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A distinct tectono-metamorphic evolution at the southern edge of Tisia Mega-Unit revealed by monazite and xenotime age dating (CROSBI ID 599397)

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Balen, Dražen ; Horváth, Peter ; Finger, Fritz ; Konečný, Patrik A distinct tectono-metamorphic evolution at the southern edge of Tisia Mega-Unit revealed by monazite and xenotime age dating // Mineralogical magazine. 2013. str. 647-647

Podaci o odgovornosti

Balen, Dražen ; Horváth, Peter ; Finger, Fritz ; Konečný, Patrik

engleski

A distinct tectono-metamorphic evolution at the southern edge of Tisia Mega-Unit revealed by monazite and xenotime age dating

The Slavonian Mountains (Pannonian Basin, Croatia) are the area of particular significance within Tisia Mega-Unit.This large unit, with complex internal structure, encompasses three huge southward dipping Alpine nappe systems that expose characteristic lithologies of south-eastern part of Pannonian Basin basement. Complexes of the central nappe system (i.e. Bihor) outcrop along the 5.5 km long, NNW–SSE trending Kutjeva+ka Rijeka transect. This transect is one of the most prominent geological cross-sections that reflects a complex history of the metamorphic and igneous evolution, giving insight into crustal evolutionary processes and their relationship to deformation and metamorphism. Our previous age dating of monazite from the representative rock complexes along Kutjevačka Rijeka transect, combined with geothermobarometric data, revealed complex structure and metamorphic history that includes a pre-Variscan (Ordovician to Silurian ; 444±19 and 428±25 Ma)and a Variscan (356±23 Ma) medium-grade metamorphism [1, 2]. The primary focus of this study is on surprisingly large extent of very low- to low-grade Alpine metamorphism recorded in the parametamorphic rocks (chloritoid and chlorite schists) along the transect. The Th–U–Pb age dating on xenotime grains within the chloritoid schist gave an average age of 120±36 Ma, peak metamorphic conditions reaching 3.5–4 kbar and 340–380 °C. The age of 219±81 Ma obtained on Yb-rich xenotime (inherited?) core domain(s), implies a possible existence of older low-grade metamorphic phase(s)[3]. Two distinct penetrative low-grade metamorphic foliations recorded in the chlorite schists are accompanied by existence of two populations of small (~3.5 μm) low-Th monazites, giving an average age 99±15 Ma. Histogram of obtained ages shows two peaks at 120 and 80 Ma while age modelling recognized two peaks at 113±20 and 82±23 Ma. Those ages argue against "stratigraphic doubts" that contradict Alpine metamorphism in the area. [1] Balen et al. (2006) Miner Petrol 87, 143–162. [2] Horváth et al. (2010) Lithos 117, 269–282. [3] Balen et al. (2013) Int J Earth Sci, in press.

crustal evolution; monazite; xenotime; Tisia

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Podaci o prilogu

647-647.

2013.

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objavljeno

Podaci o matičnoj publikaciji

Mineralogical magazine

0026-461X

Podaci o skupu

Goldschmidt 2013

predavanje

25.08.2013-30.08.2013

Firenca, Italija

Povezanost rada

Geologija

Indeksiranost