Major and trace elements analysis, U-Pb zircon dating, rare earth elements (REE) analysis and SrNd isotope analysis were conducted on samples from the Haki Granodiorite in the eastern part of northern Kyushu, Southwest Japan. This granodiorite is composed mainly of porphyritic medium-grained hornblende - biotite granodiorite, and divided into two facies: main facies and hornblende porphyritic facies. U-Pb zircon age of 106.64 ± 0.82 Ma is obtained from the main facies of this granodiorite. This age similar to that of the Ochiai Granodiorite. Major and trace elements, REE and Sr-Nd isotopic compositions of this granodiorite also similar to those of the Ochiai Granodiorite. Thus, the source magma of the Haki Granodiorite is the same as that of the Ochiai Granodiorite.
We carried out geological and radiolarian studies in the northern part of the Nishinoomote Formation of the Kumage Group in the South Shimanto Belt, Tanegashima Island. The Nishinoomote Formation in the study area consists mainly of thick bedded sandstone and alternating beds of sandstone and shale with minor amount of varicolored shale. As a result of the radiolarian study, Late Eocene radiolarians such as Lithocyclia ocellus group and Lychnocanium neptunei were obtained from two samples of black shales, and Late Eocene radiolarians such as Lychnocanoma babylonis and Shiphocampe missilis were recognized in one sample of varicolored shale. In the previous study, Early Oligocene radiolarian fossils and calcareous nannofossils had been reported from the northernmost part of the Nishinoomote Formation. Therefore, considering the difference of depositional age and lithology, further study is needed to clarify the relationship between the northernmost part and the northern part of the Nishinoomote Formation.