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    Triassic sedimentation and postaccretionary crustal evolution along the Solonker suture zone in Inner Mongolia, China

    213242_141153_Simontect20144.pdf (8.972Mb)
    Access Status
    Open access
    Authors
    Li, S.
    Wilde, Simon
    He, Z.
    Jiang, X.
    Liu, R.
    Zhao, L.
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Li, S. and Wilde, S. and He, Z. and Jiang, X. and Liu, R. and Zhao, L. 2014. Triassic sedimentation and postaccretionary crustal evolution along the Solonker suture zone in Inner Mongolia, China. Tectonics. 33: pp. 960-981.
    Source Title
    Tectonics
    DOI
    10.1002/2013TC003444
    ISSN
    0278-7407
    School
    Department of Applied Geology
    Remarks

    Copyright © 2014 American Geophysical Union. All Rights Reserved

    URI
    http://hdl.handle.net/20.500.11937/18361
    Collection
    • Curtin Research Publications
    Abstract

    Detrital zircon U-Pb dating of the Xingfuzhilu Formation in southern Inner Mongolia yields a maximum depositional age of around 220 Ma. The predominantly Permian and Triassic zircons are characterized by oscillatory zoning and euhedral shapes, with mostly positive zircon εHf(t) values (+2.0 to +16.4), indicating that they were derived from a proximal magmatic source. Early-Middle Paleozoic zircons have variable zircon εHf(t) values from −6.2 to +11.2 and are characterized by weak oscillatory zoning and subhedral-subrounded shapes, suggesting that the sources are a proximal magmatic arc, possibly mixed with components of the Ondor Sum magmatic arc and the magmatic arc at the northern margin of the North China Craton. The remnants of Precambrian blocks in the southeastern Central Asian Orogenic Belt (CAOB), and the North China Craton may also have been a minor source region for the Xingfuzhilu succession. These results, combined with regional data, indicate that a closing remnant ocean basin or narrow seaway possibly existed in the Middle Permian (Guadalupian) immediately prior to final collision of the CAOB and closure of the Paleo-Asian Ocean. Subsequent collision resulted in the crustal uplift and thickening along the Solonker suture zone, accompanied by possible slab break-off and lithospheric delamination during the Latest Permian to Middle Triassic. The resultant orogen in the Late Triassic underwent exhumation and denudation of rocks in response to the postorogenic collapse and regional extension. Vertical crustal growth in the Triassic is documented by detrital zircons from the Xingfuzhilu Formation and appears to have been widespread across entire eastern CAOB.

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