阿波罗-17月海玄武岩表面形态及结构的扫描电镜研究

SURFACE MORPHOLOGICAL AND TEXTURAL STUDIES OF APOLLO-17 MARE BASALT BY SCANNING ELECTRON MICROSCOPE

提供扫描电镜观察的样品是将重约1克的原样，在无尘操作箱中用敲击法取原样边缘直径为1毫米的颗粒，并在双目镜下选出直径为0．05—0．2毫米的长石、钛铁矿及玻璃，样品重约20毫克，使用粘结剂粘结后，置于扫描电镜样品座上。

Scanning electron microscopic observation of rock fragments, minerals and glass from the 70017-291 mare basalt indicates the presence of glassy spheres of silicate caused by impact melting. Silicate glass fragments were noticed as impact ejecta adhering to the surface of glassy sphere. Metallic grains are enclosed by silicate glassy materials and exhibite fluidal structure. This indicates that mare basalts were subject-ed to repeated meteoritic impact. It is suggested that the lunar crystalline rock sample we investigated was probably collected from the soil near the landing site of Apollo-17. Some microfractures and undulatory extinction have been observed within pyrox-ene grains under microscope and plastic deformation noticed in plagioclase. So, there are some signs of impact metamorphism in the mare basalt.