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斜长石是自然界最常见的造岩矿物,一般认为它是完全类质同象系列的典型代表。然而近代研究发现,斜长石在地质体中出现的概率是不均等的,呈不连续的众数分布。在斜长石的X射线衍射、电子衍射、光学性质以及红外吸收光谱所记录的相关曲线上,出现反映结构变化的不连续点,这些不连续点与上述稳定斜长石(呈众数者)的成分点一致。另外,斜长石的非布拉格“卫星”衍射等都说明斜长石超结构对斜长石的稳定性起着重要的制约作用。本文以大量的实际资料,把斜长石的内部结构和斜长石各种物理化学性质联系起来,讨论各种斜长石成分的分布规律,并提出低结构态斜长石分类。
Plagioclase is the most common rock-forming mineral in nature, and is generally considered to be a typical representative of a complete isomorphic series. However, modern studies have found that the probability of plagioclase appears in the geological body is not uniform, was discontinuous mode of distribution. In the correlation curve recorded by X-ray diffraction, electron diffraction, optical property and infrared absorption spectrum of plagioclase, there appear discontinuous points which reflect structural changes. These discontinuities and the above-mentioned stable plagioclase (in mode of number) The same point of the ingredients. In addition, non-Bragg “satellite” diffraction of plagioclase shows that the plagioclase structure plays an important role in the stability of plagioclase. In this paper, a large number of actual data, the internal structure of plagioclase and plagioclase various physical and chemical properties linked to discuss the distribution of various plagioclase composition, and proposed low-grade plagioclase classification.