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• Journal article
  Bada JL, Sephton MA, Ehrenfreund P, Mathies RA, Skelley AM, Grunthaner FJ, Zent AP, Quinn RC, Josset JL, Robert F, Botta O, Glavin DPet al., 2005,

  New strategies to detect life on Mars

  , ASTRONOMY & GEOPHYSICS, Vol: 46, Pages: 26-27, ISSN: 1366-8781
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  • Citations: 25
• Journal article
  Montgomery W, Zaug JM, Howard WM, Goncharov AF, Crowhurst JC, Jeanloz Ret al., 2005,

  Melting curve and high-pressure chemistry of formic acid to 8 GPa and 600 K

  , JOURNAL OF PHYSICAL CHEMISTRY B, Vol: 109, Pages: 19443-19447, ISSN: 1520-6106
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  • Citations: 24
• Journal article
  Sephton MA, Love GD, Meredith W, Snape CE, Sun CG, Watson JSet al., 2005,

  Hydropyrolysis: A new technique for the analysis of macromolecular material in meteorites

  , PLANETARY AND SPACE SCIENCE, Vol: 53, Pages: 1280-1286, ISSN: 0032-0633
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  • Citations: 25
• Journal article
  Verchovsky AB, Sephton MA, 2005,

  A noble record

  , ASTRONOMY & GEOPHYSICS, Vol: 46, Pages: 12-14, ISSN: 1366-8781
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  • Citations: 1
• Journal article
  Goncharov AF, Manaa MR, Zaug JM, Gee RH, Fried LE, Montgomery WBet al., 2005,

  Polymerization of formic acid under high pressure

  , PHYSICAL REVIEW LETTERS, Vol: 94, ISSN: 0031-9007
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  • Citations: 65
• Journal article
  Sephton MA, Meredith W, Sun CG, Snape CEet al., 2005,

  Hydropyrolysis as a preparative method for the compound-specific carbon isotope analysis of fatty acids

  , RAPID COMMUNICATIONS IN MASS SPECTROMETRY, Vol: 19, Pages: 323-325, ISSN: 0951-4198
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  • Citations: 17
• Journal article
  Sephton MA, Meredith W, Sun CG, Snape CEet al., 2005,

  Hydropyrolysis of steroids: a preparative step for compound-specific carbon isotope ratio analysis

  , RAPID COMMUNICATIONS IN MASS SPECTROMETRY, Vol: 19, Pages: 3339-3342, ISSN: 0951-4198
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  • Citations: 9
• Journal article
  Watson JS, Sephton MA, Looy CV, Gilmour Let al., 2005,

  Oxygen-containing aromatic compounds in a Late Permian sediment

  , ORGANIC GEOCHEMISTRY, Vol: 36, Pages: 371-384, ISSN: 0146-6380
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  • Citations: 25
• Journal article
  Sephton MA, Botta O, 2005,

  Recognizing life in the solar system: guidance from meteoritic organic matter

  , INT J ASTROBIOL, Vol: 4, Pages: 269-276, ISSN: 1473-5504
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• Conference paper
  Perry RS, Kolb VM, Lynne BY, Sephton MA, Mcloughlin N, Engel MH, Olendzenski L, Brasier M, Staley JTet al., 2005,

  How desert varnish forms? (art. no. 59060V)

  , Conference on Astrobiology and Planetary Missions, Publisher: The International Society for Optical Engineering, Pages: 1-12
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• Conference paper
  Perry RS, Kolb VM, Philip A I, Lynne BY, Mcloughlin N, Sephton MA, Wacey D, Green ORet al., 2005,

  Making silica rock coatings in the lab: synthetic desert varnish (art. no. 59060U)

  , Conference on Astrobiology and Planetary Missions, Publisher: The International Society for Optical Engineering, Pages: 1-11
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• Conference paper
  Sephton MA, Looy CV, Visscher H, Brinkhuis H, de Leeuw JWet al., 2005,

  The combined petrographic and chemical analysis of end-Permian kerogens

  , 8th International Meeting on Response of the Earth System to Impact Processes (IMPACT), Pages: 467-478

  The end of the Permian was marked by one of the greatest mass extinctions of all time. A valuable record of life and death during this event is contained within sedimentary organic matter. The stable isotopic, molecular and morphological information contained within remains of end-Permian organisms represent an important resource for scientists attempting to produce paleoenvironment reconstructions. Most meaningful data derive from multidisciplinary analyses of the same samples. In these circumstances it is desirable that sample preparation for one approach does not hinder subsequent analysis by another. To ensure compatibility of sample processing procedures the petrographic and chemical consequences of two common kerogen preparation steps, demineralization and screening (sieving), were simultaneously monitored using transmitted light microscopy and flash pyrolysis. Two end-Permian sediments, whose organic content was predominated by land-plant debris, were chosen for this purpose. A limestone was used to assess the problem of fluoride production when dematerializing carbonates and a marl was used to investigate the possibility of introducing a sampling bias following kerogen screening. Flash pyrolysis results of demineralization residues indicate that neoformed fluorides can be effectively removed by repeated treatments with excess concentrated HCl. Flash pyrolysis of screened size fractions (< 10 mu m, 10-18 mu m, 18-30 mu m, 30-125 mu m, 125-250 mu m, > 250 mu m) suggest that, for the end-Permian kerogen used, the various fractions are qualitatively representative of the unscreened kerogen. In a paleoenvironmental context, the homogeneity of the land plant derived kerogen reflects a period of organic accumulation on land followed by rapid deposition and burial in a marine setting. These findings constitute a step forward in the quest for parity between petrographic and chemical analyses of the same kerogen samples.

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• Journal article
  Koeberl C, Farley KA, Peucker-Ehrenbrink B, Sephton MAet al., 2004,

  Geochemistry of the end-Permian extinction event in Austria and Italy: No evidence for an extraterrestrial component

  , GEOLOGY, Vol: 32, Pages: 1053-1056, ISSN: 0091-7613
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  • Citations: 62
• 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
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  • Citations: 14
• Journal article
  Visscher H, Looy CV, Collinson ME, Brinkhuis H, Cittert JHAVKV, Kurschner 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
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  • Citations: 184
• 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
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• 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
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  • Citations: 27
• Journal article
  Sephton MA, 2004,

  Organic matter in ancient meteorites

  , ASTRONOMY & GEOPHYSICS, Vol: 45, Pages: 8-14, ISSN: 1366-8781
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  • Citations: 20
• 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
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• 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
  • Author Web Link
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  • Citations: 103

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