NSF Org:	EAR Division Of Earth Sciences
Recipient:	REGENTS OF THE UNIVERSITY OF MICHIGAN
Initial Amendment Date:	August 10, 2005
Latest Amendment Date:	July 21, 2010
Award Number:	0447113
Award Instrument:	Continuing Grant
Program Manager:	David Lambert EAR  Division Of Earth Sciences GEO  Directorate for Geosciences
Start Date:	September 1, 2005
End Date:	August 31, 2011 (Estimated)
Total Intended Award Amount:	$281,284.00
Total Awarded Amount to Date:	$281,284.00
Funds Obligated to Date:	FY 2005 = $100,718.00 FY 2006 = $90,587.00 FY 2007 = $89,979.00
History of Investigator:	Rebecca Lange (Principal Investigator) becky@umich.edu
Recipient Sponsored Research Office:	Regents of the University of Michigan - Ann Arbor 1109 GEDDES AVE STE 3300 ANN ARBOR MI  US  48109-1015 (734)763-6438
Sponsor Congressional District:	06
Primary Place of Performance:	Regents of the University of Michigan - Ann Arbor 1109 GEDDES AVE STE 3300 ANN ARBOR MI  US  48109-1015
Primary Place of Performance Congressional District:	06
Unique Entity Identifier (UEI):	GNJ7BBP73WE9
Parent UEI:
NSF Program(s):	Instrumentation & Facilities
Primary Program Source:	app-0105  app-0106  app-0107
Program Reference Code(s):	0000, OTHR
Program Element Code(s):	158000
Award Agency Code:	4900
Fund Agency Code:	4900
Assistance Listing Number(s):	47.050

ABSTRACT

EAR-0447113
Lange

The goal of this project is the development of a high-pressure acoustic interferometer that can be used to measure the sound speed and density (and thus compressibility) of silicate liquids in an internally heated pressure vessel (IHPV). We plan to develop two different techniques at elevated pressure: (1) the frequency sweep method to measure liquid sound speed, and (2) the reflection coefficient method to measure liquid density. We will use an existing IHPV that is operable to 0.3 GPa and 1200 degrees celsius. Funds from this grant will be used for various equipment and machine shop costs and to partially support a full-time technician. Measurement of the density and compressibility of silicate liquids at high pressure is a major experimental imperative in the earth sciences, especially when applied to volatile-bearing melts. These data are needed for accurate thermodynamic calculations of crystal-melt and fluid-melt equilibrium at depth, which in turn are required for quantitative models of partial melting, melt transport, crystallization and degassing, and the mechanics of magma eruption. The graduate students involved in this project will obtain a strong background in thermodynamics, acoustics and signal processing, as well as petrology and geochemistry. It is anticipated that the techniques that we develop will become widely used throughout the ultrasonics and earth sciences community.

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