TY - JOUR
T1 - Accretionary process of the Tertiary Setogawa and Mikasa Groups, southwest Japan.
AU - Osozawa, Soichi
PY - 1988/1/1
Y1 - 1988/1/1
N2 - The Middle Eocene to Lower Miocene Setogawa Group consists of pelagic, hemipelagic, and terrigenous sediments with volcanic intercalations. The sediments were deposited in and below the lower bathyal zone. The Setogawa Group is a wedge-shaped volcano-sedimentary pile, deformed by reverse faults and asymmetric folds at the landward edge, and constitutes a subduction complex. The reverse faulting and asymmetric folding took place abruptly, accompanied by tilting, uplifting, and gravity sliding of strata, and dewatering and consolidation of sediments. This was followed by the Lower Miocene Mikasa group, which consists of (in ascending order) debris flow deposits, terrigenous, and volcano-terrigenous sediments. The basal debris-flow deposits were mostly derived from the upper part of the Setogawa Group. They buried the structural depressions formed by the reverse faulting and asymmetric folding and eroded the underlying strata over the short timespan included in the Stichocorys delmontensis Zone. The Mikasa Group sediments were deposited in the middle bathyal zone. They were involved in normal faulting and open-to-gentle folding.-Author
AB - The Middle Eocene to Lower Miocene Setogawa Group consists of pelagic, hemipelagic, and terrigenous sediments with volcanic intercalations. The sediments were deposited in and below the lower bathyal zone. The Setogawa Group is a wedge-shaped volcano-sedimentary pile, deformed by reverse faults and asymmetric folds at the landward edge, and constitutes a subduction complex. The reverse faulting and asymmetric folding took place abruptly, accompanied by tilting, uplifting, and gravity sliding of strata, and dewatering and consolidation of sediments. This was followed by the Lower Miocene Mikasa group, which consists of (in ascending order) debris flow deposits, terrigenous, and volcano-terrigenous sediments. The basal debris-flow deposits were mostly derived from the upper part of the Setogawa Group. They buried the structural depressions formed by the reverse faulting and asymmetric folding and eroded the underlying strata over the short timespan included in the Stichocorys delmontensis Zone. The Mikasa Group sediments were deposited in the middle bathyal zone. They were involved in normal faulting and open-to-gentle folding.-Author
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U2 - 10.1086/629209
DO - 10.1086/629209
M3 - Article
AN - SCOPUS:0023723522
VL - 96
SP - 199
EP - 208
JO - Journal of Geology
JF - Journal of Geology
SN - 0022-1376
IS - 2
ER -