Metamorphic Evolution of Kyanite-Bearing Garnet Pyroxenites from the Variscan Orogenic Root: Gföhl Unit, Moldanubian Zone, Austria

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F25%3A10507692" target="_blank" >RIV/00216208:11310/25:10507692 - isvavai.cz</a>

Výsledek na webu

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

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/petrology/egaf013" target="_blank" >10.1093/petrology/egaf013</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Metamorphic Evolution of Kyanite-Bearing Garnet Pyroxenites from the Variscan Orogenic Root: Gföhl Unit, Moldanubian Zone, Austria

Popis výsledku v původním jazyce

Kyanite-bearing garnet pyroxenites occurring in centimetre to several hundred metres sized lenses of (ultra-)mafic lithologies embedded in felsic granulites of the Gfohl Unit in the south-eastern part of the Moldanubian Zone recorded a polyphase metamorphic evolution. An early high-pressure-high-temperature (HP-HT) stage at temperatures of 900 °C to 1000 °C and pressures in excess of 2 GPa is represented by the assemblage garnet-kyanite-omphacitic clinopyroxene-rutile (+/- quartz). Subsequent re-crystallisation under medium-pressure-high-temperature (MP-HT) conditions of about 1.0 to 1.3 GPa and 900 °C to 1000 °C is documented by the replacement of omphacitic clinopyroxene by symplectic intergrowth of diopsidic clinopyroxene and plagioclase, formation of sapphirine-bearing symplectites after kyanite, and a pronounced secondary compositional zoning of pre-existing garnet. Systematic compositional variations in the garnet cores over mm- to cm-sized mineralogically and microstructurally distinct domains indicate that equilibration volumes were small during the early HP-HT stage. In contrast, the compositions of the minerals that formed, or re-crystallised, during the MP-HT overprint are uniform throughout the samples, indicating substantially larger equilibration volumes during that stage. The metamorphic evolution is discussed in the light of deep subduction and relamination of felsic metaigneous crust, which subsequently experienced buoyancy-driven exhumation to mid-crustal levels and incorporated slivers of mafic and ultramafic material from the lithospheric mantle and lower crust en route.

Název v anglickém jazyce

Metamorphic Evolution of Kyanite-Bearing Garnet Pyroxenites from the Variscan Orogenic Root: Gföhl Unit, Moldanubian Zone, Austria

Popis výsledku anglicky

Kyanite-bearing garnet pyroxenites occurring in centimetre to several hundred metres sized lenses of (ultra-)mafic lithologies embedded in felsic granulites of the Gfohl Unit in the south-eastern part of the Moldanubian Zone recorded a polyphase metamorphic evolution. An early high-pressure-high-temperature (HP-HT) stage at temperatures of 900 °C to 1000 °C and pressures in excess of 2 GPa is represented by the assemblage garnet-kyanite-omphacitic clinopyroxene-rutile (+/- quartz). Subsequent re-crystallisation under medium-pressure-high-temperature (MP-HT) conditions of about 1.0 to 1.3 GPa and 900 °C to 1000 °C is documented by the replacement of omphacitic clinopyroxene by symplectic intergrowth of diopsidic clinopyroxene and plagioclase, formation of sapphirine-bearing symplectites after kyanite, and a pronounced secondary compositional zoning of pre-existing garnet. Systematic compositional variations in the garnet cores over mm- to cm-sized mineralogically and microstructurally distinct domains indicate that equilibration volumes were small during the early HP-HT stage. In contrast, the compositions of the minerals that formed, or re-crystallised, during the MP-HT overprint are uniform throughout the samples, indicating substantially larger equilibration volumes during that stage. The metamorphic evolution is discussed in the light of deep subduction and relamination of felsic metaigneous crust, which subsequently experienced buoyancy-driven exhumation to mid-crustal levels and incorporated slivers of mafic and ultramafic material from the lithospheric mantle and lower crust en route.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

<a href="/cs/project/GF20-24210L" target="_blank" >GF20-24210L: Metasomatóza ve spodní kůře (moldanubikum)</a><br>

Návaznosti

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

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Journal of Petrology

ISSN

0022-3530

e-ISSN

1460-2415

Svazek periodika

66

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

25

Strana od-do

egaf013

Kód UT WoS článku

001438823700001

EID výsledku v databázi Scopus

2-s2.0-86000482019