初步运用LA-ICP-AES区分不同产地的绿松石

目前宝玉石文物无损，微损分析检测技术发展较快，激光剥蚀电感耦合等离子体光谱法(LA-ICP-AES)作为几乎无损的分析方法具有多重优点。尝试采用该方法检测包括辣子崖采矿遗址绿松石在内的东秦岭五处不同产地的绿松石样品，获得样品的主，微量元素数据。运用主成分模型(PCA)分析数据结果，得到3个主成分，其累计方差贡献率达84.96%。前两个主成分的方差贡献率为72.29%，确定其所对应的V₂O₅，NiO，B₂O₃，SrO，BaO，CaO，ZrO，MnO₂为不同产地绿松石的特征化学成分。经相关化学成分的对比分析发现，不同矿点所产绿松石样品在某些化学成分含量方面存在差异，且相关化学成分的比值散点图也呈现一定程度的产地聚集性，两种分析方式相结合可基本实现不同产地绿松石的鉴别。还发现某些化学成分含量存在某种程度的正，负相关关系，此现象既可以成为研究绿松石矿的成因的线索，亦可以作为样品的产地特征。研究结果初步表明LA-ICP-AES结合PCA和化学成分含量对比分析，在一定程度上具有区分不同产地绿松石的功能。

Application of LA-ICP-AES to Distinguish the Different Turquoise Mines

Currently,the technological development of non-destructive analysis and micro-damage analysis of turquoise is fast. LA-ICP-AES,an almost non-destructive analysis,has multiple advantages.This paper attempts to use this analysis method to examine sample turquoise from five places of origin on Mount East Qinling,including ancient turquoise ore in Laziya,in order to attain its major element and microelement data.Then the paper uses PCA to analyze and study its chemical elements in a compar-ative way.Three main elements are gained through analysis,and their cumulative variance contribution rate has reached 84.96%.The former two main elements’variance contribution rate is 72.289%.Therefore,the corresponding elements,inclu-ding V2 O5 ,NiO,B2 O3 ,SrO,BaO,CaO,ZrO,MnO2 ,are the featured chemical elements of turquoise from different places of origin.Through comparative analysis and research on corresponding chemical elements,turquoise samples produced by different ores vary in terms of the content of some chemical element and chemical components.Two analysis methods combined together will basically realize the appreciation of turquoise in various places of origin.In addition,the research indicates that some chemi-cal contents have positive or negative correlations.Such correlations can be regarded as features of producing area,and can also provide clues as to the cause of formation of turquoise ore.This study preliminarily indicates that LA-ICP-AES combined with PCA and comparative analysis of chemical composition and content has the function of distinguishing turquoise produced in dif-ferent places of origin to a certain extent.