Argon 40-argon 39 chronology of four calcium-rich achondrites

Details Argon 40-argon 39 chronology of four calcium-rich achondrites Argon 40-argon 39 chronology of four calcium-rich achondrites

Mar 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973gecoa..37..667p&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 37, Issue 3, pp.667-684

Computer Science

10

Scientific paper

Results are presented from thermal-release argon 40-argon 39 dating experiments on four calcium-rich achondrites. Pasamonte shows an apparent age of 4.1 AE over 70 per cent of its gas release indicating a degassing event at this age. At higher temperatures, the apparent age for Pasamonte rises to 4.51 AE, defining a lower limit gas retention age which is identical to that of the chondrites St. Severin and Guareña. Petersburg has a high-temperature gas retention age of 4.40 ± 0.03AE, 100 million years younger than St. Severin, in agreement with previously reported Pu-Xe and K-Ar gas retention ages and the absence of Xe 129 from the decay of I 129 . Stannern has a complicated pattern of apparent age with gas release which cannot be accounted for in detail by simple diffusive loss following a well-defined initiation of gas retention. In broad scale, however, the Stannern pattern is relatively flat and confined to the range 3.5-3.9 AE, indicating that this meteorite was strongly degassed in this interval. The nakhlite Lafayette has an exceedingly young gas-retention age in the range 1.4-1.7 AE. These results indicate that as a group the calcium-rich achondrites have experienced a more diverse and extensive thermal history than have the chondritic meteorites.

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