| タイトル | Evidence for extreme mantle fractionation in early Archaean ultramafic rocks from northern Labrador |
| 著者（英） | Palacz, Zenon A.; Campbell, Lisa M.; Collerson, Kenneth D.; Weaver, Barry L. |
| 著者所属（英） | VG Isotech|California Univ.|Oklahoma Univ. |
| 発行日 | 1991-01-17 |
| 言語 | eng |
| 内容記述 | Samarium-neodymium isotope data for tectonically interleaved fragments of lithospheric mantle and meta-komatiite from the North Atlantic craton provide the first direct record of mantle differentiation before 3,800 Myr ago. The results confirm the magnitude of light-rare-earth-element depletion in the early mantle, and also its depleted neodymium isotope composition. The mantle fragments were able to retain these ancient geochemical signatures by virtue of having been tectonically incorporated in buoyant felsic crust, thus escaping recycling and homogenization by mantle convection. |
| NASA分類 | GEOPHYSICS |
| レポートNO | 91A23506 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/350362 |
|
