Geochronology and Tectonic Evolution of Gondwana Terranes

The assembly and fragmentation of Gondwana was governed by a complex interplay of crustal rifting, magmatic activity, sedimentation and collisional orogeny. Modern geochronological techniques, notably high-precision uranium–lead dating of accessory minerals such as zircon, have established robust age constraints on key episodes spanning the Tonian rift initiation (~900–800 Ma), Cryogenian glaciations (717–635 Ma) and final Neoproterozoic–Cambrian orogenic collisions (630–520 Ma). These data, integrated with stratigraphic, structural and geochemical evidence, have illuminated the life cycle of individual terranes—from the opening of narrow rift basins that accommodated subsidence and syn-rift volcanism, through the development of passive continental margins, to the onset of subduction-related magmatism and ultimate closure of intervening oceanic domains. In South America, Africa, Antarctica, India and Australia, U–Pb zircon ages record multiple pulses of arc and post-collisional magmatism that correspond to discrete orogenic events. For example, the progressive closure of the Charrua, Adamastor and Mozambique oceans is reflected in successive granitoid intrusions and high-pressure metamorphism in belts such as the Dom Feliciano, Araçuaí–Ribeira and Damara–Kaoko systems. Strike-slip shear zones and late extensional basins attest to tectonic escape and collapse following peak crustal thickening. Together, these results underpin refined palaeogeographic reconstructions of Gondwana, revealing that terrane fragments once adjacent to the Kalahari, Rio de la Plata and Congo cratons migrated hundreds of kilometres before final amalgamation. The global significance of this work extends to mineral exploration—where the timing of magmatic and metamorphic events controls ore deposition—and to palaeoclimate studies that link supercontinent configuration with episodes of extreme glaciation and greenhouse warming.

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Geochronology and Tectonic Evolution of Gondwana Terranes publication trend

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Technical terms

Geochronology: The science of determining the age and temporal sequence of geological events using radiometric or other age-dating methods.

U–Pb zircon dating: A radiometric technique that measures the ratio of uranium to lead isotopes within zircon crystals to establish precise crystallisation ages.

Craton: A long-lived, stable block of continental lithosphere that has survived cycles of deformation and metamorphism.

Rift basin: A linear zone of crustal extension where the lithosphere has been stretched and thinned, often hosting syn-rift sedimentary and volcanic deposits.

Orogeny: A mountain-building event produced by tectonic plate convergence, subduction or collision, typically involving deformation, metamorphism and magmatism.

Terrane: A fault-bounded crustal block with its own distinct geological history, which can be accreted to larger continental masses during supercontinent assembly.

References

1. Tonian basins record rifting of Kalahari from Rodinia and no evidence of a pre-Sturtian Kaigas glaciation. Earth and Planetary Science Letters (2023).
2. Adamastor – an ocean that never existed?. Earth-Science Reviews (2020).
3. Tectonic evolution of the Dom Feliciano Belt in Southern Brazil: Geological relationships and U-Pb geochronology. Brazilian Journal of Geology (2016).