近日，美国北亚利桑那大学Mary R. Reid团队报道了构造对分布火山场下岩浆储存的控制。2026年1月28日出版的《地质学》杂志发表了这项成果。

分布火山场在全球范围内存在，但控制火山组成和行为的过程仍然不确定。

为了研究火山喷发方式、熔体储存的控制因素，以及在一个体积巨大的岩浆、中间熔岩和/或硅熔岩系统中的危害，研究组对美国亚利桑那州北部旧金山火山场的地下进行了地震成像。研究结果表明，熔体有两个部分熔体区，并伴有局部熔体厚度的变化，这与较低的熔体去除有关。

旧金山脉是一座长英质层状火山，位于完整的火山口和被移除的火山口之间的边界上。这一岩石圈性质的横向边界集中熔体形成中、下部储层，使该玄武岩为主的地区形成了长英质火山作用。这证明了横向岩石圈梯度是如何在分布的火山场集中融化的，而移除在产生这些梯度中起着关键作用。

附：英文原文

Title: Tectonic controls on magma storage beneath a distributed volcanic field

Author: anonymous

Issue&Volume: 2026-01-28

Abstract: Distributed volcanic fields occur globally, but the processes that control volcanic composition and behavior remain uncertain. To investigate the controls on eruptive style, melt storage, and hazards in a system with voluminous mafic and intermediate and/or silicic lavas, we seismically imaged the subsurface beneath the San Francisco volcanic field in northern Arizona (USA). Results reveal two partial melt zones and regional changes in crustal thickness, related to lower crustal removal. San Francisco Mountain, a felsic stratovolcano, is located atop a boundary between intact and removed crust. This lateral boundary in lithospheric properties concentrates melt into mid- and lower-crustal reservoirs, enabling felsic volcanism in this dominantly basaltic field. This demonstrates how lateral lithospheric gradients focus melt in distributed volcanic fields, with removal playing a key role in creating these gradients.

DOI: 10.1130/G54058.1

Source: https://pubs.geoscienceworld.org/gsa/geology/article/doi/10.1130/G54058.1/725322/Tectonic-controls-on-magma-storage-beneath-a