四川盐边基性-超基性杂岩体中斜长石矿物学研究  

THE MINERALOGICAL STUDY ON THE PLAGIOCLASES FROM BASIC-ULTRABASIC COMPLEX IN YANBIAN, SICHUAN PROVINCE

作　　者：沈上越 张保民 

机构地区：[1]中国地质大学

出　　处：《矿物岩石》1989年第3期17-25,共9页Mineralogy and Petrology

摘　　要：作者运用光学法、红外光谱法、X射线法、化学分析法对杂岩体各岩带中斜长石进行了详细的研究。由角闪辉长岩带→角闪橄榄岩带,斜长石由An57.4→An60.7→An82.3→An87.8;Ca质成分增加,Na质、K质成分减少,与其寄主岩的化学成分变化一致;斜长石有序度及结晶温度缓慢增加,其物理化学条件越来越趋于稳定。按Козлова最新斜长石双晶成因分类观点,该杂岩体斜长石双晶律为深成岩成因型。根据斜长石红外光谱波数特征与相应化学成分结果,求出了两个相关方程。同时,作者还比较了几种不同测试方法测量An含量的精度。The authors have studied in detail the plagioelase in each rock belt of a complex by optical, infrared spectra, X-ray and chemical analysis, It was shown that from amphibole-gabbro belt to amptibole-peridotitic belt, the An of plagioclase ranges from 57.4→60.7→82.3→87.8; the Ca content increases and Na and K contents decrease, coordinating with variation of chemical composition of parasitic rock; with the slow growth of the degree of order and crystalline temperature, the physical and chemical conditions tend to become more and more stable. Plagioclase twins in the complex are of plutonic origin in accordance with newest classification of plagioclase twin genesis. The authors set up two corresponding equations according to wave-number character of infrared spectra and relevant chemical composition. The authors compared at the same time the precision of An content determined by several different test methods.

关 键 词：基性岩 超基性岩 斜长石 矿物学 

分 类 号：P588.12[天文地球—岩石学]