Mn–Cr ages and formation conditions of fayalite in CV3 carbonaceous chondrites: Constraints on the accretion ages of chondritic asteroids

Kaori Jogo, Tomoki Nakamura, Motoo Ito, Shigeru Wakita, Mikhail Zolotov, Scott R. Messenger

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    Chondritic planetesimals are among the first planetary bodies that accreted inside and outside water snow line in the protoplanetary disk. CV3 carbonaceous chondrite parent body accreted relatively small amount of water ice, probably near the snow line, and experienced water-assisted metasomatic alteration that resulted in formation of diverse secondary minerals, including fayalite (Fa80–100). Chemical compositions of the CV3 fayalite and its Mn–Cr isotope systematics indicate that it formed at different temperature (10–300 °C) and fluid pressure (3–300 bars) but within a relatively short period of time. Thermal modeling of the CV3 parent body suggests that it accreted ∼3.2–3.3 Ma after CV3 CAIs formation and had a radius of >110–150 km. The inferred formation age of the CV3 parent body is similar to that of the CM2 chondrite parent body that probably accreted beyond the snow line, but appears to have postdated accretion of the CO and ordinary chondrite parent bodies that most likely formed inside the snow line. The inferred differences in the accretion ages of chondrite parent bodies that formed inside and outside snow line are consistent with planetesimal formation by gravitational/streaming instability.

    Original languageEnglish (US)
    Pages (from-to)58-74
    Number of pages17
    JournalGeochimica et Cosmochimica Acta
    Volume199
    DOIs
    StatePublished - Feb 15 2017

    Fingerprint

    Asteroids
    fayalite
    carbonaceous chondrite
    parent body
    Snow
    asteroid
    accretion
    snow
    planetesimal
    Water
    chondrite
    Computer aided instruction
    Ice
    Carbon Monoxide
    ordinary chondrite
    Isotopes
    secondary mineral
    Minerals
    fluid pressure
    water

    Keywords

    • Age determination
    • Aqueous alteration
    • CV3 carbonaceous chondrites
    • Equilibrium thermodynamics
    • Fayalite
    • Mn–Cr method
    • Thermal modeling

    ASJC Scopus subject areas

    • Geochemistry and Petrology

    Cite this

    Mn–Cr ages and formation conditions of fayalite in CV3 carbonaceous chondrites : Constraints on the accretion ages of chondritic asteroids. / Jogo, Kaori; Nakamura, Tomoki; Ito, Motoo; Wakita, Shigeru; Zolotov, Mikhail; Messenger, Scott R.

    In: Geochimica et Cosmochimica Acta, Vol. 199, 15.02.2017, p. 58-74.

    Research output: Contribution to journalArticle

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