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The expression of Aptian to Turonian oceanic anoxic episodes in the sedimentary record of the Briançonnais in the Swiss and Chablais Préalpes

English title The expression of Aptian to Turonian oceanic anoxic episodes in the sedimentary record of the Briançonnais in the Swiss and Chablais Préalpes
Applicant Adatte Thierry
Number 168994
Funding scheme Project funding (Div. I-III)
Research institution Institut des sciences de la Terre Université de Lausanne
Institution of higher education University of Lausanne - LA
Main discipline Geochemistry
Start/End 01.01.2017 - 31.12.2019
Approved amount 342'752.00
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Keywords (10)

Paleoceanography; (Bio-)stratigraphy; Oceanic anoxic events; Geochemistry; Briançonnais; Cretaceous; Paleogeography; Sedimentology; Paleoecology; Alpine Tethys

Lay Summary (German)

Lead
Ozeanische anoxische Episoden sind als Extremereignisse der Erdgeschichte zu betrachten, während deren der Sauerstoffgehalt in den Ozeanen drastisch abnahm, organisch-reiche Sedimente abgelagert wurden, und insgesamt das marine Leben stark beeinträchtigt wurde. Diese Ereignisse gehen oft auf ausserordentliche Vulkanaktivität zurück und sind geologisch gesehen von relativ kurzer Dauer (< 1 Million Jahr). Sie sind selten in der Erdgeschichte und treten nur in der Kreide-Zeit (144-65 Millionen Jahre vor heute) gehäuft auf.
Lay summary

In den Voralpen von Fribourg und Chablais sind geologischen Aufschlüsse aus der Kreide-Zeit (Aptian bis Turonian) vorhanden, in denen die Spuren von sechs nacheinanderfolgenden ozeanischen anoxischen Ereignissen erhalten sind. Im Tiefwassersediment sind organisch-reiche Intervalle eingeschaltet, während im Flachwassersediment phosphat-reiche Schichten vorkommen. Diese Sedimente sind Teil eines ehemaligen Mikrokontinentes (Briançonnais), das zwischen Europa und Afrika lag, und das durch die Alpenbildung dem Europäischen Kontinent einverleibt wurde. Das Ziel dieses Projektes ist es, diese Sedimente zu beproben und sedimentologisch und geochemisch zu analysieren, um den Ablauf der einzelnen ozeanischen anoxischen Episoden besser zu verstehen. Die geochemischen Analysen beinhalten die stabile Isotopie, sowie die Gehälte des organischen Materials, des Phosphors und der redox-sensitiven Spurenelemente (V, U, Mo, Co).

Das Ziel dieses Projektes ist es, ein besseres Verständnis der Reaktionsweisen der Biogeosphäre auf Extremereignisse und der damit verbundenen Rückkopplungsprozesse zu erhalten. 

Direct link to Lay Summary Last update: 26.09.2016

Responsible applicant and co-applicants

Employees

Publications

Publication
A global palaeoclimatic reconstruction for the Valanginian based on clay mineralogical and geochemical data
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.
Effect of Intense Weathering and Postdepositional Degradation of Organic Matter on Hg/TOC Proxy in Organic‐rich Sediments and its Implicationsfor Deep‐Time Investigations
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.
Global mercury enrichment in Valanginian sediments supports a volcanic trigger for the Weissert episode
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.
The expression of early Aptian to latest Cenomanian oceanic anoxic events in the sedimentary record of the Briançonnais domain
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.
Obliquity pacing of the hydrological cycle during the Oceanic Anoxic Event 2
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.
Mercury anomalies, volcanic pulses, and drowning episodes along the northern Tethyan margin during the latest Hauterivian-earliest Aptian
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.
Mercury enrichment indicates volcanic triggering of Valanginian environmental change
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.

Collaboration

Group / person Country
Types of collaboration
Dr. Thierry Adatte Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
Prof. Slah Boulila France (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
Dr. Jorge Spangenberg Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
EGU 2019 Poster Effect of intense weathering and post-depositional degradation of organic matter on Hg sequestration in organic-rich sediments and its implications for deep-time investigations. 11.04.2019 Vienne, Austria Charbonnier Guillaume; Adatte Thierry;
EGU 2018 Poster Impact of the degradation of organic matter on the Hg/TOC ratio in the Bonarelli Level (Cenomanian-Turonian boundary interval): implications for deep-time investigations 25.04.2018 Vienna, Austria Charbonnier Guillaume; Adatte Thierry;
EGU 2017 Talk given at a conference Mercury enrichment indicates volcanic triggering of the Valanginian environmental change 25.04.2017 Vienna, Austria Adatte Thierry; Charbonnier Guillaume;


Associated projects

Number Title Start Funding scheme
144459 The evolution of the northern Tethyan carbonate platform during the Hauterivian and early Aptian (Early Cretaceous) 01.11.2012 Project funding (Div. I-III)
149546 A sedimentological and geochemical analysis of Lower Toarcian sediments across a Swiss transect: Evaluating the impact of the Toarcian Anoxic Event 01.11.2013 Project funding (Div. I-III)

Abstract

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.
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