【摘要】 <正> 在70017-291号月岩的岩石学及矿物学研究的基础上,我们又对这块月岩中的矿物、岩石碎片及玻璃体进行了表面结构及形态特征的研究。更多还原

【Abstract】 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.更多还原