Impact of dissolution on the sedimentary record of the Paleocene-Eocene thermal maximum

被引:28
作者
Bralower, Timothy J. [1 ,2 ]
Kelly, D. Clay [3 ]
Gibbs, Samantha [4 ]
Farley, Kenneth [5 ]
Eccles, Laurie [1 ]
Lindemann, T. Logan [1 ]
Smith, Gregory J. [1 ]
机构
[1] Penn State Univ, Dept Geosci, University Pk, PA 16802 USA
[2] Univ New S Wales, Climate Change Res Ctr, Sydney, NSW 2052, Australia
[3] Univ Wisconsin, Dept Geosci, Madison, WI 53706 USA
[4] Univ Southampton, Natl Oceanog Ctr, Southampton SO14 3ZH, Hants, England
[5] CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA
基金
美国国家科学基金会;
关键词
dissolution; chemical erosion; nannofossils; planktonic foraminifera; Paleocene Eocene thermal maximum; CARBON-ISOTOPE EXCURSION; DEEP-SEA; OCEAN ACIDIFICATION; PLANKTONIC-FORAMINIFERA; METHANE HYDRATE; WALVIS RIDGE; GRAIN-SIZE; BOUNDARY; PACIFIC; FUEL;
D O I
10.1016/j.epsl.2014.05.055
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The input of massive amounts of carbon to the atmosphere and ocean at the Paleocene-Eocene Thermal Maximum (PETM; similar to 55.53 Ma) resulted in pervasive carbonate dissolution at the seafloor. At many sites this dissolution also penetrated into the underlying sediment column. The magnitude of dissolution at and below the seafloor, a process known as chemical erosion, and its effect on the stratigraphy of the PETM, are notoriously difficult to constrain. Here, we illuminate the impact of dissolution by analyzing the complete spectrum of sedimentological grain sizes across the PETM at three deep-sea sites characterized by a range of bottom water dissolution intensity. We show that the grain size spectrum provides a measure of the sediment fraction lost during dissolution. We compare these data with dissolution and other proxy records, electron micrograph observations of samples and lithology. The complete data set indicates that the two sites with slower carbonate accumulation, and less active bioturbation, are characterized by significant chemical erosion. At the third site, higher carbonate accumulation rates, more active bioturbation, and possibly winnowing have limited the impacts of dissolution. However, grain size data suggest that bioturbation and winnowing were not sufficiently intense to diminish the fidelity of isotopic and microfossil assemblage records. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:70 / 82
页数:13
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