Q-Gases in a Late-Forming Refractory Interplanetary Dust Particle: A Link to Comet Wild 2

1Ryan C.Ogliore,2Russell L.Palma,3 Julien Stodolna,4Kazuhide Nagashima,5Robert O.Pepin,5 D.J.Schlutter,6Zack Gainsforth,6Andrew J.Westphal,4Gary R.Huss
Geochimica et Cosmochimica Acta (in Press) Link to Article [https://doi.org/10.1016/j.gca.2019.11.033]
1Department of Physics, Washington University in St. Louis, St. Louis, MO 63130
2Minnesota State University – Mankato
3EDF Lab les Renardiéres 77818 Moret Sur Loing France
4Hawai‘i Institute of Geophysics and Planetology, University of Hawai‘i at Mānoa, Honolulu, HI 96822
5University of Minnesota – Twin Cities
6Space Sciences Laboratory, University of California at Berkeley
Copyright Elsevier

We report the structure, chemical composition, O, Al-Mg, He, and Ne isotope systematics of an interplanetary dust particle, “Manchanito”. These analyses indicate that Manchanito solidified as refractory glass (with oxidized Fe but reduced Ti) in a chondrule-like formation environment more than 3.2 Myr after CAIs, after which it was exposed to Q-like noble gases in the dissipating solar nebula. Manchanito’s He and Ne isotopic composition and concentrations are similar to those measured in samples of comet Wild 2, from which we infer that Manchanito’s parent body was a comet. We propose that after formation and exposure to Q-like gases, Manchanito was transported to the outer Solar System where it came into contact with organics and volatile ices on its cometary parent body. Manchanito provides additional evidence that cometary solids have been subjected to energetic processing and large-scale transport in a wide range of environments in the Solar System.


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