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Application of multiproxy tracers to reconstruct paleoenvironmental perturbations on the mid-Atlantic margin across the Paleocene-Eocene thermal maximum
Descriptive
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Title
Application of multiproxy tracers to reconstruct paleoenvironmental perturbations on the mid-Atlantic margin across the Paleocene-Eocene thermal maximum
Name
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Makarova
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Maria
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1988-
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Maria Makarova
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author
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Miller
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Kenneth G.
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Kenneth G. Miller
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Advisory Committee
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chair
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Wright
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James D.
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James D. Wright
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Advisory Committee
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internal member
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Rosenthal
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Yair
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Yair Rosenthal
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Advisory Committee
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internal member
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Herbert
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(type = given)
Timothy D.
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Timothy D. Herbert
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Advisory Committee
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Rutgers University
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School of Graduate Studies
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Text
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theses
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2018
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2018-10
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2018
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xx
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eng
Abstract
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The Paleocene-Eocene Thermal Maximum (PETM) was an abrupt warming event (~56 Ma) characterized by a global temperature increase estimated to be on the order of 4-9°C and associated with a carbon isotope excursion of 2-7‰ requiring a substantial addition of light carbon (12C) into global reservoirs. This dissertation presents an integrated view of the spatial and temporal environmental perturbations caused by the PETM on the mid-Atlantic continental shelf by the use of multiple paleoproxies. The approach used here to resolve regional from global ecological and hydrographic responses is to construct a cross-shelf transect with sites that range in coastal proximity and environmental influence. I show new records from Millville and Medford cores and sample the PETM in a shelf transect of five drillsites from the New Jersey Coastal Plain (NJCP): Medford, Wilson Lake, Ancora, Millville, and Bass River.
Application of the multiproxy approach reveals a warming of 6-7°C on the New Jersey paleoshelf during the PETM. Surface dwelling foraminifera recorded smaller δ18O anomalies, caused by changes in shelf hydrography and/or calcification preclusion of foraminifera at temperatures above the survival limit of ~33°C. The organic paleothermometer TEX86-based temperature estimates show comparable warming anomalies among the NJCP sections with a slightly larger warming recorded in the nearshore sites. The study of the Medford cores, the most expanded section of the PETM onset from the NJCP, indicated no warming prior to the CIE onset, rejecting the precursor warming hypothesis. Bulk sediment records together with trace elemental ratios in foraminifera suggested rapid mud deposition on the shelf accompanied by a decrease in the water column oxygen content.
The significance of this work is a detailed chemostratigraphic correlation that integrates planktonic and benthic foraminiferal stable isotopic data, temperature records from independent proxies (TEX86 and foraminiferal Mg/Ca ratio), and an evaluation of salinity variations on the shelf. Lastly, this study utilizes the novel paleoredox proxy (foraminiferal I/Ca ratio) to evaluate water column deoxygenation on the New Jersey paleoshelf during the PETM.
Application of the multiproxy approach reveals a warming of 6-7°C on the New Jersey paleoshelf during the PETM. Surface dwelling foraminifera recorded smaller δ18O anomalies, caused by changes in shelf hydrography and/or calcification preclusion of foraminifera at temperatures above the survival limit of ~33°C. The organic paleothermometer TEX86-based temperature estimates show comparable warming anomalies among the NJCP sections with a slightly larger warming recorded in the nearshore sites. The study of the Medford cores, the most expanded section of the PETM onset from the NJCP, indicated no warming prior to the CIE onset, rejecting the precursor warming hypothesis. Bulk sediment records together with trace elemental ratios in foraminifera suggested rapid mud deposition on the shelf accompanied by a decrease in the water column oxygen content.
The significance of this work is a detailed chemostratigraphic correlation that integrates planktonic and benthic foraminiferal stable isotopic data, temperature records from independent proxies (TEX86 and foraminiferal Mg/Ca ratio), and an evaluation of salinity variations on the shelf. Lastly, this study utilizes the novel paleoredox proxy (foraminiferal I/Ca ratio) to evaluate water column deoxygenation on the New Jersey paleoshelf during the PETM.
Subject
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Topic
Geological Sciences
Subject
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Topic
Paleocene-Eocene thermal maximum
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Rutgers University Electronic Theses and Dissertations
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electronic resource
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Supplementary File: Appendix 1
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1 online resource (205 pages) : illustrations
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Ph.D.
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Includes bibliographical references
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by Maria Makarova
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School of Graduate Studies Electronic Theses and Dissertations
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rucore10001600001
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doi:10.7282/t3-k5md-yd57
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ETD doctoral
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The author owns the copyright to this work.
RightsHolder
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Name
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Makarova
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Maria
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Permission or license
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2018-10-02 17:04:12
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Maria Makarova
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Rutgers University. School of Graduate Studies
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Author Agreement License
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I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
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2018-10-31
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2019-10-31
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Access to this PDF has been restricted at the author's request. It will be publicly available after October 31st, 2019.
Copyright
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Copyright protected
Availability
Status
Open
Reason
Permission or license
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