 |
HAL - OMP |  |
|
HAL - OMP | |
| HAL : hal-00613178, version 1 |
| DOI : 10.1126/science.1192448 |
| Fiche détaillée |  Récupérer au format |
 |
| Science 329 (2010) 1516 |
|
|
|
|
| Melting of Peridotite to 140 Gigapascals |
|
|
| G. Fiquet 1A. L. Auzende 1 |
|
|
| (2010) |
|
|
|
| Interrogating physical processes that occur within the lowermost mantle is a key to understanding Earth's evolution and present-day inner composition. Among such processes, partial melting has been proposed to explain mantle regions with ultralow seismic velocities near the core-mantle boundary, but experimental validation at the appropriate temperature and pressure regimes remains challenging. Using laser-heated diamond anvil cells, we constructed the solidus curve of a natural fertile peridotite between 36 and 140 gigapascals. Melting at core-mantle boundary pressures occurs at 4180 T 150 kelvin, which is a value that matches estimated mantle geotherms. Molten regions may therefore exist at the base of the present-day mantle. Melting phase relations and element partitioning data also show that these liquids could host many incompatible elements at the base of the mantle. |
|
|
|
|
|
|
|
|
|
|
|
| 1 : | Institut de minéralogie et de physique des milieux condensés (IMPMC) |
|
|
|
CNRS : UMR7590 – IPG PARIS – Université Pierre et Marie Curie [UPMC] - Paris VI – Université Paris VII - Paris Diderot |
|
|
| 2 : | Institut de Physique du Globe de Paris (IPGP) |
|
|
|
CNRS : UMR7154 – INSU – IPG PARIS – Université Pierre et Marie Curie [UPMC] - Paris VI – Université Paris VII - Paris Diderot – Université de la Réunion |
|
|
| 3 : | Dynamique terrestre et planétaire (DTP) |
|
|
|
CNRS : UMR5562 – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier [UPS] - Toulouse III |
|
|
| 4 : | Department of Earth and Planetary Sciences, Tokyo Institute of Technology |
|
|
|
Department of Earth and Planetary Sciences |
|
|
| 5 : | European Synchrotron Radiation Facility (ESRF) |
|
|
|
ESRF |
|
|
|
|
|
|
|
|
|
| Domaine | : | Planète et Univers/Sciences de la Terre/Minéralogie |
| hal-00613178, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00613178 | |
| oai:hal.archives-ouvertes.fr:hal-00613178 | |
| Contributeur : Danielle Thomas | |
| Soumis le : Mercredi 3 Août 2011, 11:28:31 | |
| Dernière modification le : Mercredi 3 Août 2011, 11:28:31 | |
