The granitic rocks in the southern part of the Kyeongsang basin, Korea, are divided into seven masses based on the petrographical features. They are generally characterized by shallow-depth intrusions. The chemical compositions of amphibole and biotite from the granitic rocks show systematic variations in Fe/(Fe+Mg) ratios as well as Mn and F contents. Hornblende geobarometer indicates low pressure condition (less than 2.3 kbar) at the time of final crystallization of hornblende crystals. The composition of biotite indicates that oxygen fugacity has been almost buffered during crystallization regardless of rock types. The oxygen fugacity is presumably close to the value of Ni-NiO buffer. From the Fe-Ti oxide geothermometry, it seems likely that most of the Fe-Ti oxides have been re-equilibrated during cooling and have suffered oxidation under subsolidus condition.

• Jong Ik Lee | 이종익