000005566 001__ 5566
000005566 005__ 20220120122745.0
000005566 037__ $$aCTALK-2022-0014
000005566 100__ $$aEdmund, Eric
000005566 245__ $$aThe Fe-FeSi Phase Diagram at Mercury’s Core Conditions
000005566 260__ $$c2021
000005566 269__ $$c2021-12-16
000005566 520__ $$aMercury’s iron core is expected to contain some quantity of silicon, with estimated Si abundances spanning nearly the entire Fe-FeSi phase diagram. However, at present it is not understood how this phase diagram evolves over the P-T conditions of Mercury’s core. Consequently, the effect of silicon alloying on Mercury’s core crystallization regime, thermal and structural evolution are not well constrained. Here we present an investigation of the Fe-FeSi system over a wide range of Si concentrations (7-30 wt% Si), using laser-heated diamond anvil cells, and combining in situ and ex situ diagnostics. We present a new phase diagram for this system at Mercury’s core conditions – providing new constraints on melting temperatures, solid/liquid partitioning and solid phase relations. In doing so, we show that the unique behaviour of this system can stabilize new mechanisms for structural evolution and crystallization, with no current analogues among terrestrial planets.
000005566 536__ $$a3PRODPLANINT/$$c3PRODPLANINT/$$f3PRODPLANINT
000005566 594__ $$aNO
000005566 6531_ $$aMercury, core, Fe-Si
000005566 700__ $$aMorard, Guillaume
000005566 700__ $$aBaron, Marzena Anna
000005566 700__ $$aRivoldini, Attilio
000005566 700__ $$aYokoo, Shunpei
000005566 700__ $$aBoccato, Silvia
000005566 700__ $$aHirose, Kei
000005566 700__ $$aPakhomova, Anna
000005566 700__ $$aAntonangeli, Daniele
000005566 773__ $$tAGU Fall Meeting 2021, New Orleans, online
000005566 8560_ $$fattilio.rivoldini@observatoire.be
000005566 906__ $$aContributed
000005566 980__ $$aCTALKCONT