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<p>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 (<i>δ</i><sup>18</sup>O = 5.086‰, <i>δ</i><sup>17</sup>O = 2.396‰, Δ’<sup>17</sup>O =  − 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&#xa0;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.</p>

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Kumtag 061: A heavily shocked brachinite

  • 期刊论文

  • 发表日期：

    2025年3月21日

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

摘要

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.