NSF Org:	OCE Division Of Ocean Sciences
Recipient:	CARNEGIE INSTITUTION OF WASHINGTON
Initial Amendment Date:	October 21, 1999
Latest Amendment Date:	April 23, 2002
Award Number:	9907174
Award Instrument:	Continuing Grant
Program Manager:	Bilal U. Haq OCE  Division Of Ocean Sciences GEO  Directorate for Geosciences
Start Date:	November 1, 1999
End Date:	October 31, 2003 (Estimated)
Total Intended Award Amount:	$198,235.00
Total Awarded Amount to Date:	$198,235.00
Funds Obligated to Date:	FY 2000 = $55,609.00 FY 2001 = $70,484.00 FY 2002 = $72,142.00
History of Investigator:	Steven Shirey (Principal Investigator) sshirey@carnegiescience.edu Erik Hauri (Co-Principal Investigator) Petrus Le Roux (Co-Principal Investigator) Philip Janney (Former Co-Principal Investigator)
Recipient Sponsored Research Office:	Carnegie Institution of Washington 5241 BROAD BRANCH RD NW WASHINGTON DC  US  20015-1305 (202)387-6400
Sponsor Congressional District:	00
Primary Place of Performance:	Carnegie Institution of Washington 5241 BROAD BRANCH RD NW WASHINGTON DC  US  20015-1305
Primary Place of Performance Congressional District:	00
Unique Entity Identifier (UEI):	ZQ12LY4L5H39
Parent UEI:
NSF Program(s):	Marine Geology and Geophysics
Primary Program Source:	app-0100  01000102DB NSF RESEARCH & RELATED ACTIVIT app-0102
Program Reference Code(s):	0000, OTHR
Program Element Code(s):	162000
Award Agency Code:	4900
Fund Agency Code:	4900
Assistance Listing Number(s):	47.050

ABSTRACT

An ion microprobe (secondary ion mass spectrometer) study of the halogens (Cl, F), volatiles (CO2, H2O, S), light elements (B, Li) and their relevant isotopic compositions (7Li/6Li, 11B/10B, 34S/32S and 37Cl/35Cl) will be carried out on well-characterized East Pacific Rise (EPR) glasses from the 9 degrees N, 12 degrees N, and 15-16degrees N regions. Assimilation of seawater components into basaltic magma along the global ocean ridge system may be more widespread than is commonly assumed. At fast-spreading ridges such as the EPR where axial magma chambers are well-defined, this process may be ubiquitous. There is currently a poor understanding of the seawater-component assimilation process on the local spatial scale of volcanic features and petrologic segmentation. This work will use different geochemical tools, each with its own response to the assimilation process and look at segments of the ridge system where small differences in spreading rate, volcanic edifice, lithospheric structure and axial magma chamber morphology can be recognized. The purpose of this study is to determine how and where seawater component assimilation occurs in the oceanic lithosphere, to relate differences in the extent of this process to volcanic and morphologic features of the oceanic ridge system.

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