Semantic Scholar Open Access 2004 934 sitasi

Theoretical and experimental evidence for a post-perovskite phase of MgSiO3 in Earth's D″ layer

A. Oganov S. Ono

Lihat Sumber DOI

Abstrak

The Earth's lower mantle is believed to be composed mainly of (Mg,Fe)SiO3 perovskite, with lesser amounts of (Mg,Fe)O and CaSiO3 (ref. 1). But it has not been possible to explain many unusual properties of the lowermost ∼150 km of the mantle (the D″ layer) with this mineralogy. Here, using ab initio simulations and high-pressure experiments, we show that at pressures and temperatures of the D″ layer, MgSiO3 transforms from perovskite into a layered CaIrO3-type post-perovskite phase. The elastic properties of the post-perovskite phase and its stability field explain several observed puzzling properties of the D″ layer: its seismic anisotropy, the strongly undulating shear-wave discontinuity at its top and possibly the anticorrelation between shear and bulk sound velocities.

Topik & Kata Kunci

Geology Physics Materials Science Medicine

Penulis (2)

A. Oganov

S. Ono

Format Sitasi

APA MLA BibTeX

Oganov, A., Ono, S. (2004). Theoretical and experimental evidence for a post-perovskite phase of MgSiO3 in Earth's D″ layer. https://doi.org/10.1038/nature02701

Akses Cepat

Lihat di Sumber doi.org/10.1038/nature02701

Informasi Jurnal

Tahun Terbit: 2004
Bahasa: en
Total Sitasi: 934×
Sumber Database: Semantic Scholar
DOI: 10.1038/nature02701
Akses: Open Access ✓