方解石合成流体包裹体在水岩反应实验中的应用
Application of calcite synthetic fluid inclusion in water-rock reaction experiment
摘要
Abstract
Traditional water-rock reaction experiments under high temperature high pressure(HTHP)conditions often result in precipitation or adsorption of the products during the subsequent cooling processes.This issue can be overcome by synthetic fluid inclusion,which enables in-situ entrapment of fluid samples under HTHP conditions,and analyses of fluid composition using a LA-ICP-MS.This study simulates the HTHP(200℃ and 10 MPa)water-rock reaction process between basin brine(NaCl/NaCl+CaCl2)and basement rocks(Triassic diabase,lithic lime-stone,and Middle Triassic tuff)in Lanping Basin,Southwest China,and uses synthesis fluid inclusion in calcite to trap the fluid during reaction.By comparing the fluid composition before and after water rock interactions,we are able to explore the origin of ore-forming metals in the fluids,and their contributions to the formation of the Missis-sippi Valley-type(MVT)Zn-Pb deposits in the basin.Based on microthermometric analyses,the freezing tempera-ture point of synthetic fluid inclusions trapping a 3 m NaCl+0.15 m CaCl2 fluid ranged between-13.6 and-11.4 ℃,while that trapping a 3 m NaCl fluid ranged between-11.8 and-10.7℃,indicating that the fluid com-position trapped within these inclusions is consistent with the initial fluids loaded in our experiment.Furthermore,both microthermometric and LA-ICP-MS analyses demonstrated that this synthetic fluid inclusions method using cal-cite as the host mineral has a nice potential in simulating the relatively low-temperature fluid-rock interactions in nature.关键词
水岩反应/人工合成流体包裹体/方解石/高温高压Key words
fluid-rock reaction/synthetic fluid inclusions/calcite/high temperature-pressure分类
天文与地球科学引用本文复制引用
康玥玥,王召林,刘英超,岳龙龙,周丽,蒲祥亨,杨科,赵思博,马旺,郑远川..方解石合成流体包裹体在水岩反应实验中的应用[J].岩石矿物学杂志,2025,44(3):619-633,15.基金项目
国家自然科学基金(U2444207,92162322,42261144669,42302107,42402084) （U2444207,92162322,42261144669,42302107,42402084）
国家重点研发计划(2022YFF0800903,2024YFC2909905) （2022YFF0800903,2024YFC2909905）
国家资助博士后研究人员计划(GZC20232489) （GZC20232489）
中国地质调查局地质调查项目(DD20230008,DD20243512) （DD20230008,DD20243512）
矿业集团有限公司揭榜挂帅项目(JTKY202427822) National Natural Science Foundation of China(U2444207,92162322,42261144669,42302107,42402084) （JTKY202427822）
National Key Research and Development Program of China(2022YFF0800903,2024YFC2909905) （2022YFF0800903,2024YFC2909905）
National Postdoctoral Researchers Funding Program(GZC20232489) （GZC20232489）
China Geological Survey Project(DD20230008,DD20243512) （DD20230008,DD20243512）
Open Competition Project(Jiebang Guashuai Program)of China Minmetals Group Co.,Ltd.(JTKY202427822) （Jiebang Guashuai Program）
