T018
Subduction Mélanges and their Implications for Convergent Margin Evolution and the Distribution of Slow Slip Events: Insights from Outcrop Data, Modeling, and Geophysics
Session ID#: 250060
Session Description:
Subduction mélanges are complex geological archives that record polycyclic deformation affected by mechanical mixing of materials from different lithospheric domains. The mélanges play a critical role in the mechanical, geochemical, and tectonic evolution of subduction zones, influencing fault behavior, fluid pathways, metamorphism, deformation, and seismic activity, including Slow Slip Events (SSE).This session aims to integrate contributions that explore the role of subduction mélanges at different scales, from field-based geological observations to laboratory experiments, geophysical studies, and numerical models. We welcome presentations that address: Structural, petrological, and geochemical evolution of subduction mélanges; Laboratory and numerical experiments assessing mélange influence on subduction zone dynamics, mechanics, and thermal budgets; Geophysical investigations linking mélange properties to the distribution of SSE and seismic hazards. By fostering a multidisciplinary discussion across disciplines, this session aims to highlight potential links between intrinsic geological characteristics of mélanges and the spatial-temporal distribution of seismic activity in convergent margins.
Co-Sponsor(s):
Index Terms:
0545 Modeling [COMPUTATIONAL GEOPHYSICS]
7230 Seismicity and tectonics [SEISMOLOGY]
8021 Melanges [STRUCTURAL GEOLOGY]
8170 Subduction zone processes [TECTONOPHYSICS]
Primary Convener: Manuel Roda, Università degli Studi di Milano, Department of Earth Science, Milano, Italy
Convener: John Wakabayashi, California State University Fresno, Earth and Environmental Sciences, Fresno, CA, United States
Comparing Experimental Flow Laws to the Rock Record: Sodic Amphibole Deformation in the Condrey Mountain Schist, Northern California (1890576)
Carolyn M Tewksbury-Christle, Fort Lewis College, Geosciences Department, Durango, CO, United States and Whitney Behr, Structural Geology and Tectonics Group, Geological Institute, Zürich, Switzerland
Strain Heterogeneity and Deformation Mechanisms Operating at the Seismogenic Plate Interface Revealed in the Exhumed Olympic Subduction Complex (1897045)
Anna Ledeczi1, Harold J Tobin1, Tsai-Wei Chen1, Bernard A Housen2, Cristina Garcia Lasanta3, Peter Lindquist1 and Sean R Mulcahy3, (1)University of Washington Seattle, Earth and Space Sciences, Seattle, WA, United States, (2)Western Washington University, Geology, Bellingham, WA, United States, (3)Western Washington University, Geology, Bellingham, United States
Seamount Subduction and Slow Earthquake Activity in the Guerrero Seismic Gap: Insights into Tsunami Earthquakes and Accretionary Wedge Properties (1903477)
Yoshihiro Ito, Disaster Prevention Research Institute, Kyoto University, Kyoto, Japan, Ketzallina Flores, Kyoto Universtity, Disaster Prevention Research Institute, Kyoto, Japan, Yanhan Chen, Kyoto University, Division of Earth and Planetary sciences, Kyoto, Japan and Abraham Hernández, Kyoto University, Graduate School of Science, Kyoto, Japan
Multi-Kilometer-Scale Fault Zone Heterogeneity in a Deep Subduction Analog for Slow Slip and Tremor (Invited) (1907887)
Whitney M Behr1, Dominic Hildebrandt2, Jesús Muñoz-Montecinos1 and Leif Tokle1, (1)Structural Geology & Tectonics Group, Dept. of Earth & Planetary Sciences, ETH Zürich, Zürich, Switzerland, (2)Structural Geology & Tectonics Group at ETH Zürich, and Department of Earth, Atmospheric & Planetary Sciences at MIT, Zürich, Switzerland and Cambridge, MA, United States
Multidisciplinary Approach to Investigate Tectonic Mélanges at the Alpine Subduction Interface (Western Alps) (1908665)
Chiara Benedetta Piloni1, Thomas Gusmeo2, Marco Filippi1, Gisella Rebay3, Manuel Roda4, Michele Zucali1 and Maria Iole Spalla5, (1)Università degli Studi di Milano, Milan, Italy, (2)Università di Bologna, Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Bologna, Italy, (3)Università di Pavia, Dipartimento di Scienze della Terra e dell'Ambiente, Pavia, Italy, (4)Università degli Studi di Milano, Earth Science, Milano, Italy, (5)Università degli Studi di Milano, Dipartimento di Scienze della Terra "A. Desio", Milano, Italy
Multiscale polygenetic mélange in the eclogitic Zermatt-Saas Zone ophiolite, Western Alps (1926067)
Davide Zanoni1, Thomas Gusmeo2, Gisella Rebay3 and Maria Iole Spalla1, (1)Università degli Studi di Milano, Dipartimento di Scienze della Terra "A. Desio", Milano, Italy, (2)Università di Bologna, Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Bologna, Italy, (3)Università di Pavia, Dipartimento di Scienze della Terra e dell'Ambiente, Pavia, Italy
