|
Silicate perovskite is the term given to (Mg,Fe)SiO3 (also known as bridgmanite〔(【引用サイトリンク】title=Bridgmanite )〕) and CaSiO3 (calcium silicate) when arranged in a perovskite structure. Silicate perovskites are mainly found in the lower part of Earth's mantle, between about . They are thought to form the main mineral phases, together with ferropericlase. Natural silicate perovskite was discovered in a heavily shocked meteorite. In 2014, the Commission on New Minerals, Nomenclature and Classification (CNMNC) of the International Mineralogical Association (IMA) approved the name bridgmanite for perovskite-structured (Mg,Fe)SiO3,〔 in honor of physicist Percy Bridgman, who won the Nobel Prize in Physics in 1946 for his high-pressure research.〔(Eos, Transactions American Geophysical Union, Volume 95, Issue 23, Article first published online: 10 June 2014 PDF )〕 ==Abundance== Silicate perovskite may form up to 93% of the lower mantle and the magnesium iron form is considered to be the most abundant mineral in the Earth, making up 38% of its volume.〔 Under the very high pressures of the lowermost mantle, below about 2700 km, the silicate perovskites are replaced by post-perovskite. The physical properties of silicate perovskites under lower mantle conditions, such as seismic velocity, are studied experimentally using laser-heated diamond anvil cells. Naturally occurring silicate perovskites cannot be studied as they are unstable at the Earth's surface.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「silicate perovskite」の詳細全文を読む スポンサード リンク
|