Synthesis of amorphous MgO-rich peridotitic starting material for laser-heated diamond anvil cell experiments - application to iron partitioning in the mantle

Anne-Line Auzende (1) , Jessy Gillot (2) , Annabelle Coquet (1) , Louis Hennet (3) , Georges Ona-Nguema (1) , Dominique Bonnin (4) , Imene Esteve (1) , Mathieu Roskosz (2) , Guillaume Fiquet (1)

1 IMPMC - Institut de minéralogie et de physique des milieux condensés
2 UMET - Unité Matériaux et Transformations - UMR 8207
3 CEMHTI - Conditions Extrêmes et Matériaux : Haute Température et Irradiation
4 LPQ, ESPCI

We report the preparation of the starting material reflecting the complex composition of the Earth's mantle. With this aim, we synthesized two types of material: sol-gel and glass obtained by aerodynamic levitation. Thanks to their high homogeneity and reactivity, these materials are suitable for experimental petrology under extreme conditions, conducted in laser-heated diamond anvil cell.We then used this mantle analog to investigate the iron partitioning between high pressure phases under lower mantle conditions during solid-state reaction and partial melting of the material. Iron preferentially partitions into the (Mg,Fe)O, but the presence of aluminum slightly enriches iron in the silicate phase (Kpv-fp = 0.41 ± 0.04) compared to similar experiments in an Al-free system

Mots clés: experimental petrology; aerodynamical levitation; peridotite; glass; sol-gel; iron partitioning

Domaines: Minéralogie

Anne-Line Auzende, Jessy Gillot, Annabelle Coquet, Louis Hennet, Georges Ona-Nguema, et al.. Synthesis of amorphous MgO-rich peridotitic starting material for laser-heated diamond anvil cell experiments - application to iron partitioning in the mantle. High Pressure Research, 2011, 31 (1), pp.199-213. ⟨10.1080/08957959.2011.556631⟩. ⟨hal-00613175⟩