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Publications
2012
- DeBond N, Oakes RL, Paytan A & Wortmann UG (2012): Early Aptian carbon and sulphur isotope signatures at ODP Site 765. Isotopes in Environmental and Health Studies, 48(1):180-194.
- Li L, Lollar BS, Li H, Wortmann UG & Lacrampe-Couloume G (2012): Ammonium stability and nitrogen isotope fractionations for NH4+-NH3 (aq)-NH3 (gas) systems at 20-70 °C and pH of 2-13: Applications to habitability and nitrogen cycling in low-temperature hydrothermal systems. Geochimica et Cosmochimica Acta, 84(0):280 - 296.
2011
- 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.
- 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.
2009
- 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.
2008
- Groecke D & Wortmann U (ed.) (2008): Investigating climates, environments and biology using stable isotopes. Elsevier, vol. 266. Palaeogeography, Palaeoclimatology Palaeoecolog, Special Volume.
- Malinverno A, Kastner M, Torres ME & Wortmann UG (2008): Gas hydrate occurrence from pore water chlorinity and downhole logs in a transect across the northern Cascadia margin (Integrated Ocean Drilling Program Expedition 311). Journal of Geophysical Research, 113.
- Torres ME, Trhu AM, Cespedes N, Kastner M, Wortmann UG, Kim JH, Long P, Malinverno A, Pohlman JW, Riedel M & Collett T (2008): Methane hydrate formation in turbidite sediments of northern Cascadia, IODP Expedition 311. Earth and Planetary Science Letters, 271:170 - 180.
2007
- Chernyavsky BM & Wortmann UG (2007): REMAP: A reaction transport model for isotope ratio calculations in porous media. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS, 8:Q02009.
- 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.
2006
- Riedel M, Collett T, Malone M, Akiba F, Blanc-Valleron M, Ellis M, Guerin G, Hashimoto Y, Heuer V, Higashi Y, Holland M, Jackson P, Kaneko M, Kastner M, Kim JH, Kitajima H, Long P, Malinverno A, Palekar GM, Pohlman J, Schultheiss P, Teichert B, Torres M, Tr\'ehu A, Wang J, Wortmann U & Yoshioka H (2006): Gas Hydrate Transect Across Northern Cascadia Margin. EOS, 87(33):325–330.
- Wortmann UG (2006): A 300 m long depth profile of metabolic activity of sulfate-reducing bacteria in the continental margin sediments of South Australia (ODP Site 1130) derived from inverse reaction-transport modeling. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS, 7:Q05012.
2004
- Bottcher ME, Khim BK, Suzuki A, Gehre M, Wortmann UG & Brumsack HJ (2004): Microbial sulfate reduction in deep sediments of the Southwest Pacific (ODP Leg 181, Sites 1119-1125): evidence from stable sulfur isotope fractionation and pore water modeling. MARINE GEOLOGY, 205:249–260.
- 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.
2001
- Mitterer RM, Malone MJ, Goodfriend GA, Swart PK, Wortmann UG, Logan GA, Feary DA & Hine AC (2001): Co-generation of hydrogen sulfide and methane in marine carbonate sediments. GEOPHYSICAL RESEARCH LETTERS, 28:3931–3934.
- 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, Weissert H, Funk H & Hauck J (2001): Alpine plate kinematics revisited: The Adria problem. TECTONICS, 20:134–147.
2000
- Feary DA, Hine AC & M. J. Malone ea (2000): Great Australian Bight: Cenozoic Cool-Water Carbonates. Proc. ODP, Init. Repts., 182.
- Feary DA, Hine AC & Malone MJ (2000): Proceedings of the Ocean Drilling Programm, Initial Reports Leg 182. Ocean Drilling Program, CD-ROM, College Station, Texas.
- James NP, Feary DA, Surlyk F, Simo JA, Betzler C, Holbourn AE, Li Q, Matsuda H, Machiyama H, Brooks GR, Andres MS, Malone AC & Party OL (2000): Quaternary bryozoan reef mounds in cool-water, upper slope environments: Great Australian Bight. Geology, 28(7):647–650.
- Swart PK, Wortmann UG, Mitterer RM, Malone MJ, Smart PL, Feary DA & Hine AC (2000): Hydrogen sulfide-rich hydrates and saline fluids in the continental margin of South Australia. GEOLOGY, 28:1039–1042.
- Wortmann UG & Weissert H (2000): Tying platform drowning to perturbations of the global carbon cycle with a delta C-13(Org)-curve from the Valanginian of DSDP Site 416. TERRA NOVA, 12:289–294.
1999
- Feary D, Hine A, Malone M & Party L1 (1999): Cool-water 'reefs', possible hydrogen sulphide/methane clathrates, and brine circulation – Preliminary results of Leg 182 Drilling in the Great Australian Bight. JOIDES Journal, 25(2):4–7.
- Malone MJ, Swart PK, Wortmann UG, Feary DA & Hine AC (1999): Concurrent production of methane and hydrogen sulfide in continental margin sediments of the Great Australian Bight. EOS, Transactions, American Geophysical Union, 80(49):292. - 2000 Ocean Sciences Meeting supplement.
- 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.
1996
- Wortmann UG (1996): Zur Ursache der hemipelagischen schwarz/grün Zyklen im Apt/Alb der bayerischen Flyschzone. - PhD thesis, Lehrstuhl für Allg., Ang. und Ing. Geol., TU–München, Germany.
1995
- Schlegel R, Wortmann UG, Krawinkel H & Winsemann J (1995): Architecture and facies associations of Plio-Pleistocene trench-slope deposits, Burica Peninsula, Central-America. In: Pickering, K. T. and Hiscott, R. N. and Kenyon, N. H. and Ricci-Lucchi, F. and Smith, R. D. A. (ed.): Atlas of Deep Water Environments: Architectural style in turbidite systems, pp. 63–65, Chapman & Hall.