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Article

Geochemical Characterization of Zircon in Fyfe Hills of the Napier Complex, East Antarctica

1
National Institute of Polar Research, 10-3, Midori-cho, Tachikawa-shi, Tokyo 190-8518, Japan
2
Department of Polar Sciences, The Graduate University for Advanced Studies, SOKENDAI, 10-3, Midori-cho, Tachikawa-shi, Tokyo 190-8518, Japan
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(11), 943; https://doi.org/10.3390/min10110943
Received: 11 September 2020 / Revised: 22 October 2020 / Accepted: 23 October 2020 / Published: 23 October 2020
Ultra-high temperature (UHT) metamorphism plays an essential role in the development and stabilization of continents through accretionary and collisional orogenesis. The Napier Complex, East Antarctica, preserves UHT metamorphism, and the timing is still debated. U–Pb zircon geochronology integrated with rare earth element (REE) and oxygen isotope was applied to a garnet-bearing quartzo-feldspathic gneiss to confirm the timing of UHT metamorphism in Fyfe Hills in the western part of the Napier Complex. The zircons are analyzed using a sensitive high-resolution ion microprobe (SHRIMP). The cathodoluminescence observation and U–Pb ages allowed us to classify the analytical domains into three types: inherited domains (Group I), metamorphic domains (Group II), and U–Pb system disturbed domains (Group III). The REE patterns of Group II are characterized by a weak fractionation between the middle REE and heavy REE, which reinforces the above classification. The 207Pb*/206Pb* ages of Group II have an age peak at 2501 Ma, therefore, the gneiss experienced high temperature metamorphism at 2501 Ma. δ18O of zircons are homogeneous among the three groups (5.53 ± 0.11‰, 5.51 ± 0.14‰, and 5.53 ± 0.23‰), which suggests re-equilibration of oxygen isotopes after metamorphism at ca. 2501Ma under dry UHT conditions. View Full-Text
Keywords: U–Pb geochronology; zircon; REE pattern; δ18O; Napier Complex U–Pb geochronology; zircon; REE pattern; δ18O; Napier Complex
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MDPI and ACS Style

Takehara, M.; Horie, K.; Hokada, T. Geochemical Characterization of Zircon in Fyfe Hills of the Napier Complex, East Antarctica. Minerals 2020, 10, 943. https://doi.org/10.3390/min10110943

AMA Style

Takehara M, Horie K, Hokada T. Geochemical Characterization of Zircon in Fyfe Hills of the Napier Complex, East Antarctica. Minerals. 2020; 10(11):943. https://doi.org/10.3390/min10110943

Chicago/Turabian Style

Takehara, Mami, Kenji Horie, and Tomokazu Hokada. 2020. "Geochemical Characterization of Zircon in Fyfe Hills of the Napier Complex, East Antarctica" Minerals 10, no. 11: 943. https://doi.org/10.3390/min10110943

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