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对产出在花岗岩基底中的6722铀矿床长英质隐爆碎屑岩地质构造特征进行了研究,并与我国在相似地质条件下进行的地下核爆炸试验产生的地质效应作了对比,类比计算出形成该隐爆碎屑岩体的爆炸能量(TNT当量)。采用偏光显微镜和透射电镜(TEM)研究隐爆碎屑岩中花岗岩角砾内石英的显微裂隙构造、光性特征及自由位错的类型和密度,并与基底花岗岩(大富足花岗岩体)中的石英进行对比。综合研究阐明6722铀矿床隐爆碎屑岩的形成机制属于一种在高温(>400℃)条件下由瞬间爆炸而产生的脆性变形作用,同时引起石英中位错退火现象的发生。
The geological tectonics of the feldspathic implosion clastic rocks of 6722 uranium deposit in the granite basement are studied and compared with the geologic effects produced by underground nuclear explosions tests under similar geological conditions in China. The explosive energy (TNT equivalent) forming the cryptoexplosive detritus rock mass is calculated. The microscopic fissure structure, photoluminescence and free dislocation types and densities of granitic brecciated quartz in cryptoexplosive clastic rocks were investigated by polarized light microscopy (TEM) and transmission electron microscopy (TEM), and were compared with those of basement granite (Dafujian granite) Quartz for comparison. The comprehensive study shows that the formation mechanism of the implosion clastic rocks in 6722 uranium deposit belongs to the brittle deformation caused by the instantaneous explosion under the condition of high temperature (> 400 ℃), and also causes the occurrence of the dislocation annealing in quartz.