摘要
向阳坪地区构造体系由一系列浅层次的脆性剪切带和中深层次的韧性剪切带组成.从韧性剪切带向脆性剪切带转变过程中,K的富集可使富铀岩体发生碱交代,增大其中铀的活化性,并在脆性剪切带中富集成矿.随着流体向上运移,进入到一个半开放体系,液相成分增多,温度和盐度降低.成矿期均一温度和盐度值分别为154～248℃和9.28%～15.2%,与脆性剪切变形阶段温度和盐度条件相似,反映脆性剪切变形阶段主导着向阳坪地区铀成矿作用,脆性剪切带能为铀富集提供充足的空间.
The structure systems of Xiangyangping area are composed of deep ductile shear zones and low brittle shear zones. During the change from ductile shear zones to brittle shear zones, enrichment of K enables alkaline metasomatism with rich - U granite and enlarges U activity which forms orebodies in brittle shear zones. As fluids move upwards to a half - open condition, liquid components increase, Homogenization temperature and salinity respectively are 154 -248℃ while salinity and temperature reduce. and 9.28% -15.2% in ore - forming stage, which is similar to those of brittle shear zones. It is proved that brittle shear activity is critical to uranium forming owing to the fact that it can provide enough space for enrichment of U.
出处
《昆明理工大学学报（自然科学版）》
CAS
北大核心
2011年第5期1-7,共7页
Journal of Kunming University of Science and Technology(Natural Science)
关键词
脆性剪切带
韧性剪切带
铀成矿
brittle shear zone
ductile shear zone
uranium metallogenesis
