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Application of multiproxy tracers to reconstruct paleoenvironmental perturbations on the mid-Atlantic margin across the Paleocene-Eocene thermal maximum
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Makarova, Maria. Application of multiproxy tracers to reconstruct paleoenvironmental perturbations on the mid-Atlantic margin across the Paleocene-Eocene thermal maximum. Retrieved from https://doi.org/doi:10.7282/t3-k5md-yd57

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TitleApplication of multiproxy tracers to reconstruct paleoenvironmental perturbations on the mid-Atlantic margin across the Paleocene-Eocene thermal maximum
NameMakarova, Maria (author); Miller, Kenneth G. (chair); Wright, James D. (internal member); Rosenthal, Yair (internal member); Herbert, Timothy D. (outside member); Rutgers University; School of Graduate Studies
Date Created2018
Other Date2018-10 (degree)
SubjectGeological Sciences, Paleocene-Eocene thermal maximum
Extent1 online resource (205 pages) : illustrations
DescriptionThe 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.
NotePh.D.
NoteIncludes bibliographical references
Noteby Maria Makarova
Genretheses, ETD doctoral
Persistent URLhttps://doi.org/doi:10.7282/t3-k5md-yd57
Languageeng
CollectionSchool of Graduate Studies Electronic Theses and Dissertations
Organization NameRutgers, The State University of New Jersey
RightsThe author owns the copyright to this work.
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