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DOI | 10.1029/2019GL084810 |
Fractional Crystallization of Martian Magma Oceans and Formation of a Thermochemical Boundary Layer at the Base of the Mantle | |
Zeff, G.; Williams, Q. | |
2019-10-29 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
文章类型 | Article;Early Access |
语种 | 英语 |
国家 | USA |
英文摘要 | We examine the fractional crystallization of intermediate depth (similar to 160-260 km), impact-induced magma oceans on Mars, and find that residual liquids become denser than normal Martian mantle. Fractional crystallization near 3 GPa establishes inverted density distributions that can generate melt descent within the mantle. Liquid compositions produced by similar to 45-80 wt% crystallization become dense enough to descend to the core-mantle boundary and could form a stably stratified thermochemical boundary layer (TCBL). If this layer crystallizes, its mineralogy would be dominated by either garnet and ferropericlase or stishovite and ringwoodite. Although the size of Mars' core remains uncertain, the addition of such a thermal boundary layer would impede stabilization of (Mg, Fe)SiO3-perovskite at the base of the mantle. A TCBL would both elevate the inferred temperature of the core and inhibit heat flow out of the core, with a potentially causal relation with the current lack of an internally generated Martian magnetic field. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000493039300001 |
WOS关键词 | SYSTEM MG4SI4O12-MG3AL2SI3O12 ; OXYGEN FUGACITY ; HIGH-PRESSURES ; LARGE IMPACTS ; MARS ; CONVECTION ; MELT ; CONSTRAINTS ; TRANSITIONS ; STABILITY |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/187828 |
专题 | 气候变化 |
作者单位 | Univ Calif Santa Cruz, Dept Earth & Planetary Sci, Santa Cruz, CA 95064 USA |
推荐引用方式 GB/T 7714 | Zeff, G.,Williams, Q.. Fractional Crystallization of Martian Magma Oceans and Formation of a Thermochemical Boundary Layer at the Base of the Mantle[J]. GEOPHYSICAL RESEARCH LETTERS,2019. |
APA | Zeff, G.,&Williams, Q..(2019).Fractional Crystallization of Martian Magma Oceans and Formation of a Thermochemical Boundary Layer at the Base of the Mantle.GEOPHYSICAL RESEARCH LETTERS. |
MLA | Zeff, G.,et al."Fractional Crystallization of Martian Magma Oceans and Formation of a Thermochemical Boundary Layer at the Base of the Mantle".GEOPHYSICAL RESEARCH LETTERS (2019). |
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