摘要
LA-ICP-MS面扫描分析近些年来发展的新兴技术,相对于其他面扫描仪器,其具有样品制样流程简单、仪器购置和分析成本低、分析时间短、检测限低、多元素表面分析(<5μm)、近乎无损等分析优势,在地球科学和生物学领域有着大量的应用。本文系统介绍了作者应用Photon Machines激光剥蚀系统与安捷伦ICP-MS新开发矿物元素面扫描分析方法。该方法基于近些年来开发的双室样品仓技术和Matlab软件,通过自主开发的LaIcpMsSoftware(LIMS)进行数据处理来完成的。本次研究开发的激光面扫描分析技术可以在短时间内(2小时)分析3mm×3mm区域,并同时给出多组元素(包括稀土元素等)在二维平面的分布特征。论文详细描述了LIMS工作原理和特点,相对于国外同类型软件,LIMS具有操作简单,并具有多种数据显示模式和剖面切割展示,元素比值面分布分析等优势,便于后期数据分析与解译。同时,还展示了对斜长石、白钨矿和石榴子石进行面扫描分析的初步结果。研究表明,通过LA-ICP-MS面扫描,可以获得比点分析更为准确的元素分布特征,并能够更为直观的展示不同元素在矿物分布特征和相关关系,更好的开展矿物地球化学研究。
In recent years, laser ablation inductively coupled plasma mass spectrometry （LA-ICP-MS） mapping is a new key analytical application to obtain chemical compositions in analyzed sample. LA-ICP-MS mapping has great advantages, e.g., easy sample preparing, low cost of equipment, fast, low detection limit, multi elemental analysis, comparing to other modern mapping techniques. Here we present a new LA-ICP-MS mapping method based on the PhotonMachines laser ablation system with Agilent ICP-MS system. This mapping method is based on two-volume cell laser system and Matlab coding data reduction software named LaIcpMsSoftware （LIMS）. This new method can generate multi-elements （more than 30） pictures of 3mm×3mm mineral in less than 2 hours. Compared with other mapping software, LIMS has many advantages, e.g., easy to operation, variety data display mode and cutting section display, element ratio mapping, to facilitate data analysis and interpretation for geologist. We demonstrate mapping results of magmatic plagioclase, hydrothermal scheelite and skarn garnet and constrain the origin of such minerals in terms of mapping results. Our datasets reveal that LA-ICP-MS mapping can reveal geochemical details that cannot be appreciated with single spot analysis, and it is easier to get elements correlations to better understand the geochemical process in mineral.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2017年第11期3422-3436,共15页
Acta Petrologica Sinica
基金
国家重点研发计划课题(2016YFC0600206
2016YFC0600404)
国家自然科学基金项目(41373035
41320104003)联合资助
