The chemostratigraphy of sediment core JC138-29GC was analysed with the ITRAX core-scanning X-ray fluorescence system (Cox Analytical Systems) at BOSCORF. The ITRAX produced a digital X-radiograph for each core, and then returned to the start point and underwent XRF analyses for the elements in the range of molar weight from Si to U. The instrument was operated at a voltage of 30 kV, a current of 30 mA, a count time of 30 s with a 3kW Mo X-ray tube.