Combined element (H and C) stable isotope ratios of methane in carbonaceous chondrites

被引：16
作者：
Butterworth, AL
Aballain, O
Chappellaz, J
Sephton, MA
机构：
[1] Open Univ, Planetary & Space Sci Res Inst, Milton Keynes MK7 6AA, Bucks, England
[2] UJF, CNRS, Lab Glaciol & Geophys Environm, F-38402 St Martin Dheres, France
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2004年 / 347卷 / 03期
关键词：
astrochemistry; molecular data; methods : laboratory; meteors; meteoroids; Solar system : formation; ISM : molecules;
D O I：
10.1111/j.1365-2966.2004.07251.x
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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.
引用
收藏
页码：807 / 812
页数：6
相关论文
共 46 条
[1]  
BECKER RH, 1982, GEOCHIM COSMOCHIM AC, V34, P257
[2]   High-precision delta H-2 and delta O-18 measurement for water and volatile organic compounds by continuous-flow pyrolysis isotope ratio mass spectrometry [J].
Begley, IS ;
Scrimgeour, CM .
ANALYTICAL CHEMISTRY, 1997, 69 (08) :1530-1535
[3]   LIGHT HYDROCARBON GASES C-13, AND ORIGIN OF ORGANIC MATTER IN CARBONACEOUS CHONDRITES [J].
BELSKY, T ;
KAPLAN, IR .
GEOCHIMICA ET COSMOCHIMICA ACTA, 1970, 34 (03) :257-&
[4]   Changes in the global atmospheric methane budget over the last decades inferred from 13C and D isotopic analysis of Antarctic firn air [J].
Bräunlich, M ;
Aballanin, O ;
Marik, T ;
Jöckel, P ;
Brenninkmeijer, CAM ;
Chappellaz, J ;
Barnola, JM ;
Mulvaney, R ;
Sturges, WT .
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2001, 106 (D17) :20465-20481
[5]   Sulfur and hydrogen isotope anomalies in meteorite sulfonic acids [J].
Cooper, GW ;
Thiemens, MH ;
Jackson, TL ;
Chang, S .
SCIENCE, 1997, 277 (5329) :1072-1074
[6]   MOLECULAR AND ISOTOPIC ANALYSES OF THE HYDROXY-ACIDS, DICARBOXYLIC-ACIDS, AND HYDROXYDICARBOXYLIC ACIDS OF THE MURCHISON METEORITE [J].
CRONIN, JR ;
PIZZARELLO, S ;
EPSTEIN, S ;
KRISHNAMURTHY, RV .
GEOCHIMICA ET COSMOCHIMICA ACTA, 1993, 57 (19) :4745-4752
[7]   Enantiomeric excesses in meteoritic amino acids [J].
Cronin, JR ;
Pizzarello, S .
SCIENCE, 1997, 275 (5302) :951-955
[8]  
de Bergh C, 1995, Adv Space Res, V15, P427, DOI 10.1016/S0273-1177(99)80114-8
[9]   Organic molecules in the interstellar medium, comets, and meteorites: A voyage from dark clouds to the early earth [J].
Ehrenfreund, P ;
Charnley, SB .
ANNUAL REVIEW OF ASTRONOMY AND ASTROPHYSICS, 2000, 38 :427-+
[10]   Isotopic evidence for extraterrestrial non-racemic amino acids in the Murchison meteorite [J].
Engel, MH ;
Macko, SA .
NATURE, 1997, 389 (6648) :265-268
12345