Abstract
Several long piston and gravity cores of the Japan Sea sediment are recovered during the cruise of the R/V Marione Dufresne in 2010 (MD179). Fundamental core description is presented here to share common information of the collected sediments that will be served for various analytical studies. In addition to the description on-board, detailed observation is performed by the images of the multi-scanner and the X-ray CT scanner.
The recovered sediments are mainly consists of alternated dark- and light-colored silty mud with intercalations of tephras and sand laminations in some cores. Dark layers are commonly associated with fine parallel laminations that is traditionally called thinly laminated (TL) layer. The TL layers have been used both in estimating the change in paleooxygenation of the bottom of the Japan Sea and in making correlation with other cores. The observed TL layers in the cores are numbered following some of the foregoing papers depending on the identified tephras. The identified TL layers are described briefly.
