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    A Gravity Study of the Longmenshan Fault Zone: New Insights Into the Nature and Evolution of the Fault Zone and Extrusion-Style Growth of the Tibetan Plateau Since 40 Ma

    Access Status
    Fulltext not available
    Authors
    Jiang, X.
    Li, Zheng-Xiang
    Li, C.
    Gong, W.
    Date
    2019
    Type
    Journal Article
    
    Metadata
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    Citation
    Jiang, X. and Li, Z. and Li, C. and Gong, W. 2019. A Gravity Study of the Longmenshan Fault Zone: New Insights Into the Nature and Evolution of the Fault Zone and Extrusion-Style Growth of the Tibetan Plateau Since 40 Ma. Tectonics. 38 (1): pp. 176-189.
    Source Title
    Tectonics
    DOI
    10.1029/2018TC005272
    ISSN
    0278-7407
    School
    School of Earth and Planetary Sciences (EPS)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/FL150100133
    URI
    http://hdl.handle.net/20.500.11937/74528
    Collection
    • Curtin Research Publications
    Abstract

    The Longmenshan Fault Zone (LFZ) is a tectonic boundary between the Tibetan Plateau and the Sichuan Basin of the South China Block. Knowledge of the nature and history of the LFZ is important for understanding the growth of continental plateaus and mechanisms for major earthquakes along their margins, as exemplified by the magnitude 7.9 M Wenchuan earthquake of 12 May 2008. Flexural modeling of new and existing gravity survey data along three transects, combined with published seismic reflection profiles and earthquake focal mechanism data, indicates that the central-northern LFZ is a lithospheric-scale fault zone that has low elastic strength but with strong episodic dextral transpressional motions. In contrast, the southern LFZ is a crustal-scale thrust zone dominated by shallow-angle thrust motion of the Tibetan Plateau over a moderately stiff South China Block. In conjunction with the record of Cenozoic basin erosion in the western Sichuan Basin and a regional kinematic analysis, we suggest that the lithospheric-scale LFZ started 40 Myr ago and became an external boundary of a northeasterly directed extrusion-style plateau growth, predominantly through crustal thrusting and thickening.

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