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This study examines the lithostratigraphy and age of the chertdominated succession in the eastern section of the Funabuseyama rock mass within the Mino Belt. The chert-dominated succession (~550 m thick) comprises (in ascending order) basaltic rocks, reddish chert, clastic dolomite, gray-to-black chert, black claystone, darkgray-to-black chert, and alternating layers of siliceous micrite and chert. Radiolarian biostratigraphy indicates that the reddish chert, gray-to-black chert, and dark-gray-to-black chert are correlated with the middle to upper Cisuralian, lower Guadalupian to upper Lopingian, and upper Lower to upper Middle Triassic, respectively. The age of the alternating siliceous micrite and chert falls within the beginning to middle Late Triassic. The entirety of the chert-dominant succession ranges in age from the middle Cisuralian to the middle Upper Triassic. The lithostratigraphy and complete lack of coarse terrigenous grains and rocks within the chert-dominant succession indicate a formation through pelagic, deep-marine sedimentation on the lower flank of an ocean-floor basaltic seamount in an open-ocean realm. The clastic dolomite is interpreted to represent sediments displaced from a shallow-marine setting into a deep-marine setting where the chert accumulated. Lithostratigraphy and biostratigraphy show that the middle Cisuralian to upper Lower Triassic section of the chert-dominant succession is correlated with the previously defined Hashikadani Formation and part ial ly emends the western sect ion of the Funabuseyama rock mass. By adding the middle Triassic chert and upper Triassic alternating siliceous micrite and chert to the middle Cisuralian to upper Lower Triassic chert-dominated succession, we propose that a revision to the Hashikadani Formation is required. Accordingly, the Hashikadani Formation should be interpreted as a sedimentary unit recording a long-lived deep-marine and pelagic sedimentation from the middle Cisuralian to middle Late Triassic upon a basaltic basement in an open-ocean realm.

chishitsugaku zasshi

Erratum : Stratigraphy and age of the Permian to Triassic chert-dominant succession of the Mino Belt in the eastern part of the Funabuseyama rock mass, western Gifu Prefecture