四川蛇纹石猫眼的地质特征及显微结构分析  

Geological and micro-texture analysis of Serpentine Cat's Eye from Sichuan province

作　　者：季江华[1] 卢保奇[1] 亓利剑[2] 

机构地区：[1]上海大学材料科学与工程学院,上海200072 [2]同济大学海洋与地球科学学院,上海200092

出　　处：《上海国土资源》2015年第1期105-108,共4页Shanghai Land & Resources

基　　金：国家自然科学基金项目(49772096);上海市教育委员会发展基金项目(03AK23)

摘　　要：蛇纹石猫眼是一种具有猫眼效应的罕见玉石品种。本文主要探讨了蛇纹石猫眼的地质特征,采用光学显微镜对产于四川石棉县的蛇纹石猫眼样品进行了显微结构分析。结果表明:四川蛇纹石猫眼的组成矿物蛇纹石的形态主要有微纤维状和鳞片状。岩石的显微结构主要有微纤维变晶结构、微鳞片变晶结构、交代假象结构和网格状结构,并以前者为主,约占30%。微纤维变晶结构是蛇纹石猫眼形成的主要原因。交代假象结构主要表现为蛇纹石对早期矿物橄榄石和辉石的交代而表现出橄榄石和辉石的假象。交代假象结构和网格状结构的存在证明了蛇纹石猫眼的岩石成因为超基性岩石的蛇纹石化作用。Serpentine Cat’s Eye from Sichuan Province is one of the most rare and precious jades in the world. This paperoutlines the geological features of this jade and investigates its micro-textures using an optical microscope. Results showthat mineral shapes in Serpentine Cat’s Eye are primarily of two types： a micro-fibroblastic texture and a leaf-like texture. Themicro-fibroblastic texture is dominant, accounting for about 30% of mineral shapes, and is the main cause of the formationof serpentine Cat’s Eye. Serpentine metasomatic pseudomorphic textures exist as pseudomorphic textures in olivine andpyroxene, which were more recently replaced by serpentine. The metasomatic pseudomorphic texture and the netted textureof serpentine illustrate that ultrabasic rock serpentinization is the geological mechanism for the formation of serpentine Cat’s Eye from Sichuan Province.

关 键 词：蛇纹石猫眼 地质特征 显微结构 岩石成因 

分 类 号：P578.964[天文地球—矿物学]