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2006 | OriginalPaper | Chapter

Electron Microprobe (EMP) Dating on Monazite from Forefinger Point Granulites, East Antarctica: Implication for Pan-African Overprint

Authors : Yoichi Motoyoshi, Tomokazu Hokada, Kazuyuki Shiraishi

Published in: Antarctica

Publisher: Springer Berlin Heidelberg

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Electron microprobe (EMP) dating on monazite in granulite-facies rocks from Forefinger Point, East Antarctica, yielded dominant ages of ∼500 Ma on matrix monazites. They are associated with secondary cordierite, biotite and sapphirine, formed during nearly isothermal decompression after the high

P-T

assemblages involving garnet, orthopyroxene and sillimanite. Older ages around 750–1000 Ma are detected in monazite cores and in monazite inclusions in garnet porphyroblast. Combining the available age data and the reaction textures, it becomes evident that the Forefinger Point granulites have been overprinted by a granulite-facies decompressional event of Pan-African age. Moreover, EMP monazite dating imply that the Forefinger Point granulites have experienced at least two stages of metamorphic evolution.

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Metadata
Title
Electron Microprobe (EMP) Dating on Monazite from Forefinger Point Granulites, East Antarctica: Implication for Pan-African Overprint
Authors
Yoichi Motoyoshi
Tomokazu Hokada
Kazuyuki Shiraishi
Copyright Year
2006
Publisher
Springer Berlin Heidelberg
DOI
https://doi.org/10.1007/3-540-32934-X_8