|
|||||
|
|
Oxygen isotopic compositions of asteroidal materials returned from Itokawa by the Hayabusa mission |
|
| Authors: | Yurimoto Hisayoshi Abe Ken-ichi Abe Masanao Ebihara Mitsuru Fujimura Akio Hashiguchi Minako Hashizume Ko Ireland Trevor R Itoh Shoichi Katayama Juri Kato Chizu Kawaguchi Junichiro Kawasaki Noriyuki Kitajima Fumio Kobayashi Sachio Meike Tatsuji Mukai Toshifumi Nagao Keisuke Nakamura Tomoki Naraoka Hiroshi Noguchi Takaaki Okazaki Ryuji Park Changkun Sakamoto Naoya Seto Yusuke Takei Masashi Tsuchiyama Akira Uesugi Masayuki Wakaki Shigeyuki Yada Toru Yamamoto Kosuke Yoshikawa Makoto Zolensky Michael E |
| Institution: | Natural History Sciences, Hokkaido University, Sapporo 060-0810, Japan. yuri@ep.sci.hokudai.ac.jp |
| Abstract: | Meteorite studies suggest that each solar system object has a unique oxygen isotopic composition. Chondrites, the most primitive of meteorites, have been believed to be derived from asteroids, but oxygen isotopic compositions of asteroids themselves have not been established. We measured, using secondary ion mass spectrometry, oxygen isotopic compositions of rock particles from asteroid 25143 Itokawa returned by the Hayabusa spacecraft. Compositions of the particles are depleted in (16)O relative to terrestrial materials and indicate that Itokawa, an S-type asteroid, is one of the sources of the LL or L group of equilibrated ordinary chondrites. This is a direct oxygen-isotope link between chondrites and their parent asteroid. |
| Keywords: | |
| 本文献已被 PubMed 等数据库收录！ | |