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Noble gas signature of the late heavy bombardment in the Earth's atmosphere
1Centre de Recherches Pétrographiques et Géochimiques and Ecole Nationale Supérieure de Géologie, Nancy Universités, Nancy, France
2Muséum National d'Histoire Naturelle, Paris, France
Abstract. The Lunar cratering record is consistent with the occurrence of a late heavy bombardment (LHB), which marked the end of terrestrial planet accretion 3.8 billion years ago. However, clear evidence of a LHB on Earth has not yet been identified. Here it is shown that the LHB did indeed occur on Earth and that we are breathing its aftermaths. The terrestrial atmosphere and hydrosphere is enriched in noble gases relative to the abundance of volatiles in the mantle. This enrichment is consistent with the mass delivered to Earth during the LHB only if this material consisted of ~0.5% Kuiper-belt objects mixed in with a population of largely chondritic (i.e. asteroidal) impactors. This places strong constraints on dynamical models for early Solar System evolution.
Discussion Paper (PDF, 538 KB) Interactive Discussion (Closed, 3 Comments) Final Revised Paper (eE)
Citation: Marty, B. and Meibom, A.: Noble gas signature of the late heavy bombardment in the Earth's atmosphere, eEarth Discuss., 2, 99-113, 2007. Bibtex EndNote Reference Manager
