NSF Org:	EAR Division Of Earth Sciences
Recipient:	UNIVERSITY OF WISCONSIN SYSTEM
Initial Amendment Date:	March 4, 2004
Latest Amendment Date:	April 6, 2005
Award Number:	0337498
Award Instrument:	Standard Grant
Program Manager:	David Fountain EAR  Division Of Earth Sciences GEO  Directorate for Geosciences
Start Date:	March 1, 2004
End Date:	February 28, 2006 (Estimated)
Total Intended Award Amount:	$77,768.00
Total Awarded Amount to Date:	$77,768.00
Funds Obligated to Date:	FY 2004 = $77,768.00
History of Investigator:	Basil Tikoff (Principal Investigator) basil@geology.wisc.edu
Recipient Sponsored Research Office:	University of Wisconsin-Madison 21 N PARK ST STE 6301 MADISON WI  US  53715-1218 (608)262-3822
Sponsor Congressional District:	02
Primary Place of Performance:	University of Wisconsin-Madison 21 N PARK ST STE 6301 MADISON WI  US  53715-1218
Primary Place of Performance Congressional District:	02
Unique Entity Identifier (UEI):	LCLSJAGTNZQ7
Parent UEI:
NSF Program(s):	Tectonics
Primary Program Source:	app-0104
Program Reference Code(s):	0000, OTHR
Program Element Code(s):	157200
Award Agency Code:	4900
Fund Agency Code:	4900
Assistance Listing Number(s):	47.050

ABSTRACT

The development of fabric and anisotropy in mantle peridotites in natural shear zones of the New Caledonia ophiolite is being studied using a combination of electron backscatter diffraction and high-field anisotropy of magnetic susceptibility techniques to determine lattice preferred orientation. Electron backscatter diffraction provides an accurate measurement of lattice preferred orientation and yields information on slip systems and deformation temperatures. High-field anisotropy of magnetic susceptibility is a new method that provides the orientation of the fabric main axes and the degree of anisotropy by isolating the magnetic contribution of silicates. The high-field anisotropy of magnetic susceptibility method is considerably faster than electron backscatter diffraction and, therefore, allows mapping of deformation gradients at a higher resolution. The project is quantitatively establishing the degree of correlation between high-field magnetic anisotropy and mineral fabric anisotropy determined using electron backscatter diffraction and other well-established methods such as the universal stage technique. If successful, the new method will permit more rapid study of mantle fabrics over a large area, thus aiding interpretation of seismic anisotropy data from the mantle.

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