中国新疆塔西南地区阿尔塔什剖面古地磁数据（2021）

数据内容包含塔西南地区阿尔塔什剖面古地磁样品天然剩磁、热退磁和磁化率各向异性，该数据主要用于阿尔塔什剖面磁性地层学工作。结合同位素测年的结果，根据地磁场极性倒转在岩石或沉积物中的记录与标准极性柱对比建立阿尔塔什剖面年代框架。课题组成员在2020年-2021年主要采用钻机以1 m为间隔在剖面上钻取古地磁定向样品（回到实验室加工成2 cm圆柱体），个别地区采集定向手标本样品（回到实验室加工成2 cm*2 cm*2 cm的立方体）。古地磁实验测试仪器包括两部分：1.岩石超导磁力仪，用于测量古地磁样品的剩磁及岩石磁性参数；2.MFK卡帕桥，用于测量地质样品的磁化率及磁化率各向异性。以10 m间隔选取样品首先完成测试，共298件，其中221件获得稳定剩磁，成功率为74%。根据初步古地磁学结果建立塔西南地区阿尔塔什剖面的年代框架；全部古地磁学结果完全测试后，结合准确的同位素年代，将建立塔西南地区高精度磁性地层序列。

This dataset comprises natural remanent magnetization (NRM), thermal demagnetization, and anisotropy of magnetic susceptibility (AMS) data for paleomagnetic samples collected from the Altash section in southwestern Tarim Basin, and is primarily utilized for magnetostratigraphic studies of this section. Combined with isotopic dating results, the chronological framework of the Altash section will be established by correlating records of geomagnetic polarity reversals preserved in rocks or sediments with the standard geomagnetic polarity timescale. From 2020 to 2021, the research team primarily drilled oriented paleomagnetic samples from the section at 1-meter intervals using a drilling rig; these samples were processed into 2 cm-diameter cylinders in the laboratory. Oriented hand specimens were also collected in some localities, which were fabricated into 2 cm × 2 cm × 2 cm cubes in the laboratory. The paleomagnetic experimental setup includes two core instruments: 1. Superconducting rock magnetometer, used to measure the remanent magnetization and rock magnetic parameters of paleomagnetic samples; 2. MFK Kappabridge, employed to measure the magnetic susceptibility and anisotropy of magnetic susceptibility of geological samples. Initially, samples were selected at 10-meter intervals for testing, totaling 298 specimens, of which 221 yielded stable remanent magnetization, with a success rate of 74%. A preliminary chronological framework for the Altash section in southwestern Tarim Basin has been established based on the initial paleomagnetic results; upon completion of full testing of all paleomagnetic data and combination with precise isotopic ages, a high-precision magnetostratigraphic sequence for the Altash section in southwestern Tarim Basin will be established.

搜集汇总

背景与挑战

背景概述

该数据集提供了中国新疆塔西南地区阿尔塔什剖面的古地磁数据，涵盖41百万年至39.7百万年（晚始新世）的样品，包括天然剩磁、热退磁和磁化率各向异性，用于建立磁性地层年代框架。数据基于2020-2021年采集的298件样品，成功率为74%，以Excel格式开放获取，适用于古环境研究。