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2次イオン質量分析計を用いたChelyabinsk隕石の局所U-Pb年代分析

(¹阪大院理・ ²広島大院理・ ³東大海洋研・ ⁴東北大院理・ ⁵IPGG RAS・ ⁶IMUB RAS・ ⁷IGM SBRAS)
^o上岡萌¹・ 寺田健太郎¹・ 河井洋輔¹・ 日高洋²・ 宮原正明²・ 木村光佑²・ 佐野有司³・ 高畑直人³・ 石田章純³・ 大谷栄治⁴・ 小澤信⁴・ Skublov, Sergey⁵・ Koroleva, Olga⁶・ Litasov, Konstanatin⁷・ Pkhilenko, Nikolai⁷

On February 15,2013, a meteorite fell into the area of Chelyabinsk in Russia .The petrology, mineralogy and geochemistry suggests that the Chelyabinsk meteorite is unambiguously classified into LL5 ordinary chondrite with an intensive shock metamorphism (Galimov et.al 2013). For understanding the thermal and/or impact history of the parent body of Chelyabinsk meteorite, we have performed the ion microprobe U-Pb dating of the phosphates in Chelyabinsk meteorite, which are the host-mineral of U in the ordinary chondrite.