摘要
作为热液成因矿床中最为主要的贯通性矿物，石英的内部结构和成分在不同成矿阶段会产生系统性变化。石英粉末漫反射红外光谱1200cm^-1～400cm^-1指纹谱段对此变化较为敏感，可以用来指示不同成矿阶段石英与成矿的关系。研究对山西义兴寨金矿1070m中段M0#脉、1#脉，2#脉，3#-4#矿体，M30脉，950m和830m中段的50脉和6#脉41件不同成矿阶段的石英粉末进行漫反射红外光谱测试，并利用1070m中段各矿脉石英粉末光谱特征参数进行矿物学填图。结果表明，非对称伸缩振动谱带1085cm^-1半高宽值与石英晶格中的类质同像替换浓度有关，类质同像杂质浓度愈高，1085cm^-1半高宽相对愈大；填图结果指示该值与金品位值的分布对应性较好。对称伸缩振动谱带800cm^-1和780cm^-1的吸收强度与石英所经历的构造差应力呈正相关关系，填图结果表明800cm^-1和780cm^-1吸收强度高值区与金品位高值区的分布几乎趋于一致。红外结晶指数表征石英晶体的结晶程度，随着成矿温度逐渐降低，石英的结晶程度从无序逐渐向有序转化，红外结晶指数也随之减小。
As a most important mineral of hydrothermal deposit, quartz varied systematically in internal structure and composition at different mineralization stages. FTIR diffused reflection is sensitive to the systematic variations. In this study, 41 pieces of quartz powder from 1 070 m level are used for FTIR measurement and the spectral parameters for mineralization mapping are exploited. It is indicate that the absorption intensity of 800 cm^-1 and 780 cm^-1 , and the locations of symmetric stretching vibration, are positively correlated to the tectonic stress, which is also reflected in the mineralization mapping. Due to isomorphism displacement in the quartz, the values of 1085 cm half width is correlated with the gold grade distribution of quartz vein. IR crystallization index represents degree of crystallization of quartz. With the decrease of metallogenic temperature, the quartz crystallizes in an ordered way gradually and the IR crystallization index is also decreased.
出处
《矿物岩石》
CAS
CSCD
北大核心
2009年第1期25-32,共8页
Mineralogy and Petrology
基金
全国危机矿山接替资源找矿项目(200714009)
高等学校学科创新引智计划(B07011)
