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Earth's Heat

机译：地球的热量

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Linear chains of intraplate volcanoes and their geochemistry provide a record of mantle melting through geological time. The isotopic compositions of their lavas characterize their mantle sources, and their ages help backtrack these volcanoes to their original, eruptive source regions. Such data may shed light on a much-debated issue in Earth Sciences: the origin of intraplate volcanism and its underlying mantle and lithosphere dynamics. We show here that three major Western Pacific Seamount groups, ～50-100 million years in age, display distinct Sr, Nd, Hf, and Pb isotopic signatures that can be traced back in time, both geographically and geochemically, to three separate, recently-active intraplate volcanoes in the South Pacific Cook-Austral Islands. Their unique 100 million year history, which shows a persistent geochemical fingerprint, suggests formation from large volumes of laterally fixed, long-lived source regions. Such longevity is unlikely to be attained in the relatively dynamic upper mantle. Therefore, these sources are likely anchored deep in the mantle, isolated from homogenization by mantle convection, and imply a primary origin from deep mantle plumes rather than resulting from lithosphere extension.
机译：板内火山的线性链及其地球化学提供了贯穿地质时期地幔融化的记录。熔岩的同位素组成是其地幔源的特征，它们的年龄有助于将这些火山追溯到其原始的喷发源区。这些数据可能揭示了地球科学中一个备受争议的问题：板内火山活动的起源及其潜在的地幔和岩石圈动力学。我们在这里显示，年龄在50至1亿年之间的三个主要的西太平洋海山群显示出不同的Sr，Nd，Hf和Pb同位素特征，这些特征可以追溯到地理和地球化学的时间上，最近可以追溯到三个独立的太平洋库克-澳大利亚群岛的活跃板块内火山。它们独特的1亿年历史显示出持久的地球化学指纹，表明它由大量侧向固定的长寿命源区形成。在相对动态的上地幔中不可能获得这样的寿命。因此，这些来源很可能锚定在地幔深处，通过地幔对流与均质隔离，这暗示着地幔深处羽流的主要来源，而不是岩石圈扩展所致。

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