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Dry mantle transition zone inferred from the conductivity of wadsleyite and ringwoodite

机译：由沃兹利石和林伍德石的电导率推断出干燥的地幔过渡带

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摘要

The Earth's mantle transition zone could potentially store a large amount of water, as the minerals wadsleyite and ringwoodite incorporate a significant amount of water in their crystal structure. The water content in the transition zone can be estimated from the electrical conductivities of hydrous wadsleyite and ringwoodite, although such estimates depend on accurate knowledge of the two conduction mechanisms in these minerals (small polaron and proton conductions), which early studies have failed to distinguish between. Here we report the electrical conductivity of these two minerals obtained by high-pressure multi-anvil experiments. We found that the small polaron conductions of these minerals are substantially lower than previously estimated. The contributions of proton conduction are small at temperatures corresponding to the mantle transition zone and the conductivity of wadsleyite is considerably lower than that of ringwoodite for both mechanisms. The dry model mantle shows considerable conductivity jumps associated with the olivine-wadsleyite, wadsleyite-ringwoodite and post-spinel transitions. Such a dry model explains well the currently available conductivity-depth profiles5 obtained from geoelectromagnetic studies. We therefore conclude that there is no need to introduce a significant amount of water in the mantle transition to satisfy electrical conductivity constraints.
机译：地球的地幔过渡带可能会储存大量的水，因为矿物沃兹利石和林伍德石在其晶体结构中会包含大量的水。过渡带中的水含量可以从含水辉石和菱铁矿的电导率来估算，尽管这种估算取决于对这些矿物中的两种传导机理（小极化子和质子传导）的准确了解，而早期的研究却未能将其区分出来。之间。在这里，我们报告通过高压多砧实验获得的这两种矿物的电导率。我们发现这些矿物的小极化子传导率大大低于先前的估计。在对应于地幔过渡带的温度下，质子传导的贡献很小，并且对于两种机理而言，沃兹利石的电导率均显着低于林木的电导率。干燥的模型地幔显示出与橄榄石-辉石，辉石-白云母和尖晶石后转变有关的电导率跃变。这种干燥的模型很好地解释了从地电磁研究获得的当前可用的电导率-深度剖面5。因此，我们得出结论，不需要在地幔过渡层中引入大量的水来满足电导率约束。

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