Geochronology and Mineralization of Metamorphic Terranes
Summary
Metamorphic terranes represent crustal regions that have undergone significant transformations under elevated pressures and temperatures, often hosting economically significant ore systems. Geochronology in these settings employs a suite of radiometric techniques, chiefly U–Pb zircon dating, to constrain the timing of protolith deposition, metamorphic recrystallisation and subsequent deformation phases. Such temporal frameworks are essential to unravel the complex history of mineralising events, which are typically syn- to post-metamorphic. Mineralisation within metamorphic terranes commonly involves the mobilisation and deposition of metals through metamorphic fluids and hydrothermal systems that exploit structural fabrics such as foliation, shear zones and fractures. Skarn and volcanogenic massive sulphide systems illustrate how prograde and retrograde metamorphic processes can enhance or remobilise pre-existing ore bodies, yielding textures ranging from primary stratiform lenses to deformed ‘ball ore’ aggregates. Recent advances integrate in situ isotopic measurements, high-resolution geochronology and geochemical proxies to link ore formation to regional tectonothermal pulses. This synergy of chronological control and petrological context underpins exploration strategies aimed at targeting hidden mineralisation in deeply eroded or overprinted terranes, thereby addressing global demands for critical raw materials.
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Geochronology and Mineralization of Metamorphic Terranes publication trend
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Technical terms
Metamorphic terrane: A region of crust characterised by rocks altered by heat and pressure, often hosting ore deposits.
U–Pb zircon dating: A radiometric method that uses the decay of uranium to lead in zircon crystals to determine geological ages.
Skarn: A metamorphic rock formed at the contact between carbonate rocks and igneous intrusions, often enriched in metals.
Polyphase deformation: Multiple episodes of stress and strain that produce distinct structural fabrics in rocks.
Hydrothermal alteration: Chemical alteration of minerals by hot aqueous fluids in Earth’s crust.
Retrograde metamorphism: Mineralogical changes during cooling and decompression following peak metamorphic conditions.
References
- Ore Remobilization History of the Metamorphosed Rävliden North Volcanogenic Massive Sulfide Deposit, Skellefte District, Sweden. Economic Geology (2024).
- Stable (Zn, Cd, Fe) and radiogenic (U, Pb) metal isotope constraints on the age, genesis and modification of the Lovisa Zn-Pb sulfide deposit, Bergslagen, Sweden. Mineralium Deposita (2025).
- Origin of Palaeoproterozoic, sub-seafloor Zn-Pb-Ag skarn deposits, Sala area, Bergslagen, Sweden. Mineralium Deposita (2021).
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