Evidence for Shelf Acidification During the Onset of The Paleocene-Eocene Thermal Maximium

被引:31
作者
Bralower, Timothy J. [1 ]
Kump, Lee R. [1 ]
Self-Trail, Jean M. [2 ]
Robinson, Marci M. [2 ]
Lyons, Shelby [1 ]
Babila, Tali [3 ]
Ballaron, Edward [4 ]
Freeman, Katherine H. [1 ]
Hajek, Elizabeth [1 ]
Rush, William [4 ]
Zachos, James C. [4 ]
机构
[1] Penn State Univ, Dept Geosci, University Pk, PA 16802 USA
[2] US Geol Survey, 959 Natl Ctr, Reston, VA 22092 USA
[3] Univ Southampton, Natl Oceanog Ctr Southampton, Ocean & Earth Sci, Southampton, Hants, England
[4] Univ Calif Santa Cruz, Earth & Planetary Sci, Santa Cruz, CA 95064 USA
关键词
OCEAN ACIDIFICATION; LATEST PALEOCENE; CALCAREOUS NANNOFOSSILS; PLANKTONIC-FORAMINIFERA; CARBONATE SATURATION; EQUATORIAL ATLANTIC; ISOTOPE EXCURSIONS; COMPENSATION DEPTH; STABLE-ISOTOPES; METHANE RELEASE;
D O I
10.1029/2018PA003382
中图分类号
P [天文学、地球科学];
学科分类号
070403 [天体物理学];
摘要
A transect of paleoshelf cores from Maryland and New Jersey contains an similar to 0.19- to 1.61-m-thick interval with reduced percentages of carbonate during the onset of the Paleocene-Eocene Thermal Maximum (PETM). Outer paleoshelf cores are barren of nannofossils and correspond to two minor disconformities. Middle paleoshelf cores contain a mixture of samples devoid of nannofossils and those with rare specimens characterized by significant dissolution (i.e., etching). The magnitude of the decrease in carbonate cannot be explained by dilution by clastic material or dissolution resulting from the oxidation of organic matter during early diagenesis. The observed preservation pattern implies a shoaling of the calcite compensation depth and lysocline to the middle shelf. This reduced carbonate interval is observed during the onset of the PETM on other continental margins raising the possibility that extreme shoaling of the calcite compensation depth and lysocline was a global signal, which is more significant than in previous estimates for the PETM. An alternative scenario is that shoaling was restricted to the northwest Atlantic, enhanced by regional and local factors (eutrophication from rivers and microbial activity associated with warming) that exacerbated the impact of acidification on the shelf.
引用
收藏
页码:1408 / 1426
页数:19
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