A reconnaissance ion-probe study of hafnium isotopes in zircons

Details A reconnaissance ion-probe study of hafnium isotopes in zircons A reconnaissance ion-probe study of hafnium isotopes in zircons

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55..849k&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 55, March 1991, p. 849-859.

Computer Science

13

Chondrites, Hafnium Isotopes, Ion Probes, Petrography, Rock Mechanics, Zirconium Isotopes, Geochronology, Lead (Metal), Lutetium Isotopes, Mass Spectroscopy, Mineralogy, Uranium

Scientific paper

An account is given of the use of a secondary ion mass spectrometry (SIMS) technique for the isotopic analysis of Hf in zircons, using the Sensitive High Mass Resolution Ion Microprobe ('SHRIMP') to measure the unfractionated (chondritic) initial Hf isotopic compositions on a number of Archaean zircon populations. An increasing involvement of isotopically evolved depleted mantle sources in the formation of younger crust is noted. SHRIMP U-pb analyses of zircons from Archaean tonalitic gneiss at Watersmeet, Michigan, yield a precise crystallization age of 3636 + or - 6 Ma (2-sigma), and indicate that a previous correlation between Hf-176/Hf-177 and U-Pb isotopic discordance in bulk zircon samples was caused by the addition of radiogenic Hf in discrete overgrowths of new zircon.

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