摘要
本文作者在全国１４个典型矿区的野外工作基础上，进行了超基性－酸性侵入岩与碳酸盐岩的接触交代实验；火山气热液与火山岩的相互交代实验；区域沉积变质和混合岩化过程中的交代作用实验。实验结果表明，在３５０－７００℃和３００×１０￣５－１４００×１０￣５ｐａ的温度、压力条件下，在ｌｏｇｆＯ＿２＝－２８．６３７－－１６．５１４的氧逸度范围内，在ｐＨ＝４．０－１１．０的含不同浓度Ｎａ、Ｋ卤化物的溶液中，形成了水榴石、水钙铝榴石、钙铝榴石、钙铁榴石以及水榴石、水钙铝榴石、水钙铝榴石－钙铝榴石和钙铝榴石－钙铁榴石的过渡性矿物。用显微镜、Ｘ射线衍射和红外光谱等分析方法，测定了它们的主要光学特征。最后，通过物理化学条件的分析，揭示了它们形成的交代机理。
Based on field work in fourteen typical ore districts of China,the author made experimcnts on contact metasomatism of ultrabasic-acid intrusive rocks with canrbonate rocks,interacton between volcanic pneumatolyto-hydrothermal solution and volcanic rocks,and metasomatism in the process of sedimentary metamorphism and migmatization. The results show that hibschite,hydrogor-ssular,gorssulnr,andradite and their transitional minerals hibschite-hydrogro-ssular,hydrogrossular-grossular and grossular-andradite might be formcd in aqueous solution with,Na halides of different concentrations and pH 4.0-ll.0 undei the conditions of 350-700℃,300×10￣5-1400×10￣5pa and logfO_2--28.637--16.514.The main optical properties of these minerals were deter-mined by such methods as microscopy, X-ray diffraction analysis and infrared absorption spectrometry.Finally,their formation mechanism was revealed through an analysis of physicochemical conditions.
出处
《岩石矿物学杂志》
CAS
CSCD
1994年第4期342-352,T002,共12页
Acta Petrologica et Mineralogica
基金
地质行业基金
关键词
石榴子石
钙铝-钙铁系列
成因机理
experimentation on metasomatism
characteristics of garnets of grossular-andradite series
genetic mechanism
