UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

The top-down crystallisation of Mercury's core

Edgington, AL; Vočadlo, L; Stixrude, L; Wood, IG; Dobson, DP; Holmström, E; (2019) The top-down crystallisation of Mercury's core. Earth and Planetary Science Letters , 528 , Article 115838. 10.1016/j.epsl.2019.115838. Green open access

[thumbnail of Edgington_revised AAM_Corrected version Edgington_The Top-Down Crystallisation of Mercury's core.pdf]
Preview
Text
Edgington_revised AAM_Corrected version Edgington_The Top-Down Crystallisation of Mercury's core.pdf - Accepted version

Download (1MB) | Preview

Abstract

The regime governing the growth of Mercury's core is unknown, but the dynamics of core growth are vital to understanding the origin and properties of the planet's weak magnetic field. Here, we use advanced first-principles methods, which include a magnetic entropy contribution, to investigate the magnetic and thermo-elastic properties of liquid Fe-S-Si and of pure liquid iron at the conditions of Mercury's core. Our results support a ‘top-down’ evolution of the core, whereby solid iron-rich material crystallises at shallow depths and sinks. This process would likely result in a compositionally driven dynamo within a stably stratified uppermost liquid layer, providing an explanation for the observed properties of the weak magnetic field of Mercury.

Type: Article
Title: The top-down crystallisation of Mercury's core
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.epsl.2019.115838
Publisher version: https://doi.org/10.1016/j.epsl.2019.115838
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: planetary science, Mercury, core evolution, planetary interiors, top-down crystallization, iron alloys
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/10082754
Downloads since deposit
45Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item