CHLORINE ISOTOPE DISTRIBUTION IN CHONDRITIC METEORITES: SEARCH FOR MULTIPLE NEBULAR RESERVOIRSWE COMBINE THE DIVERSE EXPERTISE OF THREE P.I.S (MINERALOGY AND PETROLOGY PLANETARY MATERIALS ELEMENTAL GEOCHEMISTRY AND STABLE ISOTOPE GEOCHEMISTRY) TO USE A NOVEL GEOCHEMICAL TECHNIQUE TO ADDRESS ONE OF THE PRIMARY NASA ORIGINS OBJECTIVES "STRATEGIC SUB-GOAL 3 RELATING TO THE FORMATION OF OUR SOLAR SYSTEM". WE PROPOSE TO ANALYZE THE CHLORINE ISOTOPE COMPOSITION OF A DIVERSE SUITE OF CARBONACEOUS ORDINARY AND ENSTATITE CHONDRITES IN ORDER TO ESTABLISH THE DEGREE OF CL ISOTOPE HETEROGENEITY OF THE EARLY SOLAR NEBULA. CHLORINE IS AN UNUSUAL ELEMENT IN THAT EQUILIBRIUM ISOTOPE FRACTIONATIONS ARE RELATIVELY SMALL AND THE NUMBER OF NEBULAR PHASES THAT CONTAIN CHLORINE IS VERY LIMITED. THEREFORE FRACTIONATION (OR A LACK THEREOF) OF CL ISOTOPES BETWEEN METEORITE TYPES AND/OR INDIVIDUAL PHASES CAN PLACE PROFOUND CONSTRAINTS ON EARLY NEBULAR CONDITIONS. FOR EXAMPLE HCL AND NACL ARE CONSIDERED AS MAJOR CL-BEARING HIGH-T PHASES IN THE EARLY NEBULA. THE CL ISOTOPE FRACTIONATION BETWEEN THEM IS LARGE ENOUGH SO THAT RAYLEIGH FRACTIONATION PROCESSES COULD CONTRIBUTE TO LARGE DIFFERENCES IN THE CL ISOTOPE COMPOSITION OF DIFFERENT PHASES. IF HOWEVER ONLY ONE OF THESE TWO GASES WAS PREVALENT THEN NO ISOTOPIC FRACTIONATION COULD HAVE OCCURRED. WE WILL ANALYZE WATER-SOLUBLE CL AND INSOLUBLE RESIDUE FROM BULK CHONDRITE SAMPLES USING A HIGH-SENSITIVITY MICRO-ANALYTICAL TECHNIQUE DEVELOPED AT THE UNIVERSITY OF NEW MEXICO. ONLY 20 MICROGRAMS OF CL ARE NEEDED FOR AN ANALYSIS MAKING ANALYSES OF RARE METEORITES FEASIBLE. WE WILL ALSO MAKE IN SITU ANALYSES OF WELL CHARACTERIZED CL-BEARING PHASES SODALITE APATITE AND GLASS USING THE UCLA CAMECA IONPROBE. WE WILL USE SODALITE APATITE AND SYNTHETIC GLASS STANDARDS DEVELOPED IN OUR FACILITY TO AVOID INSTRUMENT FRACTIONATIONS. IN OUR ORIGINAL WORK (NATURE 446 1062-1065) WE FOUND THAT THE SODALITE IN ALLENDE CHONDRITE WAS OVER 1 PER MIL LIGHTER THAN THE BULK SAMPLE. IF UPON FURTHER EXAMINATION THESE DATA ARE CONFIRMED IT SUGGESTS THAT THERE WAS AN EARLY HIGH TEMPERATURE FRACTIONATION BETWEEN NACL (GAS) AND HCL (GAS) PRESENT IN SUB-EQUAL AMOUNTS THAT RESULTED IN TWO DISTINCT CL RESERVOIRS. BY ANALYZING A DIVERSE SUITE OF METEORITES WE WILL BE ABLE TO DETERMINE IF THERE IS A CORRELATION BETWEEN CL ISOTOPE VALUES AND OTHER GEOCHEMICAL INDICATORS SUCH AS 17-O ANOMALIES. THREE YEARS OF FUNDING ARE REQUESTED FORMING THE MAJOR PART OF A GRADUATE STUDENT'S THESIS. AFTER HAVING SPENT SEVERAL YEARS IN DEVELOPMENT AND TESTING WE HAVE ARRIVED AT A POINT WHERE CL ISOTOPE MEASUREMENTS CAN BE MADE RAPIDLY ON SMALL AMOUNTS OF MATERIAL AND WITH A HIGH DEGREE OF ACCURACY. BY STUDYING A LARGE NUMBER OF PRIMITIVE CHONDRITIC METEORITES WE EXPECT TO BE ABLE TO DEFINE THE FULL RANGE OF CL ISOTOPE VARIATION IN THIS GROUP AND TO EVALUATE THE DATA IN TERMS OF PETROLOGIC TYPE WITH THE ULTIMATE GOAL OF UNDERSTANDING CL-BEARING PHASE RELATIONS IN THE EARLY SOLAR NEBULA.