The parent bodies of Ryugu and Ivuna formed before those of other carbonaceous chondrites
Joint press release (in Japanese) by Hokkaido University, Ibaraki University, Japan Agency for Marine-Earth Science and Technology, Institute of Science Tokyo and The University of Tokyo
Abstract
Most carbonaceous chondrite (CC) meteorites contain abundant chondrules, millimeter-scale spherical inclusions of previously molten material. Ivuna-type carbonaceous chondrites (CIs) do not contain chondrules, nor do samples of the carbonaceous asteroid Ryugu. CIs and Ryugu share isotopic properties distinct from those of other CCs, implying that their parent bodies formed at a different time or place than those of other CCs. We applied manganese-chromium dating and oxygen isotope thermometry to Ryugu and Ivuna samples. The results indicate ….
Read more on Science
Article Information:
Noriyuki Kawasaki, Kazuhide Nagashima, Naoya Sakamoto, Wataru Fujiya, Sota Arakawa , Ken-ichi Bajo , Noriko T. Kita, Kouki Kitajima, Alexander N. Krot, […] , and Hisayoshi Yurimoto（+73 authors）, Science, 393, 6816, 1117-1121, 2026
DOI：10.1126/science.adw4498
