Experimental Constraints on Ferropericlase (Mg, Fe)O Melt Viscosity Up to 70GPa

被引：2

作者：

Du, Zhixue ^{[1
,2
]}

Deng, Jie ^{[1
]}

Lee, Kanani K. M. ^{[1
]}

机构：

[1] Yale Univ, Dept Geol & Geophys, New Haven, CT 06520 USA

[2] Carnegie Inst Sci, Geophys Lab, Washington, DC 20005 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2017年 / 44卷 / 24期

基金：

美国国家科学基金会;

关键词：

melt viscosity; magma ocean; high pressure; diamond anvil cell; dendrites; diffusion; HIGH-PRESSURE; TRANSPORT-PROPERTIES; MG2SIO4; LIQUID; GIANT IMPACT; MAGMA; MANTLE; DIFFERENTIATION; DIFFUSION; FAYALITE; SYSTEM;

D O I：

10.1002/2017GL076177

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

During Earth's accretion, Earth's mantle is expected to have been a magma ocean due to large impacts. As such, properties of molten mantle materials are key to understanding Earth's thermochemical evolution. However, due to experimental challenges, transport properties at lower mantle pressures, particularly viscosity, are poorly constrained for mantle melts. In this study, we use quenched dendritic textures to estimate melt viscosities at high pressures for (Mg, Fe)O ferropericlase, one of the major components of the mantle. We find that the viscosity of (Mg, Fe)O melt near liquidus temperatures is similar to 10(-3)-10(-2)Pas over the pressure range of 3-70GPa, which is similar to 1-2 orders of magnitude lower than previous results for Si-rich melts at similar conditions. This may have implications for magma ocean cooling and thermochemical evolution of the mantle.

引用

页码：12190 / 12196

页数：7

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