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1 1.5 Outcrops of the Unconformity between the Cambrian and Carboniferous Formations with 150 My Gap in the Hitachi Paleozoic Terrane Michio TAGIRI and Wataru KOIKE Reprinted from Bulletin of Ibaraki Nature Museum No.14 November, 2011

2 Bull. Ibaraki Nat. Mus., 14 : 1-13, pls Outcrops of the Unconformity between the Cambrian and Carboniferous Formations with 150 My Gap in the Hitachi Paleozoic Terrane Michio TAGIRI and Wataru KOIKE Accepted November 13, 2011 Abstract The unconformity between the Cambrian Akazawa Formation and the Carboniferous Daioin Formation is traced from the northeast to the southwest in the Hitachi Paleozoic Terrane. We newly describe the geological features of the unconformity in four outcrops. Basal conglomerates occur above the unconformity in the northeastern part, but not in the southwestern part. In the latter part, blocks of volcanic rock of the Akazawa Formation and pebbles of meta-granitoids are intercalated in the Daioin Formation. Key words: Hitachi Paleozoic Terrane, Cambrian, Carboniferous, unconformity, basal conglomerate, Great Hiatus. 2010; Tagiri et al., Sakashima et al., A 1B SHRIMP 500 Ma Tagiri et al., C Tagiri, * Hitachi City Museum, Miyata-cho, Hitachi, Ibaraki , Japan. ** Ibaraki Nature Museum, 700 Osaki, Bando, Ibaraki , Japan.

3 2 1 4 : N40 W 55 E 2 3 m 20 m N50 W 30 N : 3A N40 E m 3B : 3C N40 E 70 E N35 E 90 Fig. 1. Geological map of the Hitachi Paleozoic Terrane and geologic ages. Fig. 2. Stratigraphical divisions of the Hitachi Paleozoic Terrane.

4 1.5 3 : : : : Fig. 3. Localities of four unconformity outcrops. 1: Daioin, 2: Fudodaki Fall of the Miyata River, 3: Takidaira, 4: Upper reaches of the Ayu River. 3D : 4A EW 90 4B : N30 E 30 E N50 E 35 S 1 Fig. 4. Lithofacies distribution near the unconformity outcrop between the Cambrian Akazawa Formation and the Carboniferous Daioin Formation in Daioin. 500 Ma 2010; Tagiri et al., ; Minato, Ma 1 5 Great Hiatus, 1979; Kim,

5 4 Ehiro, 2001; Ishiwatari and Tsujimori, 2003;, 2004;, 2010; Isozaki et al., Tagiri et al. 2010, SHRIMP D.J. Dunkley 2010 Ehiro, M Origins and drift histories of some microcontinents distributed in the eastern margin of Asian Continent. Earth Sci. Chikyu Kagaku, : : Ishiwatari, A. and T. Tsujimori Paleozoic ophiolites and blue schists in Japan and Russian Primorye in the tectonic framework of East Asia: A synthesis. Island Arc, : Isozaki, Y., K. Aoki, T. Nakamura and S. Yanai New insight into a subduction-related orogen: A reappraisal of the geotectonic framework and evolution of the Japanese Islands. Gondwana Res., : Kim, O.J Tectonic Evolution. In: Lee, D.S. ed., Geology of Korea, Chapter 11, pp , Geological Society of Korea, Kyohaku-Sa, Seoul Ma : pp ,. Minato, M Japanese Carboniferous and Permian corals. J. Fac. Sci., Hokkaido Univ. Series 4, Geology and Mineralogy, : Sakashima, T., K. Terada, T. Takeshita and Y. Sano 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. J. Asian Earth Sci., : Tagiri, M Metamorphism of Paleozoic rocks in the Hitachi district, southern Abukuma Plateau, Japan. Sci. Rep. Tohoku University, 1 : D.J. Dunkley 2010 SHRIMP : Tagiri, M., D.J. Dunkley, T. Adachi and Y. Hiroi Great hiatus in the Cambrian Hitachi metamorphic terrane comparable to the North China Craton. 117 O-60 p. 65 Tagiri, M., D.J. Dunkley, T. Adachi, Y. Hiroi and C.M. Fanning SHRIMP dating of magmatism in the Hitachi metamorphic terrane, Abukuma belt, Japan: Evidence for a Cambrian island arc. Island Arc, : : :

6 4 Plates and Explanations 4 plates

7 A: B: C: Outcrop of the unconformity at the upper stream of Fudodaki Fall, Torentsu river. A: Meta-conglomerate and metagranite contact with the boundary of the unconformity, B: Boulder of meta-granite in the meta-conglomerate, C: Biotite schist matrix in the meta-conglomerate.

8

9 Outcrop of the unconformity at a steep slope of the hillside in Daioin Outcrop 1.

10

11 A: B: C: D: Outcrops of the unconformity at Fudodaki Fall of the Miyata River Outcrop 2 and Takidaira Outcrop 3. A: the boundary of the unconformity at the side of Fudodaki Fall Outcrop 2, B: Granitic pebbles included in phyllite in Outcrop 2, C: the boundary of the unconformity at the road-side of Takidaira Outcrop 3, D: Granules included in phyllite in Outcrop 3.

12

13 A: B: Outcrop of the unconformity at the upper reaches of the Ayu River Outcrop 4. A: Loosely curved boundary of the unconformity between amphibolite Akazawa F. and phyllite Oaioin F., B: An amphibolite block embedded in phyllite.

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