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1 Jour. Geol. Soc. Japan, Vol., Supplement, p., September The oldest formations in Japan Metamorphosed Cambrian System in Hitachi, Ibaraki Prefecture Michio Tagiri 1, Yoshikuni Hiroi 2 and Tatsuro Adachi 3 A Hitachi City Museum, Hitachi -, Japan. Department of Earth Sciences, Chiba University, Chiba -, Japan Graduate School of Social and Cultural Studies, Kyushu University, Fukuoka -, Japan Corresponding author: M. Tagiri SHRIMP km A Cambrian, Hitachi metamorphosed Paleozoic formations, unconformity, sedimentary structure, basal conglomerate, volcanic texture, Paleozoic fossils, : : : : : Stop N, E Ma Stop N, E Stop N, E Stop N, E Stop N, E Stop N, E.. Stop N, E Stop N, E Stop N, E.. Stop N, E Stop N, E Stop N, E Stop N, E Stop N, E Stop N, E Stop N, E Stop N, E AKS Stop N, E Ma Stop, E The Geological Society of Japan

2 Fig. ; Minato, ; Kuroda, Fig. Tagiri et al. Ma K-Ar AKS Fig. ; Tagiri et al., Kuroda & Ogura, Hiroi et al., Fig. Tagiri et al. Fig. Fig. Table Tagiri et al., Tagiri Tagiri et al., Ma SHRIMP Ma Tagiri et al., Fig. m SHRIMP Ma Tagiri et al., Fig. 1 Historical review of the stratigraphic research on the Hitachi metamorphosed Paleozoic formations (Tagiri et al., ).

3 Fig. 2 Geological division of the Abukuma Mountains (Tagiri et al., ). T.L.: Tectonic Line. Ma SHRIMP Tagiri et al., Tagiri, Tagiri SHRIMP Ma SHRIMP Ma Tagiri et al., Tagiri et al., Tagiri Sakashima et al. ( ) Ma Tagiri et al. Fig. : VAG Ti MORB

4 Fig. 3 Geological map of the Hitachi Paleozoic formations in the Taga Mountains (Tagiri and Koike, ). The numbers indicate the outcrops of unconformity. Fig. 4 Geological cross sections of the Taga Mountains (Tagiri et al., ). The legend is the same as Fig.. The symbol of strike-dip indicates the direction and angle of inclination.

5 Table 1 SHRIMP ages with mineral assemblage of the Hitachi Cambrian formations in the Taga Mountains (Tagiri et al., ; Sakashima et al., ). Mineral abbreviations follow Editorial committee of the Geological Society of Japan ( ). SHRIMP Tagiri, et al., ; Sakashima et al., Fig. ; Gusokujima, Iwao, ;, ; ; Minato, Tagiri Ma; ; K-Ar Fig. Fig. A B C Al SiO AKS Fig. b Hiroi et al., Gusokujima Fig..

Fig. 5 (a) Geological map of Nishidohira metamorphics, showing the sample localities of the specimens petrographed in detail and analyzed with an EPMA (underlined samples are AKS gneisses) (Hiroi

6 Fig. 5 (a) Geological map of Nishidohira metamorphics, showing the sample localities of the specimens petrographed in detail and analyzed with an EPMA (underlined samples are AKS gneisses) (Hiroi and Kobayashi, ). (b) Metamorphic PT-path of the Nishidohira metamorphics (Hiroi and Kobayashi, ). GASP: garnet-aluminosilicate-silica-plagioclase geobarometer. a EPMA AKS b Fig.. Great Hiatus Fig.

7 Fig. 6 Chemical characteristics of meta-granitoids and meta-rhyolites (a~d) and Hitachi meta-volcanics (e~f) (Tagiri et al., ). (a) K O- SiO diagram (b) SiO -FeO*/MgO diagram (Miyashiro, ) (c) Rb-Y+Nb diagram (Pearce et al., ) (d) Rb-Y diagram (Pearce et al., ), (e) SiO -FeO*/MgO diagram (Miyashiro, ) (f) TiO -FeO*/MgO diagram (Glassley, ). Chemical compositions of Hitachi meta-volcanics are quoted from Tagiri ( ) and Tagiri and Okura ( ). CAB: calc-alkali basalt, MORB: mid-oceanic ridge basalt, ORG: ocean-ridge granite, Syn-COLG: syn-collisional granite, VAG: volcanic-arc granite, WPG: within-plate granite. a d e f a K O- SiO b SiO -FeO*/MgO Miyashiro, c Rb-Y+Nb Pearce et al., d Rb-Y Pearce et al., e SiO -FeO*/MgO Miyashiro, f TiO -FeO*/MgO Glassley, Tagiri

8 SHRIMP Wilde et al., Fig. Tagiri et al. Fig. 7 Mineral assemblages of Hitachi metamorphic rocks (revised after Tagiri ( )). Tagiri Fig. /, Fig. a Fig. 8 Metamorphic zonation of the Hitachi metamorphic district (modified after Tagiri and Hiroi ( )). The boundary among the Hitachi Paleozoic formations is drawn with fine line.

river-floor. The arrows indicate the direction of the lineation. /, Stop Fig. b Fig.

9 Ma SHRIMP Fig. b c /, Fig. a Stop Fig. 9 Multiple lineation structure of the north body of metagranitoids in the Torentsu-gawa river-floor. The arrows indicate the direction of the lineation. /, Stop Fig. b Fig. 10 Stratigraphic correlation among North China area, the northern part of the Korean Peninsula and Eastern Japanese Islands (Tagiri et al., ). Tagiri et al.,

10 /, Fig. a Fig. b /, Fig. c NHK Fig. 11 Tectonic relation of the present Japanese Islands with East Asian continental blocks (Tagiri et al., ). The arrangement of continental blocks is mainly based on Wilde et al. ( ). Wilde et al. /, m m Fig. a Fig. 12 The location map of the stop-points along the Torentsu-gawa river route.

a Stop b Stop Fig. b Fig. c SHRIMP Ma Ma Fig. a Fig.

11 Fig. 14 (a) Cambrian porphyry dyke intruding into greenschist of the Akazawa Formation at Stop, (b) greenschist of the Akazawa Formation at Stop. a Stop b Stop Fig. b Fig. c SHRIMP Ma Ma Fig. a Fig. 13 (a) Outcrop at Stop, (b) and (c) thin section photographs of Cambrian meta-porphyry at Stop. a Stop b c Stop Fig. abc /, Fig. a, ; Minato, mm

15 (a) Metamorphosed pillow lava of the Akazawa Formation at Stop.

12 Fig. 16 (a) Stop, the unconformity outcrop between metagranitoids and meta-conglomerates at the base of the Daioin Formation, (b) boulders in meta-conglomerate, (c) pebbles in the mica-schist of the matrix of meta-conglomerate (Tagiri and Koike, ). a Stop b c Iwao, ; Fig. 15 (a) Metamorphosed pillow lava of the Akazawa Formation at Stop. The white line indicates one pillow, (b) metamorphosed pillow lava on the river-floor at Stop, (c) metamorphosed Cambrian granitoids of the Fudotaki Fall, Torentsu-gawa river at Stop. a Stop b c Stop cm /, Fig. Fig. Stop Fig. Fig. b Fig. a N E m Fig. b Fig. a

18 (a) Stop, the unconformity outcrop between the Akazawa and Daioin formations at the Fudotaki

13 Fig. 17 (a) The location map of Stop, (b) Stop, and (c) Stop along the Miyata-gawa river route. a Stop b Stop c Stop Fig. 18 (a) Stop, the unconformity outcrop between the Akazawa and Daioin formations at the Fudotaki Fall on the Miyata-gawa river, (b) the enlarged photo of the rectangular part of Fig. a (Tagiri and Koike, ). a Stop b a cm /, JX Fig. c Stop Fig. Fig. a b N E E m m

(b) Stop, the unconformity outcrop between meta-granitoids and meta-conglomerates at the base of the

14 N W E Fig. a /, m Fig. b cm cm mm Table Fig. 19 (a) the / scale route map at Stop (drawn based on the Zenrin Data Com). (b) Stop, the unconformity outcrop between meta-granitoids and meta-conglomerates at the base of the Daioin Formation (Tagiri and Koike, ). a Stop / b Stop Fig. 20 (a) The location map of Stop along the Mt. Oiwa-san route, (b) typical occurrence of meta-rhyolites at Stop near the Iwa-goya. a Stop b Stop

15 Table 2 Average chemical composition of white mica-schists of Oiwa-san rhyolites (Kuroda, ). Kuroda, Fig. /, Fig. a Fig. Fig. gabbroic rocks cm Tagiri, /, Fig. b /, Fig. c /, Fig. 21 The location map of the stop-points along the Nishidohira route. Fig. a Fig. b Fig. c /, SHRIMP Ma

23 (a) Stop, Graded bedding of meta-sandstone, the arrow indicates viewpoint, (b) load

16 Fig. 22 (a) Cortlandite at Stop, (b) mica gneisses at Stop, (c) mica gneisses and granitic sand-dyke at Stop. a Stop b Stop c Stop /, cm Fig. a Fig. 23 (a) Stop, Graded bedding of meta-sandstone, the arrow indicates viewpoint, (b) load cast on the bottom of a meta-sandstone base, and (c) sand-dyke intruding into meta-sandstones at Stop. a b c Stop. Fig. b

17 Fig. 24 (a) Meta-conglomerate at Stop, (b) close-up view of (a). a Stop b a /, Fig. c m Fig. /, Fig. a Ma Tagiri et al., Fig. 25 (a) Overturned bedding of meta-sandstones at Stop, (b) close-up view of (a), graded bedding of a overturned medium-grained sandstone bed, (c) the scenery of the AKS gneiss at Stop. a Stop b a c Stop AKS Fig. b c Fig. c

(a), (c) close-up view of cross-bedding and graded bedding of the rectangular part of (b). a Stop b a c b Fig.

18 Fig. a Fig. b /, Fig. 26 (a) The alternation of felsic schists and mica schists at Stop, (b) close-up view of the rectangular part of (a), (c) close-up view of cross-bedding and graded bedding of the rectangular part of (b). a Stop b a c b Fig. 27 (a) Load cast of the top plane of a felsic schist bed near Stop, and (b) ripple mark of the top plane of a felsic schist bed on the road side near Stop, (c) serpentinites at Stop. a Stop b Stop c Stop

19 Fig. c D. Dunkley JX Editorial committee of Geological Society of Japan Jour. Geol. Soc. Japan Nos. - (Fujimoto, H.) Jour. Geogr. - Glassley, W.,, Geochemistry and tectonics of Gressent volcanic rocks, Olympic Peninsula, Washington. Bull. Geol. Soc. Amer.,,. Gusokujima, Y.,, Microstructures of the folded Hitachi metamorphics in the southern Abukuma Plateau, Japan. Sci. Rep. Inst. Geosci., Univ. Tsukuba,, -. (Hagiya, H.) Abstr. rd Ann. Meet. Geol. Soc. Japan (Hiroi Y. and Kobayashi, E.), Jour. Mineral. Petrol. Econ. Geol. - Hiroi, Y., Kishi, S., Nohara, T., Sato, K. and Goto, J.,, Cretaceous high-temperature rapid loading and unloading in the Abukuma metamorphic terrane, Japan. Jour. Metamorphic Geol., -. Hiroi, Y., Yokose, M., Oba, T., Kishi, S., Nohara, T. and Yao, A.,, Discovery of Jurassic radiolaria from acmite-rhodonite-bearing metachert of the Gosaisyo metamorphic rocks in the Abukuma terrane, Northeastern Japan. Jour. Geol. Soc. Japan,, -. Iwao, S.,, Re-interpretation of the chloritoid-, staurolite- and emerylike rocks in Japan chemical composition, occurrence and genesis. Jour. Geol. Soc. Japan,, -. (Kano, H., Kuroda, Y., Uruno, K., Nureki, K., Hara, I., Kanisawa, S., Maruyama, T. and Umemura, H.) The Sambagawa Belt - Hiroshima Univ. Press (Kinoshita, K.) Geological map of Japan, Scale :, Sukegawa, and its explanatory text Geol. Surv. Japan p. (Kobayashi, E., Kagami, H. and Hiroi, Y.) Sm-Nd Abstract in Assoc. Mineral. Petrol. Econ. Geol.,. (Kuroda, Y.) Jour. Geol. Soc. Japan -. Kuroda, Y.,, Petrological Study on the Metamorphic Rocks of the Hitachi District, Northeastern Japan. Spec. Rep. Tokyo Kyoiku Daigaku, Sec. C,, -. Kuroda, Y. and Ogura, Y.,, Epidote-amphibolites from the northeastern Abukuma plateau, Japan. Sci. Rep. Tokyo Kyoiku Daigaku, Sec. C,, -. Minato, M.,, Japanese Carboniferous and Permian corals. Jour. Fac. Sci., Hokkaido University. Series, Geology and Mineralogy,, -. Miyashiro, A.,, Volcanic rock series in island arcs and active continental margins. Amer. Jour. Sci., -. Pearce, J. A., Harris, N. B. W. and Tindle, A. G.,, Trace element discrimination diagrams for the tectonic interpretation of granitic rocks. Jour. Petrol.,, -. Sakashima, T., Terada, K., Takeshita, T. and Sano, Y.,, 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.,, -. Shimada, M.,, Geology and economic geology of the Hitachi Mine. Tohoku Univ., Inst. Mineral., Petrol. Econ. Geol., Dr. Thesis (M.S.). (Sugiyama, S.). Earth Sci. -. Tagiri, M.,, Metamorphic rocks in the Hitachi district in the southern Abukuma Plateau. Japan. Jour. Mineral. Petrol. Econ. Geol.,, -. Tagiri, M.,, Metamorphism of Paleozoic rocks in the Hitachi district, southern Abukuma Plateau, Japan. Sci. Rep. Tohoku Univ., Ser. III,,, -. Tagiri, M. and Koike, W.. Bull. Ibaraki Nature Museum Tagiri, M. and Hiroi, Y. Abukuma Mountains and Hitachi district, Regional Geology of Japan, Kanto Region Asakura Press - pp. Tagiri, M. and Okura, C.). Jour. Geol. Soc. Japan - Tagiri, M., Dunkley, D.J., Adachi, T., Hiroi, Y. and Fanning, C.M.,, SHRIMP dating of magmatism in the Hitachi metamorphic terrane, Abukuma belt, Japan: evidence for a Cambrian volcanic arc. Island Arc,, -. Daniel J. Dunkley Tagiri, M., Morimoto, M., Mochizuki, R., Yokosuka, A., Dunkley, D.J. and Adachi, T.) SHRIMP Jour. Geogr. - Ueda, Y., Yamaoka, K., Onuki, H. and Tagiri, M.) K-Ar dating (II) Japan. Jour. Petrol. Mineral. Econ. Geol. - (Watanabe, M.) Jour. Geol. Soc. Japan - Wilde, S.A., Wu, F.Y. and Zao, G.,, The Khanka Block, NE China,

20 and its significance for the evolution of the Central Asian Orogenic Belt and continental accretion. Geol. Soc., London, Spec. Pub.,, -.

Microsoft Word - 研究者向け案内書.docx

Microsoft Word - 研究者向け案内書.docx 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