Post-Doctoral Research Associate, Isotope Geoscience
Telephone: 01355 270161
I am currently working on a Science and Technology Facilities Council (STFC) funded project titled “Follow the water: Insights into the Martian hydrosphere from the nakhlites”.
My current role involves examining the extra-terrestrial formation of alteration minerals within the nakhlites. The nature of these hydrous mineral assemblages provides an opportunity to gain key insights into the past martian fluid reservoirs (hydrosphere) and potentially the ancient atmosphere of Mars.
The project combines and expands on previous investigations (with a new radioisotopic dating program and geochemical characterization of the alteration veins) using new state of the art instrumentation such as Computed Tomography (CT), NanoSIMS and a new high-sensitivity, high resolution multicollector noble gas mass spectrometer (HELIX-SFT) for Ar/Ar dating.
- High-precision 40Ar/39Ar geochronology of the nakhlite Martian meteorites.
- Martian analogue studies (Isle of Arran, Svalbard).
- Computed Tomography combined with petrographic analyses of Martian meteorites.
- High-precision isotope measurements (δD, δ18O, δ13C; NanoSIMS) of Martian alteration minerals.
Recent Publications and Abstracts
- T Tomkinson, M R Lee, D F Mark, C L Smith. (2013). Sequestration of Martian CO2 by mineral carbonation. Nature communications. (Accepted).
- S D Wolters, J K Hagene, A T Sund, A Bohman, W Guthery, B T Sund, A Hagermann, T Tomkinson, J Romstedt, G H Morgan, M M Grady. (2013). WatSen: Design and testing of a prototype mid-IR spectrometer and microscope package for Mars exploration. Experimental Astronomy. (available online) DOI: 10.1007/s10686-012-9328-8.
- T Tomkinson, M R Lee, D F Mark, C L Smith. (2013). A Replacive Origin for Secondary Mineral Veins in the Nakhlite Meteorite Lafayette. 76th Annual Meteoritical Society Meeting, Edmonton, Canada. Abstract no 5066.
- T Tomkinson, M R Lee, D F Mark, I A Franchi, C L Smith. (2013). Provence of Water in Martian Meteorites: D/H Ratios of Lafayette Using NanoSIMS. 76th Annual Meteoritical Society Meeting, Edmonton, Canada. Abstract no 5101.
- T Tomkinson, M R Lee, D F Mark, I A Franchi, C L Smith. (2013). Evidence for Multiphase Aqueous Alteration of the Yamato 00 Nakhlites. 76th Annual Meteoritical Society Meeting, Edmonton, Canada. Abstract no 5102.
- T Tomkinson, M R Lee, D F Mark, F M Stuart and C L Smith. (2013). The Nakhlite Meteorites Provide Evidence for Mineralization of Martian CO2 by Carbonation of Silicates. 44th Lunar and Planetary Science Conference, abstract no. 1208, Houston.
- T Tomkinson, M R Lee, D F Mark, F M Stuart and C L Smith. (2013). Quantifying the Timescales of Fluid-Rock Interaction on Mars Using the Nakhlite Meteorites. 44th Lunar and Planetary Science Conference, abstract no. 1206, Houston.
- M R Lee, T Tomkinson, D F Mark, C L Smith and F M Stuart. (2013). Evidence for silicate dissolution on Mars from the Nakhla meteorite. Meteoritics and Planetary Science. 48, 224–240.
- A W Needham, R L Abel, T Tomkinson, M M Grady. (2012). Martian subsurface fluid pathways and 3D mineralogy of the Nakhla meteorite. Geochimica et Cosmochimica Acta. 116, 96–110.
- T Tomkinson, M R Lee, D F Mark and F M Stuart. (2012). Terrestrial organic and inorganic contamination of the NWA 5790 nakhlite. Meteoritics & Planetary Science, 47: A5248.
- T Tomkinson, M R Lee, D F Mark, F M Stuart and C L Smith. (2012). Shock enhanced dissolution of olivine in the martian crust – evidence from the Nakhla meteorite. Meteoritics & Planetary Science, 47: A380.
- P Lindgren, M R Lee, K J Dobson, R D Hanna and T Tomkinson. (2012). Understanding the deformation history of Murchison (CM2): Clues from calcite twin stress analysis and high resolution X-ray computed tomography. Meteoritics & Planetary Science, 47: A5280.
- M M Grady, M M Daswani, S P Schwenzer, T Tomkinson, I A Franchi, I P Wright. (2012). Formation Environment of Noachian-Age Alteration Assemblages as Inferred from Secondary Minerals in ALH 84001. Third Conference on Early Mars. Abstract no. 7086.