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ISOTOPE RATIO AND TRACE ELEMENTAL IMAGING OF MINERALS BY SECONDARY ION MASS…

Award Information

Agency:
National Science Foundation
Branch:
N/A
Award ID:
17297
Program Year/Program:
1992 / SBIR
Agency Tracking Number:
17297
Solicitation Year:
N/A
Solicitation Topic Code:
N/A
Solicitation Number:
N/A
Small Business Information
Charles Evans & Associates
301 Chesapeake Drive Redwood City, CA 94063
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Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
 
Phase 1
Fiscal Year: 1992
Title: ISOTOPE RATIO AND TRACE ELEMENTAL IMAGING OF MINERALS BY SECONDARY ION MASS SPECTROMETRY
Agency: NSF
Contract: N/A
Award Amount: $49,987.00
 

Abstract:

WE PROPOSE TO DEVELOP SECONDARY ION MASS SPECTROMETRY (SIMS)BASED IMAGING ISOTOPE RATIO TECHNIQUES FOR ISOTOPIC MICROANALYSIS OF MINERAL DEPOSITS. WE WILL COMBINE THIS CAPABILITY WITH SIMS BASED TRACE ELEMENT MICROANALYSIS. THEPETROGENESIS OF ORE DEPOSITS OFTEN INVOLVES AN AQUEOUS SOLUTION BY WHICH THE ORE-BEARING COMPONENTS ARE TRANSPORTED. THESE HYDROTHERMAL SOLUTIONS ALSO TRANSPORT SULFUR. DIFFERENT AQUEOUS PROCESSES GIVE RISE TO DIFFERENT (34)S/(32)S ISOTOPE FRACTIONATIONS. THE (34)S/(32)S RATIOS CAN PROVIDE IMPORTANT INDICATIONS OF THE SULFUR ORIGIN, AND BY EXTENSION, THE ORIGIN OF ECONOMICALLY IMPORTANT METALS. ISOTOPE RATIO AND TRACE ELEMENT IMAGING SHOW THE INTERRELATIONSHIPS OF DIFFERENT MINERAL GENERATIONS. THESE GENERATIONS OFTEN COEXIST WITHIN A SINGLE MINERAL GRAIN. WEHAVE DEMONSTRATED THAT IMAGING SIMS CAN SUCCESSFULLY IDENTIFY THE LOCATION OF TRACE GOLD LEVELS ("INVISIBLE" GOLD) IN PYRITE RIMS, AND THAT ISOTOPE RATIO IMAGING OF METEORITIC MATERIALS HIGHLY ENRICHED IN DEUTERIUM IS POSSIBLE. HOWEVER, EXTENSION TO (34)S/(32)S ISOTOPE RATIO IMAGING REQUIRES FURTHER INNOVATION AND MANY CAREFUL MEASUREMENTS. IN PHASE II, WE WILL EXTEND THESE IMAGING TECHNIQUES TO MICROANALYTICAL AGE DATING AND MICROANALYTICAL TRACE ELEMENT PETROGENESIS.

Principal Investigator:

Ronald H. Fleming, Ph.d.
4153694567

Business Contact:

Small Business Information at Submission:

Charles Evans & Associates
301 Chesapeake Dr Redwood City, CA 94063

EIN/Tax ID:
DUNS: N/A
Number of Employees:
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No