Water in the mantle
Water in the mantle
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DOI：
10.2113/gselements.1.1.25
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发表时间：
2005
期刊：
影响因子：
4.5
通讯作者：
E. Ohtani
中科院分区：
文献类型：
--
作者：
E. Ohtani
俯冲板块将储存在含水矿物中的水输送到过渡带和下地幔中。上地幔和下地幔的储水量均小于0.2 wt%。由于作为过渡区主要成分的硅锰矿和尖角橄榄石的水溶解度为约1-3重量％，过渡区具有约0.5-1重量％的存储容量。因此，过渡带可能是地球内部的一个主要水库。最近的地球物理观测表明俯冲带下方存在水合过渡带。通过与下地幔中的金属铁反应形成水相或氢化铁，水或氢可以被输送至下地幔底部。
Subducting slabs transport water stored in hydrous minerals into the transition zone and lower mantle. The water storage capacity of the upper and lower mantles is less than 0.2 wt%. The transition zone has a storage capacity of approximately 0.5-1 wt% due to a water solubility of about 1-3 wt% in wadsleyite and ringwoodite, which are the major constituents of the transition zone. Thus, the transition zone may be a major water reservoir in the Earth9s interior. Recent geophysical observations suggest the existence of the hydrated transition zone beneath subduction zones. Water or hydrogen may be transported as far as the bottom of the lower mantle by reacting with metallic iron in the lower mantle to form hydrous phases or iron hydride.