open access

https://hdl.handle.net/2115/42843

On the formation and processing of carbon and nitrogen compounds in carbonaceous chondrites

英語

1990-10

National Institute of Polar Research

Proceedings of the NIPR Symposium on Antarctic Meteorites

3

220-229

Fourteenth Symposium on Antarctic Meteorites. 6-8 June　1989. National Institute of Polar Research, Tokyo, Japan.

On the basis of chemical kinetic consideration, we examine processing of carbon and nitrogen compounds that leads to the linear relation between the logarithmic contents of C and N in carbonaceous chondrites: log N=a log C-b, found by A. Shimoyama et al. (Chem. Lett., 10, 2013, 1987), where a>1 and b are constants. It is shown that the linear relation results from dissociation of organic polymer in the grains before accretion to parent body-sized objects by radiation that penetrates through the grains such as cosmic ray. Condensation of volatile molecules composed of C and N is also examined as a possible process to form precursors of organic compounds in carbonaceous chondrites. From an analysis of a model thermodynamic system, it is conjectured that this process can also realize the linear relation under certain conditions.

会議発表論文

Version of Record

本文データは学協会の許諾に基づきCiNiiから複製したものである

0914-5621

AA10784627