XRD mineralogy of sediment core PS2641-4@en

We employ the quantitative X-ray diffraction method developed by Eberl (2003, 2004). The sediment < 2 mm are spiked by 10% by weight of zincite, milled, and the samples are scanned on a D5000 Siemens X-Ray Diffractometer between 5° and 65° 2-theta with a 0.02° step and a 2-sec count. The resulting 3000 data points are loaded into the Excel macro-program Rockjock v6 (Eberl, 2003) and the weight% of minerals in the sediment mixtures calculated against a suite of 124 \"standard\" mineral patterns (Eberl, 2003). Finally, the data are normalized to sum to 100%本研究采用Eberl于2003年、2004年提出的定量X射线衍射（X-ray Diffraction）方法。将粒径小于2 mm的沉积物按重量比掺入10%的红锌矿（zincite）后进行研磨，随后将样品置于西门子D5000型X射线衍射仪上进行扫描，扫描的2θ角度范围为5°至65°，步长0.02°，每步计数时长为2秒。最终得到的3000组数据点被导入Excel宏程序Rockjock v6（Eberl，2003），基于124套‘标准’矿物衍射图谱（Eberl，2003）计算沉积物混合物中各矿物的质量百分比。最后将所有数据归一化至总和为100%