--> A Sequence Model for the Niigata Back-Arc Sedimentary Basin, Central Japan, by H. Arato, K. Kameo, and K. Hoyanagi; #90986 (1994).

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Abstract: A sequence model for the Niigata back-arc sedimentary basin, central Japan

Hiroyuki Arato, Koji Kameo, Koichi Hoyanagi

In the Niigata basin, as a representative back-arc basin since the middle Miocene age located on central Japan, three-dimensional studies for sequence stratigraphic framework are available, taking an advantage of a large accumulation of subsurface information for petroleum exploration.

As a result of this study, 12 third or fourth order depositional sequences, formed by relative change of sea level, are recognized. Lower sequences are characterized by turbidites deposited on the deep basin floor. They are overlain by middle sequences made up of debris-flow deposits on the basin slope. Remaining upper sequences are composed of deltaic or fluvial deposits. These third or fourth order depositional sequences are superimposed on a tectonically-controlled second order sequence.

Based on this sequence stratigraphic framework, we propose a new depositional model for the Niigata basin. This model is characterized by remarkable progradation and obvious aggradational stacking of downlap surfaces corresponding to fourth order relative sea-level fall and rise, and formation of third order sequence on the basin floor corresponding to deposition of fourth order sequences on the shelf and the basin slope. These features, which are not stated in the "Exxon Model," would be related to rapid subsidence, steep and subdivided geometry, and large sediment influx of the Niigata backarc sedimentary basin. By using this model, furthermore, the depositional history of the Niigata basin can be divided into following 5 stages: (1) sedimentary basin formation, (2) turbidite deposi ion at basin floor, (3) slope progradation, (4) shelf extension, and (5) delta progradation.

AAPG Search and Discovery Article #90986©1994 AAPG Annual Convention, Denver, Colorado, June 12-15, 1994