基于LA-(MC)-ICP-MS的矿物原位微区同位素分析技术及其应用

近年来，激光剥蚀技术与单接收或多接收电感耦合等离子体质谱法联用（LA-(MC)-ICP-MS）得到了广泛应用，实现了由激光剥蚀系统对固体岩矿样品微区采样后产生的气溶胶输送至电感耦合等离子体质谱的同位素分析，具有原位、实时、快速的分析优势及高空间分辨率、高灵敏度、多元素及其同位素比值同时测定的优点。本文介绍了本实验室近年来开展和建立的基于LA-(MC)-ICP-MS的一系列矿物微区原位同位素分析方法，主要有含硼矿物（如电气石、白云母）的硼同位素组成、碳酸盐矿物的碳同位素组成、硫化物和硫酸盐矿物的硫同位素组成、含锶矿物（如磷灰石）的锶同位素组成、锆石的铪同位素组成，以及锡石、黑钨矿、独居石、榍石和石榴子石等矿物的U-Pb定年分析方法。

In Situ Micro-analysis of Isotopic Compositions of Solid Minerals Using LA-(MC)-ICP-MS Methods and Their Applications

In recent years, laser ablation technology combined with single or multi collector inductively coupled plasma mass spectrometry (LA-(MC)-ICP-MS) has been widely used to analyze the isotopic compositions of solid rock and ore mineral samples by means of aerosol transported to inductively coupled plasma mass spectrometer after micro sampling by laser ablation system, which has the advantages of in situ, real-time, fast, and nondestructive analysis and its high spatial resolution, high sensitivity, simultaneous determination of multi-element and its isotope ratios. This paper introduced a series of in situ micro-analytical methods of isotopic compositions developed and established by the author′s laboratory in recent years, mainly including boron isotopic composition of boron-rich minerals such as tourmaline and muscovite, carbon isotopic composition of carbonate minerals, sulfur isotopic composition of sulfide and sulfate minerals, strontium isotopic composition of strontium-rich minerals such as apatite and hafnium isotopic composition of zircon, as well as U-Pb dating methods of cassiterite, wolframite, monazite, titanite and garnet.