Shock Remanent Magnetization Intensity and Stability Distributions of Single‐Domain Titanomagnetite‐Bearing Basalt Sample Under the Pressure Range of 0.1?10?GPa
Shock Remanent Magnetization Intensity and Stability Distributions of Single‐Domain Titanomagnetite‐Bearing Basalt Sample Under the Pressure Range of 0.1?10?GPa
复制标题
0.1?10?GPa压力范围内含单畴钛磁铁矿玄武岩样品的冲击剩磁强度及稳定性分布
DOI：
10.1029/2021gl092716
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发表时间：
2021
影响因子：
5.2
通讯作者：
Hasegawa Sunao
中科院分区：
文献类型：
--
作者：
Sato Masahiko;Kurosawa Kosuke;Kato Shota;Ushioda Masashi;Hasegawa Sunao
了解激波剩余磁化（SRM）特性对于解释在撞击坑观测到的磁异常的空间变化至关重要。本文报道了含钛磁铁矿玄武岩单畴SRM强度和稳定性的空间分布，基于二级轻气枪与Al弹丸的SRM采集实验、分亚样品的残余测量和撞击模拟。SRM性能随压力的增加而发生系统变化，在不同压力范围内表现出三个特征：(1)在0.1 GPa以下强度恒定，(2)在1.1 GPa以下强度与压力成正比，呈线性趋势，(3)在1.9 GPa以上强度恒定且稳定性增强。SRM强度和稳定性分布表明，含单畴钛磁铁矿的地壳岩石最初的SRM强度分布是根据与撞击点的距离而变化的，而SRM强度分布则取决于撞击后的残余稳定性。
Knowledge of the shock remanent magnetization (SRM) property is crucial to interpret the spatial changes in magnetic anomalies observed over the impact crater. This study reports the spatial distributions of SRM intensity and stability of single‐domain titanomagnetite‐bearing basalt based on the SRM acquisition experiments using a two‐stage light gas gun with Al projectiles, remanence measurements for divided subsamples, and impact simulations. The SRM properties systematically change with increasing pressure, and three distinctive aspects are recognized at different pressure ranges: (1) constant intensity below 0.1 GPa, (2) linear trend as intensity is proportional to pressure up to 1.1 GPa, and (3) constant intensity and increasing stability above 1.9 GPa. The SRM intensity and stability distributions suggest that the crustal rocks containing the single‐domain titanomagnetite originally had an SRM intensity distribution according to the distance from the impact point, which changed depending on the remanence stability after the impact.