地下核爆炸石灰岩的冲击变质与实验研究

SHOCK METAMORPHISM OF LIMESTONE INDUCED BY UNDERGROUND NUCLEAR EXPLOSION AND ITS EXPERIMENTAL STUDY IN THE LABORATORY

本文介绍我国在石灰质介质中一次地下核爆炸所引起的空腔壁外围的冲击变质作用，及其实验研究成果。

Reported in this paper are the metamorphism of the limestone uear the cavity wall induced by an underground nuclear explosion and the results of laboratory study. This underground test produced an about 20 cm-thick recrystallized calcite zone outside the cavity wall. This zone was formed at about 1350°-1400℃ and 60000 atm., as indicated by our laboratory study. All the limestone in a distance of 54.5 m away from the cavity wall was .affected by shock waves and thus underwent varying degrees of deformation. as exemplified by twin gliding, bending, folding, and cracking. Varying degrees of bending deformation were also observed in calcite crystals. By comparing with the cha-racteristics of limestone deformation at given temperature and pressure, the tempera-ture and pressure undergone by the limestone medium can be estimated.