Other
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58.2135w&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 58, Issue 9, pp.2135-2141
Other
7
Scientific paper
A small geometry ion microprobe (Cameca ims 4f) has been successfully used for the routine measurement of 207 Pb / 206 Pb ratios in individual zircons with a spatial resolution of -20 m. In spite of the lower sensitivity of the small ion microprobe, resulting from operating at high mass resolution (M/ M > 4600) in order to resolve isobaric molecular interferences, we can discern Archean components whose ages differ by 50 Ma. A single measurement requires 90 min of data acquisition; thus, a comprehensive study of a zircon population can be accomplished in a few days. Three sets of Precambrian zircons, analyzed earlier by other techniques, yielded ages which are within ± 2 of their "true" values. As our first "unknown" we analyzed zircons from a sample of orthogneiss collected from the Aravalli Craton of northwestern India. For this sample, we obtained a minimum age of 3281 ± 3 Ma (1 ), which we believe closely approximates the time of crystallization of the gneiss's igneous protolith.
Goswami Jitendra N.
Wiedenbeck Mark
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