Zircon Reveals Diverse Trends of Magma Crystallization from Two Types of Early Post-Collisional Diorites (Variscan Orogen, NE Bohemian Massif)
- Pietranik, Anna
- Farina, Federico
- Derkowska, Katarzyna
- Schaltegger, Urs
- Przybyło, Arkadiusz
- Storey, Craig
- Lasalle, Stéphanie
- Dhuime, Bruno
- Panczyk, Magdalena
- Zielinski, Grzegorz
- Nowak, Małgorzata
- Bulcewicz, Kamil
- Kierczak, Jakub
DOIAbstract
International audienceAmphibole- and clinopyroxene-bearing monzodiorites were emplaced at 340 Ma (CA-ID-TIMS zircon age), suggesting the formation of hydrous and dry magmas closely related in space and time in the NE Bohemian Massif. Hafnium and oxygen isotopes of zircon in less evolved rocks (<55 wt% SiO2) are similar between Amp and Cpx monzodiorites (εHf = −3.3 ± 0.5 and − 3.5 ± 0.8; δ18O = 6.4 ± 1.0 and 6.8 ± 0.7, respectively), consistent with a common source—a contaminated mafic magma derived from an enriched mantle. At the same time, the conditions of crystallization are distinct and zircon appears to be an excellent tool for distinguishing between hydrous and anhydrous crystallization conditions, a process that may be more ambiguous...
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