Mid-cretaceous carbon cycle perturbations and Oceanic Anoxic Events recorded in southern Tibet
Zhang, X.; Chen, K.; Hu, D.; Sha, J. (2016). Mid-cretaceous carbon cycle perturbations and Oceanic Anoxic Events recorded in southern Tibet. NPG Scientific Reports 6(39643): 6 pp. http://dx.doi.org/10.1038/srep39643
In: Scientific Reports (Nature Publishing Group). Nature Publishing Group: London. ISSN 2045-2322; e-ISSN 2045-2322, more
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| Authors | | Top |
- Zhang, X.
- Chen, K.
- Hu, D.
- Sha, J.
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| Abstract |
The organic carbon isotope (delta C-13(org)) curve for similar to 1.7-km-thick mid-Cretaceous strata of the Chaqiela section in Gamba area, southern Tibet is presented in this study. C-isotopic chemostratigraphic correlation combined with biostratigraphic constraints show that the Chaqiela section spans early Aptian through early Campanian period, and that almost all of the carbon cycle perturbations and Oceanic Anoxic Events during the mid-Cretaceous period are well recorded in the continental margin area of the southeastern Tethys Ocean. Significantly, two levels of methane-derived authigenic carbonates were identified at the onset of OAE1b near the Aptian-Albian boundary. We suggest that an increase in methane release from gas hydrates, potentially driven by sea-level fall and bottom water temperature increase, may have contributed to the large negative d13Corg excursions and global warming during OAE1b. |
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