Dr Alex Dickson

Alex profilePost Doctoral Research Associate

Research interests

I am a paleoceanographer and geochemist interested in studying the interactions between ocean chemistry and global environmental changes. I have worked across many intervals of geological time from the Quaternary to the Mesozoic, which have typically been linked by their association with warm global climate conditions.

Current research

As part of the Oxford-Shell metal isotopes project I will be working on the application of novel tracers (molybdenum, cadmium and zinc isotopes) to shallow-marine sediments that span recognized periods of widespread organic carbon burial. The ultimate aim will be to link the shallow-marine data to deeper basin settings in order to quantify the presence of environmental conditions, such as seawater redox and biogenic productivity, which contribute to the preservation of organic source rocks.   A particular focus of the work will be on the Oceanic Anoxic Events (OAEs) that occurred throughout the Mesozoic.

Selected publications

Scaife, J.D., Ruhl, M., Dickson, A.J., Mather, T.A., Jenkyns, H.C., Percival, L.M.E., Hesselbo, S.P., Cartwright, J., Eldrett, J.S., Bergman, S.C., Minisini, D., Sedimentary mercury enrichments as a marker for submarine Large Igneous Province volcanism? Evidence from the Mid-Cenomanian Event and Oceanic Anoxic Event 2 (Late Cretaceous).  Geochemistry, Geophysics, Geosystems, In Press.

Dickson, A.J., Gill, B.C., Ruhl, M., Jenkyns, H.C., Porcelli, D., Idiz, E., Lyons, T.W, van den Boorn, S. (2017) Molybdenum-isotope chemostratigraphy and paleoceanography of the Toarcian Oceanic Anoxic Event (Early Jurassic).     Paleoceanography, , 32, 813–829  doi:10.1002/2016PA003048.

Dickson, A.J., Saker-Clark, M., Jenkyns, H.C., Bottini, C., Erba, E., Russo, F., Gorbanenko, O., Naafs, B.D.A., Pancost, R.D., Robinson, S.A., van den Boorn, S.H.J.M. and Idiz, E. (2017) A Southern Hemisphere record of global trace-metal drawdown and orbital modulation of organic-matter burial across the Cenomanian–Turonian boundary (Ocean Drilling Program Site 1138, Kerguelen Plateau) Sedimentology 64, 186–203, doi: 10.1111/sed.12303

Dickson, A.J., Cohen, A.S., Coe, A.L., Davies, M., Shcherbinina, E. and Gavrilov, Y. (2015), Evidence for weathering and volcanism during the PETM from Arctic Ocean and Peri-Tethys osmium isotope records. Palaeogeography, Palaeoclimatology, Palaeoecology 438, 300-307.

Jenkyns, H.C., Dickson, A.J., Ruhl, M. and van den Boorn, S.H.J.M (2017) Basalt–seawater interaction, the Plenus Cold Event, enhanced weathering and geochemical change: deconstructing Oceanic Anoxic Event 2 (Cenomanian–Turonian, Late Cretaceous). Sedimentology, 64, 16-43, doi: 10.1111/sed.12305

Maslin, M.A. and  Dickson, A.J. (2015), O-isotopes. In Encyclopedia of Marine Geosciences, edited by Jan Harff, Martin Meschede, Sven Petersen and Jörn Thiede. Springer Sciences, Dorcrecht. Doi:10.1007/978-94-007-6644-0_81-1.

Dickson, A.J., Cohen, A.S. and Coe, A.L. (2014), Continental margin molybdenum isotope signatures from the early Eocene. Earth and Planetary Science Letters 404, 389-395.

Aze, T., Pearson, P., Dickson, A.J., Bown, P.R., Badger, M., Pancost, R.D., Gibbs, S.J., Huber, B.T., Leng, M.J., Coe, A.L., Cohen, A.S. and Foster, G. (2014), Extreme warming of tropical waters during the Paleocene – Eocene Thermal Maximum. Geology 42, 739-742.

Dickson, A.J., Rees-Owen, R., März, C., Coe, A.L., Cohen, A.S., Pancost, R.D., Taylor, K. and Shcherbinina, E. (2014), The spread of marine anoxia on the Northern Tethys margin during the Paleocene-Eocene Thermal Maximum. Paleoceanography 29, 471-488.

Hesselbo, S.P., Bjerrum, C.J., Hinnov, L.A., MacNiocaill, C., Riding, J.B., van de Schootbrugge, B. and the Mochras Revisited Science Team (2013), Mochras borehole revisited: a new global standard for Early Jurassic earth history. Scientific Drilling 16, 81-91.

Dickson, A.J. and Cohen, A.S. (2012), A molybdenum isotope record of Eocene Thermal Maximum 2: implications for early Eocene seawater redox. Paleoceanography 27, PA3230, doi:10.1029/2012PA002346.

Dickson, A.J., Cohen, A.S. and Coe, A.L. (2012), Seawater oxygenation during the Paleocene-Eocene Thermal Maximum. Geology 40, doi:10.1130/G32977.1.

Dickson, A.J., Leng, M.J., Maslin, M.A. and Röhl, U. (2010), Oceanic, atmospheric and ice-sheet forcing of South East Atlantic Ocean productivity and South African monsoon intensity during MIS-12 to 10. Quaternary Science Reviews 29, 3936-3947.

Dickson, A.J., Leng, M.J., Maslin, M.A., Green, J., Sloane, H.J., Bendle, J.A., McClymont, E.L., and Pancost, R.D. (2010), Meridional overturning and Agulhas Leakage influences of South East Atlantic upper ocean hydrography during Marine Isotope Stage 11. Paleoceanography, doi:10.1029/2009PA001830.

Dickson, A.J., Beer, C.J., Dempsey, C., Bendle, J.A., Maslin, M.A., McClymont, E.L., and Pancost, R.D. (2009), Oceanic forcing of the Marine Isotope Stage 11 interglacial. Nature Geoscience 2, doi:10.1038/ngeo527.

Dickson, A.J., Leng, M.J., and Maslin, M.A. (2008), Mid-depth South Atlantic ocean circulation and chemical stratification during MIS-10 to 12: implications for atmospheric CO2. Climate of the Past 4, 333-344.

Dickson, A.J., Austin, W.E.N., Maslin, M.A., Hall, I.R., and Kucera, M. (2008), Centennial-scale evolution of Dansgaard-Oeschger events in the northeast Atlantic Ocean between 39.5-56.5 ka BP. Paleoceanography, PA3206, doi:10.1029/2008PA001595.