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U-Pb analysis of sample 88GC275

Dates

Dataset Reference Date
2020-12-28
Info Date
1988

Summary

After HCl dissolution, the zircon solution is aliquoted and spiked with 208Pb/235U tracer. The Pb/U ratio of this spike has been calibrated to +/- 0.4% by comparison with NBS trtace-element glasses. Chemical isolation follows the procedure outlined by Krogh (1973), except that 200-to 400-mesh AG 1X8 ion-exchange resin is used for better retention. The samples are loaded with H3PO4 and silica gel (for Pb and most U) or graphite (for some U) onto degassed Re filaments. U was run with graphite as U metal initially, and later with silica gel as UO2. UO2 is run together with the spiked Pb aliquit on the same filament, with PB iionizing at a slightly lower temperature than that for U. The mass spectrometer utilized is a VG-354 equipped with [...]

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Material Request Instructions

For the publication containing sample radiometric age data, see: https://dggs.alaska.gov/pubs/id/17423

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  • ReSciColl Archive

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Type Scheme Key
title Parent-4f4e49d8e4b07f02db5df185 U-Pb analysis of sample 88GC275

NGGDPP Item Extension

alternateGeometryThe coordinates are represented in North American Datum of 1927 (NAD27). Location was derived from the following method(s): Location provided in Gehrels, G.E., et al., 1991, CJES, v. 28, p. 902

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