爆裂法测定矿物流体包裹体气体成分的主要影响因素探讨  

Discussion on the Main Factors Affecting the Composition Determination of Mineral Fluid Inclusions by Bursting Method

作　　者：刘旺 欧光习[1] LIU Wang;OU Guangxi(Beijing Research Institute of Uranium Geology,Beijing 100029,China)

机构地区：[1]核工业北京地质研究院,北京100029

出　　处：《世界核地质科学》2023年第1期114-125,共12页World Nuclear Geoscience

摘　　要：爆裂法是提取矿物中流体包裹体气/液相成分最常用的方法之一,其中爆裂温度、样品粒度和恒温爆裂时间等参数,直接影响到分析结果的可靠性。以产于内蒙古自治区赤峰市松山区老爷庙附近热液成因的高纯度石英脉为例,通过控制单一实验变量,分别对500℃和550℃两种爆裂温度、380~250μm粒级和250~180μm粒级的两种样品粒度以及5、10、15、20和30 min五种不同的恒温爆裂时间开展对比研究。结果表明:当爆裂温度设置为550℃、样品粒度介于250~180μm之间时,样品中流体包裹体无机气体成分分析结果明显高于相应对比组分析结果,当恒温爆裂时间≥10 min后,样品中流体包裹体无机气体成分分析结果无明显变化。由此认为当爆裂温度设置为550℃,样品粒度介于250~180μm之间时,矿物中包裹体气体成分提取较其他验证参数更完整,另外当恒温爆裂时间超过10 min后,爆裂时间对样品分析结果产生的影响可忽略不计。因此在开展热液成因石英矿物中包裹体成分提取时,建议设置的最佳参数为:爆裂温度为550℃、样品粒度采用250~180μm,爆裂时间为10 min。本研究可为准确测量热液成因石英单矿物中流体包裹体气体成分提供依据。Burst method is one of the most commonly used methods to extract the gas/liquid components of fluid inclusions in minerals.Parameters such as burst temperature,sample size,and constant temperature burst time directly affect the reliability of the analysis results.In this paper,the high-purity hydrothermal quartz vein in Laoyemiao,Songshan District,Chifeng City was taken as an example.By controlling a single experimental variable,comparative experiments were carried out on two burst temperatures of 500°C and 550°C,two sample sizes of 380~250μm and 250~180μm,and five different constant temperature burst times of 5,10,15,20 and 30 min.The results showed that when the burst temperature was set to 550°C and the particle size of the sample was 250~180μm,the analyzed content of the inorganic gas composition of the fluid inclusions in the sample were significantly higher than that of the corresponding comparison group.When the constant temperature burst time is more than 10 min,the analyzed content of the inorganic gas composition of the fluid inclusions in the sample no longer change significantly.Therefore,it is considered that when the detonation temperature is 550℃and the sample particle size is 250~180μm,the gas composition of inclusions in minerals is more completely extracted than other verification parameters.In addition,when the constant temperature detonation time reaches a certain value,the detonation time has no effect on the sample analysis results.According to the above results,it is suggested that the best burst temperature is set to 550°C,the best burst size is set to 250~180μm,and the best burst time is set to 10 min when extracting the inclusions in hydrothermal quartz minerals.This study will provide a basis for accurately measuring the gas phase composition of fluid inclusions in hydrothermal quartz single minerals in the future.

关 键 词：爆裂法 流体包裹体成分 爆裂参数 影响因素 

分 类 号：P599[天文地球—地球化学] P617.9[天文地球—地质学]