Data for: Cenozoic magnetostratigraphy of the Xining Basin, NE Tibetan Plateau, and its constraints on paleontological, sedimentological and tectonomorphological evolution

Table 1 Characteristic remanent magnetization (ChRM) directions of the East Xining (EXN) and Shuiwan-Guanjiashan (SW-GJS) sections; Table 2 Composite proxy records of Cenozoic sediments from the Xining Basin.For the proxy records from the Table 2, the carbonate contents, Ca/Al ratios, sediment redness, magnetic susceptibility records, and sedimentation rate were obtained from two outcrop sections and one borehole core, located at Xiejia, Mojiazhuang, and Tashan in the Xining Basin, respectively. The proxy records from the gypsum horizons have been removed. The carbonate content was measured using the Karbonat-bombe method with errors of ca. 0.5 wt.%. The Ca/Al ratios in bulk samples roughly represent the relative contents of gypsum. Concentrations of Ca and Al in bulk samples for the whole section were determined using ICP-OES (Leeman Labs Prodigy-H) at the Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing. Lightness (L*) and redness (a*) were measured using a Minolta-CM2002 spectrophotometer. Low-frequency mass-specific magnetic susceptibility (χ) was measured at 470 Hz using a Bartington Instruments meter and MS2B sensor.

表1 西宁东部（EXN）与水湾-关家山（SW-GJS）剖面的特征剩磁（Characteristic remanent magnetization, ChRM）方向；表2 西宁盆地新生代沉积复合代用指标记录。针对表2中的代用指标记录，其碳酸盐含量、Ca/Al比值、沉积物红度、磁化率记录及沉积速率，分别取自西宁盆地谢家、莫家庄与塔山的2个露头剖面及1个钻孔岩芯，且已剔除石膏层位的代用指标数据。碳酸盐含量采用Karbonat-bombe法测定，误差约为0.5 wt.%。全剖面块状样品的Ca/Al比值大致可反映石膏的相对含量。全剖面块状样品中Ca与Al的浓度，由位于北京的中国科学院青藏高原研究所使用电感耦合等离子体发射光谱仪（ICP-OES，Leeman Labs Prodigy-H型）完成测定。亮度（L*）与红度（a*）采用Minolta-CM2002型分光光度计进行测量。低频比质量磁化率（χ）采用Bartington Instruments公司的仪器及MS2B传感器，在470 Hz频率下测得。