Naslov
The Moslavacka Gora Massif in Croatia

Autori
Starijaš, Biljana ; Gerdes, Axel ; Finger, Friedrich ; Mayer, Andreas ; Humer, Bernhard ; Balen, Dražen ; Tibljaš, Darko

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Journal of Alpine Geology, 49 / - Beč, 2008, 103-103

Skup
PANGEO 2008:Kurzfassungen und Abstracts

Mjesto i datum
Beč, Austrija, 22.09.2008. - 25.09.2008

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
zircon ; granite ; Moslavačka Gora ; Croatia

Sažetak
The Moslavaèka Gora Massif is located about 50 km east-south-east of Zagreb and represents one of the major outcrops ofcrystalline basement within the Tertiary sediments of thePannonian basin (PAMIC et al. 2002). The central part of the massifis built up of fine grained, mostly undeformed granite (Pleteracgranite). The peripheral parts are dominated by metamorphicrocks. They include coarse and fine grained migmatitic metagranites(Jelen-grad, Gariæ-grad metagranite) as well as minor occurrencesof amphibolites and metapelites.The Moslavaèka Gora Massif has been considered as a majoroutcrop of Variscan crystalline basement of the south Tisia block.However, electron-microprobe-based Th-U-Pb dating onmonazites from the granitic as well as the metamorphic rocksprovide almost exclusively Cretaceous ages. Just in one sampleof a metapelite, relics of monazites with a Permian age werefound (STARIJAŠ et al. 2006). LA-ICP-MS U-Pb dating of zirconsgave Lower Ordovician formation ages for the metagranitic rocks(Gariæ-grad metagranite: 486 ± 6 Ma, 483 ± 6 Ma ; Jelen-gradmetagranite: 491 ± 2 Ma). For the Pleterac granite, a Cretaceousformation age of 82 ± 1 Ma was obtained.The Cretaceous metamorphism in the Moslavacka Gora Massifwas of the low-pressure type and reached, at least in places, granulite facies conditions (700-750°C, 3-4 kbar). According tothe available monazite ages, high-grade metamorphism occurredin the mid Cretaceous. A retrograde metamorphic event, whichmay be related to the intrusion of the Pleterac granite, occurredunder conditions of ca. 550°C and 3 kbar.Based on the new geochronological data, a correlation of theMoslavaèka Gora Massif with the Banatite magmatic belt of south-eastern Europe may be possible. According to NEUBAUER (2002)the Banatite belt may have formed as a consequence of post-collisional slab break-off, representing a long but narrow zonewith increased heat input from the asthenospheric mantle. Thehigh T/ low P metamorphism recorded within the MoslavaèkaGora Massif would be compatible with such a model. Chemicaldata indicate that the Pleterac granite is most likely derived froma crustal source and not from a mantle source, as most magmas of the Banatite belt are. However, the Pleterac granite may haveformed as secondary magma in the contact aureole of hot maficmantle melts ponding at the base of the crust.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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