Accurate quantification of the modal mineralogy of rocks when image analysis is difficult
Accurate quantification of the modal mineralogy of rocks when image analysis is difficult
复制标题
当图像分析困难时准确量化岩石的模态矿物学
作者：
P. Schofield;K. S. Knight;S. Covey;G. Cressey;I. Stretton
摘要 通过固定几何 X 射线粉末衍射数据的全图案剥离，对两种强烈变形的橄榄石-斜方辉石岩石中矿物相的体积比例进行了量化。将结果与通过飞行时间中子粉末衍射数据的 Rietveld 精修确定的相比例进行比较，结果显示非常一致。 X 射线技术不仅提供了一种非常快速且经济高效的确定相比例的方法，而且还避免了与通过图像分析获取此信息相关的几个问题。此外，该技术在强纹理岩石或含有显着残余应变的岩石中特别有利。因此，它提供了一种强大的技术来分析细粒和/或变形实验产品的矿物成分，这使得它在实验室实验期间原位监测矿物反应的进展方面具有相当大的潜力。
Abstract The volume proportions of the mineral phases in two strongly deformed olivine-orthopyroxene rocks have been quantified by whole-pattern stripping of fixed geometry X-ray powder diffraction data. The results were compared with the phase proportions as determined by Rietveld refinement of time-of-flight neutron powder diffraction data, and were shown to be in excellent agreement. The X-ray technique not only provides a very rapid and cost-effective method of determining phase proportions, but it also circumvents several of the problems associated with obtaining this information by image analysis. Moreover, the technique is particularly advantageous in strongly textured rocks or in rocks that contain significant residual strains. As such it offers a powerful technique for analysing the mineralogical composition of fine-grained and/or deformed experimental run products, which makes it of considerable potential for monitoring in situ the progress of mineral reactions during laboratory experiments.