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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 >Concurrent evolution of ~3He/~4He ratio in the Earth's mantle reservoirs for the first 2 Ga
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Concurrent evolution of ~3He/~4He ratio in the Earth's mantle reservoirs for the first 2 Ga

机译：前2 Ga在地幔储层中〜3He /〜4He比的同时演化

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摘要

The differences in ~3He/~4He ratios between mid-oceanic ridge basalts (MORBs) and ocean island basalts (OIBs) require the existence of at least two distinct mantle reservoirs that have been preserved over long periods of the Earth's history. However, it is unclear how the ~3He/~4He ratios have evolved in the mantle over time, and when these reservoirs acquired their present-day signatures. Here we report the results of our model calculation for helium evolution in the mantle, and show that, from the time of the Earth's formation to the Late Archean (～2 Ga), the ~3He/~4He ratios in both the MORB and OIB mantle reservoirs evolved in a rather homogeneous fashion. In contrast to previous models, our model suggests that the distinction in ~3He/~4He ratios between the MORB-type source and the plume-type source is a relatively recent characteristic of the Earth's mantle.
机译：大洋中脊玄武岩（MORB）和大洋洲玄武岩（OIBs）之间〜3He /〜4He比值的差异要求至少存在两个独特的地幔储层，这些储层在地球历史的长时期内一直得到保存。但是，尚不清楚地幔中〜3He /〜4He的比率如何随时间变化，以及这些储层何时获得了当今的特征。在这里，我们报告了模型中地幔氦演化的计算结果，结果表明，从地球形成到太古宙晚期（〜2 Ga），MORB和OIB的〜3He /〜4He比地幔储层以相当均匀的方式演化。与以前的模型相比，我们的模型表明MORB型源和羽状源之间〜3He /〜4He比的区别是地球地幔的一个相对较新的特征。

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