Acid-susceptive material as a host phase of argon-rich noble gas in the carbonaceous chondrite Ningqiang

Tomoki Nakamura, Michael Zolensky, Minoru Sekiya, Ryuji Okazaki, Keisuke Nagao

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

A fine-grained dark inclusion in the Ningqiang carbonaceous chondrite consists of relatively pristine solar nebular materials and has high concentrations of heavy primordial rare gases. Trapped 36 Ar concentration amounts to 6 × 10-6 cc STP/g, which is higher than that of Ningqiang host by a factor of three. Light HF-HCI etching of the dark inclusion removed 86, 73, and 64% of the primordial 36Ar, 84Kr, and 132Xe, respectively. Thus, the majority of the noble gases in this inclusion are located in very acid-susceptive material. Based on the elemental composition, the noble gases lost from the dark inclusion during the acid-treatments are Ar-rich, and the noble gases remaining in the inclusion are Q and HL gases. Transmission electron microscopy showed that the acid treatments removed thin Si, Mg, and Fe-rich amorphous rims present around small olivine and pyroxene grains in the dark inclusion, suggesting that the Ar-rich gases reside in the amorphous layers. A possible origin of the Ar-rich gases is the acquisition of noble-gas ions with a composition fractionated relative to solar abundance favoring the heavy elements by the effect of incomplete ionization under plasma conditions at 8000 K electron temperature.

Original languageEnglish
Pages (from-to)243-250
Number of pages8
JournalMeteoritics and Planetary Science
Volume38
Issue number2
DOIs
Publication statusPublished - Jan 1 2003

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carbonaceous chondrites
carbonaceous chondrite
noble gas
argon
rare gases
inclusions
acids
acid
gas
etching
gases
pyroxene
transmission electron microscopy
olivine
ionization
heavy elements
rims
plasma
electron
material

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Space and Planetary Science

Cite this

Acid-susceptive material as a host phase of argon-rich noble gas in the carbonaceous chondrite Ningqiang. / Nakamura, Tomoki; Zolensky, Michael; Sekiya, Minoru; Okazaki, Ryuji; Nagao, Keisuke.

In: Meteoritics and Planetary Science, Vol. 38, No. 2, 01.01.2003, p. 243-250.

Research output: Contribution to journalArticle

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