Carbon sequestration in an expanded lake system during the Toarcian oceanic anoxic event
| Autor: | B. David A. Naafs, Weimu Xu, Stephen P. Hesselbo, Erik Tegelaar, Micha Ruhl, Richard D. Pancost, Johan W.H. Weijers, James B. Riding, Hugh C. Jenkyns, David Selby, Erdem Idiz |
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| Rok vydání: | 2017 |
| Předmět: |
Palynology
Total organic carbon 010504 meteorology & atmospheric sciences Environmental change Fluvial Carbon cycle Carbon sequestration Palaeoclimate 010502 geochemistry & geophysics 01 natural sciences Anoxic waters Oceanography Productivity (ecology) Limnology Environmental Impact General Earth and Planetary Sciences Geology 0105 earth and related environmental sciences |
| Zdroj: | Nature geoscience, 2017, Vol.16(2), pp.129-134 [Peer Reviewed Journal] Xu, W, Ruhl, M, Jenkyns, H C, Hesselbo, S, Riding, J, Selby, D, Naafs, D, Weijers, J, Pancost, R, Tegelaar, E & Idiz, E 2017, ' Carbon sequestration in an expanded lake system during the Toarcian oceanic anoxic event ', Nature Geoscience, vol. 10, no. 2, pp. 129-134 . https://doi.org/10.1038/ngeo2871 |
| Popis: | The Early Jurassic Toarcian oceanic anoxic event (∼183 Ma) was marked by marineanoxia–euxinia and globally significant organic-matter burial, accompanied by amajor global carbon-cycle perturbation probably linked to Karoo–Ferrarvolcanism. Although the Toarcian oceanic anoxic event is well studied in themarine realm, accompanying climatic and environmental change on the continentsis poorly understood. Here, utilizing radioisotopic, palynological and geochemicaldata from lacustrine black shales, we demonstrate that a large lake systemdeveloped contemporaneously with the Toarcian oceanic anoxic event in theSichuan Basin, China, probably due to enhanced hydrological cycling underelevated atmospheric pCO2 . We attribute increased lacustrine organicproductivity to elevated fluvial nutrient supply, which resulted in the burialof ∼460 Gt of organic carbon in the Sichuan Basin alone, creating an importantnegative feedback in the global exogenic carbon cycle. We suggest that enhancednutrient delivery to marine and large lacustrine systems was a key component inthe global carbon cycle recovery during the Toarcian oceanic anoxic event andacted to shorten the duration of the recovery of global δ 13C values. |
| Databáze: | OpenAIRE |
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