Kumtag 061: A heavily shocked brachinite

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Yuwei Zhang, Dongliang Zhang, Thomas Smith, P. M. Ranjith, Huaiyu He, Guangming Song, Yan Fan & Shijie Li

Acta Geochimica, Published: 21 March 2025

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“Brachinite is a group of primitive achondrites that enables investigating the evolution of asteroids not fully differentiated in the early stage of the solar system. Kumtag 061 is a new meteorite sample collected on October 27, 2019, in Kumtag Desert, Xinjiang Province, China. The oxygen isotope composition (δ18O = 5.086‰, δ17O = 2.396‰, Δ’17O =  − 0.298‰) and petrologic and mineralogic analysis suggest Kumtag 061 is a heavy-impacted brachinite (S4–S5). The geochemical composition suggests Kumtag 061 represents a partial melting residue of the brachinite parent body. Based on the noble gas composition, the cosmic ray exposure age of Kumtag 061 is 60.9 ± 9.0 Ma. Combined with the gas retention ages, they indicate a (series of) thermal events on the parent body of brachinites before Kumtag 061 was ejected into space.”

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