Oxygen isotope study of Tsukuba chondrite, some HED meteorites and Allende chondrules

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概要

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• Laser fluorination technique coupled with stable isotope mass spectrometry using O_2 is successfully employed to determine the δ^<17>O and δ^<18>O values of different types of meteorites. The oxygen isotope data are reported for the recent fall Tsukuba meteorite confirming it to be an H-type ordinary chondrite. Three diogenites Tatahouine, Y-791199 and Y-791000 are analyzed for oxygen isotopic signatures. Y-791199 and Y-791000 are regarded as cumulate eucrites by many researchers on the basis of petrogenesis. The oxygen isotopes of Tatahouine and Y-791199 are consistent with the diogenite group data. Y-791000 is showing lighter oxygen isotopic composition which is unique among the other diogenites. It may indicate that the parental source for some of cumulate eucrites is different from the non-cumulate ones. The slope 1/2 trend of oxygen isotopes observed in various Allende chondrules (mostly small porphyritic type) signifies that aqueous alteration might be responsible for scattering of data along a nearly mass dependant trend. These chondrules are plotted on a δ^<17>O-δ^<18>O diagram with a slope of 0.52 having Δ^<17>O=-4.24±0.27. The range of δ^<18>O and δ^<17>O data observed in these chondrules is from -7.26 to -0.19‰ and -7.98 to -4.04‰ respectively. The variability in the isotopic composition which caused the scatter on the terrestrial trend implies that on the parent body some low temperature hydrothermal alteration took place.

• 国立極地研究所の論文

著者

• NAKAMURA Tomoki

  Department of Earth and Planetary Sciences, Kyushu University

• Nagao Keisuke

  Institute for Study of Earth's Interior, Okayama University

• Nagao K

  Institute For Study Of The Earth's Interior Okayama University

• 中村 智樹

  Department Of Earth And Planetary Science Kyushu University

• Nakamura Tomoki

  Earth and Planetary Sciences, Graduate School of Science, Kyushu University

• Kusakabe Minoru

  Institute For Study Of The Earth's Interior Okayama University

• Nakamura Tomoki

  Department Of Earth And Planetary Sciences Faculty Of Sciences Kyushu University

• Nakamura Tomoki

  Department Of Earth And Planetary Sciences Graduate School Of Science Kyushu University

• Nakamura Tomoki

  Department Of Earth And Planetary Science Faculty Of Science Kyushu University

• JABEEN Iffat

  Institute for Study of the Earth's Interior, Okayama University

• Kusakabe M

  Okayama Univ. Tottori‐ken Jpn

• Nakamura Tomoki

  Department Of Earth And Planetary Sciences Graduate School Of Sciences Kyushu University

• Nakamura Tomoki

  Earth And Planetary Science Faculty Of Science Kyushu University

• Nakamura Tomoki

  Earth And Planetary Sciences Faculty Of Science Kyushu University

• Nagao Keisuke

  Institute For Study Of Earth's Interior Okayama University

• Kusakabe Minoru

  Institute For Study Of The Earth Interior Okayama University

• Jabeen I

  Okayama Univ. Tottori Jpn

• Jabeen Iffat

  Institute For Study Of The Earth's Interior Okayama University

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