Prof Hugh Jenkyns

Professor of Stratigraphy

Research Theme
Environment, oceans and climate

ResearcHugh J profile pictureh Area
Stratigraphy and sedimentology

Telephone: +44 1865 272 023
Email: hughj@earth.ox.ac.uk


Research Profile
My research is concerned primarily with the palaeoceanography and palaeoclimatology of Jurassic and Cretaceous marine sediments. Areas of study include northern and southern Europe and the Pacific Ocean. My approach has been to elucidate the causality of major global events in Earth history by examining their sedimentary and geochemical records. To this end, I have studied the distribution, in time and space, of sediments unusually rich in organic carbon as well as the stratigraphic distribution of oxygen, carbon, nitrogen and strontium isotopes in rocks and fossils. I am also interested in the preservation of climatic signals in marine and continental sediments. Specific research topics include the causes and consequences of Oceanic Anoxic Events, particularly those of the early Toarcian (183Ma), the early Aptian (120Ma) and the Cenomanian-Turonian boundary (93Ma). This latter interval was apparently characterized by the highest global palaeotemperatures of the last 115Ma, represented a huge disturbance of the carbon cycle, and was a major turning point in the climatic history of the Earth. I have also been involved in a multidisciplinary study of the type Kimmeridge Clay, through the Kimmeridge Drilling Project. In addition, I have  investigated the origin of north Pacific guyots – drowned carbonate platforms capping volcanic seamounts – which we believe were formed as a result of suppression of shallow-water carbonate production as northward plate movement pushed the edifices into peri-equatorial waters whose surface temperatures were >30 degrees C. Tropical waters were simply too hot for many carbonate-secreting organisms to survive. Platform drowning can thus be related to the thermal maximum of the mid- to Late Cretaceous greenhouse earth. Cretaceous palaeoclimates in high latitudes are another interest, with the postulated high temperatures – at times in excess of 20 degrees C – posing a fundamental problem in understanding how heat was transported across the globe. Currently I am exploring the use of novel isotope systems (Fe, S, Cr) in Mesozoic palaeoceanography, and investigating the impact of Oceanic Anoxic Events on marine environments in the Southern Hemisphere.


Teaching Profile
My teaching involves sedimentology primarily at second-year level.


Selected Publications (Extended Publications)

Percival, L.M.E., Witt, M.L.I., Mather, T.A., Hermoso, M., Jenkyns, H.C., Hesselbo, S.P., Al-Suwaidi, A.H., Storm, M., Xu, W. & Ruhl, M. (2015). Globally enhanced mercury deposition during the end-Pliensbachian extinction and Toarcian OAE: A link to the Karoo–Ferrar Large Igneous Province. Earth planet. Sci. Letts, 428, 267–280.

Erba, E., Duncan, R.A., Bottini, C., Tiraboschi, D., Weissert, H., Jenkyns, H.C. & Malinverno, A. (2015). Environmental consequences of Ontong Java Plateau and Kerquelen Plateau volcanism. In: Neal, C.R., Sager, W.W., Sano, T. & Erba, E., Eds, The Origin, Evolution, and environmental Consequences of oceanic Large Igneous Provinces, Geol. Soc. Am. Spec. Paper, 511, 271–303.

Gambacorta, G., Jenkyns, H.C., Russo, F., Tsikos, H., Wilson, P.A., Faucher, G. & Erba, E. (2015). Carbon- and oxygen-isotope records of mid-Cretaceous Tethyan pelagic sequences from the Umbria–Marche and Belluno Basins (Italy). Newsletters Stratigr., 48, 299–323.

Zhou, X., Jenkyns, H.C., Owens, J.D., Junium, C.K., Zheng, X.-Y., Sageman, B.B., Hardisty, D.S., Lyons, T.W., Ridgwell, A. & Lu, Z. (2015). Upper ocean oxygenation dynamics from I/Ca ratios during the Cenomanian–Turonian OAE 2. Paleoceanography, 30, 510–526.

Bottini, C., Erba, E., Tiraboschi, D., Jenkyns, H.C., Schouten, S. & Sinninghe Damsté, J.S. (2015). Climate variability and ocean fertility during the Aptian Stage. Clim. Past, 11, 383–402.

Blättler, C.L., Stanley, S.M., Henderson, G.M. & Jenkyns, H.C. (2014). Identifying vital effects in Halimeda algae with Ca isotopes. Biogeosciences, 11, 7207–7217.

Li, X., Jenkyns, H.C., Zhang, C., Wang, Y., Liu, L & Cao, K. (2014). Carbon isotope signatures of pedogenic carbonates from SE China: rapid atmospheric pCO2 changes during middle–late Early Cretaceous time. Geol. Mag., 151, 830–849.

Kennedy, W.J., Gale, A.S., Huber, B.T., Petrizzo, M.R., Bown, P. & Jenkyns, H.C (2014). Integrated stratigraphy across the Aptian/Albian boundary at Col de Pre-Guittard (southeast France): a candidate Global Boundary Stratotype Section. Cretaceous Research, 51, 248–259.

Franceschi, M., Dal Corso, J., Posenato, R., Roghi, G., Masetti, D & Jenkyns, H.C. (2014). Early Pliensbachian (Early Jurassic) C-isotope perturbation and the diffusion of the Lithiotis fauna: Insights from the western Tethys. Palaeogeogr. Palaeoclimatol. Palaeoecol., 410, 255–263.

Dal Corso, J., Marzoli, A., Tateo, F., Jenkyns, H.C., Bertrand, H., Youbi, N., Mahmoudi, A., Font, E., Buratti, N. & Cirilli, S. (2014). The dawn of CAMP volcanism and its bearing on the end-Triassic carbon cycle disruption. J. Geol. Soc. Lond., 171, 153–164.

Kafousia, N., Karakitsios, V., Mattioli, E., Kenjo, S. & Jenkyns, H.C. (2014). The Toarcian Oceanic Anoxic Event in the Ionian Zone, Greece. Palaeogeogr. Palaeoclimatol. Palaeoecol., 393, 135–145.

Owens, J.D., Gill, B.C., Jenkyns, H.C., Bates, S.M., Severmann, D., Kuypers, M.M.M., Woodfine, R.G. & Lyons, T.W. (2013). Sulfur isotopes track the global extent and dynamics of euxinia during Cretaceous Oceanic Anoxic Event 2. Proc. Nat. Acad. Sci., 110, 18407–18412.

Dal Corso, J., Roghi, G., Ragazzi, E., Angelini, I., Giaretta, A., Soriano, C., Declòs, X. & Jenkyns, H.C. (2013). Physico-chemical analysis of Albian (Lower Cretaceous) amber from San Just (Spain): palaeoenvironmental and palaeoecological studies. Geol. Acta, 11, 359–370.

Sabatino, N., Vlahović, I., Jenkyns, H.C., Scopelliti, G., Neri, R., Prtoljan, B. & Velić, I. (2013). Carbon-isotope record and palaeoenvironmental changes during the early Toarcian oceanic anoxic event in shallow-marine carbonates of the Adriatic carbonate platform in Croatia. Geol. Mag., 150, 1085–1102.

Zheng, X.-Y., Jenkyns, H.C., Gale, A.S., Ward, D.J. & Henderson, G.M. (2013). Changing ocean circulation and hydrothermal inputs during Ocean Anoxic Event 2 (Cenomanian–Turonian): Evidence from Nd-isotopes in the European shelf sea. Earth planet. Sci. Letts, 375, 338–348.

Pogge von Strandmann, P.A.E., Jenkyns, H.C. & Woodfine, R.G. (2013). Lithium isotope evidence for enhanced weathering during Oceanic Anoxic Event 2.  Nature Geosci., 6, 668–672.

Jenkyns, H.C & Weedon, G.P. (2013). Chemostratigraphy (CaCO3, TOC, δ13Corg) of Sinemurian (Lower Jurassic) black shales from the Wessex Basin, Dorset and palaeoenvironmental implications. Newsletters Stratigr., 46, 1-21.

Bottini, C., Cohen, A.S., Erba, E., Jenkyns, H.C. & Coe, A.L. 2012. Osmium-isotope evidence for volcanism, weathering, and ocean mixing during early Aptian OAE 1a. Geology, 40, 583–586; doi: 10.1130/G33140.1

Hermoso, M., Minoletti, F., Rickaby, R.E.M., Hesselbo, S.P., Baudin, F. & Jenkyns, H.C. 2012. Dynamics of a stepped carbon-isotope excursion: Ultra high-resolution study of Early Toarcian environmental change. Earth and Planetary Science Letters, 319/320, 45–54; doi: 10.1016/j.epsl.2011.12.021

Petrizzo, M.R., Huber, B.T., Gale, A.S., Barchetta, A. & Jenkyns, H.C. 2012. Abrupt planktic foraminiferal turnover across the Niveau Kilian at Col de Pré-Guittard (Vocontian Basin, southeast France): new criteria for defining the Aptian/Albian boundary. Newsletters on Stratigraphy, 45, 55–74; doi: 10.1127/0078-0421/2012/0013

Blättler, C.L., Jenkyns, H.C., Reynard, L.M. & Henderson, G.M. 2011. Significant increases in global weathering during Oceanic Anoxic Events 1a and 2 indicated by calcium isotopes. Earth and Planetary Science Letters, 309, 77–88; doi: 10.1016/j.epsl.2011.06.029

Gill, B.C., Lyons, T.W. & Jenkyns, H.C. 2011. A global perturbation in the sulfur cycle during the Toarcian Oceanic Anoxic Event. Earth and Planetary Science Letters, 312, 484–496; doi: 10.1016/j.epsl.2011.10.030

Jarvis, I., Lignum, J.S., Gröcke, D.R., Jenkyns, H.C. & Pearce, M.A. 2011. Black shale deposition, atmospheric CO2 drawdown, and cooling during the Cenomanian-Turonian Oceanic Anoxic Event. Paleoceanography, 26, PA3201, doi: 10.1029/2010PA002081

Kafousia, N., Karakitsios, V., Jenkyns, H.C. & Mattioli, E. 2011. A global event with a regional character: the Early Toarcian Oceanic Anoxic Event in the Pindos Ocean (northern Peloponnese, Greece). Geological Magazine, 148, 619–631; doi: 10.1017/S0016756811000082

Nielsen, S.G., Goff, M., Hesselbo, S.P., Jenkyns, H.C., LaRowe, D.E. & Lee, C.A. 2011. Thallium isotopes in early diagenetic pyrite – a paleoredox proxy? Geochimica et Cosmochimica Acta, 75, 6690-6704; doi: 10.1016/j.gca.2011.07.047

Sabatino, N., Neri, R., Bellanca, A., Jenkyns, H.C., & Masetti, D. 2011. Petrography and high-resolution geochemical records of Lower Jurassic manganese-rich deposits from Monte Mangart, Julian Alps. Palaeogeography, Palaeoclimatology, Palaeoecology, 299, 97–109; doi: 10.1016/j.palaeo.2010.10.039

Al-Suwaidi, A.H., Angelozzi, G.N., Baudin, F., Damborenea, S.E., Hesselbo, S.P., Jenkyns, H.C., Mancenido, M.O., & Riccardi, A.C. 2010. First record of the Early Toarcian Oceanic Anoxic Event from the Southern Hemisphere, Neuquén Basin, Argentina. Journal of the Geological Society, 167, 633–636; doi: 10.1144/0016-76492010-025

Hermoso, M., Minoletti, F., Le Callonnec, L., Jenkyns, H.C., Hesselbo, S.P., Rickaby, R.E.R., Renard, M., de Rafelis, M. & Emmanuel, L. 2009. Global and local forcing of Early Toarcian seawater chemistry: A compartive study of different paleoceanographic settings (Paris and Lusitanian Basins). Paleoceanography, 24, PA4208, doi: 10.1029/2009PA001764

Jenkyns, H.C. 2010. Geochemistry of Oceanic Anoxic Events. Geochemistry Geophysics Geosystems, 11, doi: 10.1029/2009GC002788

Littler, K., Hesselbo, S.P. & Jenkyns, H.C. 2010. A carbon-isotope perturbation at the Pliensbachian–Toarcian boundary: evidence from the Lias Group, NE England. Geological Magazine, 147, 181–192; doi: 10.1017/S0016756809990458

Lu, Z., Jenkyns, H.C. & Rickaby, R.E.R. 2010. Iodine to calcium ratios in marine carbonate as a paleo-redox proxy during oceanic anoxic events. Geology, 38, 1107–1110; doi: 10.1130/G31145.1

Korte, C., Hesselbo, S.P., Jenkyns, H.C., Rickaby, R.E.M. and Spötl, C., 2009. Palaeoenvironmental significance of carbon- and oxygen-isotope stratigraphy of marine Triassic–Jurassic boundary sections in SW Britain. Journal of the Geological Society, 166, 431–445; doi: 10.1144/0016-76492007-177

Sabatino, N., Neri, R., Bellanca, A., Jenkyns, H.C., Baudin, F., Parisi, G. & Masetti, D. 2009. Carbon-isotope records of the Early Jurassic (Toarcian) oceanic anoxic event from the Valdorbia (Umbria–Marche Apennines) and Monte Mangart (Julian Alps) sections: palaeoceanographic and stratigraphic implications. Sedimentology, 56, 1307–1328; doi: 10.1111/j.1365-3091.2008.01035.x

Tiraboschi, D., Erba, E. & Jenkyns, H.C. 2009. Origin of rhythmic Albian black shales (Piobbico core, central Italy): Calcareous nannofossil quantitative and statistical analyses and paleoceanographic reconstructions. Paleoceanography, 24, PA2222, doi: 10.1029/2008PA001670

Parente, M., Frijia, J., Di Lucia, M., Jenkyns, H.C., Woodfine, R.G. and Baroncini, F. 2008. Stepwise extinction of larger foraminifers at the Cenomanian-Turonian boundary: A shallow-water perspective on nutrient fluctuations during Oceanic Anoxic Event 2 (Bonarelli Event). Geology, 36, 715–718; doi: 10.1130/G24893A.1

Scopelliti, G., Bellanca, A., Erba, E., Jenkyns, H.C., Neri, R., Tamagnini, P., Luciani, V. and Masetti, D. 2008. Cenomanian-Turonian carbonate and organic-carbon isotope records, biostratigraphy and provenance of a key section in NE Sicily, Italy: Palaeoceanographic and palaeogeographic implications. Palaeogeography, Palaeoclimatology, Palaeoecology, 265, 59–77; doi: 10.1016/j.palaeo.2008.04.022

Woodfine, R.G., Jenkyns, H.C., Sarti, M., Baroncini, F. and Violante, C., 2008. The response of two Tethyan carbonate platforms to the early Toarcian (Jurassic) ocean anoxic event: environmental change and differential subsidence. Sedimentology, 55, 1011–1028; doi: 10.1111/j.1365-3091.2007.00934.x