On homogeneity of the Yamato-75110 chondrite

• Main Authors: Matsumoto, Yukio, Hayashi, Masao, Daishi, Masahiro, Miura, Yasunori
• Language: English
• Published: 1981
• Subjects: Cleary; Yamato; Memoirs of National Institute of Polar Research; Polar Research
• Online Access: https://nipr.repo.nii.ac.jp/record/1207/files/KJ00000011733.pdf

P(論文) The Yamato-75108 to -75257 chondrites are considered to be originally one meteorite which was broken into many fragments (MATSUMOTO : Mem. Natl Inst. Polar Res., Spec. Issue, 8,38,1978; MATSUMOTO et al. : Ibid., 12,72,1979; MATSUMOTO and HAYASHI : Ibid., 17,21,1980). Electron microprobe analyses have been made on olivine and orthopyroxene, and microscopic studies on four different portions (such as Nos. 90,91,93 and 95) of the Yamato-75110 chondrite. Textural characters of chondrules, matrix, igneous glass and secondary feldspar, and the mean composition, mean deviation, and percent mean deviation of the iron contents of olivines and orthopyroxenes are given. The value of % M.D. for the olivine in the Yamato-75110 chondrite ranges from 2.02 to 2.98; but that in the matrix is from 1.79 to 2.12,and that in chondrule is from 0.88 to 2.05. The value of % M.D. for the orthopyroxene in this chondrite ranges from 2.38 to 5.27; but that in the matrix is from 2.15 to 7.17,and that in the chondrule is from 2.12 to 4.43. Such a chemical variety of the Yamato-75110 chondrite is observed cleary in this study. However, this chondrite is classified as L group and petrologic type 4-5. departmental bulletin paper