Reconstructing Ocean-Plate Stratigraphy (OPS) to Understand Accretionary Style and Mélange Fabric:Insights From the Bangong-Nujiang Suture (Tibet, China)

Zeng, Min, Zhang, Ruisi, Chen, Si, Liu, Xinyu, Li, Chenwei, Ettensohn, Frank R. and Bie, Lidong (2021) Reconstructing Ocean-Plate Stratigraphy (OPS) to Understand Accretionary Style and Mélange Fabric:Insights From the Bangong-Nujiang Suture (Tibet, China). Geophysical Research Letters, 48 (18). ISSN 0094-8276

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Abstract

Ocean-plate stratigraphy (OPS) refers to the lithostratigraphic column atop an ocean plate, which becomes scraped off during subduction and preserved in accretionary complex (AC). Herein, based on structural, stratigraphic, and geochronological studies of ACs from the Bangong-Nujiang suture, we demonstrate that OPS can facilitate interpreting structural and compositional heterogeneities in ACs. Carefully correlated OPSs reveal that, on the overall sediment-rich lower plate, different types of basement topography correspond to the accretion of distinct litho-structural assemblages. In particular, subduction of the major, high-relief Zhonggang seamount eroded the earlier margin and was subsequently accreted as coherent seamount slices. In contrast, subduction of the lower-relief, Gaize seamount halted frontal accretion of trailing sediments, which were dragged downward to the seismogenic depth and underplated as pervasive, shear-related broken formations. Such broken formations may fingerprint past lower-relief-seamount subduction in other fossil ACs.

Item Type: Article
Additional Information: Funding Information: This study was supported by the Chinese National Natural Science Foundation (No. 41102065 and 41872110) and Chengdu University of Technology (2020ZF11407). We thank the editor Lucy Flesch and three reviewers (Dr. David Buchs and two anonymous) for critical reviews and constructive comments. Publisher Copyright: © 2021. American Geophysical Union. All Rights Reserved.
Uncontrolled Keywords: accretionary complex,bangong-nujiang meso-tethys suture,melange fabric,ocean-plate stratigraphy,oceanic basement topography,trench fill,geophysics,earth and planetary sciences(all) ,/dk/atira/pure/subjectarea/asjc/1900/1908
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Depositing User: LivePure Connector
Date Deposited: 27 Apr 2022 11:30
Last Modified: 24 May 2022 14:55
URI: https://ueaeprints.uea.ac.uk/id/eprint/84810
DOI: 10.1029/2021GL094457

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