Perturbation of the carbon cycle during the late Pliensbachian - early Toarcian: New insight from high-resolution carbon isotope records in Morocco - Archive ouverte HAL Access content directly
Journal Articles Journal of African Earth Sciences Year : 2016

Perturbation of the carbon cycle during the late Pliensbachian - early Toarcian: New insight from high-resolution carbon isotope records in Morocco

, , , , (1) , ,
1
Stephane Bodin
  • Function : Author
Francois-Nicolas Krencker
  • Function : Author
Tim Kothe
  • Function : Author
Rene Hoffmann
  • Function : Author
Ulrich Heimhofer
  • Function : Author
Lahcen Kabiri
  • Function : Author

Abstract

Preceding the early Toarcian Oceanic Anoxic Event by similar to 1 Myr, the Pliensbachian-Toarcian boundary event is in many aspects as severe and disturbing for the environment as its better-studied successor. Both events are associated with rapid and pronounced global warming, major faunal and floral turnover, increased hydrological cycling and dramatic collapses of carbonate production. To better characterize the Pliensbachian-Toarcian boundary event, a high-resolution, paired carbonate and organic matter carbon isotope survey of three sections from the Central High Atlas Basin of Morocco has been undertaken. A pronounced negative shift in the carbonate carbon-isotope record, not paralleled by a similar excursion in the organic carbon, can be linked to the collapse of the neritic carbonate factory in the earliest Toarcian. These results show that, contrary to the Toarcian Oceanic Anoxic Event, a rapid and massive injection of C-13-depleted carbon into the atmosphere is not responsible for the environmental perturbations observed during the Pliensbachian-Toarcian boundary event. However, input of isotopically non depleted carbon such as mantle source CO2 into the atmosphere as a potential cause for the Pliensbachian-Toarcian boundary event cannot be excluded. This would most probably be sourced from an early pulse of the Karoo-Ferrar Large Igneous Province. (C) 2015 Elsevier Ltd. All rights reserved.
Not file

Dates and versions

hal-02331117 , version 1 (24-10-2019)

Identifiers

Cite

Stephane Bodin, Francois-Nicolas Krencker, Tim Kothe, Rene Hoffmann, Emanuela Mattioli, et al.. Perturbation of the carbon cycle during the late Pliensbachian - early Toarcian: New insight from high-resolution carbon isotope records in Morocco. Journal of African Earth Sciences, 2016, 116, pp.89-104. ⟨10.1016/j.jafrearsci.2015.12.018⟩. ⟨hal-02331117⟩
62 View
0 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More