Fluid Inclusion Geochemistry in Hydrothermal Systems
Summary
Fluid inclusion geochemistry examines microscopic droplets of palaeo-fluids trapped within minerals to reconstruct the physicochemical conditions of ancient hydrothermal systems. By analysing the composition, salinity and phase behaviour of these inclusions through microthermometry and spectrometric techniques, researchers derive key parameters such as trapping temperature, pressure and fluid origin. Isotopic ratios (for example, of hydrogen, oxygen, carbon and sulphur) and trace element signatures further reveal processes of fluid–rock interaction, redox evolution and metal transport. Combined, these approaches elucidate the sources of mineralising fluids—ranging from magmatic and metamorphic to basinal brines—and the mechanisms that concentrate metals into ore deposits. Beyond ore genesis, fluid inclusion geochemistry informs geothermal resource assessment and carbon sequestration strategies by detailing fluid pathways, thermal histories and fluid mixing within the crust. Global advances in analytical precision now enable the detection of minute variations in volatile content, noble gas isotopes and halogen ratios, refining models of mineral system evolution and aiding exploration for critical raw materials and energy resources.
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Fluid Inclusion Geochemistry in Hydrothermal Systems publication trend
The graph below shows the total number of articles in fluid inclusion geochemistry in hydrothermal systems across all publications each year (not limited to Nature Index journals).
Technical terms
Fluid inclusion: Minute pocket of trapped fluid within a mineral, preserving the composition and physical state of hydrothermal fluids at the time of entrapment.
Microthermometry: Analytical technique measuring phase changes (e.g., melting, homogenisation) in inclusions to determine trapping temperatures and salinities.
Salinity: Total dissolved-solute concentration of an inclusion, usually expressed as weight percent NaCl equivalent, indicative of fluid concentration.
Cl/Br ratio: Molar chloride-to-bromide ratio used to distinguish fluid sources (e.g., marine, basinal, metamorphic) and mixing processes.
Trace element geochemistry: Quantification of minor and trace elements in inclusions to infer fluid–rock reactions, metal transport pathways and ore-forming conditions.
References
- Tracing fluid signature and metal mobility in complex orogens: insights from Pb-Zn mineralization in the Pyrenean Axial Zone. Mineralium Deposita (2024).
- Multistage fluorite mineralization in the southern Black Forest, Germany: evidence from rare earth element (REE) geochemistry. European Journal of Mineralogy (2023).
- Metal budget and origin of aqueous brines depositing deep-seated Zn-Pb mineralization linked to hydrocarbon reservoirs, North German Basin. Mineralium Deposita (2023).
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