Slope turbidite packets in a fore-arc basin fill sequence of the Plio-Pleistocene Kakegawa group: their formation and sea-level changes — reply

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Abstract The Plio-Pleistocene Kakegawa Group crops out in western Shizuoka, Japan. It consists of submarine fan and slope to alluvial deposits and forms a third-order sequence. The slope deposits of the upper Kakegawa Group (upper Horinouchi and Hijikata formations) are characterized mainly by alternations of sand and silt (turbidites). Individual sand layers commonly show either small lobe or channel features. In the upper Horinouchi (TST) and middle Hijikata formations (HST), sand turbidite packets (2–15 m) consist of small channel and lobe complexes. The slope sand turbidite packets are different between TST and HST. The differences result from the dissimilar net amplitude of sea-level excursions when fourth- or fifth-order sea-level changes superimposed on a third-order sea-level change with different trend. Other important variables are rate of sediment supply and width of shelf.

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