E-mail: michio_tagiri220130@nifty.com 1:25,000 505 Ma 3.5 1.5 3.5 1.5 115 117 Ma AKS 510 Ma 119 Ma 1
1970 1924 Minato, 1955; 1972 Kuroda, 1959 119 101 Ma K-Ar 1969 1977 1996 AKS Tagiri et al., 2011 Kuroda & Ogura, 1963 Hiroi et al., 1987, 1998 2010 Tagiri et al. 2011 2011 2011 Nozaki et al. 2012 2012 90 Ma SHRIMP 119 Ma Tagiri et al., 2011 2
Tagiri, 1973 Tagiri 1973 SHRIMP 505 Ma SHRIMP 507 Ma Tagiri et al., 2011 Re-Os 533 Ma 2012 1951 Tagiri 1973 Sakashima et al. (2003) 491 Ma 1951 Tagiri et al. 2011 2011 2012 VAG Ti MORB 1992 507 Ma SHRIMP Tagiri et al., 2011 3
; Gusokujima, 1983 Iwao, 1978 1996 2010 2011 500 Ma 1924; Minato, 1955 1979 1972 1996 300 m SHRIMP 510 Ma Tagiri et al., 2011 2011 2012 154 118 Ma 510 Ma 118 Ma 119 101 Ma 119 Ma 115 Ma 2011 2012 4
Tagiri 1973 1996 119 101Ma K-Ar 2008 Al2SiO5 1996 AKS b Hiroi et al., 1998 Gusokujima 1983 (1) (2) 1.5 (3) (4) (5) 5
(6) (7) 1.5 Great Hiatus 10 2010 SHRIMP Wilde et al., 2010 11 Tagiri et al. (2011) 12 1/25,000 13a 505 Ma SHRIMP 13b c 1/25,000 14a Stop 1 6
1/25,000 Stop 3 14b 1/25,000 15a 15b Stop 3 Stop 4 1/25,000 15c NHK 3.11 1/25,000 30 m 3.11 50 m 7
16a 16b 16c SHRIMP 500 Ma 2010 500 Ma 350 Ma 16a 17abc 1/25,000 17a Minato, 1955 Iwao, 1978 1996 1/25,000 3 4 3 2011 Stop 8 3 17b 18a N40 E 90 1 2 m 18b 18a 10 cm 1/25,000 JX 8
17c Stop 9 3 19a b 2010 500 Ma SHRIMP 2012 N10 E 25 E 2 3 m 20 m N30 W 30 E Stop 9 20a 1/25,000 492 m 20b cm 30 cm 9
mm 21 1/25,000 22a 3 10 cm Tagiri, 1973 1/25,000 22b 1/25,000 22c 1/25,000 23a 23b 10
23c 1/25,000 24a 2 m 24b SHRIMP 114.7 Ma 116.5 Ma 1/25,000 15 cm 25a 25b 1/25,000 25c 1 m 1/25,000 26a 510 Ma Tagiri et al., 2011 26b c 26c 11
27a 27b 118.5 Ma SHRIMP 1/25,000 27c 2011 D. Dunkley 106 Nos. 10-11 Glassley, W., 1974, Geochemistry and tectonics of Gressent volcanic rocks, Olympic Peninsula, Washington. Bull. Geol. Soc. Amer., 85, 785 794. Gusokujima, Y., 1983, Microstructures of the folded Hitachi metamorphics in the southern Abukuma Plateau, Japan. Sci. Rep. Inst. Geosci., Univ. Tsukuba, 4, 73-98. 1996 12
Hiroi, Y., Kishi, S., Nohara, T., Sato, K. and Goto, J., 1998, Cretaceous high-temperature rapid loading and unloading in the Abukuma metamorphic terrane, Japan. Jour. Metamorphic Geol., 16, 67-81. Hiroi, Y., Yokose, M., Oba, T., Kishi, S., Nohara, T. and Yao, A., 1987, Discovery of Jurassic radiolaria from acmite-rhodonite-bearing metachert of the Gosaisyo metamorphic rocks in the Abukuma terrane, Northeastern Japan. Jour. Geol. Soc. Japan, 93, 445-448. Iwao, S., 1978, Re-interpretation of the chloritoid-, staurolite- and emery-like rocks in Japan chemical composition, occurrence and genesis. Jour. Geol. Soc. Japan, 84, 49-67. 2011 1977 289-296 1935 1992 Sm-Nd 87 135 1951 57 135-142 Kuroda, Y., 1959, Petrological Study on the Metamorphic Rocks of the Hitachi District, Northeastern Japan. Spec. Rep. Tokyo Kyoiku Daigaku, Sec. C, 7, 1-70. Kuroda, Y. and Ogura,Y., 1963, Epidote-amphibolites from the northeastern Abukuma plateau, Japan. Sci. Rep. Tokyo Kyoiku Daigaku, Sec. C, 8, 245-268. Minato, M., 1955, Japanese Carboniferous and Permian corals. Jour. Fac. Sci., Hokkaido University. Series 4, Geology and Mineralogy, 9, 1-202. Miyashiro, A., 1974, Volcanic rock series in island arcs and active continental margins. Amer. Jour. Sci., 274, 321-355. 2012 Re-Os 2012 SGL43-05 Pearce, J. A., Harris, N. B. W. and Tindle, A. G., 1984, Trace element discrimination diagrams for the tectonic interpretation of granitic rocks. Jour. Petrol., 25, 956-983. Sakashima, T., Terada, K., Takeshita, T. and Sano, Y., 2003, Large-scale displacement along the Median Tectonic Line, Japan: evidence from SHRIMP zircon U-Pb dating of granites and gneisses from the South Kitakami and paleo-ryoke belts. Jour. Asian Earth Sci., 21, 1019-1039. 13
Shimada, M., 1961, Geology and economic geology of the Hitachi Mine. Tohoku Univ., Inst. Mineral., Petrol. Econ. Geol., Dr. Thesis (M.S.). Tagiri, M., 1971, Metamorphic rocks in the Hitachi district in the southern Abukuma Plateau. Japan. Jour. Mineral. Petrol. Econ. Geol., 65, 77-103. Tagiri, M., 1973, Metamorphism of Paleozoic rocks in the Hitachi district, southern Abukuma Plateau, Japan. Sci. Rep. Tohoku Univ., Ser. III, 12, 1, 1-67. 2011 117 1-20 2011 1.5 14 1-14 2008 120-122pp 1979 85 679-689 2012 119 R5-O-4 Tagiri, M., Dunkley, D.J., Adachi, T., Hiroi, Y. and Fanning, C.M., 2011, SHRIMP dating of magmatism in the Hitachi metamorphic terrane, Abukuma belt, Japan: evidence for a Cambrian volcanic arc. Island Arc, 20, 259-279. Daniel J. Dunkley 2010 K-Ar dating Wilde, S.A., Wu, F.Y. and Zao, G., 2010, The Khanka Block, NE China, and its significance for the evolution of the Central Asian Orogenic Belt and continental accretion. Geol. Soc., London, Spec. Pub., 338, 117-137. 14