Palaeoclimate; Burial Diagenesis; Clumped isotopes; Sedimentary basins; Jurassic; Stable Isotopes; Calcite
Looser N., Madritsch H., Guillong M., Laurent O., Wohlwend S., Bernasconi S. M. (2021), Absolute Age and Temperature Constraints on Deformation Along the Basal Décollement of the Jura Fold‐and‐Thrust Belt From Carbonate U‐Pb Dating and Clumped Isotopes, in Tectonics
, 40(3), e2020TC006.
Bernasconi S.M., DaÃ«ron M., Bergmann K.D., Bonifacie M., Meckler A.N., Affek H.P., Anderson N., Bajnai D., Barkan E., Beverly E., Blamart D., Burgener L., Calmels D., Chaduteau C., Clog M., Davidheiser-Kroll B., Davies A., Dux F., Eiler J., Elliott B., Fetrow A. C., Fiebig J., Goldberg S., Hermoso M., Huntington K.W., Hyland E., Ingalls M., Jaggi M., John C.M., Jost A. B., Katz S., Kelson J., Kluge T., Kocken I.J., Laskar A., Leutert T.J., Liang D., Lucarelli J., Mackey T. J., Mangenot X., Meinicke N., Modestou S.E., MÃ¼ller I.A., Murray S., Neary A., Packard N., Passey B.H., Pelletier E., Petersen S., Piasecki A., Schauer A., Snell K.E., Swart P.K., Tripati A., Upadhyay D., Vennemann T., Winkelstern I., Yarian D., Yoshida N., Zhang N., Ziegler M. (2021), InterCarb: A community effort to improve inter‐laboratory standardization of the carbonate clumped isotope thermometer using carbonate standards, in Geochemistry, Geophysics, Geosystems
, in press, 1-16.
Fernandez Alvaro, Korte Christoph, Ullmann Clemens V., Looser Nathan, Wohlwend Stephan, Bernasconi Stefano M. (2021), Reconstructing the magnitude of Early Toarcian (Jurassic) warming using the reordered clumped isotope compositions of belemnites, in Geochimica et Cosmochimica Acta
, 293, 308-327.
Dijk Joep van, Fernandez Alvaro, Bernasconi Stefano M., Rugenstein Jeremy K. Caves, Passey Simon R., White Tim (2020), Spatial pattern of super-greenhouse warmth controlled by elevated specific humidity, in Nature Geoscience
, 13(11), 739-744.
Vickers Madeleine L., Lengger Sabine K., Bernasconi Stefano M., Thibault Nicolas, Schultz Bo Pagh, Fernandez Alvaro, Ullmann Clemens V., McCormack Paul, Bjerrum Christian J., Rasmussen Jan Audun, Hougård Iben Winther, Korte Christoph (2020), Cold spells in the Nordic Seas during the early Eocene Greenhouse, in Nature Communications
, 11, 4713.
van Dijk J., Fernandez A., Storck J.C., White T.S., Lever M., Müller I.A., Bishop S., Seifert R.F., Driese S.G., Krylov A., Ludvigson G.A., Turchyn A.V., Lin C.Y., Wittkop C., Bernasconi S.M. (2019), Experimental calibration of clumped isotopes in siderite between 8.5 and 62 °C and its application as paleo-thermometer in paleosols, in Geochimica et Cosmochimica Acta
, 254, 1-20.
Bernasconi Stefano M., Müller Inigo A., Bergmann Kristin D., Breitenbach Sebastian F. M., Fernandez Alvaro, Hodell David A., Jaggi Madalina, Meckler Anna Nele, Millan Isabel, Ziegler Martin (2018), Reducing Uncertainties in Carbonate Clumped Isotope Analysis Through Consistent Carbonate-Based Standardization, in Geochemistry, Geophysics, Geosystems
, 19(9), 2895-2914.
Rodriguez-Sanz L., Bernasconi S. M., Marino G., Heslop D., Mueller I. A., Fernandez A., Grant K. M., Rohling E. J. (2017), Penultimate deglacial warming across the Mediterranean Sea revealed by clumped isotopes in foraminifera, in SCIENTIFIC REPORTS
, 7, 1-11.
Mueller Inigo A., Fernandez Alvaro, Radke Jens, van Dijk Joep, Bowen Devon, Schwieters Johannes, Bernasconi Stefano M. (2017), Carbonate clumped isotope analyses with the long-integration dual-inlet (LIDI) workflow: scratching at the lower sample weight boundaries, in RAPID COMMUNICATIONS IN MASS SPECTROMETRY
, 31(12), 1057-1066.
Fernandez Alvaro, Müller Inigo A., Rodríguez-Sanz Laura, van Dijk Joep, Looser Nathan, Bernasconi Stefano M. (2017), A Reassessment of the Precision of Carbonate Clumped Isotope Measurements: Implications for Calibrations and Paleoclimate Reconstructions, in Geochemistry, Geophysics, Geosystems
The clumped isotope thermometer in carbonates, is based on the measurement of the abundance of 13C-18O bonds in their mineral lattice. Unlike the classic oxygen isotope thermometer this method is independent of the composition of the water from which a mineral is formed. Therefore, it does not require assumptions of the composition of the water, which is commonly the largest source of uncertainty when reconstructing deep-time paleoclimates and diagenetic processes. With this project we will improve the methodology for the analysis 13C-18O bonds in carbonates (expressed the parameter ?47), in order to reduce sample sizes necessary to less than 1 mg of sample for a temperature estimate with an error smaller than ±1°C. A second goal is to develop the measurement protocols to determine the abundance of the isotopologue 12C18O18O in carbonates and to calibrate its temperature-dependence for the first time. Both the reduction in sample size and the measurement of the 12C18O18O isotopologue are possible thanks to the new ThermoFisher 253 Plus Mass spectrometer that was recently installed in our laboratory and which we are further developing in close collaboration with the manufacturer. The combination of a mass spectrometer with the new collector array with 1013 Ohm resistors for the rare isotopologues, and a new Kiel-IV preparation device is unique and will allow a much more efficient measurement workflow and the analysis of smaller samples. We will apply the new methodologies to samples that are not amenable to analysis with the current analytical systems. We will apply this new technology to two case studies: (A) Reconstruction of Jurassic climate change and oxygen isotope composition of seawater through the analysis of well-preserved fossils with a broad latitudinal range, and (B) Constraining the burial history and the cementation and dolomitisation history of Mesozoic formations in the Geneva basin by analyzing carbonate veins and cements. This second project will provide new temperature constraints to improve the modeling of the burial history of this sedimentary basin. In addition, it will help to better evaluate its potential for developing deep geothermal energy resources, which is the goal of a large ongoing project funded by the state of Geneva. Summarizing, the proposed project will be bring a significant improvement of the analytical techniques broadening the application of this method to new questions in earth sciences.