期刊
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
卷 385, 期 -, 页码 95-105出版社
ELSEVIER
DOI: 10.1016/j.palaeo.2013.01.005
关键词
Cretaceous; Tertiary; Atmospheric CO2; Paleosol; Pedogenic carbonate; Deccan Traps; Chicxulub impact; China
资金
- National Basic Research Program of China (973 Program) [2012CB822003]
- Program for New Century Excellent Talents in University [NCET-08-0379]
A dramatic change in atmospheric composition has been postulated because of global carbon cycle disruption during the Cretaceous (K)-Tertiary (T) transition following the Chicxulub impact and Deccan Trap eruptions. Here, pedogenic carbonates were collected from drill core of a borehole (SK-1 (N)) straddling the Late Cretaceous and early Paleocene strata in the Songliao Basin, northeast China, to reconstruct atmospheric CO2 concentrations using a paleosol paleobarometer. Our estimates for atmospheric pCO(2) from paleosol carbonates range between 277 +/- 115 ppmv and 837 +/- 164 ppmv between 67.8 Ma and 63.1 Ma. One large (similar to 66-65.5 Ma) and several small CO2 spikes (similar to 64.7-similar to 64.2 Ma) during the latest Maastrichtian to earliest Danian are reported here and incorporated with previously published pCO(2) estimates also estimated from paleosol carbonates. These CO2 spikes are attributed to one-million-year-long emplacement of the large Deccan flood basalts along with the extraterrestrial impact at the K-T boundary. (C) 2013 Elsevier B.V. All rights reserved.
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