Japan Geoscience Union Meeting 2014

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Poster

Symbol P (Space and Planetary Sciences) » P-PS Planetary Sciences

[P-PS22_1PO1] Planetary processes from meteorites and experimental works

Thu. May 1, 2014 6:15 PM - 7:30 PM Poster (3F)

Convener:*Kimura Makoto(Faculty of Science, Ibaraki University), Eiji Ohtani(Department of Earth and Planetary Materials Science, Graduate School of Science, Tohoku University), Masaaki Miyahara Masaaki(Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University)

6:15 PM - 7:30 PM

[PPS22-P02] Secondary Ion Mass Spectrometry (SHRIMP) U-Pb dating of Chelyabinsk meteorite

*Moe KAMIOKA1, Kentaro TERADA1, Hiroshi HIDAKA2, Kosuke KIMURA2, Sergey SKUBLOV3 (1.Osaka University, Department of Earth and Space Science, 2.Guraduate school of Science, Hiroshima University, 3.Institute of Precambrian Geology and Geochronology,)

Keywords:Chelyabinsk meteorite, SHRIMP, phosphate, U-Pb dating

On Feburuary 15,2013, a meteorite fell into the area of Chelyabinsk in Russia .The petrographic and chemical analysis of the Chelyabinsk meteorite unambiguously classifies it as an LL5 ordinary chondrite (Galimov et al.2013). The reported Sm-Nd age of 3.7 Ga and Rb-Sr age of 0.29 Ga suggest that the Chelyabinsk meteorites could have suffered from the secondary event possibly due to shock metamorphism.For further understanding of the thermal history of Chelyabinsk meteorite, we carried out an in-situ U-Pb dating of phosphates of which closure temperatures is high (~600℃), using Hiroshima-SHRIMP.(Sensitive High-Resolution Ion MicroProbe).