Mica kink-band geometry as an indicator of coseismic dynamic loading

Mica kink-band geometry as an indicator of coseismic dynamic loading
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云母扭结带几何形状作为同震动态载荷的指标

DOI:
10.1016/j.epsl.2021.117000
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发表时间:
2021
影响因子:
5.3
通讯作者:
Cruz-Uribe, Alicia M.
Cruz-Uribe, Alicia M.
中科院分区:
地球科学1区
文献类型:
--
作者:
Anderson, Erik K.;Song, Won Joon;Johnson, Scott E.;Cruz-Uribe, Alicia M.

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认识到折返剪切带具有孕震历史,是研究震源区能量分配微观结构的重要前提。通过对砂丘拐角剪切带的光学测量,我们证明了它们的几何性质与经历了区域变形和变质的云母中的扭结有显著的不同。砂丘拐角剪切带岩石的扭结带不对称性和外旋转角较大,扭结带宽度较小。我们的数据与动态形变实验、陨石撞击和核爆炸现场的扭结带有显著的相似之处,表明它们的形成是动态的。我们的结果表明,云母扭结带可能是岩石记录中动态加载和古地震活动的有用指示。
Recognizing that exhumed shear zones had a seismogenic history is an important prerequisite for microstructural studies of energy partitioning in the earthquake source region. Using optical measurements of kinked micas along the Sandhill Corner shear zone, a seismogenic fault/shear zone exhumed from the base of the frictional-to-viscous transition, we demonstrate that their geometric properties are statistically different from kinks in micas that underwent regional deformation and metamorphism. Kink-band asymmetries and the angles of external rotation are larger in rocks from the Sandhill Corner shear zone, whereas kink-band widths are smaller. Our data show remarkable similarities to kink bands from dynamic deformation experiments, meteorite impacts, and nuclear explosion sites, suggesting a dynamic origin for their formation. Our results suggest that mica kink bands may be a useful indicator of dynamic loading and paleoseismicity in the rock record.
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