Verteilte automatische Leistungsanalyse für Parallelrechnersysteme
Zusammenfassung der Projektergebnisse
The Triassic-Jurassic boundary mass-extinction event (T-J; 201.2 Ma) is increasingly being linked to the degassing of the Central Atlantic Magmatic Province, one of the largest flood basalt provinces of the Phanerozoic. Particularly the role of exhalated CO2 and SO2 remains to be elucidated. Previously, elevated pCOs has been inferred from two pronounced negative C-isotope excursions occurring in bulk organic matter in the boundary interval in several sections in Europe. However, a large positive organic C-isotope excursion marks the lowermost Jurassic in British Columbia. A pilot study was initiated in collaboration with Jonathan Payne (Stanford University) and Adam Tomasovych (Chicago University) to investigate TJ boundary sections in the Southern Alps (Italy) and the Tatra Mountains (Slovakia). The aim was to generate high-resolution C-isotope records from bulk carbonate to determine perturbations of the carbon cycle prior to and following the extinction event. Particularly, attention was paid to finding evidence for a biocaicification crisis. Furthermore, carbonate C-isotope records were compared with new organic C-isotope data from the Mingolsheim core in Germany for which also detailed palynological records were available. Our high-resolution carbonate C-isotope record from Italy shows a large positive C-isotope excursion in the lowermost Hettangian that supports elevated PCO2 as a result of CAMP volcanism. The excursion occurs in an interval dominated by microbial limestones that appears to reflect strong fluctuations in carbonate chemistry and supersaturation state of the oceans during the Hettangian. Combined palynological and C-isotope data from Mingolsheim suggest that organic-C-isotope data need to be viewed with care, because bulk organic Cisotopes may be strongly controled by compositional changes.
Projektbezogene Publikationen (Auswahl)
- van de Schootbrugge, B., Quan, T.M., Lindström, S., Pross, J., Fiebig, J., Petschick, R., Püttmann, W., Rosenthal, Y., Falkowski, P.G., (2007). Terrestrial acidification and sudden end-Triassic "Waldsterben". European Geoscience Union, Vienna, Austria. presentation.
- Lindström, S., Dybkjaer, K., van de Schootbrugge, B., (2008). Correlation between marine and terrestrial events across the Triassic-Jurassic boundary. In the Danish Basin International Geological Congress, Oslo, Non/vay.presentation.
- van de Schootbrugge, B., Quan, T.M., Lindslröm, S., Heunisch, C, Rohling, H.-G., Pross, J., Fiebig, J., Richoz, S., Püttmann, W., Rosenthal, Y., Falkowski, P.G., (2008). Acid rain and the demise of terrestrial ecosystems at the Triassic-Jurassic boundary. Workshop Triassic Climates, Bolzano, Italy.presentation.
- Godderis, Y., Donnadieu, Y., de Vargas, C, Pierrehumbert, R.T., Dromart, G., & van de Schootbrugge, B. (2008): Causal or casual link between the rise of nannoplankton calcification and a tectonically-driven massive fall of atmospheric CO2? Earth and Planetary Science Letters 267, 247-255.
- Heunisch, C, Lindström, S., Dybkjasr, K., van de Schootbrugge, B., (2008). Palynological investigation of marine and terrestrial biotic change across the Triassic- Jurassic boundary in NW Europe, International Palynological and Paleobotanical Conference, Bonn, Germany. presentation.
- Payne, J.L., van de Schootbrugge, B. (2007). Ocean life in the Triassic: Links between benthic and planktonic recovery and radiation. In: Falkowski, P.G., Knoll, A.H. (Eds.), Evolution of Primary Producers in the Sea, Elsevier, Amsterdam, p. 165-189.
- Quan, T.M., van de Schootbrugge, B., Field, P.M., Rosenthal, Y. & Falkowski, P.G., (2008). Nitrogen isotope and trace metal analyses from the Mingolsheim core (Germany): Evidence for redox variations across the Triassic-Jurassic boundary. Global Biogeochemical Cycles, 22, GB2014 (Siehe online unter: doi:10.1029/2007GB002981)
- Quan, T.M., van de Schootbrugge, B., Rosenthal, Y., Falkowski, P.O., (2006). Geochemical evidence for redox variations across the Triassic-Jurassic boundary in the Tethys sea. Geological Society of America Annual Meeting, 22-25 Oct, Philadelphia, USA. presentation.
- S. Richoz, van de Schootbrugge. B.. Heunisch, C, Püttmann, W., Quan, T.M., Fiebig, J. Pross, J., (2008). Repeated Photic Zone Euxinia after the Triassic-Jurassic mass extinction event. Geological Society of America Annual Meeting, 5-10 Oct, Houston, USA.presentation.
- van de Schootbrugge, B., Payne, J.L., Tomasovych, A., Pross, J., Fiebig, J., Benbrahim, M., Föllmi, K.B., & Quan, T.M. (2008) Carbon cycle perturbation and stabilisation in the wake of the Triassic-Jurassic boundary mass-extinction event. Geochemistry Geophysics Geosystems.
- van de Schootbrugge, B., Tremolada, F., Rosenthal, Y., Bailey, T.R., Feist-Burkhardt, S., Brinkhuis, H., Pross, J., Kent, D.V. & Falkowski, P.G., 2007: End-Triassic calcification crisis and blooms of organic-walled "disaster species". Palaeogeography, Palaeoclimatology, Palaeoecology 244, 126-141.
