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  • Journal article
    Butterworth AL, Aballain O, Chappellaz J, Sephton MAet al., 2004,

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

    , MON NOT R ASTRON SOC, Vol: 347, Pages: 807-812, ISSN: 0035-8711

    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.
  • Book chapter
    Sephton MA, 2004,

    Compound specific isotope analysis of the organic constituents in meteorites

    , Handbook of stable isotope analytical techniques, Editors: de Groot, London, Publisher: Elsevier, Pages: 229-236, ISBN: 9780444511140
  • Journal article
    Sephton MA, Verchovksy AB, Wright IP, 2004,

    Carbon and nitrogen isotope ratios in meteoritic organic matter; indicators of alteration processes on the parent asteroid

    , INT J ASTROBIOL, Vol: 3, Pages: 221-228, ISSN: 1473-5504
  • Book chapter
    Sephton MA, 2004,

    Origin of Life

    , An introduction to astrobiology, Editors: Gilmour, Sephton, Cambridge, Publisher: Cambridge University Press, Pages: 1-41, ISBN: 9780521837361
  • Journal article
    Bridges JC, Schwanethal JP, Pearson VK, Paton MD, Greenwood RC, Watson JS, Morgan GHet al., 2004,

    A very public fireball

    , Astronomy and Geophysics, Vol: 45, Pages: 625-626
  • Book
    Gilmour I, Sephton MA, 2004,

    An introduction to astrobiology

    , Cambridge, Publisher: Cambridge University Press, ISBN: 9780521837361
  • Journal article
    Pearson VK, Kearsley AT, Sephton MA, 2004,

    The in-situ detection of organic material in extraterrestrial samples

    , MICROS ANAL, Pages: 5-10, ISSN: 0958-1952
  • Journal article
    Watson JS, Pearson VK, Sephton MA, Gilmour Iet al., 2004,

    Molecular, isotopic and in-situ analytical approaches to the study of meteoritic organic material

    , International Journal of Astrobiology, Vol: 3, Pages: 107-116, ISSN: 1473-5504
  • Journal article
    Butterworth AL, Aballain A, Chappellaz J, Sephton MAet al., 2004,

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

    , MON NOT R ASTRON SOC, Vol: 347, Pages: 807-812, ISSN: 0035-8711
  • Journal article
    Sephton MA, Verchovsky AB, Bland PA, Gilmour I, Grady MM, Wright IPet al., 2003,

    Investigating the variations in carbon and nitrogen isotopes in carbonaceous chondrites

    , GEOCHIMICA ET COSMOCHIMICA ACTA, Vol: 67, Pages: 2093-2108, ISSN: 0016-7037
  • Journal article
    Watson JS, Pearson VK, Gilmour I, Sephton MAet al., 2003,

    Contamination by sesquiterpenoid derivatives in the Orgueil carbonaceous chondrite

    , ORGANIC GEOCHEMISTRY, Vol: 34, Pages: 37-47, ISSN: 0146-6380
  • Journal article
    Wignall PB, Zonneveld JP, Sephton MA, 2003,

    Carbon and nitrogen isotope disturbances and an end-Norian (Late Triassic) extinction event : comment and reply

    , GEOLOGY, Vol: 7, Pages: e25-e25, ISSN: 0091-7613
  • Journal article
    Pearson VK, Sephton MA, Kearsley AT, Bland PA, Franchi IA, Gilmour Iet al., 2002,

    Clay mineral-organic matter relationships in the early solar system

    , METEORITICS & PLANETARY SCIENCE, Vol: 37, Pages: 1829-1833, ISSN: 1086-9379
  • Journal article
    Sephton MA, Amor K, Franchi IA, Wignall PB, Newton R, Zonneveld JPet al., 2002,

    Carbon and nitrogen isotope disturbances and an end-Norian (Late Triassic) extinction event

    , GEOLOGY, Vol: 30, Pages: 1119-1122, ISSN: 0091-7613
  • Journal article
    Watson JS, Jones DM, Swannell RPJ, van Duin ACTet al., 2002,

    Formation of carboxylic acids during aerobic biodegradation of crude oil and evidence of microbial oxidation of hopanes

    , Organic Geochemistry, Vol: 33, Pages: 1153-1169, ISSN: 0146-6380
  • Journal article
    Verchovsky AB, Sephton MA, Wright IP, Pillinger CTet al., 2002,

    Separation of planetary noble gas carrier from bulk carbon in enstatite chondrites during stepped combustion

    , EARTH AND PLANETARY SCIENCE LETTERS, Vol: 199, Pages: 243-255, ISSN: 0012-821X
  • Journal article
    Sephton MA, 2002,

    Organic compounds in carbonaceous meteorites

    , NATURAL PRODUCT REPORTS, Vol: 19, Pages: 292-311, ISSN: 0265-0568
  • Journal article
    Sephton MA, Wright IP, Gilmour I, de Leeuw JW, Grady MM, Pillinger CTet al., 2002,

    High molecular weight organic matter in martian meteorites

    , PLANETARY AND SPACE SCIENCE, Vol: 50, Pages: 711-716, ISSN: 0032-0633
  • Conference paper
    Sephton MA, Veefkind RJ, Looy CV, Visscher H, Brinkhuis H, de Leeuw JWet al., 2002,

    Lateral variations in end-Permian organic matter in northern Italy

    , 3rd Workshop of the European-Science-Foundation IMPACT Programme, Publisher: SPRINGER-VERLAG BERLIN, Pages: 11-24
  • Book
    Sephton MA, Smith S, 2002,

    Landforms and cycles

    , London, Publisher: Open University Press, ISBN: 9780749252076

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