Geochemical and Isotopic Studies of Archean Crustal Evolution
Summary
The Archean crust represents Earth’s earliest continents, formed and modified between 4.0 and 2.5 billion years ago. Geochemical and isotopic studies have revolutionised our view of its assembly, differentiation and recycling. Major‐ and trace‐element analyses trace magma sources, from enriched mantle domains to reworked felsic reservoirs, while radiogenic isotope systems (Sm–Nd, Lu–Hf, U–Pb) record the timing and nature of crustal growth pulses. High‐precision U–Pb geochronology in zircon, coupled with hafnium isotopes, reveals protracted crust formation and repeated reworking rather than single‐stage accretion. Rare earth element (REE) patterns and high‐field‐strength element anomalies fingerprint subduction-like processes in the Neoarchean, whereas oxygen and lithium isotopes constrain fluid interactions and surface weathering. Integrating geochemical thermobarometry with isotopic data has refined models of early tectonic regimes, illuminating the shift from vertical, plume-driven processes to the onset of horizontal plate interactions and stabilisation of ancient cratonic nuclei.
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Geochemical and Isotopic Studies of Archean Crustal Evolution publication trend
The graph below shows the total number of articles in geochemical and isotopic studies of archean crustal evolution across all publications each year (not limited to Nature Index journals).
Technical terms
Archean: Geological eon from 4.0 to 2.5 billion years ago marking the formation of Earth’s earliest continental crust.
Craton: A stable, long-lived interior portion of continental lithosphere that preserves ancient crustal fragments.
U–Pb geochronology: Radiometric dating method that uses the decay of uranium to lead in zircon to determine crystallisation ages.
Rare earth elements (REE): A group of 15 lanthanide elements plus yttrium, used as tracers of magmatic processes due to coherent chemical behaviour.
Sanukitoid: A high-magnesium granitoid with enriched large-ion lithophile and light REE signatures derived from metasomatised mantle sources.
A2-type granite: Post-collisional granite characterised by negative high-field-strength element anomalies and fractionated REE patterns signalling crust–mantle interaction.
References
- Petrogenesis of the Kanker Granites From the Bastar Craton: Implications for Crustal Growth and Evolution During the Archean-Proterozoic Transition. Frontiers in Earth Science (2020).
- A2-Type Granites from the Bastar Craton, South-Central India, and Their Implication in Archean-Paleoproterozoic Tectonics in Indian Peninsula. Lithosphere (2022).
- Geochemical evolution of basaltic flows from Dongargarh Supergroup, Bastar Craton, Central India. IOP Conference Series Earth and Environmental Science (2022).
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