Supplementary data on the geology and petrology of the Middle Miocene Takano Formation (Ishizuchi Group) along the Namekawa Gorge, Toon, Ehime, SW Japan

Supplementary information. Methods of analyses (in Japanese), literature cited in the data files, and figure and table captions for the data files.

Fig. S1. Photographs of outcrops in the study area. A detailed caption of this figure can be found in the supplementary information. 

Fig. S2. (a–h) Polished surfaces of rock samples of the (a–c) lower, (d) transitional, and (e–f) upper parts of the Takano Formation and (g–h) the Kuromoritoge Formation. (i–x) Photomicrographs of the (i–j) lower, (k–o) transitional, and (p–w) upper parts of the Takano Formation and (x) the Kuromoritoge Formation taken under plane-polarized light (left) and cross-polarized light (right). A detailed caption of this figure can be found in the supplementary information.

Fig. S3. Bulk-rock chemical composition showing major and trace elements for samples of the Ishizuchi Group. A/CNK = Al₂O₃/(CaO + Na₂O + K₂O) in molar ratio, and Mg# = Mg/(Mg + Fe) × 100 in molar ratio. See Figs. 2 and 3 for sample names and locations, and Figs. 7 and S4 for an explanation of symbols. Analytical data are provided in Table S1.

Fig. S4. Harker diagrams of major and trace elements for samples of the Ishizuchi Group and other igneous and volcaniclastic rocks of the Outer Zone felsic rocks (OZFR) and Setouchi volcanic rocks (SVR). A detailed caption of this figure can be found in the supplementary information.

Fig. S5. (a) Compositional profiles of garnets from the Takano Formation. (b) Dendrogram based on the bulk-rock chemical compositions of the Takano and Kuromoritoge formations. (c) Th/U ratio versus U content of zircons, from which concordant data were obtained, including measurements from zircons collected from the Myojin, Takano, and Kuromoritoge formations. A detailed caption of this figure can be found in the supplementary information.

Fig. S6. Backscattered electron (left) and cathodoluminescence (right) images of zircon grains, from which concordant data were obtained, including measurements from zircons collected from the Myojin, Takano, and Kuromoritoge formations. A detailed caption of this figure can be found in the supplementary information.

Table S1. Bulk-rock chemical compositions of samples collected from the Takano and Kuromoritoge formations and Sambagawa metamorphic rocks, analyzed by wavelength dispersive X-ray fluorescence spectrometer (WD-XRF) and inductively coupled plasma–mass spectrometry (ICP–MS). A detailed caption of this figure can be found in the supplementary information.

Table S2. Chemical compositions of garnets from the Takano Formation analyzed by scanning electron microscope and energy dispersive X-ray spectroscopy, showing calculated atoms per formula unit for each element and garnet end-member compositions. A detailed caption of this figure can be found in the supplementary information.

Table S3. U and Th concentrations, U/Th ratios, fractions of common ²⁰⁶Pb in percent (%f²⁰⁷) calculated from measured and common ²⁰⁷Pb/²⁰⁶Pb, U–Pb isotopic ratios (²⁰⁸Pb corrected), and calculated ages (²⁰⁷Pb corrected) of zircons from which concordant data were obtained. A detailed caption of this figure can be found in the supplementary information.