TERRAPUB Earth, Planets and Space

Earth Planets Space, Vol. 57 (No. 9), pp. e13-e16, 2005


Widespread magmatic activities on the angrite parent body at 4562 Ma ago

Naoji Sugiura1, Akiko Miyazaki1, and Keizo Yanai2

1Department of Earth and Planetary Science, University of Tokyo, Japan
2Department of Civil and Environmental Engineering, Iwate University, Japan

(Received May 18, 2005; Revised July 26, 2005; Accepted July 27, 2005)

Abstract: Mn-Cr chronology of four quenched angrites showed that they formed nearly at the same time (4562 Ma) on the surface of the parent-body. Based on the chemical compositions, the cosmic ray exposure ages, and considerations on the thermal history of an achondrite parent-body, we suggest that the four angrites formed on top of a shallow magma ocean on the angrite parent body.
Key words: Age, angrites, Mn-Cr dating, SIMS.

Corresponding author E-mail: sugiura@eps.s.u-tokyo.ac.jp

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