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Ulrich G. Wortmann

Associate Professor

University of Toronto
Department of Geology

22 Russel Str., Toronto
Ontario, Canada M5S 3B1

Tel.: 416 978 7084
Fax.: 416 978 3938
e-mail: uli_dot_wortmann at utoronto_dot_ca

My research interests straddle marine geology, paleoceanography, and geomicrobiology. I am interested in the global interplay of biology, chemistry, and physics on various timescales. Investigation of these tightly coupled systems requires a interdisciplinary approach, involving a multitude of methods. Stable isotope geochemistry and numerical modeling are versatile tools in Earth System Science, and the cornerstone of my own research. I currently serve on the council of the Centre for Global Change Science, and as the University of Toronto's Liason to the Canadian Consortium for Ocean Drilling (which represents Canada within the international IODP-Program.

Selected Publications

For a complete list of my publications click here

Wortmann UG & Chernyavsky BM (2011): The significance of isotope specific diffusion coefficients for reaction-transport models of sulfate reduction in marine sediments. Geochimica et Cosmochimica Acta, 75(11):3046 – 3056. - Doi: 10.1016/J.Gca.2011.03.007.

Eckert T, Brunner B, Edwards EA & Wortmann UG (2011): Microbially mediated re-oxidation of sulfide during dissimilatory sulfate reduction by Desulfobacter latus. Geochimica et Cosmochimica Acta, 75(12):3469 – 3485. - Doi: 10.1016/J.Gca.2011.03.034.

Williams B, Halfar J, Steneck RS, Wortmann UG, Hetzinger S, Adey W, Lebednik P & Joachimski M (2011): Twentieth century d13C variability in surface water dissolved inorganic carbon recorded by coralline algae in the northern North Pacific Ocean and the Bering Sea. Biogeosciences, 8(1):165–174.

Hetzel A, Boettcher ME, Wortmann UG & Brumsack HJ (2009): Paleo-redox conditions during OAE 2 reflected in Demerara Rise sediment geochemistry (ODP Leg 207). Palaeogeography, Palaeoclimatology, Palaeoecology, 273(3 - 4):302 - 328.

Groecke D & Wortmann U (ed.) (2008): Investigating climates, environments and biology using stable isotopes. Elsevier, vol. 266. Palaeogeography, Palaeoclimatology Palaeoecolog, Special Volume.

Wortmann UG & Chernyavsky BM (2007): Effect of evaporite deposition on Early Cretaceous carbon and sulphur cycling. NATURE, 446:654–656.

Wortmann UG, Chernyavsky B, Bernasconi SM, Brunner B, Boettcher ME & Swart PK (2007): Oxygen isotope biogeochemistry of pore water sulfate in the deep biosphere: Dominance of isotope exchange reactions with ambient water during microbial sulfate reduction (ODP Site 1130). GEOCHIMICA ET COSMOCHIMICA ACTA, 71:4221–4232.

Wortmann UG, Herrle JO & Weissert H (2004): Altered carbon cycling and coupled changes in Early Cretaceous weathering patterns: Evidence from integrated carbon isotope and sandstone records of the western Tethys. EARTH AND PLANETARY SCIENCE LETTERS, 220:69–82.

Wortmann UG, Weissert H, Funk H & Hauck J (2001): Alpine plate kinematics revisited: The Adria problem. TECTONICS, 20:134–147.

Wortmann UG, Bernasconi SM & Bottcher ME (2001): Hypersulfidic deep biosphere indicates extreme sulfur isotope fractionation during single-step microbial sulfate reduction. GEOLOGY, 29:647–650.

Wortmann UG, Hesse R & Zacher W (1999): Major-element analysis of cyclic black shales: Paleoceanographic implications for the Early Cretaceous deep western Tethys. PALEOCEANOGRAPHY, 14:525–541.

Department of Geology, University of Toronto

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Ulrich G. Wortmann

Associate Professor

Selected Publications