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  • Journal article
    Fehr MA, Rehkaemper M, Halliday AN, Hattendorf B, Guenther Det al., 2009,

    Tellurium isotope compositions of calcium-aluminum-rich inclusions

    , METEORITICS & PLANETARY SCIENCE, Vol: 44, Pages: 971-984, ISSN: 1086-9379
  • Conference paper
    Collins GS, Wuennemann K, 2009,

    NUMERICAL MODELING OF IMPACT EJECTION PROCESSES IN POROUS GEOLOGIC MATERIALS

    , 72nd Annual Meeting of the Meteoritical-Society, Publisher: METEORITICAL SOC, Pages: A53-A53, ISSN: 1086-9379
  • Conference paper
    Ciesla FJ, Collins GS, Davison TM, O'Brien DPet al., 2009,

    Collisions among porous planetesimals and the water content of planetary embryos

    , 19th Annual VM Goldschmidt Conference, Publisher: Elsevier, Pages: A227-A227, ISSN: 0016-7037
  • Journal article
    Artemieva N, Morgan J, 2009,

    Modeling the formation of the K-P boundary layer

    , Icarus, Vol: 201, Pages: 768-780, ISSN: 0019-1035
  • Conference paper
    Baker RGA, Rehkamper M, Schonbachler M, Benedix GKet al., 2009,

    Thallium isotope evidence for protracted cooling of the acapulcoite-lodranite parent body

    , 19th Annual VM Goldschmidt Conference, Publisher: PERGAMON-ELSEVIER SCIENCE LTD, Pages: A77-A77, ISSN: 0016-7037
  • Conference paper
    Coggon RM, Rehkamper M, Atteck C, Teagle DAHet al., 2009,

    Constraints on hydrothermal fluid fluxes from Tl geochemistry

    , 19th Annual VM Goldschmidt Conference, Publisher: PERGAMON-ELSEVIER SCIENCE LTD, Pages: A234-A234, ISSN: 0016-7037
  • Conference paper
    Fehr MA, James RH, Sephton MA, Martins Z, Bland PAet al., 2009,

    Primitive lithium isotope signatures in CR carbonaceous chondrites?

    , 19th Annual VM Goldschmidt Conference, Publisher: PERGAMON-ELSEVIER SCIENCE LTD, Pages: A359-A359, ISSN: 0016-7037
  • Conference paper
    Schonbachler M, Rehkamper M, Williams HM, Halliday ANet al., 2009,

    The cadmium isotope composition of the Earth

    , 19th Annual VM Goldschmidt Conference, Publisher: PERGAMON-ELSEVIER SCIENCE LTD, Pages: A1183-A1183, ISSN: 0016-7037
  • Conference paper
    Andreasen R, Schonbachler M, Rehkamper M, 2009,

    The <SUP>205</SUP>Pb-<SUP>205</SUP>TI and Cd isotope systematics of ordinary chondrites

    , 19th Annual VM Goldschmidt Conference, Publisher: PERGAMON-ELSEVIER SCIENCE LTD, Pages: A43-A43, ISSN: 0016-7037
  • Conference paper
    Xue Z, Rehkamper M, Statham PJ, 2009,

    A new methodology for precise cadmium isotope analyses of seawater

    , 19th Annual VM Goldschmidt Conference, Publisher: PERGAMON-ELSEVIER SCIENCE LTD, Pages: A1467-A1467, ISSN: 0016-7037
  • Conference paper
    Rehkamper M, Baker RGA, Wood BJ, 2009,

    Tl isotope constraints on the origin of the Earth's Pb paradox

    , 19th Annual VM Goldschmidt Conference, Publisher: PERGAMON-ELSEVIER SCIENCE LTD, Pages: A1082-A1082, ISSN: 0016-7037
  • Journal article
    Ham DA, Farrell PE, Gorman GJ, Maddison JR, Wilson CR, Kramer SC, Shipton J, Collins GS, Cotter CJ, Piggott MDet al., 2009,

    Spud 1.0: generalising and automating the user interfaces of scientific computer models

    , Geoscientific Model Development, Vol: 2, Pages: 33-42

    The interfaces by which users specify the scenarios to be simulated by scientific computer models are frequently primitive, under-documented and ad-hoc text files which make using the model in question difficult and error-prone and significantly increase the development cost of the model. In this paper, we present a model-independent system, Spud, which formalises the specification of model input formats in terms of formal grammars. This is combined with an automated graphical user interface which guides users to create valid model inputs based on the grammar provided, and a generic options reading module, libspud, which minimises the development cost of adding model options. Together, this provides a user friendly, well documented, self validating user interface which is applicable to a wide range of scientific models and which minimises the developer input required to maintain and extend the model interface.
  • Journal article
    Krasa D, Wilkinson CDW, Gadegaard N, Kong X, Zhou H, Roberts AP, Muxworthy AR, Williams Wet al., 2009,

    Nanofabrication of two-dimensional arrays of magnetite particles for fundamental rock magnetic studies

    , JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, Vol: 114, ISSN: 2169-9313
  • Conference paper
    Barron LL, Wiliams W, Muxworthy AR, 2009,

    Effect of Nanoscale Intergrowths on Palaeomagnetic Interpretations (poster)

    , Magnetic Exchanges
  • Conference paper
    Muxworthy AR, Heslop D, Paterson GA, Emmerton Set al., 2009,

    Deriving absolute palaeointensities from FORC diagrams

    , Magnetic Exchanges
  • Conference paper
    Paterson GA, Muxworthy AR, Roberts AP, Mac Niocaill Cet al., 2009,

    Investigating the use of Pyroclastics for Palaeointensity Determinations (poster)

    , Magnetic Exchanges
  • Journal article
    Peeters Z, Quinn R, Martins Z, Sephton MA, Becker L, van Loosdrecht MCM, Brucato J, Grunthaner F, Ehrenfreund Pet al., 2009,

    Habitability on planetary surfaces: interdisciplinary preparation phase for future Mars missions

    , INT J ASTROBIOL, Vol: 8, Pages: 301-315, ISSN: 1473-5504

    Life on Earth is one of the outcomes of the formation and evolution of our solar system and has adapted to every explored environment on planet Earth. Recent discoveries have shown that life can exist in extreme environments, such as hydrothermal vents, in deserts and in ice lakes in Antarctica. These findings challenge the definition of the ‘planetary habitable zone’. The objective of future international planetary exploration programmes is to implement a long-term plan for the robotic and human exploration of solar system bodies. Mars has been a central object of interest in the context of extraterrestrial life. The search for extinct or extant life on Mars is one of the main goals of space missions to the Red Planet during the next decade. In this paper we describe the investigation of the physical and chemical properties of Mars soil analogues collected in arid deserts. We measure the pH, redox potential and ion concentrations, as well as carbon and amino acid abundances of soils collected from the Atacama desert (Chile and Peru) and the Salten Skov sediment from Denmark. The samples show large differences in their measured properties, even when taken only several meters apart. A desert sample and the Salten Skov sediment were exposed to a simulated Mars environment to test the stability of amino acids in the soils. The presented laboratory and field studies provide limits to exobiological models, evidence on the effects of subsurface mineral matrices, support current and planned space missions and address planetary protection issues.
  • Journal article
    Court RW, Sephton MA, 2009,

    Investigating the contribution of methane produced by ablating micrometeorites to the atmosphere of Mars

    , EARTH PLAN SCI LETT, Vol: 288, Pages: 382-385, ISSN: 0012-821X

    The presence of methane in the atmosphere of Mars has been suggested as evidence of life, as methane has a short lifetime in the atmosphere of Mars of just a few hundred years, requiring replacement by mechanisms, continuous or episodic, such as biology, volcanism, serpentinization of ultramafic crust or large cometary or asteroidal impacts. The potential of meteoritic infall to deliver significant quantities of methane is restricted by the low abundance of free methane in carbonaceous meteorites. However, the delivery of meteoritic material to the surface of a planet is an energetic process, and the ability of carbonaceous meteorites to generate methane upon ablation during atmospheric entry has not been previously considered. Here, we use analytical pyrolysis to simulate the ablation and pyrolysis of carbonaceous micrometeorites upon atmospheric entry, and Fourier-transform infrared spectroscopy to quantify the subsequent yield of methane. We show that ablation produces a yield of methane that is approximately two orders of magnitude greater than the measured free methane present in the CM2 carbonaceous chondrite, Murchison, but that this previously overlooked source of methane can only account for less than 10 kg of methane annually, a mass far below that required to maintain the abundance of methane observed in the atmosphere of Mars. Our data support attempts to search for life and explore subsurface chemical processes on the Red Planet.
  • Journal article
    Ham DA, Farrell PE, Gorman GJ, Maddison JR, Wilson CR, Kramer SC, Shipton J, Collins GS, Cotter CJ, Piggott MDet al., 2009,

    Spud 1.0: generalising and automating the user interfaces of scientific computer models

    , GEOSCIENTIFIC MODEL DEVELOPMENT, Vol: 2, Pages: 33-42, ISSN: 1991-959X
  • Journal article
    Gomes RL, Meredith W, Snape CE, Sephton MAet al., 2009,

    Conjugated steroids: analytical approaches and applications

    , ANAL BIOANAL CHEM, Vol: 393, Pages: 453-458, ISSN: 1618-2642

    An introduction to conjugated steroids and the justification for their analysis is provided covering both environmental and biological samples. Determining conjugated steroids or indeed any organic chemical which is conjugated upon excretion from the body has relevance in diagnostic monitoring, forensic screening and environmental analysis (from the endocrine disrupter perspective). The various analytical approaches and the accompanying issues are application-dependent. There are numerous options at each stage of analysis, from extraction, hydrolysis, derivatisation, and detection, and advances can be confined to the specific application for which it was developed. Emphasis is placed on the choice of separation and how gas or liquid chromatography necessitates different preparative stages to enable conjugated steroid determination. Possible future directions and research for conjugated steroid analysis are discussed.

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