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A Miocene impact ejecta layer in the pelagic Pacific Ocean.

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Scientists discovered evidence of an extraterrestrial impact event approximately 11 million years ago in the Northwest Pacific. This finding suggests an unrecognized meteorite impact created a unique ejecta layer in deep-sea sediment.

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Area of Science:

  • Geochemistry
  • Planetary Science
  • Paleontology

Background:

  • Meteorite impacts are significant drivers of global environmental change and mass extinctions.
  • Deep-sea sediments can preserve evidence of extraterrestrial events.

Purpose of the Study:

  • To investigate a clay layer in the Northwest Pacific for evidence of a meteorite impact.
  • To determine the age and origin of the observed geological anomaly.

Main Methods:

  • Petrographic analysis of sediment samples.
  • Geochemical analysis, including platinum group element (PGE) concentrations and Osmium isotope ratios.
  • Osmium isotope stratigraphy to determine depositional age.

Main Results:

  • A clay layer dated to approximately 11 million years ago (Miocene) was identified in the Northwest Pacific.
  • The layer exhibits high PGE concentrations and a significant negative Os isotope anomaly, indicative of extraterrestrial material.
  • Spherules with mineral compositions (spinel, olivine pseudomorphs) consistent with impact ejecta were found.

Conclusions:

  • The evidence strongly suggests the presence of an impact ejecta layer from an unrecognized meteorite impact event.
  • The impact likely occurred in the middle to late Miocene, with the ejecta deposited in the Northwest Pacific.
  • The lack of a known contemporaneous impact crater highlights the potential for discovering new impact sites through deep-sea exploration.