The Fukang pallasite: Characterization and implications for the history of the Main-group parent body

Daniella N. DellaGiustina, Namrah Habib, Kenneth J. Domanik, Dolores H. Hill, Dante Lauretta, Yulia S. Goreva, Marvin Killgore, Yang Hexiong, Robert T Downs

Research output: Contribution to journalArticle

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Abstract

We report the results of a study of the Fukang pallasite that includes measurements of bulk composition, mineral chemistry, mineral structure, and petrology. Fukang is a Main-group pallasite that consists of semiangular olivine grains (Fo 86.3) embedded in an Fe-Ni matrix with 9–10 wt% Ni and low-Ir (45 ppb). Olivine grains sometimes occur in large clusters up to 11 cm across. The Fe-Ni phase is primarily kamacite with accessory taenite and plessite. Minor phases include schreibersite, chromite, merrillite, troilite, and low-Ca pyroxene. We describe a variety of silicate inclusions enclosed in olivine that contain phases rarely or not previously reported in Main-group pallasites, including clinopyroxene (augite), tridymite, K-rich felsic glass, and an unknown Ca-Cr silicate. Pressure constraints determined from tridymite (<0.4 GPa), two-pyroxene barometry (0.39 ± 0.07 GPa), and geophysical calculations that assume pallasite formation at the core–mantle boundary (CMB), provide an upper estimate on the size of the Main-group parent body from which Fukang originated. We conclude that Fukang originated at the CMB of a large differentiated planetesimal 400–680 km in radius.

Original languageEnglish (US)
Pages (from-to)1781-1807
Number of pages27
JournalMeteoritics and Planetary Science
Volume54
Issue number8
DOIs
StatePublished - Jan 1 2019

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parent body
olivine
tridymite
histories
pyroxene
silicates
schreibersite
silicate
history
kamacite
minerals
taenite
troilite
barometry
chromites
petrology
protoplanets
accessories
planetesimal
augite

ASJC Scopus subject areas

  • Geophysics
  • Space and Planetary Science

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The Fukang pallasite : Characterization and implications for the history of the Main-group parent body. / DellaGiustina, Daniella N.; Habib, Namrah; Domanik, Kenneth J.; Hill, Dolores H.; Lauretta, Dante; Goreva, Yulia S.; Killgore, Marvin; Hexiong, Yang; Downs, Robert T.

In: Meteoritics and Planetary Science, Vol. 54, No. 8, 01.01.2019, p. 1781-1807.

Research output: Contribution to journalArticle

DellaGiustina, DN, Habib, N, Domanik, KJ, Hill, DH, Lauretta, D, Goreva, YS, Killgore, M, Hexiong, Y & Downs, RT 2019, 'The Fukang pallasite: Characterization and implications for the history of the Main-group parent body', Meteoritics and Planetary Science, vol. 54, no. 8, pp. 1781-1807. https://doi.org/10.1111/maps.13313
DellaGiustina, Daniella N. ; Habib, Namrah ; Domanik, Kenneth J. ; Hill, Dolores H. ; Lauretta, Dante ; Goreva, Yulia S. ; Killgore, Marvin ; Hexiong, Yang ; Downs, Robert T. / The Fukang pallasite : Characterization and implications for the history of the Main-group parent body. In: Meteoritics and Planetary Science. 2019 ; Vol. 54, No. 8. pp. 1781-1807.
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