Geochemical Correlation Between Mafic and Felsic Igneous Rock from Godean, Yogyakarta, Indonesia

Godean is a as a part of Miocene Southern Mountain magmatisme range that occur in Yogyakarta, Indonesia. Godean is a hilly morphology that compose from several type of igneous rock occurs that are andesite and microdiorite intrusion, dacite subvolcanics to lava, and the latest is basalt subvolcanic. That's rock indicated there is completes differentiation of igneous rock in Godean, that's occurs as felsic rock to mafic rock that must have a correlation in between. This research was conduct from field geological mapping, petrographic analysis, and complete geochemistry. Geochemical correlation analysis was done using qualitative method and quantitative method. Both of the rock was origin from same magma source at normal differentiation of island arc magma, and from CIPW-normative mineralogy show decreasing of mafic and opaque mineral, and increasing of felsic mineral. Simple statistics method shows high positive correlation in major element and REE but low in trace element. Analysis with isocon method resulting Al 2 O 3 , Eu, Gd, and Sm as immobile element, and resulting that geochemical increasing at K 2 O, SiO 2 , NaO, Pb, Rb, La, Ce, Pr, while the other element was decreasing. Geochemical correlation between basalt and dacite, shows correlation from chemical data and genetic interpretation. This research perhaps can used to another type of igneous rock analysis, to interpretation the geological phenomena.