XRD data from the North Pacific CDisK-IV expedition

XRD analyses of the clay fraction of sediment samples collected in Stations 2 and 4 of cruise CDisK-IV. The clay fraction was separated from the bulk sediment by inserting several hundred milligrams of wet sediment into 50 mL centrifuge tubes filled with double distilled water to the 25 mL mark. The tubes were vortexed and settled. After 30 min, 1 mL of the water sample was pipetted from a depth of 2-2.2 cm below the water surface and dehydrated on a silicon slab. X-ray powder diffraction data of the clay fraction of the sediments were collected in Bragg-Brentano geometry on a D8 Bruker diffractometer equipped with a Cu Kα primary beam and a Vantec position sensitive detector. Collection conditions were: 3-60° in 2θ, 0.04° step size, 2.4 seconds/step, divergence slits 0.2 mm.

本数据集为航次CDisK-IV第2、4站位采集的沉积物样品中黏土组分的X射线衍射（XRD）分析数据。黏土组分的分离流程如下：称取取自原始沉积物的数百毫克湿样，装入盛有双蒸水的50 mL离心管中，加水至25 mL刻度线，经涡旋混匀后静置沉降；30分钟后，从水面下2~2.2 cm深度处移取1 mL水样，置于硅片上干燥脱水。沉积物黏土组分的X射线粉末衍射数据采用布拉格-布伦塔诺几何构型，在配备铜靶Kα入射束与Vantec位置灵敏探测器的D8布鲁克衍射仪上完成采集，具体采集参数为：衍射角2θ扫描范围3~60°，步长0.04°，每步计数时长2.4秒，发散狭缝宽度0.2 mm。