摘要
利用外束质子激发X射线荧光(PIXE)分析技术对国内外软玉进行主量和微量元素测定,并分析软玉在化学成分上存在的差异与玉矿成矿机理和地质环境之间的关系。软玉依据成矿机理不同可以分为2种类型:第一种类型的软玉由花岗闪长岩和白云石大理岩接触交代而形成,主要化学成分偏向于透闪石,但是少数样品受地质环境影响会变为阳起石;第二种类型的软玉由镁橄榄石与中-低温热液交代作用而成的蛇纹岩再同围岩(大理石或白云石)接触交代蚀变而形成,主要化学成分接近甚至已转化为阳起石。第二种类型的软玉比第一种类型的软玉含有更多的Cr、Co、Ni等过渡金属元素。两种类型玉石的微量元素含量上的差异可为主要成分为软玉的中国古代玉器的玉料来源判定提供科学参考。
External-beam proton induced X-ray emission （PIXE） was applied to measure the contents of major and trace elements of nephrite samples from China and other countries.In this paper,the relationship between the diversity of chemical composition of nephrite samples and the metallogenic mechanism and geological environment of nephrite deposits was analyzed.Depending on different metallogenic mechanisms,nephrite samples can be divided into two types.The first type nephrite samples,whose major chemical composition are close to tremolite but maybe transform to actinolite influenced by geological environment in a few cases,are formed by contact metasomatism between granodiorite and dolomitic marble;the second type nephrite samples,whose major chemical composition are closer to actinolite,are formed by contact metasomatism between serpentine,which is formed by metasomatism between boltonite and low-medium temperature hydrotherm,and wall rock （marble or dolomite） .Compared with the first type nephrite samples,the second type nephrite samples always contain more transition metal such as Cr,Co,Ni and so on.The variance of contents of trace elements can be used as scientific reference for judging the source of materials of Chinese archaic jades whose major chemical composition is nephrite.
出处
《矿物学报》
CAS
CSCD
北大核心
2010年第3期367-372,共6页
Acta Mineralogica Sinica
基金
中国科学院知识创新工程项目(KJC3.SYW.n12)
国家自然科学基金青年基金(No.50702066)
