地核中的轻元素及其地核动力学意义  

Light elements in the Earth’s core and implications for core dynamics

作　　者：黄钰倩 蒋刚[1] 张友君 HUANG Yu-qian;JIANG Gang;ZHANG You-jun(Institute of Atomic and Molecular Physics,Sichuan University,Chengdu 610065,China;International Center for Planetary Science,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]四川大学原子与分子物理研究所,成都610065 [2]成都理工大学行星科学国际研究中心,成都610059

出　　处：《矿物岩石地球化学通报》2025年第1期51-71,I0003,共22页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金资助项目(42074098)。

摘　　要：地核,作为地球最深处的关键圈层,分为熔融外核和固态内核。地震学与宇宙化学观测揭示地核主要由铁镍合金和一定量轻元素组成,比如硫、硅、氧、碳和氢等。这些轻元素的存在有助于解释地核的密度亏损,为地核的对流提供能量。明确地核中轻元素的种类、含量及铁-轻元素合金的物理性质,对理解地核对流、内核结晶和各向异性等动力学问题至关重要。本文探讨了高温高压条件下铁-轻元素合金的密度、声速和相图关系,为地核轻元素的成分和含量提出限定。从地核凝固行为、电-热输运性质和内核各向异性等方面探讨了地核中的轻元素对地核的物理性质和动力学过程的影响,强调了精确限定地核轻元素组成和分布的重要性。The Earth′s core,as the deepest layer,consists of a liquid outer core and a solid inner core.Seismological and cosmochemical observations revealed that the core is primarily composed of an iron-nickel alloy and a certain amount of light elements including S,Si,O,C and H.The presence of these light elements are helpful to explain the density deficit of the core and to provide energy for the convection in the core.Determining the types and contents of light elements,as well as the physical properties of iron-light element alloys,is crucial for understanding the core dynamics,such as core convection,crystallization,and the anisotropy of the inner core.Here,in order to provide constraints on the content of light elements in the core,we have discussed the density,sound velocity,and phase diagrams of iron-light element alloys under high temperature and high pressure conditions.We have also explored the effects of light elements on the core's physical properties and dynamic processes,including solidification behavior,electrical and thermal transport properties,and the anisotropy of the inner core.Furthermore,we have emphasized the critical importance of accurately determining the composition and distribution of light elements within the core.

关 键 词：地核轻元素 高温-高压物性 内核结晶 地核动力学 

分 类 号：P591.2[天文地球—地球化学]