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doi:10.2204/iodp.proc.346.201.2017

Site location and setting

Site U1426, located at 37°2.00′N, 134°48.00′E; 903 mbsl, is near the top of the Oki Ridge, in the south central part of the marginal basin (Fig. F1). The second branch of the Tsushima Warm Current flows over this site. Physical properties of the water column enable four types of water masses to be characterized in the marginal sea (Ozawa, 2003): the Tsushima Warm Current Surface Water (water depth < 70 m), Tsushima Warm Current Core Water (water depth = 70–150 m), Japan Sea Intermediate-Proper Water (water depth > 170 m), and Japan Sea Central Water (water depth = 30–180 m in northern part of the marginal sea).

Of the four holes cored at Site U1426, Holes U1426A and U1426C were examined in the present study. Total core recoveries for Holes U1426A and U1426C were 418.78 m (105.6%) and 211.9 m (103.9%), respectively.

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