摘要
水是矿物流体包裹体的重要组成,承载着流体性质和演化信息。提取矿物包裹体中水的方法主要有真空破碎法及爆裂法。为了减少真空破碎法表面积增大引起水的吸附以及爆裂法在高温下发生同位素交换反应,本文自制了一个在线提取装置,以高纯He作为载气,与高温裂解装置-稳定同位素质谱仪(EA/HT-IRMS)相连,进行一系列的条件实验,确认了方解石矿物包裹体中水的氢同位素组成在线测试的关键技术参数。实验证实,当爆裂温度为420℃、爆裂时间为5 min、含水量为0.1~0.3μL时,利用在线提取装置-EA/HT-IRMS对方解石矿物包裹体中水的δD进行测试的精密度优于±1.5‰(1σ)。相对于传统离线分析方法,本方法实现方解石矿物包裹体中水的在线提取及氢同位素组成的在线测试,简化了操作流程,并提高实验测试效率。
Objectives: Water is an important component of fluid system carrying information on the nature and evolution of fluid. Water is usually extracted from fluid inclusions by mechanical vacuum crushing technique and thermal decrepitation. An on-line extraction device was invented to reduce water adsorption of surface increasing by vacuum crushing and isotope exchange reaction by thermal decrepitation and measure δD in water from calcite mineral inclusions.Methods: The on-line extraction device was connected with thermal decrepitation elemental analyzer plus isotope ratio mass spectrometry in pure helium. The key technical parameters of hydrogen isotope composition in Water from Fluid Inclusion of Calcite mineral were confirmed by carrying out a series of conditional experiments.Results: After a series of conditional experiments,the parameters are optimized with the 420℃ reactor temperature,5 min cracking reaction time,0. 1 ~ 0. 3 μL water content of mineral inclusions. The precision of δD in water from calcite mineral inclusions is better than ±1. 5‰( 1σ) .
作者
金贵善
刘汉彬
韩娟
李军杰
张建锋
张佳
石晓
JIN Guishan;LIU Hanbin;HAN Juan;LI Junjie;ZHANG Jianfeng;ZHANG Jia;SHI Xiao(Beijing Research Institute of Uranium Geology,Beijing,100029)
出处
《地质论评》
CAS
CSCD
北大核心
2020年第1期255-261,M0002,共8页
Geological Review
基金
国家重点研发计划项目“华南热液型铀矿基地深部探测技术示范”(编号:2017YFC0602600)的成果~~
关键词
方解石
流体包裹体
在线测试
爆裂法
水中氢同位素组成
calcite
fluid inclusion
on-line measurement
thermal decrepitation
hydrogen isotope composition of water
