2011 Volume 70 Issue 1 Pages 25-30
Bed-by-bed correlation of sheet-like turbidite sandstone beds reveals variations in stacking patterns of beds and bed-sets in a 20-45 m-thick sheet-like turbidite package within the Miocene-Pliocene submarine-fan succession of the Kiyosumi Formation, Boso Peninsula, central Japan. Migration distance of the thickness-weighted depocenter (TWD) of each sheet-like turbidite sandstone bed relative to its underlying bed show increase-and-decrease cycles. This is interpreted to document the repetition of infilling and flattening out of topographic lows, and the development of younger lows as a result of stacking of sheet-like turbidite sandstone beds with convex-up geometry in a submarine-fan system. Furthermore, the sequential changes of bed stacking permit subdivision of the studied package into five bed-sets. The bed-set stacking shows migration distance of TWD smaller than those of component beds and represents less variable distribution in the stacking processes.
