KECEPATAN PERGERAKAN MAGMA DASIT KE PERMUKAAN DI DAERAH PURWOREJO DAN SEKITARNYA, JAWA TENGAH Berdasarkan Analisis Penarikhan Jejak Belah
Zircon fission track dating using zirkon of four dacite samples from Purworejo, yielded age of 12,6 Â± 1,5 to 15,9 Â± 1,0 m.a. One cooling phase of the dacite body at Purworejo area indicates an uplift velocity of 0.02 - 0.06 mm / year.
Keywords : fission tracks, zircon, uplift, Purworejo
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