Carbon isotope records reveal synchronicity between carbon cycle perturbation and the "Carnian Pluvial Event" in the Tethys realm (Late Triassic)

Jacopo Dal Corso, Piero Gianolla, Robert J. Newton, Marco Franceschi, Guido Roghi, Marcello Caggiati, Béla Raucsik, Tamás Budai, J. Haas, Nereo Preto

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

In the early Late Triassic a period of increased rainfall, named the Carnian Pluvial Event (CPE), is evidenced by major lithological changes in continental and marine successions worldwide. The environmental change seems to be closely associated with a negative carbon isotope excursion that was identified in a stratigraphic succession of the Dolomites (Italy) but the temporal relationship between these phenomena is still not well defined. Here we present organic-carbon isotope data from Carnian deep-water stratigraphic sections in Austria and Hungary, and carbonate petrography of samples from a marginal marine section in Italy. A negative 2-4‰ δ13C shift is recorded by bulk organic matter in the studied sections and is coincident with a similar feature highlighted in higher plant and marine algal biomarker carbon-isotope records from the Dolomites (Italy), thus testifying to a global change in the isotopic composition of the reservoirs of the exchangeable carbon. Our new observations verify that sedimentological changes related to the CPE coincide with the carbon cycle perturbation and therefore occurred synchronously within the western Tethys. Consistent with modern observations, our results show that the injection of 13C-depleted CO2 into the Carnian atmosphere-ocean system may have been directly responsible for the increase in rainfall by intensifying the Pangaean mega-monsoon activity. The consequent increased continental weathering and erosion led to the transfer of large amounts of siliciclastics into the basins that were rapidly filled up, while the increased nutrient flux triggered the local development of anoxia. The new carbonate petrography data show that these changes also coincided with the demise of platform microbial carbonate factories and their replacement with metazoan driven carbonate deposition. This had the effect of considerably decreasing carbonate deposition in shallow water environments.

Original languageEnglish
Pages (from-to)79-90
Number of pages12
JournalGlobal and Planetary Change
Volume127
DOIs
Publication statusPublished - Apr 1 2015

Fingerprint

Carnian
Tethys
carbon cycle
carbon isotope
Triassic
perturbation
carbonate
petrography
dolomite
atmosphere-ocean system
rainfall
metazoan
anoxia
global change
biomarker
environmental change
monsoon
isotopic composition
shallow water
weathering

Keywords

  • Carbon isotope
  • Carbonate crisis
  • Carnian Pluvial Event
  • Late Triassic
  • Oxygen depletion

ASJC Scopus subject areas

  • Global and Planetary Change
  • Oceanography

Cite this

Carbon isotope records reveal synchronicity between carbon cycle perturbation and the "Carnian Pluvial Event" in the Tethys realm (Late Triassic). / Dal Corso, Jacopo; Gianolla, Piero; Newton, Robert J.; Franceschi, Marco; Roghi, Guido; Caggiati, Marcello; Raucsik, Béla; Budai, Tamás; Haas, J.; Preto, Nereo.

In: Global and Planetary Change, Vol. 127, 01.04.2015, p. 79-90.

Research output: Contribution to journalArticle

Dal Corso, Jacopo ; Gianolla, Piero ; Newton, Robert J. ; Franceschi, Marco ; Roghi, Guido ; Caggiati, Marcello ; Raucsik, Béla ; Budai, Tamás ; Haas, J. ; Preto, Nereo. / Carbon isotope records reveal synchronicity between carbon cycle perturbation and the "Carnian Pluvial Event" in the Tethys realm (Late Triassic). In: Global and Planetary Change. 2015 ; Vol. 127. pp. 79-90.
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AU - Dal Corso, Jacopo

AU - Gianolla, Piero

AU - Newton, Robert J.

AU - Franceschi, Marco

AU - Roghi, Guido

AU - Caggiati, Marcello

AU - Raucsik, Béla

AU - Budai, Tamás

AU - Haas, J.

AU - Preto, Nereo

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