Geology of the Eastern Barberton Greenstone Belt, South Africa: Early Deformation and the Role of Large Meteor Impacts

Research on the eastern Barberton Greenstone Belt (BGB) reveals that early deformation and uplift, marked by the Fig Tree Group's siliciclastic rocks, likely resulted from crustal disruption caused by large meteor impacts around 3.277–3.260 Ga. The study analyzes stratigraphic divisions—Mlumati, Manzimnyama, Paulus Synclines, and Emlembe Belt—composed primarily of banded iron formation (BIF) and chert, with contrasting sediment compositions and detrital zircon ages indicating distinct sediment sources and local basins rather than a unified depositional system. The thinness of Fig Tree strata and rapid facies changes suggest small-scale deformation, consistent with impact-induced crustal fragmentation. This challenges traditional views on the BGB's tectonic evolution, proposing that meteor impacts played a pivotal role in destabilizing early Earth's crust before later orogeny.

Lowe, D. R., & Byerly, G. R. (2024). Geology of the Eastern Barberton Greenstone Belt, South Africa: Early Deformation and the Role of Large Meteor Impacts. American Journal of Science, 324. https://doi.org/10.2475/001c.122938