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科学家获得地球元素组成迄今最全面估算结果

2017-09-22 15:07:04   新华网

新华社堪培拉9月22日电(记者徐海静 赵博)由于深度钻探技术发展所限,人类对地球元素组成的研究很大程度上仍依靠推测和估算。在一项最新研究中,澳大利亚科学家对此前相关研究成果进行了全面分析,对地球元素组成做出了迄今最全面的估算,这将有助于更好地理解地球在46亿年前是如何形成的。

这项研究的第一作者、澳大利亚国立大学天文与天体物理学院博士研究生王海洋日前接受新华社采访时说,团队通过整合分析过去基于岩石测量、宇宙化学、大地地震测量以及高温高压实验等分散的地幔和地核化学成分研究结果,以及新估算的地核质量及误差,对83种天然地球元素的丰度及误差进行了较为准确的估算,获得了关于地球整体元素组分迄今最全面的估算结果。

根据研究小组最新的地球总体组分模型,地球中钠、钾、氯等14种元素比过去认为的更富集,而镁、锡、溴、硼、镉5种元素比过去认为的要少。

澳大利亚国立大学地球科学学院及天文与天体物理学院联合研究员查里·莱恩威弗告诉记者,在地球形成之初,其元素组分就已基本确定,成分最多的4种元素铁、氧、镁、硅占地球总质量90%以上,然而精确确定地球的元素组分却没有想象中那么容易。

“我们的研究结果不仅对太阳系研究具有深远影响,对其他类地行星系统(研究)也有重要参考价值,”莱恩威弗说。

相关论文将发表在美国《国际太阳系研究杂志》上。

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