Ion microprobe identification of 4,100-4,200 Myr-old terrestrial zircons

Details Ion microprobe identification of 4,100-4,200 Myr-old terrestrial zircons Ion microprobe identification of 4,100-4,200 Myr-old terrestrial zircons

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.304..616f&link_type=abstract

Nature (ISSN 0028-0836), vol. 304, Aug. 18, 1983, p. 616-618.

Computer Science

94

Geochronology, Ion Probes, Mineralogy, Radioactive Age Determination, Zirconium Compounds, Australia, Lead Isotopes, Metamorphic Rocks, Quartz, Silicates

Scientific paper

The existence of detrital zircons from Western Australia which are far older than any known terrestrial rocks is reported. The ion microprobe SHRIMP was used to obtain zircon concentrations from Archean metasediments at Mt Narryer, a locality near which orthogneisses of 3630 + or -40 Myr occur. Grain-by-grain measurements of one particular concentrate revealed four zircons having near-concordant U-Pb ages between 4100 and 4200 Myr, in striking contrast to most grains, whose ages are about 3750 and 3500 Myr. These results show that pre-3800 Myr silica-saturated rocks were present on the earth's crust.

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