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U-Pb analysis of sample 77Dn074

Dates

Dataset Reference Date
2020-12-28
Info Date
1977

Summary

Isotopic analyses were performed on 1- to 9-mg zircon fractions by using an extraction method similar to that described by Krogh (1973). A mixed 205Pb-235U spike was used and isotopic neasurements were done on a 35-cm-radius, 90 degree-sector, single-focusing, solid-source Avco mass spectrometer. The standard silica get-H3PO4 emitter technique was used for lead isotopec determination; the uranium isotopes were measured by using the graphite-H3PO4 emitter technique.

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For the publication containing sample radiometric age data, see: https://dggs.alaska.gov/pubs/id/415

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  • ReSciColl Archive

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Type Scheme Key
title Parent-4f4e49d8e4b07f02db5df185 U-Pb analysis of sample 77Dn074

NGGDPP Item Extension

alternateGeometryThe coordinates are represented in North American Datum of 1927 (NAD27). Location was derived from the following method(s): Provided by source document

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