Global influence of mantle temperature and plate thickness on intraplate volcanism.
Global influence of mantle temperature and plate thickness on intraplate volcanism.
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DOI：
10.1038/s41467-021-22323-9
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发表时间：
2021-04-06
影响因子：
16.6
通讯作者：
Stephenson SN
中科院分区：
文献类型：
--
作者：
Ball PW;White NJ;Maclennan J;Stephenson SN
岩石圈和软流圈地幔的热化学结构对地表地形和火山活动起主要控制作用。火山岩成分和地幔地震速度提供了这种构造的间接观测。在此，我们编制并分析了全球新近系—第四纪板内火山岩的分布和组成数据库。通过将该数据库与地震层析模型相结合，我们发现板内火山活动集中在上地幔剪切波速度缓慢和岩石圈薄（即<100 km）的地区。我们观察到125-175 km深度的横波速度与从火山岩成分推断的熔体分数呈负相关。此外，地球化学模拟得到的地幔温度和岩石圈厚度估计与层析模型转换成温度的结果基本一致。板块内火山活动通常发生在隆起（但未变形）的海相沉积岩暴露的地区。这些岩石的区域抬升可能是软流圈变热和岩石圈变薄共同作用的结果。因此，板内火山岩在地质年代的分布和组成将有助于探测过去的地幔条件和地表过程。在此基础上，建立了全球新近系—第四纪板内火山作用地球化学数据库。通过将这些岩石的分布和组成与层析模型进行比较，他们表明，在喷发时，板内火山作用可以用来约束上地幔结构。
The thermochemical structure of lithospheric and asthenospheric mantle exert primary controls on surface topography and volcanic activity. Volcanic rock compositions and mantle seismic velocities provide indirect observations of this structure. Here, we compile and analyze a global database of the distribution and composition of Neogene-Quaternary intraplate volcanic rocks. By integrating this database with seismic tomographic models, we show that intraplate volcanism is concentrated in regions characterized by slow upper mantle shear-wave velocities and by thin lithosphere (i.e. <100 km). We observe a negative correlation between shear-wave velocities at depths of 125–175 km and melt fractions inferred from volcanic rock compositions. Furthermore, mantle temperature and lithospheric thickness estimates obtained by geochemical modeling broadly agree with values determined from tomographic models that have been converted into temperature. Intraplate volcanism often occurs in regions where uplifted (but undeformed) marine sedimentary rocks are exposed. Regional elevation of these rocks can be generated by a combination of hotter asthenosphere and lithospheric thinning. Therefore, the distribution and composition of intraplate volcanic rocks through geologic time will help to probe past mantle conditions and surface processes. Here, the authors compile a global geochemical database of Neogene-Quaternary intraplate volcanism. By comparing the distribution and composition of these rocks with tomographic models they show that intraplate volcanism can be used to constrain upper-mantle structure at the time of eruption.
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影响因子：
13.6
作者：
Austermann J;Mitrovica JX;Huybers P;Rovere A
通讯作者：
Rovere A
影响因子：
56.9
作者：
French, Scott;Lekic, Vedran;Romanowicz, Barbara
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Romanowicz, Barbara
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3.5
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Langmuir, CH
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2.3
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通讯作者：
Tibbetts, Ashley
影响因子：
3.9
作者：
Jain, Chhavi;Korenaga, Jun;Karato, Shun-ichiro
通讯作者：
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