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  • Journal article
    Sephton MA, James RH, Bland PA, 2004,

    Lithium isotope analyses of inorganic constituents from the Murchison meteorite

    , ASTROPHYSICAL JOURNAL, Vol: 612, Pages: 588-591, ISSN: 0004-637X
  • Journal article
    Visscher H, Looy CV, Collinson ME, Brinkhuis H, Cittert JHAVKV, Kürschner WM, Sephton MAet al., 2004,

    Environmental mutagenesis during the end-Permian ecological crisis

    , PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, Vol: 101, Pages: 12952-12956, ISSN: 0027-8424
  • Conference paper
    Howard WM, Fried LE, Melius CF, Montgomery WB, Zaug JM, Goncharov AFet al., 2004,

    Kinetics of formic acid at high pressure and temperature.

    , 228th National Meeting of the American-Chemical-Society, Publisher: AMER CHEMICAL SOC, Pages: U277-U277, ISSN: 0065-7727
  • Journal article
    Sephton MA, Bland PA, Pillinger CT, Gilmour Iet al., 2004,

    The preservation state of organic matter in meteorites from Antarctica

    , METEORITICS & PLANETARY SCIENCE, Vol: 39, Pages: 747-754, ISSN: 1086-9379
  • Journal article
    Sephton MA, 2004,

    Organic matter in ancient meteorites

    , ASTRONOMY & GEOPHYSICS, Vol: 45, Pages: 8-14, ISSN: 1366-8781
  • Conference paper
    Zaug JM, Montgomery WB, Goncharov AF, Crowhurst JC, Howard WM, Fried LE, Meliuss CFet al., 2004,

    FTIR studies of high-pressure formic acid reactions: Extreme chemistry decomposition kinetics.

    , 227th National Meeting of the American-Chemical Society, Publisher: AMER CHEMICAL SOC, Pages: U1221-U1221, ISSN: 0065-7727
  • Journal article
    Sephton MA, Love GD, Watson JS, Verchovsky AB, Wright IP, Snape CE, Gilmour Iet al., 2004,

    Hydropyrolysis of insoluble carbonaceous matter in the Murchison meteorite: New insights into its macromolecular structure

    , GEOCHIMICA ET COSMOCHIMICA ACTA, Vol: 68, Pages: 1385-1393, ISSN: 0016-7037
  • 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.
  • 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
  • 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
    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
    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
    Gilmour I, Sephton MA, 2004,

    An introduction to astrobiology

    , Cambridge, Publisher: Cambridge University Press, ISBN: 9780521837361
  • 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
    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
  • 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, 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
    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
    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
    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

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