Carbon is a ubiquitous volatile found in geothermal fluids.During the migration of carbon released from the mantle to the near surface,i.e.the carbonate precipitation or magma degassing,its isotopic signature allows to obtain precious information on the source of carbon(organic vs.inorganic),fluid mixings and mass fractionation processes.Therefore,geochemical characteristics of deep carbon release processes in geothermal areas are of great significance for understanding the migration of deep-sourced heat and high-temperature fluids in magma-heated geothermal systems.Numerous studies have been attempted to quantify the source of volatiles in geothermal fluids and disentangle isotope fractionation processes in geothermal areas using carbon isotopes.These processes are related to mantle source heterogeneities,magma degassing,calcite precipitation,gas dissolution or degassing,metamorphic processes,mixing of shallow soil/organic carbon sources,etc.These processes are too numerous and often overlapping to be easily discriminate.Therefore,it is urgent to summarize the methodologies used for disentangle these various processes to provide a reference or studies of carbon in geothermal systems.In order to promote further understanding of the deep carbon cycle process and its climatic and environmental effects,the characterization and scale of deep carbon emissions in geothermal areas are briefly reviewed in this paper.
Deep carbonGeothermal fluidsCarbon isotopeQuantitative study
万方数据
维普
