Portal de Periódicos da CAPES

Comet or Asteroid Shower in the Late Eocene?

2004; American Association for the Advancement of Science; Volume: 305; Issue: 5683 Linguagem: Inglês

10.1126/science.1098481

1095-9203

Roald Tagle, Philippe Claeys,

Planetary Science and Exploration

The passage of a comet shower approximately 35 million years ago is generally advocated to explain the coincidence during Earth's late Eocene of an unusually high flux of interplanetary dust particles and the formation of the two largest craters in the Cenozoic, Popigai and the Chesapeake Bay. However, new platinum-group element analyses indicate that Popigai was formed by the impact of an L-chondrite meteorite. Such an asteroidal projectile is difficult to reconcile with a cometary origin. Perhaps instead the higher delivery rate of extraterrestrial matter, dust, and large objects was caused by a major collision in the asteroid belt.