Subduction-exhumation cycle recorded by calcite deformation microstructures: blueschist-facies metacarbonates and kinematic implications for deformation of the Meliata Unit (Western Carpathians)

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F23%3A10477682" target="_blank" >RIV/00216208:11310/23:10477682 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=SSaFikG7oR" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=SSaFikG7oR</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s00531-023-02344-z" target="_blank" >10.1007/s00531-023-02344-z</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Subduction-exhumation cycle recorded by calcite deformation microstructures: blueschist-facies metacarbonates and kinematic implications for deformation of the Meliata Unit (Western Carpathians)

Popis výsledku v původním jazyce

The Meliata Unit (Meliaticum) is a tectonic superunit of the Western Carpathians that incorporates the blueschists-facies Borka Nappe and the low-grade metasediments and polygenetic melange, Meliata Unit s.s., both occurring as scattered tectonic slices overlying the Gemeric Superunit. Calcitic marbles were sampled in a wide area within the Borka Nappe and blocks embedded in Jurassic oceanic sediments (Meliata Unit s.s.). Based on the microstructural evaluation and electron backscatter diffraction analysis (EBSD), the carbonates of the Borka Nappe experienced differential post-subduction P-T-D paths related to a collisional/exhumation setting following closure of the Neotethys-related &quot;Meliata Ocean&quot;. Variations in the calcite deformation microstructures were used to distinguish three principal microstructural groups. The first group (G1) contains large columnar and lobate calcite grains (&gt;= 1 mm) reflecting peak P-T conditions during subduction of the Meliata oceanic lithosphere. The second group (G2) exhibits dynamic recrystallization of the original G1 grains resulting in grain size reduction (&lt; 0.5 mm) and shape-preferred orientation related to exhumation and formation of the accretionary complex. The third group (G3) shows a &apos;foam&apos; microstructure with a uniform grain size (0.4-1 mm), sharp grain boundaries and triple junctions. The G3 microstructure may have been caused by a static recrystallization at elevated temperatures postdating the main deformation, and it is restricted to peripheries of the underlying Veporic metamorphic dome and probably is not associated with the Meliata sequences nor its tectono-metamorphic evolution. The corrected kinematic sections indicate dominantly ESE-WNW-trending lineations suggesting top-to-WNW kinematics of the Meliata subduction-exhumation process for G1 and G2 microstructures, and Gemeric-Veporic E-W orogen-parallel stretching for G3.

Název v anglickém jazyce

Subduction-exhumation cycle recorded by calcite deformation microstructures: blueschist-facies metacarbonates and kinematic implications for deformation of the Meliata Unit (Western Carpathians)

Popis výsledku anglicky

The Meliata Unit (Meliaticum) is a tectonic superunit of the Western Carpathians that incorporates the blueschists-facies Borka Nappe and the low-grade metasediments and polygenetic melange, Meliata Unit s.s., both occurring as scattered tectonic slices overlying the Gemeric Superunit. Calcitic marbles were sampled in a wide area within the Borka Nappe and blocks embedded in Jurassic oceanic sediments (Meliata Unit s.s.). Based on the microstructural evaluation and electron backscatter diffraction analysis (EBSD), the carbonates of the Borka Nappe experienced differential post-subduction P-T-D paths related to a collisional/exhumation setting following closure of the Neotethys-related &quot;Meliata Ocean&quot;. Variations in the calcite deformation microstructures were used to distinguish three principal microstructural groups. The first group (G1) contains large columnar and lobate calcite grains (&gt;= 1 mm) reflecting peak P-T conditions during subduction of the Meliata oceanic lithosphere. The second group (G2) exhibits dynamic recrystallization of the original G1 grains resulting in grain size reduction (&lt; 0.5 mm) and shape-preferred orientation related to exhumation and formation of the accretionary complex. The third group (G3) shows a &apos;foam&apos; microstructure with a uniform grain size (0.4-1 mm), sharp grain boundaries and triple junctions. The G3 microstructure may have been caused by a static recrystallization at elevated temperatures postdating the main deformation, and it is restricted to peripheries of the underlying Veporic metamorphic dome and probably is not associated with the Meliata sequences nor its tectono-metamorphic evolution. The corrected kinematic sections indicate dominantly ESE-WNW-trending lineations suggesting top-to-WNW kinematics of the Meliata subduction-exhumation process for G1 and G2 microstructures, and Gemeric-Veporic E-W orogen-parallel stretching for G3.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

International Journal of Earth Sciences

ISSN

1437-3254

e-ISSN

1437-3262

Svazek periodika

112

Číslo periodika v rámci svazku

September 2023

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

21

Strana od-do

2097-2117

Kód UT WoS článku

001094425600001

EID výsledku v databázi Scopus

2-s2.0-85170094814