HKU Department of Earth Science
Dr. Newby, Sean
Dr. Newby, Sean
Postdoctoral Fellow
My research interests include the study of paleoceanography and Earth history, primarily focusing on oceanic oxygen content, weathering fluxes, and carbon cycling though the use of geochemistry. I am particularly interested in major evolutionary events and biotic crises throughout the geologic record (e.g., Ordovician Biodiversification Event, end-Permian extinction, Mesozoic OAEs) and how these may relate to modern climate-induced changes. My work primarily utilizes concentrations of transition metals along with light stable isotopes and metal isotopes (Li, C, N, O, S, Sr, Mo, Tl, and U). I also integrate paleontological studies, forward box modelling, and database compilation to more completely understand the impact of climatic factors on the past oceans.
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Selected Publications
- Kozik N.P., Young S.A., Newby S.M., Liu M., Chen D., Hammarlund E.U., Bond D.P.G., Them II T.R., Owens J.D. (2022). Rapid marine oxygen variability: Drivers of the Late Ordovician mass extinction. Sci. Adv. 8, 1-8.
- Chen X., Li S., Newby S. M., Lyons T. W., Wu F. and Owens J. D. (2021). Iron and manganese shuttle has no effect on sedimentary thallium and vanadium isotope signatures in Black Sea sediments. Geochim. Cosmochim. Acta 317, 218–233.
- Li Z., Cole D. B., Newby S. M., Owens J. D., Kendall B. and Reinhard C. T. (2021). New constraints on mid-Proterozoic ocean redox from stable thallium isotope systematics of black shales. Geochim. Cosmochim. Acta 315, 185–206.
- Newby S. M., Owens J. D., Schoepfer S. D. and Algeo T. J. (2021). Transient ocean oxygenation at end-Permian mass extinction onset shown by thallium isotopes. Nat. Geosci. 14, 678–683.
- Rader S. T., Gaschnig R. M., Newby S. M., Bebout G. E., Mirakian M. J. and Owens J. D. (2021). Thallium behavior during high-pressure metamorphism in the Western Alps, Europe. Chem. Geol. 579, 120349.