大陆俯冲界面上方大规模富硅流体流动的地球物理证据

IF 6 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Yuantong Mao, Liang Zhao, Marco G. Malusà, Stefano Solarino, Silvia Pondrelli, Baolu Sun, Coralie Aubert, Simone Salimbeni, Elena Eva, Stéphane Guillot
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引用次数: 0

摘要

俯冲带中的流体可对俯冲动力学产生重大影响。然而,关于大陆俯冲过程中流体流动的规模和影响的地球物理约束仍然有限。在这里,我们分析了西阿尔卑斯地区的VP/VS比值,该地区是世界上保存最完好的大陆俯冲化石带之一,我们通过分析该地区的VP/VS比值来研究大陆俯冲过程中流体流动的影响。我们在俯冲带的上板侧发现了一条VP/VS比值为1.9的高VP/VS比值带,这与部分蛇化的上板地幔相一致;而在下板侧则发现了一条VP/VS比值为1.7的异常低VP/VS比值带,其深度浅于30千米。我们认为,这些低VP/VS比值是由广泛分布的富含二氧化硅的矿脉网络造成的,表明过去曾有流体沿大陆俯冲界面流动。我们的研究结果表明,过去的流体流动可能降低了俯冲界面的有效应力,从而有利于大陆俯冲。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Geophysical evidence of large-scale silica-rich fluid flow above the continental subduction interface

Fluids in subduction zones can have major effects on subduction dynamics. However, geophysical constraints on the scale and impact of fluid flow during continental subduction are still limited. Here we analyze the VP/VS ratios in the Western Alpine region, hosting one of the best-preserved fossil continental subduction zones worldwide, to investigate the impact of fluid flow during continental subduction. We found a belt of high VP/VS ratios >1.9 on the upper-plate side of the subduction zone, consistent with a partially serpentinized upper-plate mantle, and a belt of unusually low VP/VS ratios <1.7 on the lower-plate side, at depths shallower than 30 km. We propose that these low VP/VS ratios result from a widespread network of silica-rich veins, indicating past fluid flow along the continental subduction interface. Our results suggest that past fluid flow may have reduced the effective stress along the subduction interface thus favoring continental subduction.

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来源期刊
Science China Earth Sciences
Science China Earth Sciences GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
9.60
自引率
5.30%
发文量
135
审稿时长
3-8 weeks
期刊介绍: Science China Earth Sciences, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research.
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