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Sarah Simpson

Ph.D. student, Geology and Planetary Science

Department
Job Title
(Working) Thesis Title

Stable isotope studies of post-impact aqueous alteration in the Chicxulub peak-ring, with comparison to the Ries crater, Germany.

 

My research aims to disentangle the evolution and lifetime of meteorite impact-generated hydrothermal systems recorded within terrestrial craters. My work focuses on various mid-low temperature aqueous phases such as clays, carbonates and zeolites and their associated light stable isotopes, as these tend to be the most problematic, but also ubiquitous mineralogies associated with craters on Earth and Mars. Ultimately, I hope my work will contribute to discovering environments on other rocky planets and satellites in our Solar System which might be favorable to record evidence for water and possibly extant or extinct life.

Publications

S.L. Simpson, A. J. Boyce, P. Lambert, M.R. Lee, P. Lindgren, (2017) Evidence for an impact-induced biosphere in the δ34S isotopic analysis of sulphides from the Rochechouart impact structure, France. Earth and Planetary Science Letters 460: p.192-200. doi: 10.1016/j.epsl.2016.12.023.

Cohen, B. E., Mark, D. F., Lee, M. R., Simpson, S. L., (2016) 40Ar/39Ar age of the Rochechouart impact structure: no relationship with Triassic-Jurassic boundary. Meteoritics & Planetary Science, 1–12. doi:10.1111/maps.12880.

K. E. Hattori, P. H. Kelley, G. P. Dietl, N. O. Moore, S. L. Simpson, A. M. Zappulla, K. J. Ottens, C. C. Visaggi., (2014), Validation of taxon-specific sampling by novice collectors for studying drilling predation in fossil bivalves, Palaeogeography, Paleaoclimatology, Palaeoecology, 412: p.199-207. doi: 10.1016/j.palaeo.2014.07.034.

Recent Abstracts

Preliminary characterization of hydrothermal alteration in the peak-ring of the Chicxulub impact structure, Mexico (2017) S. L. Simpson, G. R. Osinski, D. A. Kring, C. S. Cockell, and the IODP-ICDP Expedition 364 Science Party. 48th Lunar and Planetary Science Conference, The Woodlands, Texas, USA. Abstract #2207.

2016 CanMars analogue mission: Insights into the utility of X-ray fluorescence spectrometry for the identification of palaeoenvironements suitable for biosignatures preservation. (2017) S. L. Simpson, S. Duff, J. O’Callaghan, C. Caudill, G. R. Osinski. 48th Lunar and Planetary Science Conference, The Woodlands, Texas, USA. Abstract

#2176. Hallis, L. J., Simpson, S., Lee, M. R. (2016) Martian alteration in unique meteorite NWA 8159? 79th Annual Meeting of the Meteoritical Society, Berlin, Germany. Abstract #6442.

Cohen, B. E., Mark, D. E., Lee, M. R., Simpson, S. L., (2016) A revised 40Ar/39Ar age for the Rochechouart impact structure: not coincident with the Triassic-Jurassic boundary. 79th Annual Meeting of the Meteoritical Society, Berlin, Germany. Abstract #6172.

“Atoms to Galaxies” theme guest speaker (2015) “Meteorite impacts: from ashes to…microbes?” Pint of Science Festival, Glasgow, United Kingdom, May 2015.

S. L. Simpson, A. J. Boyce, P. Lambert, M. R. Lee, P. Lindgren (2015) Stable isotope studies of the Rochechouart impact structure: sources of secondary carbonates and sulphides within allochthonous and parautochthonous impactites. 46th Lunar and Planetary Science Conference, The Woodlands, Texas, USA. Abstract #1740.

S. L. Simpson, P. Lambert, M. R. Lee (2015) Evidence for high temperature hydrothermal fluid flow within the sub-crater environment of the Rochechouart impact structure: observations from a polymict breccia dike. 46th Lunar and Planetary Science Conference, The Woodlands, Texas, USA. Abstract #1751.

S. L. Simpson, M. R. Lee, P. Lindgren., (2014) Searching for life in impact structures: stable isotope geochemistry and mineralogy of post-impact hydrothermal deposits of the Rochechouart structure. Space Glasgow Research Conference Abstracts 2014.

S. L. Simpson, A. J. Boyce, M. R. Lee, P. Lindgren., (2014) Stable isotope studies of post impact hydrothermal deposits within the sub-crater environment of the Rochechouart impact structure. 77th Annual Meeting of the Meteoritical Society, Casablanca, Morocco. Abstract #5061.

Sarah L. Simpson(2014) Post-impact hydrothermal system geochemistry and mineralogy: Rochechouart impact structure, France. Geophysical Research Abstracts Vol. 16, EGU2014-5419.

S. L. Simpson, M. R. Lee and P. Lindgren, (2014) Impact-generated hydrothermal circulation and metasomatism of the Rochechouart Astrobleme: mineralogy and major and trace element distribution. 45th Lunar and Planetary Science Conference, The Woodlands, Texas, USA. Abstract #1039.

P. Lindgren, M. R. Lee and S. L. Simpson, (2014) Impact fracturing and aqueous alteration of the CM carbonaceous chondrites. 45th Lunar and Planetary Science Conference, The Woodlands, Texas, USA. Abstract #1040.

Poster: Kelley, P. H., Hattori, K. E., Moore, N. O., Simpson, S. L., Zappulla, A. M., Ottens, K., Dietl, G. P., and Visaggi, C. C. (2012) Validation of taxon-specific sampling for studying drilling predation on fossil bivalves, Geological Society of America 2012 Annual Meeting, Charlotte, North Carolina, USA. Session T142 Paper 102-2. 

Degrees Obtained

M.Sc. Earth Science (2015)
University of Glasgow
United Kingdom

Thesis title: Geochemical and mineralogical studies of meteorite impact-generated hydrothermal systems on Earth and tracing sources of water: observations from the Rochechouart impact structure, France (2015).

 

B.Sc. Geology, Minor in French Language (2012)
University of North Carolina at Wilmington
United States

Senior project: see 2014 publication “Validation of taxon-specific sampling by novice collectors for studying drilling predation in fossil bivalves.”

Awards & Scholarships

2016 NSERC CREATE Natural Sciences and Engineering Research Council Collaborative Research and Training Experience Program

2015 University of Glasgow, Geography Team Teaching Excellence Award

2015 Lunar and Planetary Institute Career Development Award

2014 Space Glasgow Research Conference best presentation Award 

2014 Planetary Studies Foundation conference travel award for the 77th Annual Meeting of the Meteoritical Society in Casablanca, Morocco

2014 Barringer Family Fund for Meteorite Impact Research

2012 Sigma Xi Scientific Research Society

2009 - 2011 Dean’s list, University of North Carolina at Wilmington