The Ibaragi granitic complex in Osaka Prefecture intruded into Paleozoic formation of the Tanba Belt and consists of two separate masses, named Nose pluton and Myoken pluton.
Rock type of the Nose pluton spans from quartz diorite to adamellite. While, the Myoken pluton, intruding into the Nose pluton, consists entirely of adamellite.
Eighty-two specimens were collected from the two masses and were analysed by X-ray flourescence spectrometric and y-ray spectrometric methods on chemical major elements and some trace elements.
The relation of SiO₂ to other chemical elements in whole rock of the Nose pluton is shown in a slightly curved trend. Similar tendency is found on trace elements.
On the other hand, no specific trend is identified between SiO₂ and other elements of the Myoken pluton, due to its narrow SiO₂ spanning. From the trace elements, however, it is divided into two groups.
It could be considered that the Nose pluton was produced through a single differentiation process of parental magma. On the contrary, the Myoken pluton seems to give a suggestion that mixing might have occurred in its parental magma, in spite of its apparent homogeneity observed in the-field.