Dolomite; Stable Isotopes; Sedimentary basins; Calcite; Contact Metamorphism; Burial Diagenesis; Clumped isotopes
Müller Inigo A., Rodriguez-Blanco Juan D., Storck Julian-Christopher, do Nascimento Gabriela Santilli, Bontognali Tomaso R.R., Vasconcelos Crisogono, Benning Liane G., Bernasconi Stefano M. (2019), Calibration of the oxygen and clumped isotope thermometers for (proto-)dolomite based on synthetic and natural carbonates, in Chemical Geology
, 525, 1-17.
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.
Breitenbach Sebastian F.M., Mleneck-Vautravers Maryline J., Grauel Anna-Lena, Lo Li, Bernasconi Stefano M., Müller Inigo A., Rolfe James, Gázquez Fernando, Greaves Mervyn, Hodell David A. (2018), Coupled Mg/Ca and clumped isotope analyses of foraminifera provide consistent water temperatures, in Geochimica et Cosmochimica Acta
, 236, 283-296.
van Dijk joep, Fernandez Alvaro, Müller Inigo A., Lever Marc, Bernasconi Stefano M. (2018), Oxygen isotope fractionation in the siderite-water system between 8.5 and 62 °C., in Geochimica et Cosmochimica Acta
, 220, 535-551.
Rodriguez-Sanz Laura, Bernasconi Stefano, Marino Gianluca, Heslop D., Müller Inigo a., Fernandez Alvaro, Grant K.M., Rohling Eelco J. (2017), Penultimate deglacial warming across the Mediterranean Sea revealed by clumped isotopes in foraminifera, in Scientific reports
, 7(16572), 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.
Muller Inigo A., Violay Marie E. S., Storck Julian-Christopher, Fernandez Alvaro, van Dijk Joep, Madonna Claudio, Bernasconi Stefano M. (2017), Clumped isotope fractionation during phosphoric acid digestion of carbonates at 70 degrees C, in CHEMICAL GEOLOGY
, 449, 1-14.
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
Millan M.I., Machel H.G., Bernasconi S.M. (2016), Constraining temperatures of formation and composition of dolomitizing fluids in the upper devonian nisku formation (Alberta, Canada) with clumped isotopes, in Journal of Sedimentary Research
, 86(2), 107-112.
Fernandez A., van Dijk J., Müller I.A., Bernasconi S.M. (2016), Siderite acid fractionation factors for sealed and open vessel digestions at 70 °C and 100 °C, in Chemical Geology
, 444, 180-186.
This proposal is the continuation of project No. 200021_143485/1 that financed a post doctoral fellow for 2 years. The goals of the first project were 1) to provide a calibration of the carbonate clumped isotope thermometer with natural and synthetic carbonates and 2) to assess the potential and limitations of the method with two case studies: a) the Pozalagua hydrothermal dolomite system in Spain and b) the Nisku dolomites in central Alberta, Canada. In the first phase of the project we could develop 3 new temperature calibrations in the range of 3 to 95°C and demonstrate with the case studies that clumped isotope signatures in dolomites still record the original lower T signatures in spite of reaching burial diagenetic temperatures of up to 200°C. In addition we greatly improved the methodology for carbonate clumped isotope measurements leading to a reduction in sample size and improved precision. The goal of this continuation project is to extend the range of the temperature calibration to 200°C, where there are still no published studies. We will measure samples of calcite and dolomite that are already being synthesized in the laboratory at Leeds University at temperature between 60 and 200°C. This will cover a gap in temperature calibrations, and help resolve uncertainties in the application of burial isotope processes. In addition we will synthesize and analyse carbonates at T exceeding 1000°C to obtain a random isotope distribution, in order to precisely determine the phosphoric acid fractionation factor at 70°C. A second goal of the project is to further reduce the sample size necessary for a measurement to less than one milligram and increase the sample throughput. This will be accomplished by implementing a new measurement protocol we have developed in our laboratory to the Kiel-IV preparation system. Finally, we will conduct three case studies of progressive metamorphism in carbonates from contact-metamorphic aureoles. We will study aureole of the Monte Capanne pluton (Elba Island), the Campiglia Marittima intrusion (Tuscany) and the Monzoni intrusion (Dolomites) to determine the kinetics of 13C-18O bond-reordering in calcite and dolomite along the temperature gradient. This will allow evaluating the kinetics of clumped isotope reordering for calcite and dolomite and determine the closure temperature for the carbonate clumped isotope thermometer based on examples with well-constrained temperature histories. Finally these studies, will allow to explore the potential of clumped isotopes in carbonates to better constrain temperatures during contact metamorphism, deep burial diagenesis and low-grade metamorphism. These are important steps in understanding the history of sedimentary basins and heat transport in contact metamorphic aureoles.