Hydrous oceanic crust hosts megathrust creep at low shear stresses
| Autor: | Kohtaro Ujiie, C. J. Tulley, Ake Fagereng |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Basalt
Multidisciplinary 010504 meteorology & atmospheric sciences SciAdv r-articles Geology 010502 geochemistry & geophysics 01 natural sciences Creep Rheology Shear (geology) Oceanic crust Viscous flow 14. Life underwater Shear zone Petrology Quartz Research Articles 0105 earth and related environmental sciences Research Article |
| Zdroj: | Science Advances |
| ISSN: | 2375-2548 |
| Popis: | Hydration allows subducting oceanic crust to be far weaker than previously recognized. The rheology of the metamorphosed oceanic crust may be a critical control on megathrust strength and deformation style. However, little is known about the strength and deformation style of metamorphosed basalt. Exhumed megathrust shear zones exposed on Kyushu, SW Japan, contain hydrous metabasalts deformed at temperatures between ~300° and ~500°C, spanning the inferred temperature-controlled seismic-aseismic transition. Field and microstructural observations of these shear zones, combined with quartz grain-size piezometry, indicate that metabasalts creep at shear stresses |
| Databáze: | OpenAIRE |
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