Publication Date:
2004-07-27
Description:
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.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tagle, Roald -- Claeys, Philippe -- New York, N.Y. -- Science. 2004 Jul 23;305(5683):492.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institut fuer Mineralogie, Museum fuer Naturkunde, D-10099 Berlin, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15273387" target="_blank"〉PubMed〈/a〉
Keywords:
*Earth (Planet)
;
Elements
;
Geologic Sediments/chemistry
;
*Meteoroids
;
*Minor Planets
;
Time
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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