Age determination on monazite from Forefinger Point granulites, East Antarctica (Table 2.6-1) ...

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...

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Bibliographic Details
Main Authors: Motoyoshi, Yoichi, Hokada, Tomokazu, Shiraishi, Kazuyuki
Format: Dataset
Language:English
Published: PANGAEA 2007
Subjects:
ORDINAL NUMBER
Sample code/label
Uranium dioxide
Thorium oxide
Lead oxide
Age, dated
Age, error
Outcrop sample
Electron microprobe EMP
Antarc*
Antarctica
East Antarctica
Online Access:https://dx.doi.org/10.1594/pangaea.605212
https://doi.pangaea.de/10.1594/PANGAEA.605212
Description
Summary: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. ... : Supplement to: Motoyoshi, Yoichi; Hokada, Tomokazu; Shiraishi, Kazuyuki (2006): Electron micoprobe (EMP) dating on monazite from Forefinger Point granulites, East Antarctica: Implication for Pan-African overprint. In: Fütterer, D K, Damaske, D, Kleinschmidt, G, Miller, H & Tessensohn, F (eds.), Antarctica: contributions to global earth sciences, Springer, Berlin, Heidelberg, New York, 63-68 ...

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