Ar-40/Ar-39 dating of collisional events in chondrite parent bodies

Details Ar-40/Ar-39 dating of collisional events in chondrite parent bodies Ar-40/Ar-39 dating of collisional events in chondrite parent bodies

Nov 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.5664b&link_type=abstract

Journal of Geophysical Research, vol. 81, Nov. 10, 1976, p. 5664-5678.

Physics

22

Argon Isotopes, Chondrites, Degassing, Particle Collisions, Shock Heating, Abundance, Age Factor, Exposure, Gaseous Diffusion, Meteoritic Composition, Temperature Effects

Scientific paper

Ar-40/Ar-39 age dating of a number of shocked ordinary chondrites is interpreted in terms of collisional degassing events of meteorite parent bodies, probably in the asteroid belt. Examples of L, H, and at least one LL chondrite show episodic degassing. Degassing ages suggest several distinct events ranging from about 0.03 aeon to 0.7 aeon and probably higher. All specimens of either the H or L chondrites are not consistent with a single age event. A direct correlation exists between the degree of shock heating and the fraction of argon lost during degassing. However, no chondrite yet analyzed shows complete degassing of its high-temperature phase. Consequently, whole rock K-Ar ages are not accurate monitors of the time of the shock event.

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