and at least 615 degrees C. Initial exhumation occurred with concurrent cooling and decompression resulting in the growth of amphibole and zoisite poikiloblasts overgrowing and including the eclogite facies assemblage. The development of clinopyroxene-plagioclase-amphibole symplectites after omphacite and Al-rich rims on matrix amphibole indicate later heating at the base of the lower crust. Omphacite microstructures, in particular grain size analysis and lattice-preferred orientations, indicate that the prograde evolution was characterized by a constrictional strain geometry transitioning into plane strain and oblate fabrics during exhumation. The initial constrictional strain pattern is interpreted as being controlled by competing slab pull and crustal buoyancy forces leading to necking of the subducting slab. The transition to plane strain and flattening geometries represents transfer of material from the subducting lithosphere into a subduction channel, break-off of the dense slab and rebound of the buoyant crustal material.

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

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Journal of Metamorphic Geology

ISSN

0263-4929

e-ISSN

—

Svazek periodika

35

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

28

Strana od-do

253-280

Kód UT WoS článku

000396743100001

EID výsledku v databázi Scopus

2-s2.0-85006057012