Skip Navigation Links

Project Information

COLLABORATIVE RESEARCH: INVESTIGATION OF PAIRED URANIUM AND CHROMIUM ISOTOPE BEHAVIOR DURING AUTHIGENIC METAL UPTAKE INTO CONTINENTAL MARGIN SEDIMENTS

Agency:
NSF

National Science Foundation

Project Number:
1657690
Contact PI / Project Leader:
SEVERMANN, SILKE
Awardee Organization:
RUTGERS THE ST UNIV OF NJ NEW BRUNSWICK

Description

Abstract Text:
Chemical measurements in ocean sediment cores can be used to reconstruct past variations in the composition of seawater, environmental conditions, and climate. In order to do so we must understand exactly how the chemical composition of sediments is set and how it relates to environmental conditions. The concentrations of trace metals such as uranium (U) and, to a lesser extent, chromium (Cr) in sediments have been used to reconstruct past variations in ocean biological production, bottom water oxygen concentrations, or both. Potentially even more valuable than absolute concentrations of these elements are variations in the ratios of their different isotopes. In order to fully understand and use this tool for interpreting the past, this study will involve a detailed investigation of uranium and chromium isotope chemistry in modern ocean sediments. One graduate student, one postdoctoral researcher, and several undergraduate students will be funded through this project. Outreach activities will be coordinated with the Rutgers Marine Sciences outreach program. Severmann and her lab members will lead the annual Climate Change Teen Summit and will introduce the students and teachers to themes related directly to the research. This program is aimed at stimulating the interest of about 200 NY-NJ high school students in science, technology, engineering and math (STEM). The program will introduce young people to scientific concepts through hands-on activities and talks, and support students in planning and implementing science-related service projects in their local communities. The primary goal of this project is to advance the calibration and development of U and Cr isotopes as paleo-redox proxies. Authigenic metal isotope proxies offer a distinct advantage over simple metal abundances as they can provide additional information regarding the mechanism 
of metal uptake, and they do not require correction for variable mass accumulation rates.
 Current measurements of U and Cr isotope compositions in marine sediments, combined with experimental results, provide a first-order understanding of the dominant isotope effects associated with 
different sedimentary sinks and their uptake mechanism. However, since authigenic uptake for 
both metals takes place predominantly within the sediment package, a detailed investigation
 of the isotope effects during early diagenetic transformation is essential for fully exploiting 
these isotope systems as paleoproxies. The investigators will measure U and Cr isotope compositions in a suite of sites that are representative 
of typical continental margins. For both metals, these types of sediments represent a dominant
 oceanic sink; results from this study will thus fill a major gap in efforts to constrain the global isotope mass balance. By pairing sediment with porewater measurements the investigators will quantify the specific isotope fractionations associated with metal sequestration into 
reducing sediments. They will pair isotope measurements with detailed investigation
 of the elements' fundamental biogeochemical behavior in these settings, which currently is lacking, especially for Cr. The cumulative isotope effect at depth will be compared
 to depositional boundary conditions such as organic carbon burial rates and bottom water oxygenation, which will facilitate parameterization of sedimentary sinks globally. The central thesis is that these two elements will exhibit predictable behavior that is directly tied to organic
matter cycling (U) and metal oxide cycling (Cr) and that their paired isotope systems will 
prove to be a powerful combination for tracing net oxygenation in the ocean.
Project Terms:
Behavior; Biological; Burial; Calibration; Carbon; Chemicals; Chemistry; Chromium; Climate; climate change; Communities; Deposition; Development; Elements; Equilibrium; Exhibits; Fractionation; Funding; Future Teacher; Goals; graduate student; High School Student; interest; Investigation; Isotopes; Lead; Marine Sediment; Marines; Measurement; Measures; member; metal oxide; Metals; Modernization; Names; Oceans; outreach; outreach program; Oxidation-Reduction; Oxygen; Production; programs; Proxy; Research; Research Personnel; Science; Science, Technology, Engineering and Mathematics; Seawater; Services; Site; Students; symposium; System; Teenagers; tool; Trace metal; undergraduate student; uptake; Uranium; Variant; Water

Details

Contact PI / Project Leader Information:
Name:  SEVERMANN, SILKE
Other PI Information:
Not Applicable
Awardee Organization:
Name:  RUTGERS THE ST UNIV OF NJ NEW BRUNSWICK
City:  PISCATAWAY    
Country:  UNITED STATES
Congressional District:
State Code:  NJ
District:  06
Other Information:
Fiscal Year: 2017
Award Notice Date: 12-Apr-2017
DUNS Number: 001912864
Project Start Date: 01-Apr-2017
Budget Start Date:
CFDA Code: 47.050
Project End Date: 31-Mar-2020
Budget End Date:
Agency: ?

Agency: The entity responsible for the administering of a research grant, project, or contract. This may represent a federal department, agency, or sub-agency (institute or center). Details on agencies in Federal RePORTER can be found in the FAQ page.

National Science Foundation
Project Funding Information for 2017:
Year Agency

Agency: The entity responsible for the administering of a research grant, project, or contract. This may represent a federal department, agency, or sub-agency (institute or center). Details on agencies in Federal RePORTER can be found in the FAQ page.

FY Total Cost
2017 NSF

National Science Foundation

$521,801

Results

i

It is important to recognize, and consider in any interpretation of Federal RePORTER data, that the publication and patent information cannot be associated with any particular year of a research project. The lag between research being conducted and the availability of its results in a publication or patent award varies substantially. For that reason, it's difficult, if not impossible, to associate a publication or patent with any specific year of the project. Likewise, it is not possible to associate a publication or patent with any particular supplement to a research project or a particular subproject of a multi-project grant.

ABOUT FEDERAL REPORTER RESULTS

Publications: i

Click on the column header to sort the results

PubMed = PubMed PubMed Central = PubMed Central Google Scholar = Google Scholar

Patents: i

Click on the column header to sort the results

Similar Projects

Download Adobe Acrobat Reader:Adobe Acrobat VERSION: 3.41.0 Release Notes
Back to Top