Noble gases in enstatite chondrites I: Exposure ages, pairing, and weathering effects

Details Noble gases in enstatite chondrites I: Exposure ages, pairing, and weathering effects Noble gases in enstatite chondrites I: Exposure ages, pairing, and weathering effects

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001m%26ps...36..947p&link_type=abstract

Meteoritics & Planetary Science, vol. 36, no. 6, p. 947-961

Computer Science

23

Scientific paper

Cosmic ray exposure ages (CREAs) calculated from cosmogenic noble gas nuclides are reported for 57 enstatite chondrites (E-chondrites), 43 of them were measured for the first time. With a total of 62 individual E-chondrites (literature and this data, corrected for pairing) the observed spectrum of ages ranges between 0.07 and 66 Ma. Three clusters seem to develop at about 3.5, 8, and 25 Ma, respectively. Since the uncertainty of ages is estimated to be about 20 % (in contrast to 10 to 15 % for ordinary chondrites) and the number of examined samples is still comparatively small these peaks have to be confirmed by more measurements. Regarding the two subgroups, EH- and EL-chondrites, no systematic trend is apparent in the distribution of CREAs. Several E-chondrites yield significantly lower 38Ar-ages compared to those calculated from cosmogenic 3He and 21Ne. For these E-chondrites, we suggest a reduction of cosmogenic 38Ar as a result of weathering. In order to prove the possible influence of terrestrial alteration on the cosmogenic noble gas record of E-chondritic material we simulated terrestrial weathering in an experiment of 12 weeks duration. The treatment showed that a significant amount of cosmogenic 38Ar is lost on Earth by the influence of water.

Affiliated with

Also associated with

No associations

Rating

Noble gases in enstatite chondrites I: Exposure ages, pairing, and weathering effects 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 Noble gases in enstatite chondrites I: Exposure ages, pairing, and weathering effects, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Noble gases in enstatite chondrites I: Exposure ages, pairing, and weathering effects will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1201958