NSF Org:	EAR Division Of Earth Sciences
Recipient:	WASHINGTON UNIVERSITY, THE
Initial Amendment Date:	December 26, 1996
Latest Amendment Date:	October 26, 1998
Award Number:	9614264
Award Instrument:	Continuing Grant
Program Manager:	David Lambert EAR  Division Of Earth Sciences GEO  Directorate for Geosciences
Start Date:	January 1, 1997
End Date:	December 31, 1999 (Estimated)
Total Intended Award Amount:	$190,000.00
Total Awarded Amount to Date:	$190,000.00
Funds Obligated to Date:	FY 1997 = $125,000.00 FY 1999 = $65,000.00
History of Investigator:	Joyce Brannon (Principal Investigator) joyce@isochem.wustl.edu Frank Podosek (Co-Principal Investigator)
Recipient Sponsored Research Office:	Washington University 1 BROOKINGS DR SAINT LOUIS MO  US  63130-4862 (314)747-4134
Sponsor Congressional District:	01
Primary Place of Performance:	Washington University 1 BROOKINGS DR SAINT LOUIS MO  US  63130-4862
Primary Place of Performance Congressional District:	01
Unique Entity Identifier (UEI):	L6NFUM28LQM5
Parent UEI:
NSF Program(s):	Petrology and Geochemistry
Primary Program Source:	app-0197  app-0199
Program Reference Code(s):	0000, OTHR
Program Element Code(s):	157300
Award Agency Code:	4900
Fund Agency Code:	4900
Assistance Listing Number(s):	47.050

ABSTRACT

9614264 Brannon The proposed work seeks to improve on the isotopic methodology for dating ore-stage mineralization in Mississipi Valley-type (MVT) Pb-Zn deposits in order to provide necessary constraints for understanding the mechanisms of ore formation. The proposed study will concentrate on: (1) the radiometric dating of two North American MVT ore deposits (Illinois-Kentucky-Fluorspar and Pine-Point Zn-Pb deposits) for which conflicting ages of ore formation exist at the moment; (2) dating of ore-stage calcite and sphalerite from mines of the Tri-State (Missouri, Kansas, Oklahoma) MVT district; and (3) dating two Proterozoic MVT deposits in South Africa, thought to be among the oldest deposits of this type currently known. In addition to dating, the Rb-Sr and U-Th-Pb isotopic systematics will be used as tracers of the ore-forming fluids. Information on the source of fluids is necessary to assess models of ore genesis in the various localities and to construct a better genetic model for MVT's worldwide.

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