A deeper and hotter Martian core-mantle differentiation inferred from FeO partitioning  

FeO的分配指示火星更深更热的核慢分异过程

作　　者：Yunguo Li Chunhui Li You Zhou Yun Liu Huaiwei Ni 李云国;李春辉;周游;刘耘;倪怀玮

机构地区：[1]State Key Laboratory of Lithospheric and Environmental Coevolution,University of Science and Technology of China,Hefei 230026,China [2]Deep Space Exploration Laboratory/School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China [3]Research Centre for Planetary Science,College of Earth and Planetary Sciences,Chengdu University of Technology,Chengdu 610059,China [4]State Key Laboratory of Ore Deposit Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China

出　　处：《Science Bulletin》2025年第3期429-436,共8页科学通报(英文版)

基　　金：the Strategic Priority Research Program(B)of the Chinese Academy of Sciences(XDB41000000);the Program for Innovative Research Team of USTC(WK3410000019);support of the National Natural Science Foundation of China(42322201,42173040);the support from CAs Hundred Talents Program.You Zhou acknowledges the support of the National Natural Science Foundation of China(41973063,42241142);computing system in the Supercomputing Center of University of Science and Technology of China.

摘　　要：The core-mantle differentiation process plays a pivotal role in redistributing material on a massive scale,shaping the long-term evolution of rocky planets.Understanding this process is crucial for gaining insights into the accretion and evolution of planets like Mars.However,the details of Mars’s core-mantle differentiation remain poorly understood due to limited compositional data for its core and mantle.In this study,we aim to constrain the Martian core-mantle differentiation by examining FeO partitioning between core and mantle materials,incorporating improved Martian compositional data from the InSight mission.Using ab initio thermodynamic techniques,we calculated the FeO partition coefficient between liquid iron and silicate melt.Our results align with previous studies while also clarifying the factors affecting partitioning behavior.Based on these findings and estimates of oxygen concentration in the core,we infer that Mars’s core and mantle likely differentiated at temperatures above 2440 K and pressures ranging from 14 to 22 GPa.Although these estimates are higher than previously reported,they are consistent with observed abundances of moderately siderophile elements and Mars’s accretion models.

关 键 词：MARS Core-mantle differentiation VOLATILE Partitioning 

分 类 号：P185.3[天文地球—天文学]