论文标题
玄武岩中实验性冲击引起的熔融静脉：改善欧几里岩的冲击分类
Experimentally shock-induced melt veins in basalt: Improving the shock classification of eucrites
论文作者
论文摘要
玄武岩岩石广泛出现在陆地行星上，而分化的小行星（包括小行星4维斯塔）。我们在日本千叶理工学院的陆地玄武岩上进行了腐烂的压缩脉冲进行了冲击恢复实验。样品记录了一系列压力，并进行了冲击物理模型，以增加观察到的冲击特征的压力尺度。通过光学显微镜和电子显微镜，背裂片衍射法和拉曼光谱检查检查了震惊的样品。我们发现，局部熔化发生在较低的压力（〜10 GPA）下（> 20 GPA）。震中附近的令人震惊的玄武岩代表了最近提出的玄武岩欧几里特分类方案的休克度C，因此，我们的结果为分类方案提供了压力量表。最后，我们估计，通过假设在Vesta上的撞击速度分布，将其归类为Chopl Legure C的玄武岩的总比例约为15％。
Basaltic rocks occur widely on the terrestrial planets and differentiated asteroids, including the asteroid 4 Vesta. We conducted a shock recovery experiment with decaying compressive pulses on a terrestrial basalt at Chiba Institute of Technology, Japan. The sample recorded a range of pressures, and shock physics modeling was conducted to add a pressure scale to the observed shock features. The shocked sample was examined by optical and electron microscopy, electron back-scattered diffractometry, and Raman spectroscopy. We found that localized melting occurs at a lower pressure (~10 GPa) than previously thought (>20 GPa). The shocked basalt near the epicenter represents shock degree C of a recently proposed classification scheme for basaltic eucrites and, as such, our results provide a pressure scale for the classification scheme. Finally, we estimated the total fraction of the basaltic eucrites classified as shock degree C to be ~15% by assuming the impact velocity distribution onto Vesta.
