title: Water in Earth's lower mantle.
abstract: Secondary ion mass spectrometry measurements show that Earth's representative lower mantle minerals synthesized in a natural peridotitic composition can dissolve considerable amounts of hydrogen. Both MgSiO3-rich perovskite and magnesiowüstite contain about 0.2 weight percent (wt%) H2O, and CaSiO3-rich perovskite contains about 0.4 wt% H2O. The OH absorption bands in Mg-perovskite and magnesiowüstite were also confirmed with the use of infrared microspectroscopic measurements. Earth's lower mantle may store about five times more H2O than the oceans.
authors.affiliation: Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan. mmurakam@geo.titech.ac.jp
authors.forename: Motohiko
authors.initials: M
authors.lastname: Murakami
authors.forename: Kei
authors.initials: K
authors.lastname: Hirose
authors.forename: Hisayoshi
authors.initials: H
authors.lastname: Yurimoto
authors.forename: Satoru
authors.initials: S
authors.lastname: Nakashima
authors.forename: Naoto
authors.initials: N
authors.lastname: Takafuji