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 journalArticle

26 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 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.

Original languageEnglish
Pages (from-to)285-289
Number of pages5
JournalEarth and Planetary Science Letters
Volume299
Issue number3-4
DOIs
Publication statusPublished - Nov 1 2010

Keywords

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

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

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