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.

本次共采集3700件样品，采样分辨率约为10厘米，采集前先移除风化露头表层，该移除的表层至少覆盖最上层0.5米的厚度。将每件样品研磨为粉末后，取约5克过200目筛。随后在中国地质大学（武汉）（Chinese University of Geoscience (Wuhan)），采用Innov-X系统便携式能量色散X射线荧光光谱仪（X-ray fluorescence spectrometer），以地球化学模式，分别使用束流1（50千伏）与束流（10千伏）对样品进行测试。再取约0.5克过筛后的粉末样品过150目筛，随后在中国地质大学（武汉）使用奥林巴斯Terra BTX II型X射线衍射分析仪（X-Ray Diffraction Analyzer）测定矿物含量。每件样品的测试时长至少为25分钟。