Geochronology of Proterozoic Crustal Development
Summary
The geochronology of Proterozoic crustal development employs high-precision isotopic methods to unravel the timing, duration and tempo of crust formation, modification and assembly between 2.5 and 1.0 billion years ago. Central techniques include uranium–lead (U–Pb) dating of accessory minerals such as zircon and monazite, Re-Os geochronology for sulphide minerals and Lu–Hf isotope analyses for crust–mantle evolution. These approaches yield absolute ages for magmatic crystallisation, metamorphic overprints and metasomatic events, and provide isotope-ratio fingerprints that distinguish juvenile mantle input from the reworking of older crust. Combined with field mapping, geochemical profiling and structural analysis, geochronological data underpin models of craton formation, supercontinent assembly, rift initiation and mountain-building orogenies. Insights into Proterozoic crustal dynamics have global significance for reconstructing past plate configurations, assessing mineral resource potential and understanding the thermal and chemical evolution of Earth’s lithosphere.
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Geochronology of Proterozoic Crustal Development publication trend
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Technical terms
U–Pb dating: A radiometric method measuring the decay of uranium to lead in minerals to determine crystallisation and metamorphic ages.
Detrital zircon: Zircon grains preserved in sedimentary rocks that record age spectra of source terrains.
εHf: A notation for the deviation in hafnium isotopic composition from a chondritic uniform reservoir, indicating crust–mantle contributions.
Metasomatism: The chemical alteration of rocks by externally derived fluids, leading to mineralogical and compositional changes.
Craton: A stable, ancient block of continental lithosphere that forms the core of continents.
Orogeny: A mountain-building event resulting from tectonic plate convergence and crustal deformation.
References
- Dating Metasomatism: Monazite and Zircon Growth during Amphibolite Facies Albitization. Minerals (2018).
- The Medicine Hat Block and the Early Paleoproterozoic Assembly of Western Laurentia. Geosciences (2020).
- Recently Identified Mesoproterozoic Strata in South‐Central Idaho Document Late‐Stage Rifting of the Nuna Supercontinent in Western Laurentia. Geochemistry Geophysics Geosystems (2024).
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