Consortium reports of lunar meteorite Yamato-793274

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概要

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• Yamato (Y)-793274 is a fragmental breccia with some regolith components and is rich in pyroxene fragments. Chemical variation of pyroxenes in Y-793274 can be interpreted in terms of chemical zoning similar to those found in a rare basaltic clast in Apollo 16 breccia, 60019. Some pyroxene fragments show thin exsolution lamellae. The most magnesian gabbroic clast found consists of nearly homogeneous olivine, plagioclase, and pigeonite with fine exsolution. Plagioclase fragments show much wider variation in An contents than other lunar meteorites. All these data indicate that Y-793274 is a regolith breccia with components suggestive of mare origin (or non-highland). The mare components are not always surficial basalts, and may be a coarse-grained rock similar to the basaltic clast with chemically zoned pyroxenes in 60019,which is different from the mare basalt samples collected by the Apollo missions.

• 国立極地研究所の論文

著者

• KOJIMA Hideyasu

  National Institute of Polar Research

• Takeda Hiroshi

  Mineralogical Institute, University of Tokyo

• Yanai Keizo

  National Institute of Polar Research

• Yanai K

  Iwate Univ. Morioka

• Kojima Hideyasu

  Department Of Meteorites National Institute Of Polar Research

• Saito Jun

  Mineralogical Institute, Faculty of Science, University of Tokyo

• Takeda Hiroshi

  Mineralogical Institute Faculty Of Science University Of Tokyo

• Saito Jun

  Mineralogical Institute Faculty Of Science University Of Tokyo

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