Microstructural defects in experimentally shocked diopside: A TEM characterization
Microstructural defects in experimentally shocked diopside: A TEM characterization
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DOI：
10.1007/bf00211847
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发表时间：
1994-05
影响因子：
1.4
通讯作者：
H. Leroux;J. Doukhan;F. Langenhorst
中科院分区：
文献类型：
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作者：
H. Leroux;J. Doukhan;F. Langenhorst
用透射电镜研究了透辉石单晶在冲击实验中产生的缺陷显微结构。在晶体中发现的冲击引起的缺陷可以分为四种不同的类型：1）高密度和普遍分布的位错在滑移配置（滑移系统（100）[02]机械孪晶层，主要平行于（100），（001）孪晶层不太丰富。（3）4）不均匀分布的微小熔融区（3 ~ 20 μm），冷却后呈现出与原始透辉石化学成分非常接近的玻璃形态。透射电镜研究表明，受冲击的透辉石中的缺陷显微结构由多种冲击诱导缺陷组成。特别是在静态变形的透辉石中从未观察到的无定形PDF似乎是冲击硅酸盐矿物的一个重要特征显微结构缺陷。虽然存在的无定形PDF尚未确认自然冲击单斜辉石，我们强烈建议，这些功能可以作为一种诊断工具，用于识别我们的太阳系的所有行星体的影响现象。
Transmission electron microscopy was used for characterizing the defect microstructure induced by shock experiments in a single crystal of diopside. The shock-induced defects found in the crystal can be divided in four distinct types:1)A high density and pervasive distribution of dislocations in glide configuration (glide systems (100)[02)Mechanical twin lamellae, mostly parallel to (100), the (001) twin lamellae are less abundant. li]3)4)Heterogeneously distributed tiny molten zones (3 to 20 μm size) which, after cooling, appear as a glass with a chemical composition very close to the one of the original diopside.The present TEM study reveals that the defect micro-structure in shocked diopside consists of a large variety of shock-induced defects. Especially, the amorphous PDFs which were never observed in statically deformed diopside seem to be an important characteristic micro-structural defects in shocked silicate minerals. Although the presence of amorphous PDFs is not yet confirmed for naturally shocked clinopyroxene, we strongly suggest that these features can serve as a diagnostic tool for recognizing impact phenomena on all planetary bodies of our solar system.