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  • Journal article
    Carvallo C, Muxworthy AR, Dunlop DJ, 2006,

    First-order reversal curve (FORC) diagrams of magnetic mixtures: Micromagnetic models and measurements

    , Physics of the Earth and Planetary Interiors, Vol: 154, Pages: 308-322
  • Journal article
    Lagroix F, Muxworthy A, Hoffmann V, 2006,

    Developments in techniques and methods related to rock magnetism

    , PHYSICS OF THE EARTH AND PLANETARY INTERIORS, Vol: 154, Pages: 209-209, ISSN: 0031-9201
  • Journal article
    Williams W, Muxworthy AR, 2006,

    Understanding viscous magnetization of multidomain magnetite

    , JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, Vol: 111, ISSN: 2169-9313
  • Journal article
    Wünnemann K, Collins GS, Melosh HJ, 2006,

    A strain-based porosity model for use in hydrocode simulations of impacts and implications for transient crater growth in porous targets

    , ICARUS, Vol: 180, Pages: 514-527, ISSN: 0019-1035
  • Journal article
    Muxworthy AR, Williams W, 2006,

    Observations of viscous magnetization in multidomain magnetite - art. no. B01103

    , JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, Vol: 111, ISSN: 2169-9313
    • Cite
    • Citations: 14
  • Journal article
    Nielsen SG, Rehkämper M, Norman MD, Halliday AN, Harrison Det al., 2006,

    Thallium isotopic evidence for ferromanganese sediments in the mantle source of Hawaiian basalts

    , NATURE, Vol: 439, Pages: 314-317, ISSN: 0028-0836
    • Cite
    • Citations: 102
  • Journal article
    Matrajt G, Guan Y, Leshin L, Taylor S, Genge M, Joswaik D, Brownlee Det al., 2006,

    Oxygen isotope systematics of individual unmelted Antarctic micrometeorites.

    , Geochimica et Cosmochimica Acta, Vol: 70, Pages: 4007-4018
  • Journal article
    Meredith W, Sun C-G, Snape CE, Sephton MA, Love GDet al., 2006,

    The use of model compounds to investigate the release of covalently bound biomarkers via hydropyrolysis

    , ORG GEOCHEM, Vol: 37, Pages: 1705-1714
  • Journal article
    Sephton MA, Howard LE, Bland PA, James RH, Russell SR, Prior DJ, Zolensky MEet al., 2006,

    Delving into Allende's dark secrets

    , ASTRON GEOPHYS, Vol: 47, Pages: 37-38, ISSN: 1366-8781
  • Journal article
    Pearson VK, Sephton MA, Franchi IA, Gibson JM, Gilmour Iet al., 2006,

    Carbon and nitrogen in carbonaceous chondrites:Elemental abundances and stable isotopic compositions

    , METEORIT PLANET SCI, Vol: 41, Pages: 1899-1918, ISSN: 1086-9379
  • Conference paper
    Muxworthy AR, 2006,

    Magnetostatic Interactions:Palaeomagnetic signals and magnetotactic bacteria

    , Deparmental Seminar, Chinese Academy of Sciences
  • Conference paper
    Heslop D, Muxworthy AR, 2006,

    Selecting suitable smoothing factors for First-Order Reversal Curve distributions (poster)

    , EGU
  • Journal article
    Ehrenfreund P, Sephton MA, 2006,

    Carbon molecules in space: from astrochemistry to astrobiology

    , FARADAY DISCUSSIONS, Vol: 133, Pages: 277-288, ISSN: 1359-6640
  • Journal article
    Court RW, Sephton MA, Parnell J, Gilmour Iet al., 2006,

    The alteration of organic matter in response to ionising irradiation: Chemical trends and implications for extraterrestrial sample analysis

    , Geochimica et Cosmochimica Acta, Vol: 70, Pages: 1020-1039

    Ionising radiation is an energy source capable of generating and altering complex organic matter. A full understanding of the radiolytic formation and devolution of organic matter is essential to appreciate the budget of organic chemicals that exist in cometary and interstellar ices, carbonaceous meteorites, and to understand the results of analyses of irradiated extraterrestrial organic matter, such as that in cometary nuclei. The effects of ionising radiation on a set of 10 naturally occurring, terrestrial organic assemblages have been revealed by pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS), carbon isotopic analysis, and stepped combustion-isotope ratio mass spectrometry (SC-IRMS). Progressive radiolytic alteration of biogenic complex-hydrocarbon mixtures induces a decrease in the average size and extent of alkylation of polyaromatic hydrocarbons (PAH) and an increase in the abundance of oxygen-containing compounds, as indicated by Py-GC-MS, and an enrichment in C-13. These changes are attributed to reactions with free radicals, produced by ionising radiation. In contrast, the progressive radiolytic alteration of bitumens proposed to have derived from the radiolytic polymerisation of methane into an organic solid produces, upon pyrolysis, PAH of increasing average size and degree of alkylation. This, the opposite of the trend observed in the irradiated complex-hydrocarbons mixtures, cannot be explained in terms of the radiolytic alteration of a pre-existing array of complex organic molecules. Instead, it suggests the gradual construction of PAH from smaller molecules, supporting the hypothesis of a methane origin. Radiolytic alteration is also associated with a previously unrecognised increase in the mean combustion temperature of organic matter. This leads to predictions regarding the combustion characteristics of the irradiated organic matter present on cometary nuclei. A full understanding of the relationship between the combustion characteristics
  • Journal article
    Perry RS, Lynne BY, Sephton MA, Kolb VM, Perry CC, Staley JTet al., 2006,

    Baking black opal in the desert sun: the importance of silica in desert varnish, 2006, Geology, 34, 537-540

    , Geology, Vol: 34, Pages: 537-540, ISSN: 0091-7613
  • Conference paper
    Krasa D, Williams W, Wilkinson CD, Gadegaard N, Zhou H, Roberts AP, Muxworthy ARet al., 2006,

    Nanosized Magnetite Particle Assemblages Produced by Electron Beam Lithography (poster)

    , AGU Fall
  • Conference paper
    Sephton MA, Self S, Verchovsky AB, Grady MM, Perry RS, Engel MH, Wright Iet al., 2006,

    Carbon isotopic gradients in the Martian crust: implications for past or present life on Mars

    , Conference on Instruments, Methods, and Missions for Astrobiology IX, Publisher: SPIE-INT SOC OPTICAL ENGINEERING, ISSN: 0277-786X
  • Journal article
    Martins Z, Watson JS, Sephton MA, Botta O, Ehenfreund P, Gilmour Iet al., 2006,

    Free dicarboxylic and aromatic acids in the carbonaceous chondrites Murchison and Orgueil

    , Meteoritics & Planetary Science, Vol: 41, Pages: 1073-1080, ISSN: 1086-9379
  • Book chapter
    Bland PA, Zolensky ME, Benedix GK, Sephton MAet al., 2006,

    Weathering of chondritic meteorites

    , Meteorites and the Early Solar System II, Editors: Lauretta, McSween, Lauretta, McSween, Arizona, Publisher: University of Arizona Press, Pages: 853-867, ISBN: 9780816525621
  • Conference paper
    Muxworthy AR, Williams W, 2006,

    Critical single-domain/multidomain grain-sizes in non-interacting and interacting elongated magnetite particles: implications for magnetosomes (poster)

    , AGU Fall

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