Journal ArticleDOI
Age significance of U-Th-Pb zircon data from early Archaean rocks of west Greenland - a reassessment based on combined ion-microprobe and imaging studies - reply
TLDR
In this paper, the geochronological evolution of early Archaean gneisses from southern West Greenland is reassessed using the well-established cathodoluminescence imaging method both to reveal previously undocumented complex zircon growth histories and to control positioning of ion-microprobe U-Th-Pb analyses.About:
This article is published in Chemical Geology.The article was published on 1999-08-10. It has received 516 citations till now. The article focuses on the topics: Zircon & Akilia.read more
Citations
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Journal ArticleDOI
Plesovice zircon : A new natural reference material for U-Pb and Hf isotopic microanalysis
Jirri Slama,Jirri Slama,Jirri Slama,Jan Košler,Daniel J. Condon,James L. Crowley,Axel Gerdes,John M. Hanchar,Matthew S.A. Horstwood,George A. Morris,Lutz Nasdala,Nicholas Norberg,Urs Schaltegger,Blair Schoene,Michael Tubrett,Martin J. Whitehouse +15 more
TL;DR: The Plesovice zircon as discussed by the authors has a concordant U-Pb age with a weighted mean Pb-206/U-238 date of 337.13 +/- 0.37 Ma (ID-TIMS, 95% confidence limits, including tracer calibration uncertainty).
Journal ArticleDOI
Atlas of Zircon Textures
TL;DR: In this paper, a selection of both the most typical, but also of the less common, features seen in zircon, categorized according to the different geological processes responsible for their formation are presented.
Journal ArticleDOI
Precise determination of Phanerozoic zircon Pb/Pb age by multicollector SIMS without external standardization
TL;DR: In this article, a new generation of large radius magnetic sector multicollector Cameca IMS-1280 SIMS was used to date Phanerozoic zircons.
Journal ArticleDOI
Using hafnium and oxygen isotopes in zircons to unravel the record of crustal evolution
Chris J. Hawkesworth,AJ Kemp +1 more
TL;DR: In this article, an integrated approach is explored with new data from the Lachlan Fold Belt in south-east Australia. And the results show that the ages of zircons with high δ18O values (greater than 6.5‰) peak at about 1.8-2.0 Ga.
Journal ArticleDOI
The generation and evolution of the continental crust
Chris J. Hawkesworth,Chris J. Hawkesworth,Bruno Dhuime,Anna Pietranik,Peter A. Cawood,Anthony I.S. Kemp,Craig Storey,Craig Storey +7 more
TL;DR: The continental crust is the archive of the geological history of the Earth and only 7% of the crust is older than 2.5 Ga, and yet significantly more crust was generated before than subsequently.
References
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Journal ArticleDOI
Approximation of terrestrial lead isotope evolution by a two-stage model
J.S. Stacey,Jan Kramers +1 more
TL;DR: In this paper, a two-stage model for terrestrial lead isotope evolution is proposed, which permits the age of the earth to be that of the meteorite system and also yields good model ages for samples of all ages.
Journal ArticleDOI
Three natural zircon standards for u‐th‐pb, lu‐hf, trace element and ree analyses
M. Wiedenbeck,P. Allé,Fernando Corfu,William L. Griffin,M. Meier,F. Oberli,A. von Quadt,J.C. Roddick,W. Spiegel +8 more
TL;DR: In this paper, the results of a study to develop natural zircon geochemical standards for calibrating the U-(Th)-Pb geochronometer and Hf isotopic analyses are reported.
Journal ArticleDOI
Zircon saturation revisited: temperature and composition effects in a variety of crustal magma types
E. Bruce Watson,T. Mark Harrison +1 more
TL;DR: In this article, the saturation behavior of zircon in crustal anatectic melts as a function of both temperature and composition has been studied and a model of Zr solubility given by: In D Zr Zircon/melt = −3.80−[0.85(M−1)]+12900/T where T is the absolute temperature, and M is the cation ratio (Na + K + 2Ca)/(Al · Si).
Journal ArticleDOI
Evidence for life on Earth before 3,800 million years ago.
Stephen J. Mojzsis,Gustaf Arrhenius,Kevin D. McKeegan,T. M. Harrison,Allen P. Nutman,Clark R.L. Friend +5 more
TL;DR: In this article, ion-microprobe measurements of the carbon-isotope composition of carbonaceous inclusions within grains of apatite (basic calcium phosphate) from the oldest known sediment sequences a approx. 3,800 Myr-old banded iron formation from the Isua supracrustal belt, West Greenland and a similar formation from Akilia island that is possibly older than 3,850 Myr.
Journal ArticleDOI
Isotopic evidence for the Precambrian provenance and Caledonian metamorphism of high grade paragneisses from the Seve Nappes, Scandinavian Caledonides: II. Ion microprobe zircon U-Th-Pb
Ian S. Williams,Stefan Claesson +1 more
TL;DR: In this article, an ion microprobe U-Th-Pb analysis of residual cores and metamorphic mantles of zircons from three high grade paragneisses from the Seve Nappe Complex, north-western Sweden, showed that the sediments comprising the protolith of the gneisses over a distance of 250 km were probably derived from similarly-aged source terranes.
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Approximation of terrestrial lead isotope evolution by a two-stage model
J.S. Stacey,Jan Kramers +1 more