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| Main Authors: | , , |
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2007
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| Online Access: | https://doi.org/10.1594/PANGAEA.605212 |
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| _version_ | 1867169905206362112 |
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| author | Motoyoshi, Yoichi Hokada, Tomokazu Shiraishi, Kazuyuki |
| author_facet | Motoyoshi, Yoichi Hokada, Tomokazu Shiraishi, Kazuyuki |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_605212 |
| institution | PANGAEA |
| language | en |
| publishDate | 2007 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Age determination on monazite from Forefinger Point granulites, East Antarctica (Table 2.6-1) Motoyoshi, Yoichi Hokada, Tomokazu Shiraishi, Kazuyuki Age, dated; Age, error; Casey Bay, East Antarctica; Electron microprobe (EMP); Forefinger_Point; Lead oxide; ORDINAL NUMBER; OUTCROP; Outcrop sample; Sample code/label; Thorium oxide; Uranium dioxide 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. |
| title | Age determination on monazite from Forefinger Point granulites, East Antarctica (Table 2.6-1) |
| topic | Age, dated; Age, error; Casey Bay, East Antarctica; Electron microprobe (EMP); Forefinger_Point; Lead oxide; ORDINAL NUMBER; OUTCROP; Outcrop sample; Sample code/label; Thorium oxide; Uranium dioxide |
| url | https://doi.org/10.1594/PANGAEA.605212 |