期刊
GEOPHYSICAL RESEARCH LETTERS
卷 49, 期 2, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2021GL096415
关键词
metamorphic dehydration; seismicity; pore-fluid pressure; Alpine Schist; phase equilibria
资金
- University of New England
- School of Geography, Environment and Earth Sciences
This study investigates the relationship between tectonic tremor, hydrofracturing, and fluid migration under the actively forming Southern Alps in New Zealand. It combines predictions from phase equilibria and mechanical modeling to analyze the links between these processes. The study finds that the production of water during metamorphism along active plate boundaries contributes to tectonic tremor.
The production of H2O during metamorphism along active plate boundaries is inferred to contribute to low-frequency tectonic tremor. This study combines predictions from phase equilibria and mechanical modeling of coincident volume changes to investigate links of tremor with hydrofracturing and fluid migration under the actively forming Southern Alps, New Zealand. The posited location of metamorphic fluid production correlates with published geophysical images of inferred permeability enhancement, fluid accumulation and potential fluid flow. As the hanging-wall rocks are translated toward the surface by motion along the Alpine Fault, they can undergo metamorphic reactions that involve positive volume changes. Production of metamorphic fluids leads to hydrofracturing and the development of tremor hypocenters in regions along, and above deep reflectors of the Alpine Fault. The capacity of metamorphic rocks to generate or consume fluid along portions of the pressure-temperature path exerts a fundamental control on the distribution of stresses in the crust.
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