Metasomatic Interaction of Ultramafic Mantle Xenoliths with their Felsic HP-UHT Granulite Host (Moldanubian Domain, Bohemian Massif in Lower Austria)

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F24%3A10485654" target="_blank" >RIV/00216208:11310/24:10485654 - isvavai.cz</a>

Alternative codes found

RIV/00025798:_____/24:10169311

Result on the web

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=POH6M268nH" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=POH6M268nH</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/petrology/egae075" target="_blank" >10.1093/petrology/egae075</a>

Result language

angličtina

Original language name

Metasomatic Interaction of Ultramafic Mantle Xenoliths with their Felsic HP-UHT Granulite Host (Moldanubian Domain, Bohemian Massif in Lower Austria)

Original language description

The St. Leonhard granulite massif in Lower Austria, dominantly formed by kyanite-bearing felsic granulite, encloses countless up to 5 cm sized mantle xenoliths of garnet clinopyroxenite and peridotite. The mineralogical, textural and chemical consequences of a mutual metasomatic interaction at the contact between these xenoliths and the host orthopyroxene-bearing felsic granulite are described. Movement of Mg, Al and, especially, Ca from the garnet clinopyroxenite to the granulite and migration of K and Na in the opposite direction, caused the breakdown of clinopyroxene and formation of orthopyroxene-plagioclase symplectite coronae at the expense of the garnet clinopyroxenite xenoliths. Around the peridotite xenoliths, monomineralic orthopyroxene coronae have developed due to the supply of Si from the host granulite. The P-T conditions of this interaction were established to 900 °C to 1000 °C and 1.0 to 1.2 GPa by thermodynamic modelling. The duration of coronae growth was constrained to 13 to 532 ka based on modelling of Fe-Mg interdiffusion underlying secondary compositional zoning of garnet from the garnet clinopyroxenite xenolith extending to the coronae. The most significant change in the host granulite was caused by the supply of Ca from the garnet clinopyroxenite xenolith, which led to the breakdown of the Al2SiO5 phase-probably kyanite-and stabilization of orthopyroxene. K-feldspar-poor haloes surrounding mantle xenoliths formed due to the depletion of K in the granulite adjacent to the garnet clinopyroxenite. The observed origin of felsic-intermediate orthopyroxene-bearing granulite by transformation of felsic kyanite-bearing granulite through the metasomatic interaction with mantle xenoliths implies that the deep crustal chemical exchange between mantle- and crust-derived lithologies may have an important consequences on composition, thermal structure and geodynamic evolution of orogenic lower crust especially in hot collisional orogens, such as the European Variscides.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10505 - Geology

Project

<a href="/en/project/GF20-24210L" target="_blank" >GF20-24210L: Moldanubian Deep crustal Metasomatism (MODEM)</a><br>

Continuities

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

Publication year

2024

Confidentiality

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

Name of the periodical

Journal of Petrology

ISSN

0022-3530

e-ISSN

1460-2415

Volume of the periodical

65

Issue of the periodical within the volume

7

Country of publishing house

GB - UNITED KINGDOM

Number of pages

22

Pages from-to

egae075

UT code for WoS article

001277874200003

EID of the result in the Scopus database

2-s2.0-85199766073