@article{oai:nipr.repo.nii.ac.jp:00010138,
 author = {Ishida, Hatsumi and Nakamura, Tomoki and Miura, Hitoshi and Kakazu, Yuki and Ishida, Hatsumi and Nakamura, Tomoki and Miura, Hitoshi and Kakazu, Yuki},
 issue = {3},
 journal = {Polar science, Polar science},
 month = {Aug},
 note = {We describe the petrography and mineralogy of six CV3 carbonaceous chondrites. LAP02206, LAP02228, LAP04843, and GRA06101 are classified as oxidized Allende-like chondrites (CV3oxA). RBT04143 and QUE97186 are classified as members of the reduced subtype (CV3red). Chondrules in the CV3oxA chondrites show extensive Fe–Mg zoning. Fe-rich olivine in the rims of the CV3oxA chondrules are 16O-poor relative to Mg-rich olivine in the cores, suggesting that in addition to Fe and Mg, oxygen was exchanged between chondrules and matrix during weak thermal metamorphism. The CV3red chondrites appear to have formed through various processes. QUE97186 shows chondrule flattening with a preferred orientation, which is interpreted to have resulted from shock impact at a pressure of ∼20 GPa. The post-shock residual heat (∼1000 °C) is likely to be responsible for the restricted Fe/Mg ratios of matrix olivine. Based on the degree of Fe–Mg homogenization of matrix olivines, we estimate the spatial scale of the shock-heated region to be ∼1 m. RBT04143 is a breccia containing many clasts of two types of lithologies: reduced-type material and very weakly altered material., 南極で回収されたCV3炭素質コンドライト6試料（RBT04143, QUE97186, LAP02206, LAP02228, LAP04843, GRA06101）に対し、岩石鉱物学的、化学的研究を行った。組織観察や鉱物組み合わせの結果より、6試料中4試料（LAP02206, LAP02228, LAP04843, GRA06101）がCVoxA、残りの2試料（RBT04143, QUE97186）がCVredに分類された。CVredに分類された2試料のうち、QUE97186は母天体上で20GPa程度の衝撃圧を経験していると考えられる。また、QUE97186のマトリックスのFa#の均質化が衝撃加熱によるものと仮定し、母天体上における衝撃過程による熱履歴を調べた結果、QUE97186母天体の加熱領域はおよそ1m程度であることが見積もられた。このことから、QUE97186母天体形成領域における天体衝突イベントは、局所的なスケールであったと考えられる。},
 pages = {252--262},
 title = {Diverse mineralogical and oxygen isotopic signatures recorded in CV3 carbonaceous chondrites},
 volume = {6},
 year = {2012}
}