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Zircons in ultra-high-temperature (UHT) metamorphosed paragneisses from Mt. Riiser-Larsen in the Napier Complex, East Antarctica, were dated by using ion microprobe (SHRIMP) and electron microprobe (EMP). Both SHRIMP and EMP analyses yield consistent 25202460Ma age populations for garnetorthopyroxene-bearing paragneiss and leucosomes enclosed within. The peak UHT event was dated at 2480Ma by SHRIMP...
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