Zircon growth in UHT leucosome: constraints from zircon-garnet rare earth elements (REE) relations in Napier Complex, East Antarctica

Constraints on Hadean zircon protoliths from oxygen isotopes, Ti-thermometry, and rare earth elements

[1] We report zircon oxygen isotope ratios and reconnaissance Ti-in-zircon concentrations, guided by cathodoluminescence image studies, for detrital zircons up to 4.34 Ga from the Narryer Gneiss Complex of Western Australia. Zircon oxygen isotope results bolster the view that some Hadean (>3.85 Ga) zircon source melts were enriched in heavy oxygen, a sensitive proxy for melt contamination by se...

U^Pb isotopic behaviour of zircon during upper-amphibolite facies £uid in¢ltration in the Napier Complex, east Antarctica

Understanding the factors that contribute to U^Pb discordance in zircon is essential for interpreting isotopic data and for assessing the validity of concordia intercept ages. Modification caused by interaction with metamorphic fluids is often cited as a primary means by which significant or even complete isotopic resetting of U^Pb systematics in zircon might be achieved under subsolidus condit...

Lu−Hf systematics of the ultra-high temperature Napier Complex, East Antarctica: Evidence for the early Archean differentiation of Earth’s mantle

systematics of the ultra-high temperature Napier Complex, East Antarctica: Evidence for the early Archean differentiation of Earth's mantle" (2007). Related Publications from ANDRILL Affiliates. Paper 15. Figure 1. Outcrop map of the western Napier Complex, East Antarctica. Areas of outcrop are indicated in black. The approximate extent of UHT mineral assemblages (UHT-zone) is indicated by the ...

Age and duration of ultrahigh-temperature metamorphism in the Anápolis–Itauçu Complex, Southern Brası́lia Belt, central Brazil – constraints from U–Pb geochronology, mineral rare earth element chemistry and trace-element thermometry

Integrated petrographic and chemical analysis of zircon, garnet and rutile from ultrahigh-temperature (UHT) granulites in the Anápolis–Itauçu Complex, Brazil, is used to constrain the significance of zircon ID-TIMS U–Pb geochronological data. Chondrite-normalized rare earth element (REE) profiles of zircon cores have positive-sloping heavy-REE patterns, commonly inferred to be magmatic, whereas...

Zircon from the Moon , Earth and Mars