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  • Journal article
    Sephton MA, 2014,

    Astrobiology can help space science, education and the economy

    , Space Policy, Vol: 30, Pages: 146-148, ISSN: 0265-9646
  • Journal article
    Muxworthy AR, Krasa D, Williams W, Almeida TPet al., 2014,

    Paleomagnetic recording fidelity of nonideal magnetic systems

    , GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS, Vol: 15, Pages: 2254-2261, ISSN: 1525-2027
  • Journal article
    Murphy K, Rehkaemper M, van de Flierdt T, 2014,

    Comment on "The isotopic composition of cadmium in the water column of the South China Sea"

    , GEOCHIMICA ET COSMOCHIMICA ACTA, Vol: 134, Pages: 335-338, ISSN: 0016-7037
  • Journal article
    Crocket KC, Lambelet M, de Flierdt TV, Rehkaemper M, Robinson LFet al., 2014,

    Measurement of fossil deep-sea coral Nd isotopic compositions and concentrations by TIMS as NdO+, with evaluation of cleaning protocols

    , CHEMICAL GEOLOGY, Vol: 374, Pages: 128-140, ISSN: 0009-2541
  • Journal article
    Hettmann K, Kreissig K, Rehkaemper M, Wenzel T, Mertz-Kraus R, Markl Get al., 2014,

    Thallium geochemistry in the metamorphic Lengenbach sulfide deposit, Switzerland: Thallium-isotope fractionation in a sulfide melt

    , AMERICAN MINERALOGIST, Vol: 99, Pages: 793-803, ISSN: 0003-004X
  • Journal article
    Montgomery W, Watson JS, Sephton MA, 2014,

    An organic cosmo-barometer: Distinct pressure and temperature effects for methyl substituted polycyclic aromatic hydrocarbons

    , Astrophysical Journal, Vol: 784, ISSN: 0004-637X

    There are a number of key structures that can be used to reveal the formation and modification history of organic matter in the cosmos. For instance, the susceptibility of organic matter to heat is well documented and the relative thermal stabilities of different isomers can be used as cosmothermometers. Yet despite being an important variable, no previously recognized organic marker of pressure exists. The absence of a pressure marker is unfortunate considering our ability to effectively recognize extraterrestrial organic structures both remotely and in the laboratory. There are a wide variety of pressures in cosmic settings that could potentially be reflected by organic structures. Therefore, to develop an organic cosmic pressure marker, we have used state-of-the-art diamond anvil cell (DAC) and synchrotron-source Fourier transform infrared (FTIR) spectroscopy to reveal the effects of pressure on the substitution patterns for representatives of the commonly encountered methyl substituted naphthalenes, specifically the dimethylnaphthalenes. Interestingly, although temperature and pressure effects are concordant for many isomers, pressure appears to have the opposite effect to heat on the final molecular architecture of the 1,5-dimethylnaphthalene isomer. Our data suggest the possibility of the first pressure parameter or "cosmo-barometer" (1,5-dimethylnaphthalene/total dimethylnaphthalenes) that can distinguish pressure from thermal effects. Information can be obtained from the new pressure marker either remotely by instrumentation on landers or rovers or directly by laboratory measurement, and its use has relevance for all cases where organic matter, temperature, and pressure interplay in the cosmos. © 2014. The American Astronomical Society. All rights reserved.

  • Journal article
    Bray VJ, Collins GS, Morgan JV, Melosh HJ, Schenk PMet al., 2014,

    Hydrocode simulation of Ganymede and Europa cratering trends - How thick is Europa's crust?

    , ICARUS, Vol: 231, Pages: 394-406, ISSN: 0019-1035
  • Journal article
    Larner F, Gulson B, McCall M, Oytam Y, Rehkaemper Met al., 2014,

    An inter-laboratory comparison of high precision stable isotope ratio measurements for nanoparticle tracing in biological samples

    , JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, Vol: 29, Pages: 471-477, ISSN: 0267-9477
  • Journal article
    Hettmann K, Marks MAW, Kreissig K, Zack T, Wenzel T, Rehkaemper M, Jacob DE, Markl Get al., 2014,

    The geochemistry of Tl and its isotopes during magmatic and hydrothermal processes: The peralkaline Ilimaussaq complex, southwest Greenland

    , CHEMICAL GEOLOGY, Vol: 366, Pages: 1-13, ISSN: 0009-2541
  • Conference paper
    Almeida TP, Muxworthy AR, Williiams W, Kasama T, Dunin-Borkowski Ret al., 2014,

    Hydrothermal synthesis, off-axis electron holography and magnetic properties of Fe3O4 nanoparticles

  • Journal article
    Fraser WT, Watson JS, Sephton MA, Lomax BH, Harrington G, Gosling WD, Self Set al., 2014,

    Changes in spore chemistry and appearance with increasing maturity

    , Review of Palaeobotany and Palynology, Vol: 201, Pages: 41-46, ISSN: 0034-6667
  • Journal article
    Neal WD, Appleby-Thomas GJ, Collins GS, 2014,

    Meso-scopic deformation in brittle granular materials

    , 18TH APS-SCCM AND 24TH AIRAPT, PTS 1-19, Vol: 500, ISSN: 1742-6588
  • Conference paper
    Roberts O, Muxworthy AR, Mac Niocaill C, Døssing Aet al., 2014,

    High-latitude paleomagnetic and Ar-Ar study of 0-6 Ma lavas from eastern Iceland: Contribution to the time-averaged field initiative (poster)

    , Magnetic Interactions
  • Conference paper
    Lam C, Muxworthy AR, Green D, 2014,

    Determining the magnetic signature of London’s air pollution (poster)

    , Magnetic Interactions
  • Conference paper
    Emmerton S, Muxworthy AR, 2014,

    Correlating biodegradation to magnetisation in oil bearing sedimentary rocks (poster)

    , Magnetic Interactions
  • Conference paper
    Almeida T, Kasama TP, Muxworthy AR, Williams W, Dunin-Borkowski REet al., 2014,

    Oxidation of pseudo-single domain Fe3O4 particles and associated magnetic response examined by complementary environmental TEM, off-axis electron holography, Mössbauer spectroscopy and SuperSTEM analysis

    , Magnetic Interactions
  • Conference paper
    Shah J, Muxworthy AR, Matzka J, Leonhardt L, Leitner Met al., 2014,

    Palaeomagnetic evidence for the persistence of the South-Atlantic geomagnetic anomaly

    , Magnetic Interactions
  • Conference paper
    Emmerton S, Muxworthy AR, Sephton MA, 2014,

    Dating hydrocarbon seeps – the Mupe Bay Mystery (poster)

    , Magnetic Interactions
  • Conference paper
    Montgomery W, Sephton MA, Watson J, Zeng Het al., 2014,

    The Effects Of Minerals On Heavy Oil And Bitumen Chemistry When Recovered Using Steam-assisted Methods

    , SPE Heavy Oil Conference-Canada

    The production of gaseous sulfur-containing species during the steam-assisted recovery of heavy oil and bitumen have important consequences for both economics and safety. Factors such as the effects of mineral matrices require laboratory data to produce accurate models. To study mineral effects on gas production we studied a well-characterized oil-containing core and the isolated crude oil from that core. The samples were run at 250-300°C in the continued presence of liquid water for 24 hours. The reaction products of all experiments include gases, oil flotate, oil sinkate, water-soluble products, and water- insoluble residues. All reaction products were studied with a variety of analytical techniques, including FTIR spectroscopy, chromatographic fractionation (SARA analysis), GC-MS, pyrolysis GCMS and GC-FPD/TCD. These techniques were applied to whole oil, maltenes and asphaltene fractions. Physical properties including viscosity and density were also measured. Our data provide insights into the physical and chemical consequences of steam assisted recovery of heavy oils and bituments from sedimentary rock reservoirs and reveal that geological and geochemical context is an essential consideration.

  • Journal article
    Almeida TP, Muxworthy A, Williams W, Kasama T, Dunin-Borkowski Ret al., 2014,

    Magnetic characterization of synthetic titanomagnetites: Quantifying the recording fidelity of ideal synthetic analogues

    , Geochemistry Geophysics Geosystems, Vol: 15, Pages: 161-175

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