Data for: Oligocene-Miocene (28-13 Ma) climato-tectonic evolution of the northeastern Qinghai-Tibetan Plateau evidenced by mineralogical and geochemical records of the Xunhua Basin

A total of 541 samples were collected at quasi-regular intervals of 3 to 4 m over a continuous stratigraphic interval of 1400 m spanning all four units of the Yangquangou section. Sampled lithologies include conglomerate, medium-coarse sandstone, fine sandstone, siltstone, and mudstone. Partial samples were selected according to lithological characteristics of detrital composition, grain size, and color for X-ray diffraction (XRD) and trace-element concentration measurements.

总计收集了541个样本，这些样本在1400米的连续地层剖面中，跨越了羊曲沟剖面所有四个单元，以3至4米的近似规律间隔采集。采集的岩性包括砾岩、中粗砂岩、细砂岩、粉砂岩和泥岩。根据碎屑成分的岩性特征、粒度和颜色，选取了部分样本进行X射线衍射（XRD）和微量元素浓度测定。