A likely geological record of deep tremor and slow slip events from a subducted continental broken formation
Abstract Fluids in subduction zones play a key role in controlling seismic activity, drastically affecting the rheology of rocks, triggering mineral reactions, and lowering the effective stress. Fluctuating pore pressure is one important parameter for the switch between brittle and ductile deformati...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2022-03-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-022-08489-2 |
| _version_ | 1818646801785290752 |
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| author | Francesco Giuntoli Giulio Viola |
| author_facet | Francesco Giuntoli Giulio Viola |
| author_sort | Francesco Giuntoli |
| collection | DOAJ |
| description | Abstract Fluids in subduction zones play a key role in controlling seismic activity, drastically affecting the rheology of rocks, triggering mineral reactions, and lowering the effective stress. Fluctuating pore pressure is one important parameter for the switch between brittle and ductile deformation, thus impacting seismogenesis. Episodic tremor and slow slip events (ETS) have been proposed as a common feature of the geophysical signature of subduction zones. Their geological record, however, remains scanty. Only the detailed and further characterization of exhumed fossil geological settings can help fill this knowledge gap. Here we propose that fluctuating pore pressure linked to metamorphic dehydration reactions steered cyclic and ETS-related brittle and ductile deformation of continental crustal rocks in the subduction channel of the Apennines. Dilational shear veins and ductile mylonitic shear zones formed broadly coevally at minimum 1 GPa and 350 °C, corresponding to ~ 30–40 km depth in the subduction zone. We identify carpholite in Ca-poor metasediments as an important carrier of H2O to depths > 40 km in cold subduction zones. Our results suggest that the described (micro)structures and mineralogical changes can be ascribed to deep ETS and provide a useful reference for the interpretation of similar tectonic settings worldwide. |
| first_indexed | 2024-12-17T00:52:25Z |
| format | Article |
| id | doaj.art-94531c59d8e44179bb15bd67e501057d |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-12-17T00:52:25Z |
| publishDate | 2022-03-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-94531c59d8e44179bb15bd67e501057d2022-12-21T22:09:44ZengNature PortfolioScientific Reports2045-23222022-03-0112111410.1038/s41598-022-08489-2A likely geological record of deep tremor and slow slip events from a subducted continental broken formationFrancesco Giuntoli0Giulio Viola1Department of Biological, Geological and Environmental Sciences, Università degli Studi di BolognaDepartment of Biological, Geological and Environmental Sciences, Università degli Studi di BolognaAbstract Fluids in subduction zones play a key role in controlling seismic activity, drastically affecting the rheology of rocks, triggering mineral reactions, and lowering the effective stress. Fluctuating pore pressure is one important parameter for the switch between brittle and ductile deformation, thus impacting seismogenesis. Episodic tremor and slow slip events (ETS) have been proposed as a common feature of the geophysical signature of subduction zones. Their geological record, however, remains scanty. Only the detailed and further characterization of exhumed fossil geological settings can help fill this knowledge gap. Here we propose that fluctuating pore pressure linked to metamorphic dehydration reactions steered cyclic and ETS-related brittle and ductile deformation of continental crustal rocks in the subduction channel of the Apennines. Dilational shear veins and ductile mylonitic shear zones formed broadly coevally at minimum 1 GPa and 350 °C, corresponding to ~ 30–40 km depth in the subduction zone. We identify carpholite in Ca-poor metasediments as an important carrier of H2O to depths > 40 km in cold subduction zones. Our results suggest that the described (micro)structures and mineralogical changes can be ascribed to deep ETS and provide a useful reference for the interpretation of similar tectonic settings worldwide.https://doi.org/10.1038/s41598-022-08489-2 |
| spellingShingle | Francesco Giuntoli Giulio Viola A likely geological record of deep tremor and slow slip events from a subducted continental broken formation Scientific Reports |
| title | A likely geological record of deep tremor and slow slip events from a subducted continental broken formation |
| title_full | A likely geological record of deep tremor and slow slip events from a subducted continental broken formation |
| title_fullStr | A likely geological record of deep tremor and slow slip events from a subducted continental broken formation |
| title_full_unstemmed | A likely geological record of deep tremor and slow slip events from a subducted continental broken formation |
| title_short | A likely geological record of deep tremor and slow slip events from a subducted continental broken formation |
| title_sort | likely geological record of deep tremor and slow slip events from a subducted continental broken formation |
| url | https://doi.org/10.1038/s41598-022-08489-2 |
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