Open AccessCombined element (H and C) stable isotope ratios of methane in carbonaceous chondrites
Author(s) -
Butterworth Anna L.,
Aballain Olivier,
Chappellaz Jerome,
Sephton Mark A.
Publication year - 2004
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2004.07251.x
Subject(s) - murchison meteorite , meteorite , chondrite , astrobiology , carbonaceous chondrite , methane , cosmochemistry , physics , extraterrestrial life , hydrogen , formation and evolution of the solar system , carbon fibers , astrochemistry , solar system , presolar grains , astrophysics , chemistry , interstellar medium , materials science , organic chemistry , composite material , quantum mechanics , galaxy , composite number
We have performed the first ever combined‐element stable isotopic measurements of extraterrestrial molecules. Methane from two carbonaceous chondrites, Murchison and Cold Bokkeveld, was measured for its hydrogen and carbon isotopic compositions. The combined isotopic composition of meteoritic methane reveals information about the indigenous nature of volatile aliphatic organic matter in meteorites and its probable extraterrestrial source environment. Deuterium enrichments relative to the solar nebula 4.6 Gyr ago reflect a contribution from low‐temperature chemical reactions in interstellar space. Similar carbon but different hydrogen isotopic compositions for methane in the two meteorite samples probably represent comparable primary origins but varying levels of secondary processing and exchange with isotopically light hydrogen. Our high precision laboratory‐obtained measurements provide valuable reference points for observational spectroscopists undertaking astronomical investigations of the stable isotopic composition of extraterrestrial methane.