 |
| Titel |
Kinetics Of Bridgmanite To (Mg0.85,Fe0.15)SiO3-Post-Perovskite Towards A Better Comprehension Of The D” Layer |
| VerfasserIn |
Christopher Langrand, Nadège Hilairet, Denis Andraut, Zuzana Konopkova, Sébastien Merkel |
| Konferenz |
EGU General Assembly 2017
|
| Medientyp |
Artikel
|
| Sprache |
en
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250145391
|
| Publikation (Nr.) |
 EGU/EGU2017-9329.pdf |
|
|
|
|
|
| Zusammenfassung |
| Phase transitions are important to constrain the nature of discontinuities in the deep mantle.
Among them, the transition from Bridgmanite to (Mg0.85,Fe0.15)SiO3-Post-Perovskite (pPv)
is relevant for understanding the thermal and chemical state of the D” layer.
Here, we investigate the kinetics of the Bridgmanite to pPv transition by time-series
experiments in the Laser Heated Diamond Anvil Cell (LHDAC) conducted at the P02.2
beamline of the PETRA III synchrotron. Product phases and extent of transformation are
monitored in-situ as a function of time at pressure and temperature ranging from 126.5 to
130.5 GPa and from 1600 to 2500 K, respectively. The data were analyzed with the Avrami
model of nucleation and growth in order to determine the properties of this phase
transition.
Apparent activation energy could be extracted (Ea≈238 kJ.mol−1). Moreover, based on
our data, we will present two possible kinetic models to constrain the dynamics
and kinetics of the Bridgmanite to pPv transition at the D” layer P/T conditions. |
|
|
|
|
|
|