期刊
EARTH AND PLANETARY SCIENCE LETTERS
卷 295, 期 1-2, 页码 321-327出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.epsl.2010.04.023
关键词
FIB; Olivine; Ringwoodite; Shocked chondrite; TEM
资金
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [18654091, 18104009, 19540500]
- Scientific Research of Priority Area [16075202]
- Grants-in-Aid for Scientific Research [22540488, 19540500, 18654091] Funding Source: KAKEN
Pervasive replacement of original olivine grains by ringwoodite adjacent to a shock-melt vein of Yamato 791384 L6 chondrite was observed with a FEG-SEM. In these olivines, we observed three distinct olivine-ringwoodite textures arranged in a spatially successive arrangement from the wall of the shock-melt vein into the olivine grains: (1) polycrystalline ringwoodite, (2) oriented several sets of ringwoodite lamellae and (3) oriented single lamellae. TEM images show that the polycrystalline and oriented several sets of lamellae parts consist of polycrystalline ringwoodite, indicating that phase transformation from olivine to ringwoodite is controlled by incoherent growth mechanism. On the other hand, the set of oriented single lamellae consists of thin ringwoodite platelets (
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