青藏高原尖扎盆地磁化率数据

本数据集由尖扎盆地加让剖面样品磁学分析和元素分析数据组成。尖扎盆地加让剖面位于青藏高原东北部，具有较厚的新生代沉积地层，以风尘堆积为主，夹杂有部分河湖相层段，是研究青藏高原隆升和亚洲内陆干旱环境演变的重要信息载体。剖面总厚度为约361米，我们按照约20厘米的间隔对加让剖面开展了系统的样品采集，一共收集了1800个粉末样本，用于岩石磁学和地球化学指标测试；同时采集了1729 个定向块状样品，尺寸约为 10 x 10 x 10 立方厘米，用来进行古地磁测量。将经过低温烘箱烘干过的干燥样品进行低频 (470 Hz) 和高频 (4700 Hz)的磁化率测试，分别使用了Bartington MS-2磁化率仪和MS2B传感器；最终得到样品的质量磁化率和频率磁化率。实验分析是在中国科学院地球环境研究所环境磁学重点实验室完成的。该数据反应了尖扎盆地361m厚的晚新生代沉积的磁性地层学和古环境记录。对于研究青藏高原的隆升、亚洲内陆干旱化及亚洲冬夏季风的形成演化过程具有重要意义。This dataset comprises magnetic and elemental analysis data from samples collected at the Jiarang section in the Jianzha Basin. Situated in the northeastern Tibetan Plateau, the Jiarang section preserves thick Cenozoic sedimentary strata dominated by eolian deposits with interbedded fluvio-lacustrine layers, serving as a critical archive for investigating the uplift of the Tibetan Plateau and the evolution of arid environments in inland Asia. The total thickness of the section is approximately 361 meters. We performed systematic sampling along the Jiarang section at ~20 cm intervals, collecting 1800 powdered samples for rock magnetic and geochemical index assays, as well as 1729 oriented block samples measuring ~10 × 10 × 10 cm³ for paleomagnetic measurements. Low-temperature oven-dried samples were tested for low-frequency (470 Hz) and high-frequency (4700 Hz) magnetic susceptibility using a Bartington MS-2 magnetic susceptibility meter and MS2B sensor, respectively, generating mass-specific and frequency-dependent magnetic susceptibility values. All experimental analyses were conducted at the Key Laboratory of Environmental Magnetism, Institute of Earth Environment, Chinese Academy of Sciences. This dataset records the magnetostratigraphic and paleoenvironmental signatures of the 361-meter-thick late Cenozoic sediments in the Jianzha Basin, and is of great importance for research on the uplift of the Tibetan Plateau, inland Asian aridification, and the formation and evolution of the Asian winter and summer monsoons.