缅甸、哈萨克斯坦和俄罗斯翡翠矿物化学组成及结构特征
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摘要
利用宝石学、偏光显微镜和电子探针方法研究缅甸、哈萨克斯坦、俄罗斯所产翡翠的矿物化学组成和结构特征,结果表明缅甸翡翠Si O2、Al2O3、Na2O的含量接近硬玉理论值,哈萨克斯坦及俄罗斯翡翠Si O2、Al2O3、Na2O的含量与硬玉理论值存在偏差;缅甸翡翠硬玉矿物的含量多于哈萨克斯坦及俄罗斯翡翠,同时含有少量钠长石及铬铁矿;哈萨克斯坦翡翠以绿辉石及硬玉为主,同时含有少量钠长石及铬铁矿;俄罗斯翡翠中硬玉向绿辉石过渡。缅甸翡翠以变晶结构为主,局部有交代结构及动力变质结构;哈萨克斯坦翡翠结构类型复杂,后期经过强烈的地质作用;俄罗斯翡翠以变晶结构为主,局部有交代结构,后期动力变质作用较哈萨克斯坦翡翠弱。翡翠成矿具有多期性,缅甸翡翠硬玉的形成分为两期,哈萨克斯坦翡翠绿辉石的形成分为两期,俄罗斯翡翠硬玉的形成分为三期,成矿期次对翡翠结构有较为重要的影响。
The mineral chemistry composition and structural characteristics of jadeite from Burma,Kazakhstan and Russia were studied by gemological,thin-section analysis and electron probe method.The results on mineral chemical composition show that the content of Si O2、Al2 O3、Na2 O is different,jadeite samples from Burma are approach to theoretical value of jadeite,while jadeite samples from Kazakhstan and Russia deviate from theoretical value. The jadeite from Burma is characterized by the most jadeite content,and relatively lower albite and chromite contents. The jadeite from Kazakhstan is characterized by relatively average content of jadeite and omphacite,as well as a small amount of albite and chromite. The chemical composition of Russian jadeite makes the transition to omphacite. The jadeite from Burma consists crystalloblastic texture as well as partially metasomatic texture and dynamic metamorphism texture. Jadeite from Kazakhstan consists relatively complex texture types,with a strong geological process in last period. Russian jadeite consists crystalloblastic texture and partiallycrystalloblastic texture,going through weaker dynamic metamorphism. The Jadeite deposit is multistage;the formation of jadeite from Burme has 2 stages; the formation of omphacite from Kazakhstan has 2 stages; The formation of jadeite from Russia has 3 stages; the metallogenic stages have important influence on the structure of Jadeite.
The mineral chemistry composition and structural characteristics of jadeite from Burma,Kazakhstan and Russia were studied by gemological,thin-section analysis and electron probe method.The results on mineral chemical composition show that the content of Si O2、Al2 O3、Na2 O is different,jadeite samples from Burma are approach to theoretical value of jadeite,while jadeite samples from Kazakhstan and Russia deviate from theoretical value. The jadeite from Burma is characterized by the most jadeite content,and relatively lower albite and chromite contents. The jadeite from Kazakhstan is characterized by relatively average content of jadeite and omphacite,as well as a small amount of albite and chromite. The chemical composition of Russian jadeite makes the transition to omphacite. The jadeite from Burma consists crystalloblastic texture as well as partially metasomatic texture and dynamic metamorphism texture. Jadeite from Kazakhstan consists relatively complex texture types,with a strong geological process in last period. Russian jadeite consists crystalloblastic texture and partiallycrystalloblastic texture,going through weaker dynamic metamorphism. The Jadeite deposit is multistage;the formation of jadeite from Burme has 2 stages; the formation of omphacite from Kazakhstan has 2 stages; The formation of jadeite from Russia has 3 stages; the metallogenic stages have important influence on the structure of Jadeite.
引文
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[7]常丽华,陈曼云,金巍,等.透明矿物薄片鉴定手册[M].北京:地质出版社,2006:150-196.
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