竹山和马鞍山绿松石微量元素和稀土元素特征

Trace Elements and Rare Earth Elements Characteristics of Turquoise from Zhushan and Ma′anshan Area

对竹山和马鞍山两地绿松石的微量元素和稀土元素特征作了对比研究,同时分析了两地绿松石矿物特征和结构特征。采用X射线能谱、电感耦合等离子体质谱、X射线衍射、红外吸收光谱和扫描电镜等测试技术对竹山和马鞍山地区的绿松石样品进行岩石矿物学特征分析。结果表明,竹山与马鞍山地区绿松石在微量元素的含量上存在较大的差别,但主成分含量基本一致;两地区绿松石的稀土元素均富集重稀土,二者的稀土配分模式图出现镨反向,马鞍山地区的绿松石表现出铕负异常;马鞍山绿松石的结晶程度优于竹山县绿松石。该方法对绿松石产地划分的研究具有应用价值。

Trace elements contents and rare earth elements（REEs） characteristics of turquoise samples from Zhushan and Ma′anshan area were analyzed.The analysis techniques of X-ray Energy Dispersive Spectrometry,Inductively Coupled Plasma-Mass Spectrometry（ICP-MS）,X-ray Diffraction Analysis（XRD）,Infrared Spectrometry（IR） and Scanning Electron Microscope（SEM） were applied in this study on the mineral and structure characteristics.Research results indicated that trace elements contents of turquoise from the two areas were very different,but consistent in major elements compositions.Heavy rare earth elements（HREEs） were enriched in samples from both areas,however,the REEs distribution pattern diagram presented Pr reverse.Samples from Ma′anshan area showed negative anomaly in Eu.The research also indicated that turquoises from Ma′anshan area have better crystallinity than that from Zhushan.The studied method is suitable for the identification of turquoise.