The mystery of the missing mantle problem and insights from spectroscopy

IF 3 2区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS Icarus Pub Date : 2025-02-11 DOI:10.1016/j.icarus.2025.116506
B.G. Rider-Stokes , S.L. Jackson , T.H. Burbine , R.C. Greenwood , E.M. MacLennan , L.F. White , S.S. Russell , M. Anand , M.M. Grady
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Abstract

Differentiation of planetesimals results in the segregation of materials, with the densest materials sinking, producing a metallic core, while the lighter fraction, rises, fabricating a crust. While there are multiple examples of planetary crusts (e.g., V-type asteroids) and metallic cores (e.g., M-type asteroids), there appears to be a scarcity of mantle-like materials in both the asteroid (e.g., A-type asteroids) and meteorite record. This lack of olivine-dominated material has been dubbed ‘The Missing Mantle Problem’. Here we measure the reflectance spectra of four olivine-rich meteorites expected to originate from the mantle of differing planetesimals. Following the Bus-DeMeo taxonomy, NWA 12264 and Chassigny can be classified as Sa-types, while NWA 8535 and NWA 15717 are classified as Q-types. This result implies that mantle-like materials are not restricted to A-type asteroids as previously expected. This study provides a significant step toward the resolution of the apparent shortage of olivine-rich material in the early Solar System.
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地幔失踪问题之谜和光谱学的启示
星子的分化导致了物质的分离,密度最大的物质下沉,形成金属核,而密度较轻的物质上升,形成地壳。虽然有许多行星地壳(例如,v型小行星)和金属核(例如,m型小行星)的例子,但在小行星(例如,a型小行星)和陨石记录中似乎缺乏地幔样物质。这种以橄榄石为主的物质的缺乏被称为“消失的地幔问题”。在这里,我们测量了四颗富含橄榄石的陨石的反射光谱,这些陨石被认为是来自不同星子的地幔。按照Bus-DeMeo分类法,NWA 12264和Chassigny可被划分为sa型,NWA 8535和NWA 15717可被划分为q型。这一结果表明,地幔状物质并不像之前预期的那样局限于a型小行星。这项研究为解决早期太阳系中富含橄榄石的物质的明显短缺问题迈出了重要的一步。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Icarus
Icarus 地学天文-天文与天体物理
CiteScore
6.30
自引率
18.80%
发文量
356
审稿时长
2-4 weeks
期刊介绍: Icarus is devoted to the publication of original contributions in the field of Solar System studies. Manuscripts reporting the results of new research - observational, experimental, or theoretical - concerning the astronomy, geology, meteorology, physics, chemistry, biology, and other scientific aspects of our Solar System or extrasolar systems are welcome. The journal generally does not publish papers devoted exclusively to the Sun, the Earth, celestial mechanics, meteoritics, or astrophysics. Icarus does not publish papers that provide "improved" versions of Bode''s law, or other numerical relations, without a sound physical basis. Icarus does not publish meeting announcements or general notices. Reviews, historical papers, and manuscripts describing spacecraft instrumentation may be considered, but only with prior approval of the editor. An entire issue of the journal is occasionally devoted to a single subject, usually arising from a conference on the same topic. The language of publication is English. American or British usage is accepted, but not a mixture of these.
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