Geological and geochemical record of 3400-million-year-old terrestrial meteorite impacts.

@article{Lowe1989GeologicalAG,
  title={Geological and geochemical record of 3400-million-year-old terrestrial meteorite impacts.},
  author={Donald Ray Lowe and Gary R. Byerly and Frank Asaro and F J Kyte},
  journal={Science},
  year={1989},
  volume={245 4921},
  pages={
          959-62
        }
}
Beds of sand-sized spherules in the 3400-million-year-old Fig Tree Group, Barberton Greenstone belt, South Africa, formed by the fall of quenched liquid silicate droplets into a range of shallow-to deep-water depositional environments. The regional extent of the layers, their compositional complexity, and lack of included volcanic debris suggest that they are not products of volcanic activity. The layers are greatly enriched in iridium and other platinum group elements in roughly chondritic… CONTINUE READING
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