Staurolite is an important mineral that can reveal much about metamorphic processes. For instance, it dominates the Fe–Mg exchange reactions in amphibolite-facies rocks between about 550 and 700°C, and can be also found at suprasolidus conditions. Staurolite contains a variable amount of OH in its structure, whose determination is a key petrological parameter. However, staurolite is often compositionally zoned, fine-grained, and may contain abundant inclusions. This makes conventional water analysis (e.g., Fourier transform infrared (FTIR) spectroscopy or by chemical titration) unsuitable. With its high sensitivity at high spatial resolution, Nanoscale Secondary Ion Mass Spectrometry (NanoSIMS) is potentially a valuable tool for determining water contents in staurolite. However a calibration with relevant standards covering a large range of water content is required to obtain accurate and reliable analyses, because matrix effects typically prevent direct quantification of water content by SIMS techniques.

中文翻译：

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纳米二次离子质谱法测定十字石的含水量

十字石是一种重要的矿物，可以揭示很多关于变质过程的信息。例如，它在大约 550 至 700°C 之间的角闪岩相岩石中主导 Fe-Mg 交换反应，并且也可以在超固相线条件下发现。十字石在其结构中含有可变数量的 OH，其测定是关键的岩石学参数。然而，十字石通常在成分上是带状的、细粒的，并且可能含有丰富的夹杂物。这使得传统的水分析（例如，傅里叶变换红外 (FTIR) 光谱或化学滴定）不适合。纳米级二次离子质谱 (NanoSIMS) 凭借其在高空间分辨率下的高灵敏度，可能是确定十字石中水含量的有价值的工具。