Density of high-Ti basalt magma at high pressure and origin of heterogeneities in the lunar mantle

Tatsuya Sakamaki; Eiji Ohtani; Satoru Urakawa; Akio Suzuki; Yoshinori Katayama; Dapeng Zhao

doi:10.1016/j.epsl.2010.09.007

Density of high-Ti basalt magma at high pressure and origin of heterogeneities in the lunar mantle

Tatsuya Sakamaki, Eiji Ohtani, Satoru Urakawa, Akio Suzuki, Yoshinori Katayama, Dapeng Zhao

Research output: Contribution to journal › Article › peer-review

34 Citations (Scopus)

Abstract

The density of the Apollo 14 black glass melt, which has the highest TiO₂ content of pristine mare glasses, was measured to 4.8GPa and 2100K using an X-ray absorption method. A fit of the pressure-density-temperature data to the high-temperature Birch-Murnaghan equation of state yielded the isothermal bulk modulus K_T0=9.0±1.2GPa, its pressure derivative K₀'=16.0±3.4, and the temperature derivative of the bulk modulus (∂K_T/∂T)_P=-0.0030±0.0008GPa/K at 1700K. The high-Ti basalt magma is less dense than the lunar mantle below about 1.0GPa. Therefore, the high-Ti basalt magma produced in the hybridized source (100-200km) can ascend to the lunar surface. The basalt formed at the higher pressure could not ascend but move downwards, and solidify in the lunar mantle. The solidified high-Ti basalt components can create chemical heterogeneities in the lunar mantle and can cause the low-velocity anomalies observed seismologically.

Original language	English
Pages (from-to)	285-289
Number of pages	5
Journal	Earth and Planetary Science Letters
Volume	299
Issue number	3-4
DOIs	https://doi.org/10.1016/j.epsl.2010.09.007
Publication status	Published - 2010 Nov 1

Keywords

Density
Equation of state
High pressure
High-Ti basalt
X-ray absorption method

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10.1016/j.epsl.2010.09.007

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@article{007b6fab4c8b4f49869a7729784727d3,

title = "Density of high-Ti basalt magma at high pressure and origin of heterogeneities in the lunar mantle",

abstract = "The density of the Apollo 14 black glass melt, which has the highest TiO2 content of pristine mare glasses, was measured to 4.8GPa and 2100K using an X-ray absorption method. A fit of the pressure-density-temperature data to the high-temperature Birch-Murnaghan equation of state yielded the isothermal bulk modulus KT0=9.0±1.2GPa, its pressure derivative K0'=16.0±3.4, and the temperature derivative of the bulk modulus (∂KT/∂T)P=-0.0030±0.0008GPa/K at 1700K. The high-Ti basalt magma is less dense than the lunar mantle below about 1.0GPa. Therefore, the high-Ti basalt magma produced in the hybridized source (100-200km) can ascend to the lunar surface. The basalt formed at the higher pressure could not ascend but move downwards, and solidify in the lunar mantle. The solidified high-Ti basalt components can create chemical heterogeneities in the lunar mantle and can cause the low-velocity anomalies observed seismologically.",

keywords = "Density, Equation of state, High pressure, High-Ti basalt, X-ray absorption method",

author = "Tatsuya Sakamaki and Eiji Ohtani and Satoru Urakawa and Akio Suzuki and Yoshinori Katayama and Dapeng Zhao",

note = "Funding Information: We thank H. Terasaki and T. Sakai of Tohoku University for useful discussions on the manuscript. This work was supported by a Grant-in-Aid for Scientific Research to EO (no. 16340164 ) and SU ( 13440163 , 16340170 and 20103003 ) from the Ministry of Education, Culture, Sports, Science, and Technology of the Japanese Government . This work was also partially supported by the Global Center of Excellence program of Earth and Planetary Science, Tohoku University, Japan . TS was supported by a Research Fellowship of the Japan Society for the Promotion of Science for Young Scientists . The synchrotron radiation experiments were performed at the BL22XU line of the Japan Atomic Energy Agency (JAEA) SPring-8 facility under the Common-Use Facility Program of JAEA (proposal no. 2009B-E13).",

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doi = "10.1016/j.epsl.2010.09.007",

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journal = "Earth and Planetary Science Letters",

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T1 - Density of high-Ti basalt magma at high pressure and origin of heterogeneities in the lunar mantle

AU - Sakamaki, Tatsuya

AU - Ohtani, Eiji

AU - Urakawa, Satoru

AU - Suzuki, Akio

AU - Katayama, Yoshinori

AU - Zhao, Dapeng

N1 - Funding Information: We thank H. Terasaki and T. Sakai of Tohoku University for useful discussions on the manuscript. This work was supported by a Grant-in-Aid for Scientific Research to EO (no. 16340164 ) and SU ( 13440163 , 16340170 and 20103003 ) from the Ministry of Education, Culture, Sports, Science, and Technology of the Japanese Government . This work was also partially supported by the Global Center of Excellence program of Earth and Planetary Science, Tohoku University, Japan . TS was supported by a Research Fellowship of the Japan Society for the Promotion of Science for Young Scientists . The synchrotron radiation experiments were performed at the BL22XU line of the Japan Atomic Energy Agency (JAEA) SPring-8 facility under the Common-Use Facility Program of JAEA (proposal no. 2009B-E13).

PY - 2010/11/1

Y1 - 2010/11/1

N2 - The density of the Apollo 14 black glass melt, which has the highest TiO2 content of pristine mare glasses, was measured to 4.8GPa and 2100K using an X-ray absorption method. A fit of the pressure-density-temperature data to the high-temperature Birch-Murnaghan equation of state yielded the isothermal bulk modulus KT0=9.0±1.2GPa, its pressure derivative K0'=16.0±3.4, and the temperature derivative of the bulk modulus (∂KT/∂T)P=-0.0030±0.0008GPa/K at 1700K. The high-Ti basalt magma is less dense than the lunar mantle below about 1.0GPa. Therefore, the high-Ti basalt magma produced in the hybridized source (100-200km) can ascend to the lunar surface. The basalt formed at the higher pressure could not ascend but move downwards, and solidify in the lunar mantle. The solidified high-Ti basalt components can create chemical heterogeneities in the lunar mantle and can cause the low-velocity anomalies observed seismologically.

AB - The density of the Apollo 14 black glass melt, which has the highest TiO2 content of pristine mare glasses, was measured to 4.8GPa and 2100K using an X-ray absorption method. A fit of the pressure-density-temperature data to the high-temperature Birch-Murnaghan equation of state yielded the isothermal bulk modulus KT0=9.0±1.2GPa, its pressure derivative K0'=16.0±3.4, and the temperature derivative of the bulk modulus (∂KT/∂T)P=-0.0030±0.0008GPa/K at 1700K. The high-Ti basalt magma is less dense than the lunar mantle below about 1.0GPa. Therefore, the high-Ti basalt magma produced in the hybridized source (100-200km) can ascend to the lunar surface. The basalt formed at the higher pressure could not ascend but move downwards, and solidify in the lunar mantle. The solidified high-Ti basalt components can create chemical heterogeneities in the lunar mantle and can cause the low-velocity anomalies observed seismologically.

KW - Density

KW - Equation of state

KW - High pressure

KW - High-Ti basalt

KW - X-ray absorption method

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VL - 299

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EP - 289

JO - Earth and Planetary Science Letters

JF - Earth and Planetary Science Letters

IS - 3-4

ER -

Density of high-Ti basalt magma at high pressure and origin of heterogeneities in the lunar mantle

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Keywords

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