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Ar-Ar Impact Heating Ages of Eucrites and Timing of the LHBEucrites and howardites, more than most meteorite types, show extensive impact resetting of their Ar-39-Ar-40 (K-Ar) ages approximately equal to 3.4-4.1 Ga ago, and many specimens show some disturbance of other radiometry chronometers as well. Bogard (1995) argued that this age resetting occurred on Vesta and was produced by the same general population of objects that produced many of the lunar impact basins. The exact nature of the lunar late heavy bombardment (LHB or 'cataclysm') remains controversial, but the timing is similar to the reset ages of eucrites. Neither the beginning nor ending time of the lunar LHB is well constrained. Comparison of Ar-Ar ages of brecciated eucrites with data for the lunar LHB can resolve both the origin of these impactors and the time period over which they were delivered to the inner solar system. This abstract reports some new Ar-Ar age data for eucrites, obtained since the authors' 1995 and 2003 papers.
Document ID
20090006927
Acquisition Source
Johnson Space Center
Document Type
Extended Abstract
Authors
Bogard, Donald (NASA Johnson Space Center Houston, TX, United States)
Garrison, Daniel (Barrios Technology, Inc. Houston, TX, United States)
Date Acquired
August 24, 2013
Publication Date
January 1, 2009
Subject Category
Lunar And Planetary Science And Exploration
Report/Patent Number
JSC-17610
Meeting Information
Meeting: 40th Lunar Planetary Science Conference
Location: Houston, TX
Country: United States
Start Date: March 23, 2009
End Date: March 27, 2009
Sponsors: Lunar and Planetary Inst.
Distribution Limits
Public
Copyright
Public Use Permitted.

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