It is widely accepted that metamorphism induces a remobilization of iron sulfides, sweeping away original ones while creating new ones. This paper analyzes size distributions of iron sulfides in several samples from the Caples and Torlesse terranes from the Otago Schist (New Zealand) using high-resolution X-ray computed tomography, which allows all iron sulfides larger than the resolution at which X-ray scans were performed to be characterized. Framboids and clusters of framboids are common in unmetamorphosed samples, but disappear in greenschist/amphibolite facies samples, where iron sulfides have anhedral habits. By contrast, the size and standard deviation of the new iron sulfides both remain within the same range. The results illuminate the evolution of iron sulfides throughout metamorphism, proposing boundaries for the metamorphic processes based on the shape of these iron sulfides.

中文翻译：

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形态和基于大小的研究，关于海角和Torlesse地块中硫化铁的变化（奥塔哥·史斯特，新西兰），进行渐进变质演化

变质作用引起硫化铁的迁移，从而清除了原来的硫化物，同时又创造了新的硫化物，这已被广泛接受。本文使用高分辨率X射线计算机体层摄影术分析了奥塔哥史斯特（新西兰）的Caples和Torlesse地层中几个样品中硫化铁的尺寸分布，该技术可使所有硫化铁的尺寸大于X射线扫描的分辨率进行表征。未变形的样品中常见有类碎片和类小分子团簇，但在绿片岩/闪石相样品中消失了，在这些样品中硫化铁具有反手性。相反，新的硫化铁的尺寸和标准偏差均保持在同一范围内。结果阐明了硫化铁在整个变质过程中的演化，