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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >The core as a possible source of mantle helium
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The core as a possible source of mantle helium

机译：核心可能是地幔氦的来源

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The core has often been suggested as a source for He presently found in the mantle. If the core served as the long-term storage reservoir for He in ocean island basalts with distinctively high ~3He/~4He ratios, then the difficulties of maintaining an isolated mantle reservoir separate from the source of mid-ocean ridge basalts are removed. However, the possibilities of trapping He into the core and releasing it into the overlying mantle have not yet been systematically evaluated. Here some of the factors to be considered are discussed. Appealing to the core as a source of rare gases necessarily evokes specific conditions of terrestrial rare gas acquisition and core formation, as well as core composition characteristics. It is shown that even if partition coefficients between silicates (solid or melt) and liquid Fe are low, there may have been sufficient gas present in the mantle during core segregation to supply a substantial quantity of He and Ne to the core. Transfer from the core to the mantle by either bulk entrainment of core material or chemical interaction at the core-mantle boundary may provide a reasonable mechanism for supplying relatively unfractionated rare gases to plumes. However, this remains speculative. While this process may have considerable impact on other trace elements, further limits on the rate of such transfer are only possible once further constraints are available on the concentration of other elements in the outer core. There are presently insufficient date available to establish whether or not the core is a plausible source of mantle He with high ~3He/~4He ratios. Therefore, further systematic investigation of this possibility should be conducted.
机译：核心经常被认为是目前在地幔中发现他的来源。如果将岩心用作〜3He /〜4He比值很高的海洋岛玄武岩中He的长期储层，那么就消除了将孤立的地幔储层与中海脊玄武岩源分开的困难。但是，尚未系统地评估将He陷入岩心并将其释放到上覆地幔中的可能性。这里讨论了一些要考虑的因素。吸引岩心作为稀有气体的来源必然引起陆地稀有气体获取和岩心形成的特殊条件，以及岩心组成特征。结果表明，即使硅酸盐（固态或熔融态）和液态Fe之间的分配系数很低，在岩心离析过程中地幔中也可能有足够的气体向岩心供应大量的He和Ne。通过核心材料的整​​体夹带或在核心-地幔边界处的化学相互作用，从核心到地幔的转移可能为向羽状流供应相对未分离的稀有气体提供合理的机制。但是，这仍然是推测性的。尽管此过程可能会对其他痕量元素产生重大影响，但只有在对外部芯中其他元素的浓度有进一步限制的情况下，才可能进一步限制这种转移的速率。目前尚无足够的日期来确定岩心是否是高He ~~ 3He比率的地幔He的合理来源。因此，应对此可能性进行进一步的系统研究。

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