40Ar/39Ar ages of impacts involving ordinary chondrite meteorites

Timothy Swindle, D. A. Kring, J. R. Weirich

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

Impact ages have now been determined for c. 100 ordinary chondrites, providing information about impacts in the asteroid belt throughout the history of the Solar System. Most notably, there is evidence for (a) impact events in the first 100 Ma of Solar System history, during the accretion of material; (b) an increase in impact ages produced between 3500 and 4100 Ma, presumably related to the suspected 'lunar cataclysm'; (c) many L chondrites being degassed during the disruption of their parent body slightly less than 500 Ma ago; and (d) at least one younger event in the H chondrites. There are no 40Ar/39Ar ages that clearly match the cosmic ray exposure ages of any meteorites, which means that the collisions that liberated the fragments we now have as meteorites did not produce time-temperature histories capable of degassing radiogenic 40Ar. Since there is no way to know a priori whether an ordinary chondrite impact melt is the result of a recent or ancient event, much of the progress will continue to come from reconnaissance studies of shocked ordinary chondrites.

Original languageEnglish (US)
Pages (from-to)333-347
Number of pages15
JournalGeological Society Special Publication
Volume378
Issue number1
DOIs
StatePublished - 2013

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Meteorites
ordinary chondrite
Solar system
meteorite
Asteroids
Cosmic rays
Degassing
chondrite
solar system
history
parent body
degassing
asteroid
cosmic ray
collision
accretion
melt
Temperature
temperature

ASJC Scopus subject areas

  • Ocean Engineering
  • Water Science and Technology
  • Geology

Cite this

40Ar/39Ar ages of impacts involving ordinary chondrite meteorites. / Swindle, Timothy; Kring, D. A.; Weirich, J. R.

In: Geological Society Special Publication, Vol. 378, No. 1, 2013, p. 333-347.

Research output: Contribution to journalArticle

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