An Archaean heavy bombardment from a destabilized extension of the asteroid belt

@article{Bottke2012AnAH,
  title={An Archaean heavy bombardment from a destabilized extension of the asteroid belt},
  author={William F. Bottke and David Vokrouhlick{\'y} and David A. Minton and David Nesvorn{\'y} and Alessandro Morbidelli and Ramon Brasser and Bruce M. Simonson and Harold F. Levison},
  journal={Nature},
  year={2012},
  volume={485},
  pages={78-81}
}
The barrage of comets and asteroids that produced many young lunar basins (craters over 300 kilometres in diameter) has frequently been called the Late Heavy Bombardment (LHB). Many assume the LHB ended about 3.7 to 3.8 billion years (Gyr) ago with the formation of Orientale basin. Evidence for LHB-sized blasts on Earth, however, extend into the Archaean and early Proterozoic eons, in the form of impact spherule beds: globally distributed ejecta layers created by Chicxulub-sized or larger… 

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References

SHOWING 1-10 OF 35 REFERENCES

Origin of the cataclysmic Late Heavy Bombardment period of the terrestrial planets

This model not only naturally explains the Late Heavy Bombardment, but also reproduces the observational constraints of the outer Solar System.

A Younger Age for ALH84001 and Its Geochemical Link to Shergottite Sources in Mars

The calculated Lu/Hf and Sm/Nd (samarium/neodymium) ratios of the ALH parental magma source indicate that it must have undergone extensive igneous processing associated with the crystallization of a deep magma ocean, suggesting uniform igneous processes in Mars for nearly 4 billion years.

Impact spherules as a record of an ancient heavy bombardment of Earth

Estimates of the sizes and impact velocities of the asteroids that created global spherule layers reveal that the impactor flux was significantly higher 3.5 billion years ago than it is now, consistent with a gradual decline of theimpactor flux after the Late Heavy Bombardment.

Cataclysmic bombardment throughout the inner solar system 3.9–4.0 Ga

[1] Cohen et al. [2000] recently confirmed the hypothesis that the Moon was resurfaced by an intense period of impact cratering ∼3.9 Ga ago and, by inference, that the Earth also sustained

39Ar‐40Ar dating of the Zagami Martian shergottite and implications for magma origin of excess 40Ar

Abstract— The Zagami shergottite experienced a complex, petrogenetic formation history (McCoy et al. 1992, 1999). Like several shergottites, Zagami contains excess 40Ar relative to its formation age.

SPHERULE LAYERS—RECORDS OF ANCIENT IMPACTS

▪ Abstract A large extraterrestrial object striking Earth at cosmic velocity melts and vaporizes silicate materials, which can condense into highly spheroidal, sand-size particles that get deposited