首页|Geophysical evidence of large-scale silica-rich fluid flow above the continental subduction interface

Geophysical evidence of large-scale silica-rich fluid flow above the continental subduction interface

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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.

Western AlpsCrustal structureReceiver functionVP/VS ratioSilica enrichment

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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State Key Laboratory of Lithospheric and Environmental Coevolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China

College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China

Department of Earth and Environmental Sciences,University of Milano-Bicocca,Milan 20126,Italy

Istituto Nazionale di Geofisica e Vulcanologia,Osservatorio Nazionale Terremoti,Genova 16145,Italy

Istituto Nazionale di Geofisica e Vulcanologia,Sezione di Bologna,Bologna 40127,Italy

Université Grenoble Alpes,Université Savoie Mont Blanc,CNRS,IRD,UGE,ISTerre,Grenoble 38000,France

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Western Alps Crustal structure Receiver function VP/VS ratio Silica enrichment

2024

10.1007/s11430-023-1334-2

中国科学:地球科学(英文版)
中国科学院

中国科学:地球科学(英文版)

影响因子：1.002
ISSN：1674-7313
年,卷(期)：2024.67(9)