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| Main Authors: | , , , , , , , , , , |
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| Format: | Dataset Open Access |
| Language: | en |
| Published: |
PANGAEA
2018
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| Subjects: | |
| Online Access: | https://doi.org/10.1594/PANGAEA.896839 |
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| _version_ | 1867169515937202176 |
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| author | Bralower, Timothy J Kump, Lee R Self-Trail, Jean Robinson, Marci M Lyons, Shelby Babila, Tali L Ballaron, Edward Freeman, Katherine H Hajek, Elizabeth Rush, William Zachos, James C |
| author_facet | Bralower, Timothy J Kump, Lee R Self-Trail, Jean Robinson, Marci M Lyons, Shelby Babila, Tali L Ballaron, Edward Freeman, Katherine H Hajek, Elizabeth Rush, William Zachos, James C |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | A transect of paleoshelf cores from Maryland and New Jersey contains an ~0.19 m 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 (CCD) 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 CCD 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, microbial activity associated with warming) that exacerbated the impact of acidification on the shelf. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_896839 |
| institution | PANGAEA |
| language | en |
| publishDate | 2018 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Carbonate, stable isotope data, abundance of pyrite and siderite, pyrite alteration and nannofossil Whole Shield Index during the PETM Bralower, Timothy J Kump, Lee R Self-Trail, Jean Robinson, Marci M Lyons, Shelby Babila, Tali L Ballaron, Edward Freeman, Katherine H Hajek, Elizabeth Rush, William Zachos, James C A transect of paleoshelf cores from Maryland and New Jersey contains an ~0.19 m 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 (CCD) 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 CCD 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, microbial activity associated with warming) that exacerbated the impact of acidification on the shelf. |
| title | Carbonate, stable isotope data, abundance of pyrite and siderite, pyrite alteration and nannofossil Whole Shield Index during the PETM |
| topic | |
| url | https://doi.org/10.1594/PANGAEA.896839 |