Acoustic and electrical properties of Fe-Ti oxides with application to the deep lunar mantle

被引：6

作者：

Pommier, Anne ^{[1
]}

Walter, Michael J. ^{[1
]}

Hao, Ming ^{[1
]}

Yang, Jing ^{[1
]}

Hrubiak, Rostislav ^{[2
]}

机构：

[1] Carnegie Inst Sci, Earth & Planets Lab, Washington, DC 20015 USA

[2] Argonne Natl Lab, Xray Sci Div, High Pressure Collaborat Access Team HPCAT, Lemont, IL 60439 USA

来源：

EARTH AND PLANETARY SCIENCE LETTERS | 2024年 / 628卷

关键词：

Fe -Ti oxides; Ilmenite-bearing cumulates; Lunar mantle; Seismic velocity; Electrical conductivity; ELASTIC-WAVE VELOCITY; HIGH-TEMPERATURE; HIGH-PRESSURES; MAGMA OCEAN; SINGLE-CRYSTAL; CONDUCTIVITY; CONSTRAINTS; ILMENITE; MODEL; MOON;

D O I：

10.1016/j.epsl.2024.118570

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

The overturn of titanium-rich mantle cumulates has been invoked to explain the structure and dynamics of the Moon. These dense cumulates are stable at the core-mantle boundary (CMB) and could explain field observations inferred from geophysical studies. We report acoustic and electrical experiments on natural ilmenite-rutile aggregates up to 4.5 GPa and 1920 K. Seismic velocities show a weak pressure and temperature dependence, with Vs similar to 4.2 (+/-0.2) km/s and Vp similar to 8.0 (+/-0.2) km/s at the CMB conditions. Conductivity increases by a factor of 10(4) from 373 to 1920 K and is >10(3) S/m above 1573 K. Seismic and electrical models for the lunar mantle based on our results, considering mixtures of Fe-Ti oxides and olivine, indicate that field velocity and conductivity estimates are reproduced satisfactorily with 3-16 vol.% Fe-Ti oxides and 20 vol.% melt. Interactions between a Ti-rich, melt-bearing layer and the adjacent core likely affect the cooling and magnetic history of the Moon.

引用

页数：9

共 79 条

[31] Geophysical evidence formelt in the deep lunar interior and implications for lunar evolution [J].

Khan, A. ;

Connolly, J. A. D. ;

Pommier, A. ;

Noir, J. .

JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, 2014, 119 (10) :2197-2221

[32] Toward comprehensive studies of liquids at high pressures and high temperatures: Combined structure, elastic wave velocity, and viscosity measurements in the Paris-Edinburgh cell [J].

Kono, Yoshio ;

Park, Changyong ;

Kenney-Benson, Curtis ;

Shen, Guoyin ;

Wang, Yanbin .

PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 2014, 228 :269-280

[33] P-V-T relation of MgO derived by simultaneous elastic wave velocity and in situ X-ray measurements: A new pressure scale for the mantle transition region [J].

Kono, Yoshio ;

Irifune, Tetsuo ;

Higo, Yuji ;

Inoue, Toru ;

Barnhoorn, Auke .

PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 2010, 183 (1-2) :196-211

[34] Geochemical constraints on the model of the composition and thermal conditions of the Moon according to seismic data [J].

Kuskov, O. L. ;

Kronrod, V. A. .

IZVESTIYA-PHYSICS OF THE SOLID EARTH, 2009, 45 (09) :753-768

[35]

Labrosse S, 2007, NATURE, V450, P866, DOI [10.1038/nature06355, 10.1038/nature06356]

[36] THE ELECTRICAL RESISTANCE OF BINARY METALLIC MIXTURES [J].

LANDAUER, R .

JOURNAL OF APPLIED PHYSICS, 1952, 23 (07) :779-784

[37] Lunar Cumulate Mantle Overturn: A Model Constrained by Ilmenite Rheology [J].

Li, Haoyuan ;

Zhang, Nan ;

Liang, Yan ;

Wu, Bingcheng ;

Dygert, Nicholas J. ;

Huang, Jinshui ;

Parmentier, E. M. .

JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, 2019, 124 (05) :1357-1378

[38] ELASTICITY OF ILMENITES [J].

LIEBERMANN, RC .

PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 1976, 12 (01) :P5-P10

[39]

Lin YH, 2017, NAT GEOSCI, V10, P14, DOI [10.1038/NGEO2845, 10.1038/ngeo2845]

[40]

Lindsley D.H., 1974, Geochim. Cosmochim. Atca, V1, P521

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