Shock amorphization of plagioclase, from partial to complete, has been used to evaluate the degree of shock in meteorites. Important information on the shock amplitude can be derived from the measurement of the refractive index in plagioclase, either from mineral separates or in petrographic thin sections. However, this technique is time‐consuming, and associated sample preparations are considered destructive and are not always possible for precious and rare meteorite samples. In addition, plagioclase amorphization is commonly inhomogeneous at the sample scale and a statistically meaningful number of grains must be considered. Here, we apply several nondestructive spectroscopic techniques, such as Raman spectroscopy, photoluminescence, and cathodoluminescence, to plagioclase experimentally shocked at 28 GPa, and thus in the transition regime between crystalline plagioclase and fully amorphous material. Most of the plagioclase was transformed into diaplectic glass at 28 GPa, yet some grains exhibit heterogeneously distributed crystalline domains. This confirms that intrinsic and extrinsic factors lead to local variations in the intensity of the shock pressure within individual plagioclase crystals of homogeneous composition. The amorphization of plagioclase can qualitatively (and potentially also quantitatively) be investigated by spectroscopic techniques, highlighting such local variations in the shock efficiency.

中文翻译：

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实验性震荡斜长石的部分非晶化：光谱研究

斜长石的震荡非晶化（从部分到完全）已用于评估陨石的震荡程度。关于震荡幅度的重要信息可以从斜长石的折射率测量中得出，斜长石来自矿物分离物或岩相薄片。但是，此技术非常耗时，并且相关的样品前处理被认为具有破坏性，对于珍贵和稀有的陨石样品并非总是可行。此外，斜长石非晶化通常在样品规模上是不均匀的，必须考虑统计学上有意义的晶粒数量。在这里，我们将拉曼光谱，光致发光和阴极发光等几种非破坏性光谱技术应用于实验上以28 GPa震荡的斜长石，因此处于结晶斜长石和完全非晶态材料之间的过渡状态。大部分斜长石在28 GPa时转变为双折玻璃，但有些晶粒表现出不均匀分布的晶畴。这证实了内在和外在因素导致均质组成的各个斜长石晶体内的冲击压力强度发生局部变化。斜长石的无定形可以通过光谱技术定性地（并且还可能在定量上）进行研究，从而突出了电击效率的这种局部变化。这证实了内在和外在因素导致均质组成的各个斜长石晶体内的冲击压力强度发生局部变化。斜长石的非晶化可以通过光谱技术定性地（并且还可能在定量上）进行研究，从而突出了这种冲击效率的局部变化。这证实了内在和外在因素导致均质组成的各个斜长石晶体内的冲击压力强度发生局部变化。斜长石的非晶化可以通过光谱技术定性地（并且还可能在定量上）进行研究，从而突出了这种冲击效率的局部变化。