Shock Remanent Magnetization Intensity and Stability Distributions of Single-Domain Titanomagnetite-Bearing Basalt Sample Under the Pressure Range of 0.1-10 GPa

Y 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.

Automated summary

This study investigates the spatial distributions of SRM intensity and stability of single-domain titanomagnetite-bearing basalt under different pressures, identifying three distinctive aspects: constant intensity below 0.1 GPa, linear trend as intensity is proportional to pressure up to 1.1 GPa, and constant intensity and increasing stability above 1.9 GPa. The findings suggest that the SRM properties of crustal rocks containing single-domain titanomagnetite change according to pressure levels, ultimately affecting their distribution after impact.