摘要
北祁连中段北缘冷龙岭铀矿带处于祁连-龙首山NW向海西碱交代热液型铀成矿带,是典型的钠交代型铀矿带。铀成矿与钠交代有着十分密切的关系,矿体几乎都产在钠交代岩内。矿床内钠交代岩矿物组成上的最大特点是原岩矿物大多消失,代之以红色的钠长石。钠交代使岩石有效孔隙度增大,并且降低了抗压强度,从而成为构造活动的薄弱环节。钠交代促使原岩中铀的赋存状态发生改变,使铀发生活化转移。在钠质交代过程中,许多铀元素的载体矿物被钠长石交代,也是使铀发生活化转移的重要因素。以上事实充分说明,钠交代不仅为铀沉淀提供了良好的空间,而且为铀成矿奠定了物质基础。
The Longling uranium ore zone on north edge of middle section of Northern Qilianshan,a typical uranium ore zone of sodium metasomatic type,locates in Hercynian NW trending uranium metallogenic belt of alkali metasomatic hydrothermal type in Qilian-Longshoushan.The mineralization of uranium is closely related to sodium metasomatism with orebodies of uranium deposit almost all occurred in sodium metasomatic rocks.The mineral assemblages in sodium metasomatic rocks of the U deposit were characterized by disapp...
出处
《矿产与地质》
2009年第1期36-41,共6页
Mineral Resources and Geology
关键词
铀矿床
成矿作用
钠交代
孔隙度
北祁连中段北缘
甘肃
uranium mineralization
sodium metasomatism
porosity
Lenglongling uranium metallogenic zone
northern edge of middle section of Northern Qilianshan
Gansu
