摘要
为研究缅甸翡翠次生部位的元素成分演化特征,采用主量元素测试、微量元素测试、电子探针及X射线粉晶衍射分析方法对缅甸翡翠的灰绿色次生色(翡翠界称之蓝雾)部位、黄蓝色次生色部位及黄(红)色次生色(翡翠界称之黄(红)雾)部位的元素及矿物成分进行了测试与分析。结果显示,与蓝色次色生部位相比较,黄色次生色部位中的Na、Al、Si元素的含量递增对应着X粉晶衍射中伊利石等的出现,黄色次生色部位的Fe、Mg等元素的含量递减对应着绿泥石的峰的消失。表明带有蓝雾的砾石被抬升到地表后,其中的大量的Fe被偏酸性的雨水淋滤带出,少量被氧化成Fe3+后沉淀形成黄、红雾。氧化条件加上湿热气候区偏酸性水的作用,能够使绿泥石和硬玉矿物逐渐地风化分解,形成高岭石和褐铁矿。
In order to study the compositional variation of the secondary jadeite jade from Myanmar, elements and mineral compositional characteristics in blue, blue-yellow and yellow-red fog zones of secondary Myanmar jade were studied by using ICP-MAS, ME-ICP06, EPMA and XRD. Results show that compared to the blue fog zone, Na, and Si contents increase significantly and illite presents in yellow fog zone, while iron group elements, Mg and Ag decrease significantly and chlorite disappears in the yellow fog zone. This indicates that with the boulder lifted to the surface to suffer weathering and acid rain effect, a large number of Fe2＋ in chlorite of blue fog zone was oxidized into Fe3＋, migrated outside, and partially precipitated in situ to form yellow-red fog zone, in which the iron content was much lesser than in blue fog zone. During this processes, chlorite and jadeite were gradually decomposed with the formation of hematite and kaolinite.
出处
《矿物学报》
CAS
CSCD
北大核心
2014年第1期60-66,共7页
Acta Mineralogica Sinica
基金
广东省科技计划基金资助项目(编号:0711220600019)
关键词
翡翠
次生色
蓝雾
黄(红)雾
Myanmar jade
secondary color
blue fog zone
yellow-red fog zone
