NSF Award Search: Award # 0806309

Award Abstract # 0806309

Magnetic properties of Arctic sediments: implications for magnetic stratigraphy

NSF Org:	OPP Office of Polar Programs (OPP)
Recipient:	UNIVERSITY OF FLORIDA
Initial Amendment Date:	August 6, 2008
Latest Amendment Date:	August 6, 2008
Award Number:	0806309
Award Instrument:	Standard Grant
Program Manager:	Henrietta Edmonds hedmonds@nsf.gov (703)292-7427 OPP Office of Polar Programs (OPP) GEO Directorate for Geosciences
Start Date:	September 1, 2008
End Date:	August 31, 2012 (Estimated)
Total Intended Award Amount:	$103,887.00
Total Awarded Amount to Date:	$103,887.00
Funds Obligated to Date:	FY 2008 = $103,887.00
History of Investigator:	James Channell (Principal Investigator) jetc@ufl.edu
Recipient Sponsored Research Office:	University of Florida 1523 UNION RD RM 207 GAINESVILLE FL US 32611-1941 (352)392-3516
Sponsor Congressional District:	03
Primary Place of Performance:	University of Florida 1523 UNION RD RM 207 GAINESVILLE FL US 32611-1941
Primary Place of Performance Congressional District:	03
Unique Entity Identifier (UEI):	NNFQH1JAPEP3
Parent UEI:
NSF Program(s):	ANS-Arctic Natural Sciences
Primary Program Source:	0100CYXXDB NSF RESEARCH & RELATED ACTIVIT
Program Reference Code(s):	0000, 1079, OTHR
Program Element Code(s):	528000
Award Agency Code:	4900
Fund Agency Code:	4900
Assistance Listing Number(s):	47.078

ABSTRACT

This project hypothesizes that zones of apparently reversed magnetization in Brunhes age sediments in the Arctic Ocean and Greenland-Norwegian Sea are due to self-reversal in the mineral greigite formed as alteration coatings from magnetite. Nine HOTRAX (Healy-Oden Trans-Arctic Expedition, 2005) cores will be studied in order to establish the stratigraphic control on natural remanent magnetization (NRM) component directions from core to core. Thermal demagnetization of NRM determined on Al foil-wrapped discrete sub-samples will help determine the carriers of NRM. Low temperature remanence loss and high temperature hysteresis data will establish the magnetic carriers. SEM (Scanning Electron Microscope) studies and X-ray diffraction of magnetic separates will augment the magnetic measurements. Successful completion of this project will identify a cause of reverse magnetization in Arctic marine sediments, leading to improved age dating of the sediments and correlations and control with global sediments based on magnetostratigraphy. The project will support one graduate student, and also involve undergraduate students in the core analysis.

PUBLICATIONS PRODUCED AS A RESULT OF THIS RESEARCH

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C. Xuan and J.E.T. Channell "Origin of apparent magnetic excursions in deep-sea sediments from Mendeleev-Alpha Ridge (Arctic Ocean)" Geochemistry, Geophysics and Geosystems , v.11 (2) , 2010 , p.1 10.1029/2009GC002879

C. Xuan, J.E.T. Channell, L. Polyak, D.A. Darby "Paleomagnetism of Quaternary sediments from Lomonosov Ridge and Yermak Plateau: Implications for age models in the Arctic Ocean" Quaternary Science Reviews , v.32 , 2012 , p.48 10.1016/j.quascirev.2011.11.015

J.E.T. Channell and c. Xuan "Self-reversal and apparent magnetic excursions in Arctic sediments" Earth and Planetary Science Letters , v.284 , 2009 , p.124

J.E.T. Channell and C. Xuan "Self-reversal and apparent magnetic excursions in Arctic sediments" Earth and Planetary Science Letters , v.284 , 2009 , p.124

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