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- W2082210367 abstract "Abstract SHRIMP U–Pb analyses are reported for a detrital zircon population from a sample of sillimanite-bearing quartzite from the Narryer sedimentary succession in the Narryer Terrane of the northwestern Yilgarn Craton. The detrital zircons define two distinctive age groups, an older group from 4000 Ga to 4280 Ma and a younger group from 3750 to 3250 Ma. The abundance of older group zircons of about 12% far exceeds the abundance of about 2% reported in the first discovery of ancient zircons in a quartzite from the Narryer metasediments, and is equivalent to the abundance of >3900 Ma zircons in metaconglomerate sample W74 from the Jack Hills, confirmed by new measurements reported in this paper. Most analyses of the Narryer and the Jack Hills detrital zircon populations are discordant. The Jack Hills zircon analyses are dominated by strong recent Pb loss whereas the Narryer zircon analyses have had a more complex history and have experienced at least one Pb loss event, possibly associated with the high-grade metamorphism at ca. 2700 Ma, and a further disturbance of the U–Pb systems during relatively recent times. Although the number of analyses is limited and many of the zircon analyses are discordant, the age distributions of the older (>3900 Ma) zircons from the Narryer and Jack Hills samples are different, suggesting a complex provenance for the ancient zircons. The distribution of ages in the younger population of Mt Narryer zircons is similar to that reported for zircons from the surrounding Meeberrie gneiss, supporting previous suggestions that zircons from the gneisses or their precursors were a major contributor to the detrital zircon suite. The younger zircon population from Jack Hills sample (W74), lacks the strong age peak from 3600 to 3750 Ma present in the Narryer zircon population, and conversely the strong zircon age group at ca. 3350–3500 Ma in the Jack Hills population is only weakly represented in the Narryer zircon population. The age distributions for the Narryer and the Jack Hills zircon populations are taken as benchmarks for comparing zircon populations from quartzite occurrences elsewhere in the Yilgarn Craton." @default.
- W2082210367 created "2016-06-24" @default.
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- W2082210367 date "2006-11-01" @default.
- W2082210367 modified "2023-09-24" @default.
- W2082210367 title "High abundance of early Archaean grains and the age distribution of detrital zircons in a sillimanite-bearing quartzite from Mt Narryer, Western Australia" @default.
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- W2082210367 doi "https://doi.org/10.1016/j.precamres.2006.07.008" @default.
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