Coincidence of gabbro and granulite formation and their implication for Variscan HT metamorphism in the Moldanubian Zone (Bohemian Massif), example from the Kutná Hora Complex

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F16%3A00462061" target="_blank" >RIV/67985831:_____/16:00462061 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11310/16:10331670

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.lithos.2016.08.005" target="_blank" >http://dx.doi.org/10.1016/j.lithos.2016.08.005</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.lithos.2016.08.005" target="_blank" >10.1016/j.lithos.2016.08.005</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Coincidence of gabbro and granulite formation and their implication for Variscan HT metamorphism in the Moldanubian Zone (Bohemian Massif), example from the Kutná Hora Complex

Popis výsledku v původním jazyce

Leucocratic metagabbro and amphibolite from a mafic–ultramafic body within migmatite and granulite in the Kutná Hora Complex were investigated. The mafic–ultramafic rocks show amphibolite facies metamorphism, but in the central part of the body some metagabbro preserves cumulus and intercumulus plagioclase,nclinopyroxene and spinel. Spinel forms inclusions in both clinopyroxene and plagioclase and shows various degree of embayment structure, thatwas probably a result of reactionwith melt duringmagmatic crystallization. In the metagabbro, garnet forms coronae around clinopyroxene at the contacts with plagioclase. Amphibolite contains garnetwith prograde zoning and plagioclase. Phase relations of igneous and metamorphic minerals indicate thatmagmatic crystallization and subsequent metamorphismoccurred as a result of isobaric cooling at a depth of 30–35 km. U–Pb dating on zircon fromleucogabbro yielded a Variscan age (337.72Ma) that is similar or close to the age of granulite facies metamorphism (ca 340 Ma) in the Moldanubian Zone. Based on the calculated PT conditions and age data, both the mafic–ultramafic body and surrounding granulite shared the sameexhumation path fromtheir middle–lower crustal position at the end of Variscan orogeny. The coincidence ofmafic–ultramafic intrusives and granulite–amphibolite facies metamorphismis explained by lithospheric upwelling beneath thenMoldanubian Zone that occurred due to slab break-off during the final stages of subduction of the Moldanubian plate beneath the Teplá Barrandian Block. The model also addresses questions about the preservation of minerals and/or their compositions from the early metamorphic history of the rocks subjected to ultradeep subduction and subsequent granulite facies metamorphism.

Název v anglickém jazyce

Coincidence of gabbro and granulite formation and their implication for Variscan HT metamorphism in the Moldanubian Zone (Bohemian Massif), example from the Kutná Hora Complex

Popis výsledku anglicky

Leucocratic metagabbro and amphibolite from a mafic–ultramafic body within migmatite and granulite in the Kutná Hora Complex were investigated. The mafic–ultramafic rocks show amphibolite facies metamorphism, but in the central part of the body some metagabbro preserves cumulus and intercumulus plagioclase,nclinopyroxene and spinel. Spinel forms inclusions in both clinopyroxene and plagioclase and shows various degree of embayment structure, thatwas probably a result of reactionwith melt duringmagmatic crystallization. In the metagabbro, garnet forms coronae around clinopyroxene at the contacts with plagioclase. Amphibolite contains garnetwith prograde zoning and plagioclase. Phase relations of igneous and metamorphic minerals indicate thatmagmatic crystallization and subsequent metamorphismoccurred as a result of isobaric cooling at a depth of 30–35 km. U–Pb dating on zircon fromleucogabbro yielded a Variscan age (337.72Ma) that is similar or close to the age of granulite facies metamorphism (ca 340 Ma) in the Moldanubian Zone. Based on the calculated PT conditions and age data, both the mafic–ultramafic body and surrounding granulite shared the sameexhumation path fromtheir middle–lower crustal position at the end of Variscan orogeny. The coincidence ofmafic–ultramafic intrusives and granulite–amphibolite facies metamorphismis explained by lithospheric upwelling beneath thenMoldanubian Zone that occurred due to slab break-off during the final stages of subduction of the Moldanubian plate beneath the Teplá Barrandian Block. The model also addresses questions about the preservation of minerals and/or their compositions from the early metamorphic history of the rocks subjected to ultradeep subduction and subsequent granulite facies metamorphism.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

DB - Geologie a mineralogie

OECD FORD obor

—

Projekt

<a href="/cs/project/GAP210%2F10%2F0249" target="_blank" >GAP210/10/0249: Vývoj raní konvergence a exhumace ultravysokotlakých litologií ve variském orogénu</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Lithos

ISSN

0024-4937

e-ISSN

—

Svazek periodika

264

Číslo periodika v rámci svazku

1 October

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

14

Strana od-do

56-69

Kód UT WoS článku

000387191600005

EID výsledku v databázi Scopus

2-s2.0-84983552287