Data from the Guide Basin in the NE Tibet over the past 13.7-10 Ma

A total of 3700 samples (~10 cm sampling resolution) were collected after removal of the weathered outcrop surface (this removed surface corresponds to a minimum of the uppermost 0.5 m). Approximately 5 g of each sample were ground into powder and passed through a 200-mesh sieve. Samples were measured by a portable energy-dispersive Innov-X Systems X-ray fluorescence spectrometer in geochemistry mode using beam 1 (50 kv) and beam (10 kv) at the Chinese University of Geoscience (Wuhan). About 0.5 g of each powdered sample was further sieved using a 150-mesh screen, and mineral contents were subsequently determined using a Olympus Terra BTX II X-Ray Diffraction Analyzer at the Chinese University of Geoscience (Wuhan). The measurement time for each sample was at least 25 min.

本数据集共获取3700件样品，采样分辨率约10厘米。样品采集前需先清除风化露头表层，清除的表层厚度不小于0.5米。取每份样品约5克研磨为粉末，过200目筛。在中国地质大学（武汉），使用Innov-X Systems公司生产的便携式能量色散X射线荧光光谱仪，以地球化学测试模式，分别采用束流1（50千伏）与束流（10千伏）对样品开展测试。另取每份经上述处理的粉末样品约0.5克，过150目筛后，在中国地质大学（武汉）使用Olympus Terra BTX II型X射线衍射分析仪测定矿物含量。每份样品的测试时长不少于25分钟。