Inorganic Geochemistry

Inorganic geochemistry explores the distribution, speciation and cycling of chemical elements in Earth’s crust, mantle, oceans and atmosphere. It addresses how minerals form and weather, how elements partition between solid, liquid and gaseous phases, and how fluids transport metals and volatiles through the crust. Key concerns include the mechanisms of element mobilisation during magmatism, metamorphism and hydrothermal circulation, the pathways of carbon and sulphur compounds between lithosphere and surface reservoirs, and the behaviour of trace metals in natural waters and sediments. By combining field measurements, laboratory experiments and thermodynamic modelling, inorganic geochemists reconstruct the conditions under which ores form, assess subsurface resource potential, gauge volcanic and tectonic degassing, and trace anthropogenic impacts on element cycles. Advances in spectrometric and isotopic techniques now permit high-precision studies of isotope fractionation, mineral-fluid equilibria and reaction kinetics at micrometre scales. This knowledge underpins applications ranging from volcanic hazard assessment to water-quality management and critical-element exploration.

Research from Nature Portfolio

Recent field investigations across collisional orogens have demonstrated that continental underthrusting drives prolific crustal carbon release. In one transect spanning the Himalayan-Tibetan belt, combined in-situ CO₂ flux measurements with helium and carbon isotopes reveal that metamorphic decarbonation of deeply buried crustal rocks yields CO₂ outputs comparable to global mid-ocean-ridge emissions. Such findings elevate active collisional margins to key contributors in the global carbon budget. Elsewhere, isotopic studies of hydrothermal fluids in plateau settings have employed coupled He–CO₂–N₂ systematics to map lithospheric-scale fault networks. Correlations between ³He/⁴He ratios and regional strain rates indicate that mantle-derived volatiles modulate plateau growth dynamics, linking deeply sourced fluids to surface uplift processes and offering a template for integrating geochemistry with geodynamics.

Inorganic Geochemistry publication trend

The graph below shows the total number of articles in inorganic geochemistry across all publications each year (not limited to Nature Index journals).

Technical terms

Partition coefficient (Kd): Ratio of an element’s concentration in a mineral to that in the coexisting fluid or melt, indicating compatibility during crystallisation or dissolution.

Isotope fractionation: Mass-dependent separation of isotopes between phases or chemical species, used to trace sources and processes.

Decarbonation: Release of CO₂ during metamorphic or magmatic reactions, often through breakdown of carbonate minerals under high temperature and pressure.

Fluid-rock interaction: Chemical exchange between fluids and minerals, driving metasomatism, alteration and element mobilisation.

Metasomatism: Chemical modification of rocks by infiltrating fluids or melts, resulting in mass transfer and formation of new mineral assemblages.

References

1. High helium reservoirs in the Four Corners area of the Colorado Plateau, USA. Chemical Geology (2022).
2. Massive crustal carbon mobilization and emission driven by India underthrusting Asia. Communications Earth & Environment (2024).
3. Linking deeply-sourced volatile emissions to plateau growth dynamics in southeastern Tibetan Plateau. Nature Communications (2021).
4. Deep carbon recycling viewed from global plate tectonics. National Science Review (2024).
5. Radiocesium interaction with clay minerals: Theory and simulation advances Post–Fukushima. Journal of Environmental Radioactivity (2018).
6. Caesium incorporation and retention in illite interlayers. Applied Clay Science (2015).