We examined the shock effects on 12 basaltic and 4 cumulate eucrites, using the petrographic and X-ray diffraction (XRD) methods. Petrographic and XRD measurements were conducted on the same polished sections of the eucrites. On the basis the ranges of undulatory extinction angles and occurrence of maskelynite, we defined five shock degrees: A (unshocked to very weakly shocked), B (weakly shocked), C (moderately shocked), D (moderately to highly shocked), and E (highly shocked). We performed macroscopic XRD analyses of the polished sections of the eucrites using the in-plane rotation method. The results of XRD analysis are correlated with the shock degrees obtained through the petrographic observations. The averaged full width at half maximum (FWHM) values of diffraction peaks are increase from shock degree A to E. As the FWHM value reflects the lattice spacing, the observed increase in the averaged FWHM values indicates the reduction in their crystallinities because of shock metamorphism. Therefore, the petrographic and XRD methods are both useful indicators in the evaluation of the shock degrees of eucrites.

我们使用岩石学和X射线衍射（XRD）方法检查了对12个玄武岩和4个累积玉石的冲击作用。岩相和X射线衍射测量是在珠光体的相同抛光部分进行的。根据波状消光角的范围和蒙皮石的发生，我们定义了五个冲击度：A（未冲击至非常弱冲击），B（弱冲击），C（中冲击），D（中冲击至高度）和E（非常震惊）。我们使用面内旋转方法对珠光体的抛光部分进行了宏观XRD分析。XRD分析的结果与通过岩石学观察获得的冲击程度相关。衍射峰的平均最大半峰宽（FWHM）值从冲击度A增加到E. 由于FWHM值反映了晶格间距，因此观察到的平均FWHM值增加表明，由于冲击变质，其结晶度降低。因此，岩相学和X射线衍射方法都是评价硬质合金冲击程度的有用指标。