Currently browsing: Items authored or edited by Mark Sephton

Chan, Queenie H. S.; Watson, Jonathan S.; Sephton, Mark A.; O'Brien, Áine C. and Hallis, Lydia J. (2024). The amino acid and polycyclic aromatic hydrocarbon compositions of the promptly recovered CM2 Winchcombe carbonaceous chondrite. Meteoritics & Planetary Science, 59(5) pp. 1101–1130.

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Sephton, Mark A.; Chan, Queenie H. S.; Watson, Jonathan S.; Burchell, Mark J.; Spathis, Vassilia; Grady, Monica M; Verchovsky, Alexander B.; Abernethy, Feargus A. J. and Franchi, Ian A. (2024). Insoluble macromolecular organic matter in the Winchcombe meteorite. Meteoritics & Planetary Science, 59(5) pp. 1131–1144.

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Sephton, Mark; James, Rachael H.; Fehr, Manuela; Bland, Philip and Gounelle, Matthieu (2013). Lithium isotopes as indicators of meteorite parent body alteration. Meteoritics & Planetary Science, 48(5) pp. 872–878.

Verchovsky, A. B.; Pearson, V. K.; Fisenko, A. V.; Semenova, L .F.; Sephton, M. A. and Wright, I. P. (2012). Separation of Q from carbon in CR meteorites during stepped combustion. In: 43rd Lunar and Planetary Science Conference, 19-23 Mar 2012, The Woodlands, TX, US.

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Lomax, Barry H.; Fraser, Wesley T.; Harrington, Guy; Blackmore, Stephen; Sephton, Mark A. and Harris, Nigel B. W. (2012). A novel palaeoaltimetry proxy based on spore and pollen wall chemistry. Earth and Planetary Science Letters, 353 pp. 22–28.

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Fehr, M.; James, R.; Sephton, M.; Martins, Z. and Bland, P. A. (2009). Primitive lithium isotope signatures in CR carbonaceous chondrites? In: 19th V.M. Goldschmidt Conference, 21-26 Jun 2009, Davos, Switzerland.

Preston, L. J.; Benedix, G. K.; Genge, M. J. and Sephton, M. K. (2008). A multidisciplinary study of silica sinter deposits with applications to silica identification and detection of fossil life on Mars. Icarus, 198(2) pp. 331–350.

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Martins, Zita; Botta, Oliver; Fogel, Marilyn L.; Sephton, Mark A.; Glavin, Daniel P.; Watson, Jonathan S.; Dworkin, Jason P.; Schwartz, Alan W. and Ehrenfreund, Pascale (2008). Extraterrestrial nucleobases in the Murchison meteorite. Earth and Planetary Science Letters, 270(1-2) pp. 130–136.

Court, Richard; Sephton, Mark; Parnell, J. and Gilmour, Iain (2007). Raman spectroscopy of irradiated organic matter. Geochimica et Cosmochimica Acta, 71(10) pp. 2547–2568.

Watson, Jonathan S.; Sephton, Mark A.; Sephton, Sarah V.; Self, Stephen; Fraser, Wesley T.; Lomax, Barry H.; Gilmour, Iain; Wellman, Charles H. and Beerling, David J. (2007). Rapid determination of spore chemistry using thermochemolysis gas chromatography-mass spectrometry and micro-Fourier transform infrared spectroscopy. Photochemical and Photobiological Sciences, 6 pp. 689–694.

Martins, Z.; Botta, O.; Fogel, M. L.; Sephton, M. A.; Glavin, D. P.; Watson, J. S.; Dworkin, J. P.; Schwartz, A. W. and Ehrenfreund, P. (2006). Isotopic analysis of nucleobases in the Murchison meteorite. In: 69th Annual Meeting of the Meteoritical Society, 6-11 Aug 2006, Zurich, Switzerland.

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Sephton, Mark A.; Looy, Cindy V.; Brinkhuis, Henk; Wignall, Paul B.; de Leeuw, Jan W. and Visscher, Henk (2005). Catastrophic soil erosion during the end-Permian biotic crisis. Geology, 33(12) pp. 941–944.

Sephton, M.; Love, G. D.; Meredith, W; Snape, C. E.; Sun, C. G. and Watson, J. (2005). Hydropyrolysis: A new technique for the analysis of macromolecular material in meteorites. Planetary and Space Science, 53(12) pp. 1280–1286.

Verchovsky, Sasha and Sephton, Mark (2005). A noble record. Astronomy & Geophysics, 46(2) pp. 12–14.

Sephton, M. A.; Looy, C. V.; Visscher, H.; Brinkhuis, H. and de Leeuw, J. W. (2005). The combined petrographic and chemical analysis of end-Permian kerogens. In: Koeberl, Christian and Henkel, Herbert eds. Impact Tectonics. Impact Studies. Springer, pp. 467–478.

Watson, J. S.; Sephton, M. A. and Gilmour, I. (2005). Macromolecular organic acids in the Murchison meteorite. In: 36th Lunar and Planetary Science Conference, 14-18 Mar 2006, Houston, Texas, USA.

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Court, R. W.; Sephton, M. A.; Parnell, J. and Gilmour, I. (2005). The combustion characteristics and stable carbon isotopic compositions of irradiated organic matter: implications for terrestrial and extraterrestrial sample analysis. In: 36th Lunar and Planetary Science Conference, 14-18 Mar 2005, Houston, Texas, USA.

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Sephton, M. A.; Meredith, W.; Sun, C. G. and Snape, C. E. (2005). Hydropyrolysis as a preparative method for the compound-specific carbon isotope analysis of fatty acids. Rapid Communications in Mass Spectrometry, 19(3) pp. 323–325.

Sephton, Mark and Gilmour, Iain (2004). Compound specific isotope analysis of the organic constituents in the Murchison meteorite. In: de Groot, P.A. ed. Handbook of Stable Isotope Analytical Techniques, 1, Volume 1. Amsterdam: Elsevier, pp. 201–227.

Sephton, Mark A.; Verchovsky, Alexander B. and Wright, Ian P. (2004). Carbon and nitrogen isotope ratios in meteoritic organic matter: indicators of alteration processes on the parent asteroid. International Journal of Astrobiology, 3(3) pp. 221–227.

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Sephton, M.A.; Love, G.D.; Watson, J.S.; Verchovsky, A.B.; Wright, I.P.; Snape, C.E. and Gilmour, I. (2004). Hydropyrolysis of insoluble carbonaceous matter in the Murchison meteorite: new insights into its macromolecular structure. Geochimica et Cosmochimica Acta, 68(6) pp. 1385–1393.

Gilmour, Iain and Sephton, Mark eds. (2004). An Introduction to Astrobiology. Cambridge: Cambridge University Press.

Sephton, M.A.; Verchovsky, A.B.; Bland, P.A.; Gilmour, I.; Grady, M.M. and Wright, I.P. (2003). Investigating the variations in carbon and nitrogen isotopes in carbonaceous chondrites. Geochimica et Cosmochimica Acta, 67(11) pp. 2093–2108.

Sephton, M. A.; Love, G. D.; Watson, J. S.; Verchovsky, A. B.; Wright, I. P.; Snape, C. E. and Gilmour, I (2003). Hydropyrolysis of high molecular weight organic matter in Murchison. In: 34th Lunar and Planetary Science Conference, 17-21 Mar 2003, Houston, Texas, USA.

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Sephton, Mark A.; Amor, Ken; Franchi, Ian A.; Wignall, Paul B.; Newton, Robert and Zonneveld, John-Paul (2002). Carbon and nitrogen isotope disturbances and an end-Norian (Late Triassic) extinction event. Geology, 30(12) pp. 1119–1122.

Pearson, V. K.; Sephton, M. A. and Gilmour, I. (2002). Organic indicators of alteration in the CR chondrites. In: 33rd Lunar and Planetary Science Conference, 11-15 Mar 2002, Houston, Texas, USA.

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Verchovsky, A. B.; Gilmour, J. D.; Holland, G.; Sephton, M. A.; Wright, I. P. and Franchi, I. A. (2002). Search for Q: single grains Xe isotope analysis of carbonaceous residue from Yilmia. In: 33rd Lunar and Planetary Science Conference, 11-15 Mar 2002, Houston, Texas, USA.

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Gilmour, I.; Hill, H. G. M.; Pearson, V.K.; Sephton, M.A and Nuth, J. A. (2002). Production of high molecular weight organic compounds on the surfaces of amorphous iron silicate catalysts: Implications for organic synthesis in the solar nebula. In: 33rd Lunar and Planetary Science Conference, 11-15 Mar 2002, Houston, Texas, USA.

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Pearson, V. J.; Kearsley, A. T.; Sephton, M. A. and Gilmour, I. (2002). Organic-inorganic spatial relationships in carbonaceous chondrites. In: 33rd Lunar and Planetary Science Conference, 11-15 Mar 2002, Houston, Texas, USA.

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Butterworth, A. L.; Sephton, M. A. and Gilmour, I. (2001). Dual isotopic composition of methane in Murchison meteorite. In: 32nd Lunar and Planetary Science Conference, 12-16 Mar 2001, Houston, Texas, USA.

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Verchovsky, Sasha; Sephton, Mark; Wright, Ian and Pillinger, Colin (2001). Separation of Q-Noble gas carrier from bulk carbon in enstatite chondrites by stepped combustion. In: 32nd Lunar and Planetary Science Conference, 12-16 Mar 2001, Houston, Texas, USA.

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Pearson, V. K; Sephton, M. A. and Gilmour, I. (2001). The macromolecular constitution of the CR chondrites. In: 64th Annual Meeting of the Meteoritical Society, 10-14 Sep 2001, Vatican City, Italy.

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Pearson, V. K.; Sephton, M. A.; Bland, P. A.; Franchi, I. A. and Gilmour, I. (2001). The association between organic matter and clay minerals in carbonaceous chondrites. In: 64th Annual Meeting of the Meteoritical Society, 10-14 Sep 2001, Vatican City, Italy.

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Gilmour, I.; Pearson, V. K. and Sephton, M. A. (2001). Analysis of Tagish Lake macromolecular organic material. In: 32nd Lunar and Planetary Science Conference, 12-16 Mar 2001, Houston, Texas, USA.

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Gilmour, I.; Sephton, M.A. and Pearson, V. K. (2001). The Tagish Lake chondrite and the interstellar parent body hypothesis. In: 32nd Lunar and Planetary Science Conference, 12-16 Mar 2001, Houston, Texas, USA.

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Pearson, V. K.; Sephton, M. A.; Gilmour, I. and Franchi, I. A. (2001). Hydrogen isotopic composition of the Tagish Lake meteorite: comparison with other carbonaceous chondrites. In: 32nd Lunar and Planetary Science Conference, 12-16 Mar 2001, Houston, Texas, USA.

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Verchovsky, A. B.; Sephton, M. A.; Wright, I. P. and Pillinger, C. T. (2001). Attempts to separate the Q-noble gas carrier in Yilmia. In: 64th Annual Meeting of the Meteoritical Society, 10-14 Sep 2001, Vatican City, Italy.

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