新疆海蓝宝石中包裹体特征、形成条件和鉴别专属性

Characteristics, formation conditions and distinguishing specialization of inclusions in the aquamarines in Xinjiang.

新疆海蓝宝石产于阿勒泰可可托海花岗伟晶岩脉之中 ,呈海蓝宝石的绿柱石中分布多种类型的流体包裹体 ,其中以熔体 -气液流体和 CO2 +H2 O不混溶流体包裹体类型为特征。流体包裹体捕获的温度从大于 70 0℃逐渐降低到 2 0 0℃左右 ,捕获压力从大于 30 0 MPa也递减到 2 0 0～ 10 0 MPa。流体包裹体形成的热力学条件为合成宝石提供了实验数值依据。流体包裹体特殊的组合类型和标志特征以及一定的热力学参数数值是区分本区和其它产地及人工合成海蓝宝石的标志。宝石人工加热后 ,其中 CO2 流体包裹体形态和热力学参数有较大的变化 。

The samples of aquamarine were collected from the Granite pegmatite of Keketuohai in Aletai of Xinjiang. There are many kinds of inclusions in these samples and the assemblage of melt gas liquid and CO 2+H 2O immiscible fluid inclusions is of the distinctive characteristics. The trapping temperatures of the inclusions range from over 700 to 200 ℃ and trapping pressures from over 300 MPa to 200~100 MPa. The special kinds of inclusions and their thermodynamic parameters are the most effective indicators by which the aquamarines in this region can be distinguished from those in the other regions and from synthetic or treated aquamarines.