EGU General Assembly 2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Tethys carbon cycle, India-Eurasia collision, and Cenozoic climate evolution

Lucas Vimpere1, Sébastien Castelltort1, Pietro Sternai2, and Pierre Bouilhol3
Lucas Vimpere et al.
  • 1Department of Earth Sciences, University of Geneva, Geneva, Switzerland (
  • 2Dipartimento di Scienze dell’Ambiente e della Terra, Università degli Studi di Milano-Bicocca, Milano, Italy (
  • 3Centre de Recherches Pétrographiques et Géochimiques, Université de Lorraine, Vandoeuvre-les-Nancy, France (


Since the industrial revolution, the constant increase in atmospheric CO2 had pivotal impacts on global climate with current concentrations being the highest of the last 800 ka. In order to better understand the Earth system and the future evolution of climates, it is essential to study past hyperthermals during which global surface temperature dramatically increased above present levels. The Himalaya arose from the biggest known continental collision and has been associated with a bustling volcanism, which most likely steered the global warming (+12-14 °C) during the Early Eocene Climatic Optimum (EECO).

We here present the analytic strategy that will be implemented to quantify the carbon cycle within the Kohistan-Ladakh forearc sediments. Whilst the CO2 input (warming) in the atmosphere related to the intensity of subduction magmatism will be quantified using the mercury isotopes, the CO2 sink (cooling) induced by continental alteration of the exhumed units will be studied through different isotopic analyses (e.g., Hf, Nd, Sr). The stratigraphy and the reconstruction of depositional environments will be assessed through conventional field surveys and various dating methods such as, detrital zircon, nannofossils, radiolarians, and calibrated carbon isotopic curves. The overall objective is to establish the influence of the collisional Himalayan chain on global climate changes.

How to cite: Vimpere, L., Castelltort, S., Sternai, P., and Bouilhol, P.: Tethys carbon cycle, India-Eurasia collision, and Cenozoic climate evolution, EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-3311,, 2023.