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Core samples have been analyzed from three holes off southeastern Japan (Figure 1). Five samples are from Hole 297 on the western edge of the Shikoku Basin immediately south of the Nankai Trough. Sixteen samples are from Holes 298 and 298A located on the inner slope of the Nankai Trough. The samples were analyzed to determine the organic content and to determine carbonization levels by elemental analysis, visual carbonization estimates, and palynomorph translucency measurements. The primary interest was in estimating the thermal history of the sediments. The preliminary cruise report describes the stratigraphic section at Site 298 (Nankai Trough) as a turbidite sequence of early Pleistocene to Holocene age in which compaction, cleavage, and mesoscopic folding increase downward. The cleavage patterns suggest that the sediments have been deformed into a recumbent fold, presumably as a result of shearing along a subduction zone. Therefore, it is of interest to know whether the sediments had been buried more deeply prior to deformation, or whether they represent a "thinskinned" fold.

Diagenesis of Organic Matter and Estimated Temperature History from Carbonization Measurements, Shikoku Basin