arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1701.02550physics.geo-ph
收藏

俯冲带岩浆活动的热影响

Thermal impact of magmatism in subduction zones

David W. Rees Jones, Richard F. Katz, Meng Tian, John F. Rudge

摘要:

俯冲带的岩浆活动形成了陆壳,并导致了地球上大部分的陆上火山活动。岩浆的生产率和成分受俯冲带的热结构控制。一系列的地球化学和热流的证据最近已经汇聚到表明,俯冲带是更热的岩石圈深度在弧下比经典的热力学模型,忽略了岩浆作用的预测。我们表明,这种差异可以解决考虑的热量输送的岩浆。在我们的一维和二维的数值模型和标度分析,岩浆运输的显热和潜热局部改变的热结构的典型模型由$\sim$ 300 K,增加预测的表面热流和岩石圈中部的温度观测值。我们发现感热的平流大于潜热的沉降。基于这些结果,我们得出结论,热输运岩浆迁移影响的化学和弧火山的位置。

英文摘要:

Magmatism in subduction zones builds continental crust and causes most of Earth's subaerial volcanism. The production rate and composition of magmas are controlled by the thermal structure of subduction zones. A range of geochemical and heat flow evidence has recently converged to indicate that subduction zones are hotter at lithospheric depths beneath the arc than predicted by canonical thermomechanical models, which neglect magmatism. We show that this discrepancy can be resolved by consideration of the heat transported by magma. In our one- and two-dimensional numerical models and scaling analysis, magmatic transport of sensible and latent heat locally alters the thermal structure of canonical models by $\sim$300 K, increasing predicted surface heat flow and mid-lithospheric temperatures to observed values. We find the advection of sensible heat to be larger than the deposition of latent heat. Based on these results we conclude that thermal transport by magma migration affects the chemistry and the location of arc volcanoes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑