No abstract

No abstract

No abstract

The forearc basin fill turbidite succession of the Pliocene Anno Formation is well exposed in Boso Peninsula, central Japan. As the turbidite succession of the Anno Formation is distributed along a couplet of anti-and syncline axes trending WNW to ESE, three-dimensional analysis of depositional system of the formation can be carried out by using many tuff beds as key markers. Lateral distribution and successive change of turbidite facies and palaeocurrent directions of turbidites were investigated, based on the detailed lithologic map of the study area.The Occurrence of two successive depositional systems, channel-levee system in the lower part and channel-lobe system in the upper part, forming a submarine fan, is suggested by the facies distributions and palaeocurrent directions. The upward retrogradation can be detected through the formation of the forearc basin fillinig. AbstractCThe Geological Society of Japan 2005 269

No abstract