Abstract
More than 300 small chondrules (50-200 μm) were found in the Sayh al Uhaymir (SaU) 290 CH3 chondrite which is a solar wind noble gas bearing meteorite and shows a brecciated texture. We analyzed noble gases in the individual chondrules using a laser ablation noble gas extraction system which enables to reduce blank noble gases. Isotopic ratios of He and Ne show no clear evidence of solar wind exposure, suggesting that the chondrules have not been exposed to solar winds. A chondrule shows an excess of cosmogenic 3He relative to other chondrules, which is explained by cosmic-ray exposure on the parent body. The derived parent exposure age is longer than 2.0 Ma, while the space exposure age is estimated as 1.4 Ma.
