Microstructures in Two Alkali Feldspar Megacrysts from the Papuk Mt., Croatia
نویسندگان
چکیده
The Papuk Mt. belongs to the Slavonian Mountains in Croatia. It is situated in the southernmost part of the Tisza Megaunit (Fig. 1). Comprehensive reviews of the geological setting of this area are given by JAMIČIĆ & BRKIĆ (1987), JAMIČIĆ (1989) and KOROLIJA & JAMIČIĆ (1989). VRAGOVIĆ (1965) gave a detailed petrographic description of the gneisses, granitoids and the pegmatites of this region. Based on geochemical and isotope data PAMIĆ & LANPHERE (1991) and PAMIĆ et al. (1996) grouped granitoids occurring in the Slavonian Mountains to the Hercynian S-type and I-type group. KUČAN & KRMPOTIĆ (1911) reported the first alkali feldspar megacrysts from the Papuk Mt. (Pakra Creek). They studied the megacrysts under a petrographic microscope and described them as “microclinemicroperthites” in a gneiss host. TAJDER (1957) mentioned “large-sized pink microcline” crystals occurring in pegmatitic pockets (Sloboština Creek) and veins in granitoids (Pakra Creek). VRAGOVIĆ (1965) differentiated megacrysts based on their colours and occurrence Microstructures in Two Alkali Feldspar Megacrysts from the Papuk Mt., Croatia
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Uranium Minerals in the Radlovac Series Metasediments at Mt. Papuk, Croatia
From the early 1960’s to the late 80’s, extensive exploration for uranium ore took place in the former Yugoslavia, including Croatia (BRAUN, 1984). Prospecting activities by the Croatian Geological Survey identified several locations in the Slavonian Mts. (Croatia) with an increased level of radioactivity (BRAUN et al., 1983), particularly in the area of Mts. Psunj and Papuk. The Carbon age of ...
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