Back to Search Start Over

53Mn-53Cr dating of fayalite formation in the CV3 chondrite Mokoia: evidence for asteroidal alteration.

53Mn-53Cr dating of fayalite formation in the CV3 chondrite Mokoia: evidence for asteroidal alteration.

Authors :
Hutcheon ID
Krot AN
Keil K
Phinney DL
Scott ER
Source :
Science (New York, N.Y.) [Science] 1998 Dec 04; Vol. 282 (5395), pp. 1865-7.
Publication Year :
1998

Abstract

Fayalite grains in chondrules in the oxidized, aqueously altered CV3 chondrite Mokoia have large excesses of radiogenic chromium-53. These excesses indicate the in situ decay of short-lived manganese-53 (half-life = 3.7 million years) and define an initial 53Mn/55Mn ratio of 2.32 (+/-0.18) x 10(-6). This ratio is comparable to values for carbonates in CI and CM chondrites and for several classes of differentiated meteorites. Mokoia fayalites formed 7 to 16 million years after Allende calcium-aluminum-rich inclusions, during hydrothermal activity on a geologically active asteroid after chondritic components had ceased forming in the solar nebula.

Details

Language :
English
ISSN :
0036-8075
Volume :
282
Issue :
5395
Database :
MEDLINE
Journal :
Science (New York, N.Y.)
Publication Type :
Academic Journal
Accession number :
9836631
Full Text :
https://doi.org/10.1126/science.282.5395.1865