Abstract
Abstract Sheet-like turbidite packets and channel-overbank systems are interpreted to be major components of submarine fans. Spatial and temporal relationships between the two major components, however, are not yet clearly understood, in particular for sand-dominated submarine fans in active-margin basins. Three-dimensional outcrop analysis of an ancient sandy submarine fan succession in a Late Miocene–Early Pliocene forearc basin on the Boso Peninsula, Japan, together with mapping of chronostratigraphic markers defined by volcanic ash beds, indicates that deposition of sheet-like turbidite packets was intimately associated with the lateral migration of depocenters of channel-overbank systems and distinct entrenchment of fan channels in response to upfan avulsion. Deposition of a sheet-like turbidite packet is not restricted in a single interchannel low, but rather is spread out over most of the channel-overbank area, possibly reflecting the high width to depth ratio of channel-overbank systems on sandy submarine fans. Largely contemporaneous deposition of sheet-like turbidite packets and channel-overbank systems further indicates that the “basin-floor fan” and “slope fan” of the sequence-stratigraphic model do not necessarily characterize different parts of a relative sea-level lowstand or temporally different types of depositional systems.
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