Mars-Earth transfer time of lherzolite Yamato-793605

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概要

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• We determined the cosmic-ray exposure age of Yamato-793605 based on cosmic-ray produced ^3He, ^<21>Ne, and ^<38>Ar. The average age is 4.4±1.0 Ma and agrees with the exposure ages of the two other martian lherzolites ALH77005 and LEW88516. The similarity in petrology, chemistry, oxygen isotopic composition, and cosmic-ray exposure history shows that the three lherzolitic martian meteorites originate from the same parent magma and were ejected from Mars by the same ejection event. The basaltic shergottites EET79001,QUE94201,Shergotty, and Zagami strongly differ from the three lherzolites in mineralogical and chemical composition and were ejected by events that occurred 1 Ma and 3 Ma (EET79001) later than that responsible for the delivery of the lherzolites. We propose that these differences are sufficiently important to merit distinct meteorite classification and to name ALH77005,LEW88516,and Y-793605 "lherzolites", in contrast to the "shergottites" EET79001,QUE94201,Shergotty, and Zagami.

• 国立極地研究所の論文

著者

• Eugster Otto

  Physikalisches Institut University Of Bern

• Polnau Ernst

  Physikalisches Institut, University of Bern

• Polnau Ernst

  Physikalisches Institut University Of Bern

関連論文

• Mars ejection times and neutron capture effects of the nakhlites Y000593 and Y000749, the olivine-phyric shergottite Y980459, and the lherzolite NWA1950
• Preliminary report on the Yamato-86032 lunar meteorite: III. Ages, noble gas isotopes, oxygen isotopes and chemical abundances
• Mars-Earth transfer time of lherzolite Yamato-793605
• Noble gases, chemical composition, and cosmic-ray exposure age of the Yamato-74357 lodranite

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