Paleoceanography; (Bio-)stratigraphy; Oceanic anoxic events; Geochemistry; Briançonnais; Cretaceous; Paleogeography; Sedimentology; Paleoecology; Alpine Tethys
Charbonnier Guillaume, Duchamp-Alphonse Stéphanie, Deconinck Jean-François, Adatte Thierry, Spangenberg Jorge E., Colin Christophe, Föllmi Karl B. (2020), A global palaeoclimatic reconstruction for the Valanginian based on clay mineralogical and geochemical data, in Earth-Science Reviews
, 202, 103092-103092.
Charbonnier Guillaume, Adatte Thierry, Föllmi Karl B., Suan Guillaume (2020), Effect of Intense Weathering and Postdepositional Degradation of Organic Matter on Hg/TOC Proxy in Organic‐rich Sediments and its Implicationsfor Deep‐Time Investigations, in Geochemistry, Geophysics, Geosystems
, 21(2), 1-19.
Adatte Thierry, Bond David P.G., Keller Gerta, Charbonnier* Guillaume, Adatte Thierry, Duchamp-Alphonse Stéphanie, Spangenberg Jorge E., Föllmi Karl B. (2020), Global mercury enrichment in Valanginian sediments supports a volcanic trigger for the Weissert episode, Geological Society of America, USA, 85-103.
Charbonnier Guillaume, Adatte Thierry, Spangenberg Jorge E., Föllmi Karl B. (2018), The expression of early Aptian to latest Cenomanian oceanic anoxic events in the sedimentary record of the Briançonnais domain, in Global and Planetary Change
, 170, 76-92.
Charbonnier Guillaume, Boulila Slah, Spangenberg Jorge E., Adatte Thierry, Föllmi Karl B., Laskar Jacques (2018), Obliquity pacing of the hydrological cycle during the Oceanic Anoxic Event 2, in Earth and Planetary Science Letters
, 499, 266-277.
Charbonnier Guillaume, Godet Alexis, Bodin Stéphane, Adatte Thierry, Föllmi Karl B. (2018), Mercury anomalies, volcanic pulses, and drowning episodes along the northern Tethyan margin during the latest Hauterivian-earliest Aptian, in Palaeogeography, Palaeoclimatology, Palaeoecology
, 505, 337-350.
Charbonnier Guillaume, Morales Chloé, Duchamp-Alphonse Stéphanie, Westermann Stéphane, Adatte Thierry, Föllmi Karl B. (2017), Mercury enrichment indicates volcanic triggering of Valanginian environmental change, in Scientific Reports
, 7(1), 40808-40808.
With this proposal we ask for funding with the intention to expand on an ongoing project on Cretaceous sediments of the Briançonnais domain. With Dr. Guillaume Charbonnier, we started six months ago a one-year project financed by the University of Lausanne on the geochemistry and sedimentology of the section of Roter Sattel in the Subbriançonnais of the Préalpes fribourgoises, which can be considered a key section through the upper Lower and lower Upper Cretaceous for this realm. This section provides us with the rare opportunity to trace the evolution of six consecutive oceanic anoxic episodes (OAEs), which span the time interval between the latest Barremian and the early Turonian. The funding requested here would allow us to continue this research and at the same time to include further sections, which would allow us to broaden our knowledge on the paleoenvironment and paleoceanography of the Briançonnais domain and to better understand the evolution of this enigmatic microcontinent - which is an important element in paleogeographic reconstructions of the western Alpine Tethys.The approach used so far and proposed here includes an important field component with the study and high-resolution sampling of representative outcrops through the Cretaceous sedimentary cover of the Briançonnais. The samples will be analyzed for their microfacies, mineralogy, carbon and oxygen isotope records, and major and trace elements including phosphorus, mercury and those considered redox-sensitive (e.g., Mo, Co, V, U). The data will be used to reconstruct the onset and evolution of the “mid”-Cretaceous OAEs and their expression both in open-marine, deeper waters (preservation of partly anoxic, organic-rich sediments), as well as in shallow waters (presence of condensed phosphorites, stromatolites). Subsequently, the data will be compared to those of the “classical” OAE sites in Italy, France, Great Britain, and elsewhere.The data and interpretations to be expected from this project will also in a more general way contribute to a better understanding of this time interval in Earth history, which provides a particularly interesting window on an Earth in major change: the late Early to early Late Cretaceous harbors a series of OAEs, which are unique for the entire Mesozoic and Cenozoic in terms of their density and intensity. The associated changes in climate and the environment were quite dramatic and impacted marine and terrestrial life. Expressions of the most important OAE’s are exceptionally well preserved in the Briançonnais and their study has the potential to deepen our knowledge on these particular episodes and the response of the Earth system to them.