福建南平花岗伟晶岩及其围岩中云母的矿物学研究  

Study on the Micas in Granitic Pegmatite and Their Wall Rocks in Nanping, Fujian Province

作　　者：杨岳清[1] 王文瑛[1] 倪云祥 陈成湖[3] 朱锦煌[3] 

机构地区：[1]中国地质科学院矿床地质研究所,北京100037 [2]美国国家自然博物馆,惠顿20902 [3]福建省闽北地质大队,邵武354000

出　　处：《福建地质》1997年第2期61-84,共24页Geology of Fujian

摘　　要：白云母作为造岩矿物之一，广泛分布于南平各类伟晶岩中。随着伟晶岩类型的变化，白云母的产状、物理性质、结构、化学成分等均发生有规律的变化，特别是在Ⅳ类型伟晶岩中，白云母Rb、Cs含量的明显增高，指示了该类伟晶岩具有良好的稀有金属矿化。另外，Ⅳ类型伟晶岩夹层中发育的铝黑鳞云母，它是由变质岩系中的黑云母蚀变而来，其Rb、Cs含量更高，也是寻找稀有金属伟晶岩特征的标型矿物。Micas are a very widespread mineral in pegmatite and wall rocks of Nanping area. After feldspars and quartz, the muscovites are the most abundant constituent in the Nanping pegmatite. From I-type to Ⅳ -type pegmatite, the muscovites are quite diverse in their chemical composition, typomorphic properties and mineral associations. Rb, Cs, Li and F contents of muscovite in N -type pegmatite are comparatively high, Rb2O= 0. 8%, Cs,O= 0. 07%, Li2O =0.06%, F=0. 35 %. In contrast with the content of muscovite in the I -type pegmatite,that of the Ⅳ-type pegmatite increases by 2 times、 3 times、10 times and 2 times.Chemical composition and species of micas reflect geological environments for their formation, thus playing an indicating role in prospecting for mineralization. Mica is rich in rare alkali formed in pegmatite and the quartz-mica schist is related to properties of wall rocks and rich rare alkali elements in the pegmatite melt-solution. It is therefore known that mica can serve as a typomorphic mineral in the rare metal pegmatite deposit.

关 键 词：花岗伟晶岩 白云母 矿物学 造岩矿物 蚀变 变质岩系 产状 南平 分等 稀有金属 

分 类 号：P619.281[天文地球—矿床学] P578[天文地球—地质学]