Stability of magnesite and its high-pressure form in the lowermost mantle

Maiko Isshiki (), Tetsuo Irifune (), Kei Hirose, Shigeaki Ono, Yasuo Ohishi, Tetsu Watanuki, Eiji Nishibori, Masaki Takata and Makoto Sakata
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Maiko Isshiki: Geodynamics Research Center, Ehime University
Tetsuo Irifune: Geodynamics Research Center, Ehime University
Kei Hirose: Tokyo Institute of Technology
Shigeaki Ono: IFREE, Japan Marine Science & Technology Center
Yasuo Ohishi: SPring-8/Japan Synchrotron Radiation Research Institute
Tetsu Watanuki: SPring-8/Japan Atomic Energy Research Institute
Eiji Nishibori: Nagoya University, Furo-cho
Masaki Takata: SPring-8/Japan Synchrotron Radiation Research Institute
Makoto Sakata: Nagoya University, Furo-cho

Nature, 2004, vol. 427, issue 6969, 60-63

Abstract: Abstract Carbonates are important constituents of marine sediments and play a fundamental role in the recycling of carbon into the Earth's deep interior via subduction of oceanic crust and sediments1,2,3. Study of the stability of carbonates under high pressure and temperature is thus important for modelling the carbon budget in the entire Earth system. Such studies, however, have rarely been performed under appropriate lower-mantle conditions and no experimental data exist at pressures greater than 80 GPa (refs 3–6). Here we report an in situ X-ray diffraction study of the stability of magnesite (MgCO3), which is the major component of subducted carbonates, at pressure and temperature conditions approaching those of the core–mantle boundary. We found that magnesite transforms to an unknown form at pressures above ∼115 GPa and temperatures of 2,100–2,200 K (depths of ∼2,600 km) without any dissociation, suggesting that magnesite and its high-pressure form may be the major hosts for carbon throughout most parts of the Earth's lower mantle.

Date: 2004
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DOI: 10.1038/nature02181

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