Computer Science
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001m%26ps...36..429c&link_type=abstract
Meteoritics & Planetary Science, vol. 36, no. 3, p. 429-437
Computer Science
4
Scientific paper
The cosmogenic radionuclides, 10Be, 26Al, 36Cl, and 53Mn were measured in selected clasts and matrix samples from the howardite Kapoeta. Previous measurements of cosmogenic 21Ne indicate higher cosmic ray exposure ages for bulk samples than for some separated clasts or mineral separates. A possible interpretation for this difference in apparent exposure ages is a complex recent exposure history for Kapoeta. In this scenario some constituents are exposed to cosmic rays in a 2p geometry as part of a larger body immediately preceding it's 4p exposure in a smaller body. To test this scenario we measured cosmogenic radionuclides in several clasts from Kapoeta. These measurements are consistent with a simple single-stage 4p exposure history during which the entire inventory of cosmogenic radionuclides was produced. Taken together, these data are most consistent with a single stage 4p exposure lasting ~ 3 Myr. This scenario is nevertheless consistent with models in which the exposure of some constituents of Kapoeta to energetic particles occurred at an earlier time, as is indicated by 21Ne measurements. However, from our data we conclude that insubstantial quantities of cosmogenic radionuclides were inherited from this earlier irradiation; this earlier exposure to energetic particles must have pre-dated the recent exposure by at least ~ 10 Myr to allow for the decay of the long half-life cosmogenic radionuclides.
Caffee Marc W.
Nishiizumi Kunihiko
No associations
LandOfFree
Exposure history of separated phases from the Kapoeta meteorite does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Exposure history of separated phases from the Kapoeta meteorite, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Exposure history of separated phases from the Kapoeta meteorite will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1090628