摘要
黄沙坪铅锌多金属矿床位于南岭多金属成矿带中部。本文利用电子探针对矽卡岩中的含锡石榴石进行了系统的研究。研究结果表明,石榴石属于钙铁榴石—钙铝榴石系列。早期生成富钙铝榴石组分的石榴石,晚期生成富含钙铁榴石组分的石榴石,并且多具有震荡环带。而且,钙铁榴石—钙铝榴石中普遍含有锡,但锡在两种系列的石榴石中的含量有差异;SnO_2含量随钙铁榴石组分的增加而增加。石榴石中SnO_2与FeO_x的含量呈正比,与Al_2O_3含量成反比。Sn^(4+)替代Fe^(3+)。并可观察到锡石以独立矿物的形式析出在石榴石的裂隙中。
Huangshaping lead-zinc polymetallic deposit is located in the middle of Nanling polymetallic matallogenic belt. By using the electron probe microprobe analysis technique（ EPMA）,we studied the garnets in tin-bearing skarn deposit systematically. The results show that the garnets in Huangshaping deposit belong to the series of grossular and andradite. In the early stage,garnets are mainly grossular. In the late stage,as the reactions continue,the ore-forming solution shifts from acidic to alkaline and the oxygen fugacity increases,garnets are mainly andradite. Moreover,Sn element exists in both kinds of garnets. But the contents of tin in the two kinds of garnet are different. The content of SnO2 increases as the component of andradite increases. In the garnets,there is a negative correlation between the contents of SnO2 and Al2O3,but the content of SnO2 is in a positive correlation with FeOx. The tin exists mainly as independent cassiterite in crack of the garnets.
出处
《电子显微学报》
CAS
CSCD
2016年第2期118-125,共8页
Journal of Chinese Electron Microscopy Society
关键词
黄沙坪
铅锌矿床
电子探针
含锡石榴石
Huangshaping
lead-zinc deposit
electron probe microprobe analysis technique（EPMA）
Tin-bearing garnet
