トクシマケン イズミ ソウグンチュウ ノ ショウジョウ デュープレックス ト シンチョウ デュープレックス
Thrust and Extensional Duplexes of the Izumi Group, Tokushima Prefecture
Murata, Akihiro Institute of Socio-Arts and Sciences, University of Tokushima Tokushima University Educator and Researcher Directory KAKEN Search Researchers
Fukuda, Kayo Mitsui Oil Exploration Co., Ltd.
Departmental Bulletin Paper
Thrust duplexes and extensional duplex of outcrop-scale were studied in the Cretaceous Izumi Group in the Naruto Area, Tokushima Prefecture. At least four thrust duplexes occur in the alternating beds of sandstone and mudstone of the Izumi Group to the east of Nakayama. These duplexes are
fundamentally hinterland-dipping duplex and possibly antiformal stack in part. They considered to have been formed by nearly horizontal roof and floor thrusts, and to have rotated forward about 50°- 60° with surrounding strata. Extensional duplex occurs also in the alternating beds of sandstone and mudstone to the south of Nakayama. At least 10 normal faults displaced sandstone bed, and a conjugate fault set is detected in the duplex. The extensional duplex is probably considered to have been formed by nearly horizontal roof and floor faults.
徳島大学総合科学部自然科学研究 = Natural Science Research, The University of Tokushima
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