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

Result code in 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>

Alternative codes found

RIV/00216208:11310/16:10331670

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

DB - Geology and mineralogy

OECD FORD branch

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Project

<a href="/en/project/GAP210%2F10%2F0249" target="_blank" >GAP210/10/0249: Early convergence and exhumation history of ultrahigh-pressure lithologies in the Variscan orogen</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2016

Confidentiality

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

Name of the periodical

Lithos

ISSN

0024-4937

e-ISSN

—

Volume of the periodical

264

Issue of the periodical within the volume

1 October

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

14

Pages from-to

56-69

UT code for WoS article

000387191600005

EID of the result in the Scopus database

2-s2.0-84983552287