徳島県，和泉層群中の衝上デュープレックスと伸張デュープレックス

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  • Thrust and Extensional Duplexes of the Izumi Group, Tokushima Prefecture
  • 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

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Abstract

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.

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