A TEM study of thermally modified comet 81P/Wild 2 dust particles by interactions with the aerogel matrix during the Stardust capture process

Hugues Leroux, Frans J M Rietmeijer, Michael A. Velbel, Adrian J. Brearley, Damien Jacob, Falko Langenhorst, John C. Bridges, Thomas Zega, Rhonda M. Stroud, Patrick Cordier, Ralph P. Harvey, Martin Lee, Matthieu Gounelle, Mike E. Zolensky

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Abstract

We report the results of high-resolution, analytical and scanning transmission electron microscopy (STEM), including intensive element mapping, of severely thermally modified dust from comet 81P/Wild 2 caught in the silica aerogel capture cells of the Stardust mission. Thermal interactions during capture caused widespread melting of cometary silicates, Fe-Ni-S phases, and the aerogel. The characteristic assemblage of thermally modified material consists of a vesicular, silica-rich glass matrix with abundant Fe-Ni-S droplets, the latter of which exhibit a distinct core-mantle structure with a metallic Fe,Ni core and a iron-sulfide rim. Within the glassy matrix, the elemental distribution is highly heterogeneous. Localized amorphous "dust-rich" patches contain Mg, Al, and Ca in higher abundances and suggest incomplete mixing of silicate progenitors with molten aerogel. In some cases, the element distribution within these patches seems to depict the outlines of ghost mineral assemblages, allowing the reconstruction of the original mineralogy. A few crystalline silicates survived with alteration limited to the grain rims. The Fe- and Cl-normalized bulk composition derived from several sections show Cl-chondrite relative abundances for Mg, Al, S, Ca, Cr, Mn, Fe, and Ni. The data indicate a 5 to 15% admixture of fine-grained chondritic comet dust with the silica glass matrix. These strongly thermally modified samples could have originated from a fine-grained primitive material, loosely bound Wild 2 dust aggregates, which were heated and melted more efficiently than the relatively coarse-grained material of the crystalline particles found elsewhere in many of the same Stardust aerogel tracks (Zolensky et al. 2006).

Original languageEnglish (US)
Pages (from-to)97-120
Number of pages24
JournalMeteoritics and Planetary Science
Volume43
Issue number1-2
StatePublished - Jan 2008
Externally publishedYes

Fingerprint

Wild 2 comet
aerogels
comet
transmission electron microscopy
dust
silicates
matrix
silicate
silica
silica glass
matrices
rims
Stardust Mission
glass
interactions
mantle structure
iron sulfide
chondrites
mineralogy
ghosts

ASJC Scopus subject areas

  • Geophysics

Cite this

Leroux, H., Rietmeijer, F. J. M., Velbel, M. A., Brearley, A. J., Jacob, D., Langenhorst, F., ... Zolensky, M. E. (2008). A TEM study of thermally modified comet 81P/Wild 2 dust particles by interactions with the aerogel matrix during the Stardust capture process. Meteoritics and Planetary Science, 43(1-2), 97-120.

A TEM study of thermally modified comet 81P/Wild 2 dust particles by interactions with the aerogel matrix during the Stardust capture process. / Leroux, Hugues; Rietmeijer, Frans J M; Velbel, Michael A.; Brearley, Adrian J.; Jacob, Damien; Langenhorst, Falko; Bridges, John C.; Zega, Thomas; Stroud, Rhonda M.; Cordier, Patrick; Harvey, Ralph P.; Lee, Martin; Gounelle, Matthieu; Zolensky, Mike E.

In: Meteoritics and Planetary Science, Vol. 43, No. 1-2, 01.2008, p. 97-120.

Research output: Contribution to journalArticle

Leroux, H, Rietmeijer, FJM, Velbel, MA, Brearley, AJ, Jacob, D, Langenhorst, F, Bridges, JC, Zega, T, Stroud, RM, Cordier, P, Harvey, RP, Lee, M, Gounelle, M & Zolensky, ME 2008, 'A TEM study of thermally modified comet 81P/Wild 2 dust particles by interactions with the aerogel matrix during the Stardust capture process', Meteoritics and Planetary Science, vol. 43, no. 1-2, pp. 97-120.
Leroux, Hugues ; Rietmeijer, Frans J M ; Velbel, Michael A. ; Brearley, Adrian J. ; Jacob, Damien ; Langenhorst, Falko ; Bridges, John C. ; Zega, Thomas ; Stroud, Rhonda M. ; Cordier, Patrick ; Harvey, Ralph P. ; Lee, Martin ; Gounelle, Matthieu ; Zolensky, Mike E. / A TEM study of thermally modified comet 81P/Wild 2 dust particles by interactions with the aerogel matrix during the Stardust capture process. In: Meteoritics and Planetary Science. 2008 ; Vol. 43, No. 1-2. pp. 97-120.
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AU - Jacob, Damien

AU - Langenhorst, Falko

AU - Bridges, John C.

AU - Zega, Thomas

AU - Stroud, Rhonda M.

AU - Cordier, Patrick

AU - Harvey, Ralph P.

AU - Lee, Martin

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