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如何用X射线粉末数据快速而准确地测定长石成分和结构状态,从来都是矿物和岩石工作者十分关心的问题。这问题在碱性长石已由Wright,等人建立的bc图及a与成分的相关图,以及由此衍生出来的三峰法、201峰及400峰定成分等有关图表所解决。但对斜长石及高三元长石,问题还远未解决。70年代以来,国内外开始有了一些初步方案,例如α~*—γ~*图、卡敏采夫的Cukα2θ_(204-113)~-公式等等。但它们还有待于进一步改进,例如用2θ_(204-113)~-定An时,对这两条峰测定的精度要求如何?这两条峰在粉末图
How to quickly and accurately determine the composition and structure of feldspar with X-ray powder data has always been a concern for mineral and rock workers. This problem has been solved in alkaline feldspar by the bc chart by Wright, et al., And the correlation diagrams of a and components, and the related charts of the trimodal, 201 and 400 peak components derived therefrom. However, plagioclase and high ternary feldspar, the problem is far from resolved. Since the 1970s, some preliminary schemes have been started at home and abroad, for example, α ~ * -γ ~ * diagram, Kamin Sevov’s Cukα2θ_ (204-113) ~ - formula and so on. But they still need to be further improved, for example, with 2θ_ (204-113) ~ - An, the accuracy of the determination of these two peaks What are the two peaks in the powder map