Isotopic and Elemental Imaging of Geological Materials by Laser Ablation Inductively Coupled Plasma‐Mass Spectrometry

Laser ablation ICP‐MS represents a promising new development for the acquisition of elemental and isotopic images from a variety of different materials. Compared to existing methods for imaging, it offers relatively rapid throughput, very wide dynamic range, a relatively clean mass spectrum, utility at a variety of scales (from μm to cm) and multi‐element/isotopic capability. Although developing rapidly in the biological sciences, the method has not yet seen widespread application to geological materials. This contribution documents some preliminary experiments aimed at understanding the fundamental aspects of elemental and isotopic image acquisition using laser ablation ICP‐MS. In particular, we note that ablation cell designs must be optimised to promote rapid system response, in contrast to the signal‐smoothing that is often preferred for simple spot analyses. Furthermore, experimental parameters must be carefully evaluated on a system‐by‐system basis to avoid the blurring effects of re‐sampling phenomena. With careful attention to these details, and development of appropriate data processing software, laser ablation ICP‐MS imaging has much to offer workers in the Earth and environmental sciences.