论文部分内容阅读
利用日本理学产Ｄ／ｍａｘ－ｒＢ型转靶Ｘ射线衍射仪，对崂山花岗岩中石英二长岩、黑云二长花岗岩、正长花岗岩和碱性花岗岩四个单元代表性岩体中的钾长石进行粉晶衍射和结构态测试。结果表明，石英二长岩、黑云二长花岗岩中的钾长石均为高微斜长石，ｔ１（ｏ）分别为０．５７和０．５３，ｔ１（ｍ）分别为０．２６和０．２９；正长花岗岩中的钾长石可能属于介于正长石和高微斜长石之间的过渡类型，ｔ１很高（０．９９），但ｔ１（ｏ）≈ｔ１（ｍ），分别为０．５２和０．４７；碱性花岗岩中钾长石也为中微斜长石，但ｔ１（ｏ）＞＞ｔ１（ｍ），分别为０．７６和０．１７。对于从早到晚侵位的花岗岩来说，其钾长石有序度总体上有逐步增高的趋势，其它结构态参数也有相应变化，可认为其受岩浆形成和演化过程中分离结晶作用、不均等的冷却速率、岩浆演化后期热液作用等多种地质作用的影响，这反映花岗岩成岩物理化学条件的综合效果。
In this paper, the K (superscript +) length in representative units of Laoshan granitic quartz monzonite, biotite monzogranite, orthoclase granite and alkaline granite is determined by X-ray diffractometer D / max-rB Stone for powder diffraction and structural state testing. The results show that all the potash feldspar in quartz monzogranite and biotite monzogranite are high-grade plagioclase, with t1 (o) of 0.57 and 0.53, respectively, and t1 (m) of 0.26 and 0.29; the feldspar in the orthoclase granites may belong to the transitional type between the orthoclase and the high-grade plagioclase, with high t1 (0.99), but t1 (o) ≈ t1 (m) 0.52 and 0.47, respectively. The potassium feldspar in alkaline granite is also medium-plagioclase, but t1 (o) >> t1 (m) is 0.76 and 0.17 respectively. For granite that emplaced from early to late, the ordering degree of K-feldspar tends to increase generally, and other structural parameters also change correspondingly. It can be considered that it is separated and crystallized during magma formation and evolution, and not The equal cooling rate and the hydrothermal effect in the later stage of magmatic evolution, which reflect the comprehensive effect of granitoid physicochemical conditions.