Abstract

One of the Major Advances in Mineral Physics and Seismology is the Realization that Different Olivine Fabric Types Are Functions of Temperature, Shear Stress, and Water Content in Oceanic Subducting Systems. the Distribution of Different Olivine Fabric Types and Geodynamic Processes in the Mantle Wedge above a Subducting Continental Slab Remain Poorly Understood. Here, based on Splitting Analysis of Shear Waves Recorded by 46 Stations Recently Deployed in Central Myanmar, We Reveal Trench-Perpendicular Fast Orientations between the 80 and 100 Km Slab Contours Sandwiched between Trench-Parallel Fast Orientations from the Mantle Wedge Tip to the Backarc. the Dramatic Change in Fast Orientations Indicates the Transition of Olivine Fabric Types in the Mantle Wedge Combined with Corner Flow. Cold Continental Sub-Duction and Shear Stress Reduction Caused by Partial Melting Favor B-Type and C- or E-Type Olivine Fabrics, Respectively.

Department(s)

Geosciences and Geological and Petroleum Engineering

Publication Status

Open Access

Comments

National Natural Science Foundation of China, Grant 42030309,42130308

International Standard Serial Number (ISSN)

1943-2682; 0091-7613

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Geological Society of America, All rights reserved.

Publication Date

01 Jan 2024

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