Curtin University Homepage
  • Library
  • Help
    • Admin

    espace - Curtin’s institutional repository

    JavaScript is disabled for your browser. Some features of this site may not work without it.
    View Item 
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item

    Integrated in situ U–Pb age and Hf–O analyses of zircon from Suixian Group in northern Yangtze: New insights into the Neoproterozoic low-δ18O magmas in the South China Block

    237480_237480.pdf (19.19Mb)
    Access Status
    Open access
    Authors
    Yang, Y.
    Wang, Xuan-Ce
    Li, Q.
    Li, X.
    Date
    2016
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Yang, Y. and Wang, X. and Li, Q. and Li, X. 2016. Integrated in situ U–Pb age and Hf–O analyses of zircon from Suixian Group in northern Yangtze: New insights into the Neoproterozoiclow-δ18O magmas in the South China Block. Precambrian Research. 273: pp. 151-164.
    Source Title
    Precambrian Research
    DOI
    10.1016/j.precamres.2015.12.008
    ISSN
    0301-9268
    School
    Department of Applied Geology
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/FT140100826
    URI
    http://hdl.handle.net/20.500.11937/27104
    Collection
    • Curtin Research Publications
    Abstract

    The mid- to late-Neoproterozoic magmatic rocks from the northern margin of the Yangtze Block are major protoliths of high-pressure (HP) and ultrahigh-pressure (UHP) metamorphic rocks in the Dabie–Sulu orogenic belt along the northern margin of the South China Block. Oxygen isotopic compositions of these mid- to late-Neoproterozoic magmatic rocks hold a key to understanding the origin of large-scale 18O-depletion in the HP and UHP metamorphic rocks. We report here the integrated in situ U–Pb dating and Hf–O isotope analyses of zircon grains from sedimentary and volcanic rocks in the Neoproterozoic Suixian Group along the northern margin of the Yangtze Block, South China. This study shows that the Suixian Group was deposited at 740–720 Ma, corresponding to late stage of the second deposition cycle (820–720 Ma) of the Neoproterozoic deposition in the Yangtze Block. Detrital zircon grains from the Suixian Group display age peaks at 0.73–0.74 Ga, 0.79 Ga, and 2.0 Ga. Zircon U–Pb ages together with Hf–O isotopic compositions indicate provenance of the Suixian Group dominantly from the proximal Neoproterozoic igneous rocks with possible contribution from Paleoproterozoic rocks along the northern margin of the South China Block. Zircon δ18O values from the Suixian Group have a large range from 10.5‰ to 1.3‰.Zircon grains with negative δ18O values, typical index of magma-meteoric water interaction, were not identified in this study. The major phase of low-δ18O magmas (δ18Ozircon < 4.6‰) initiated at ca. 800 Ma, long before the first glaciation event arising at about 716 Ma in the South China Block, and lasted for over 100 m.y. The ɛHf(t) values of the low-δ18O zircon grains from the Suixian Group range between −15.5 and 10.7. About 74 percent of low-δ18O zircon grains have negative ɛHf(t) values varying from −15.5 to 0. This strongly argues against the possibility that the low-δ18O magma was generated dominantly by partial melting of high-T hydrothermally altered oceanic lower crust. This study emphasizes that high-T water-rock interaction and continental rifting tectonic setting are essential to produce the abundant low-δ18O magmas, and confirms that most of negative δ18O signature identified in zircon grains from HP and UHP metamorphic rocks may not have been inherited from their Neoproterozoic protoliths.

    Related items

    Showing items related by title, author, creator and subject.

    • Mid-Neoproterozoic angular unconformity in the Yangtze Block revisited: Insights from detrital zircon U-Pb age and Hf-O isotopes
      Yang, C.; Li, X.; Wang, Xuan-Ce; Lan, Z. (2015)
      Middle Neoproterozoic sedimentary rocks are widespread in the South China Block, especially around the periphery of the Yangtze Block. They are separated into the Sibao and Danzhou groups (and their equivalents) by a ...
    • Origin of the Tongbai-Dabie-Sulu Neoproterozoic low-δ18O igneous province, east-central China
      Fu, B.; Kita, N.; Wilde, Simon; Liu, X.; Cliff, J.; Greig, A. (2013)
      Zircons from 71 diverse rocks from the Qinling-Tongbai-Dabie-Sulu orogenic belt in east-central China and, for comparison, eight from adjoining areas in the South China and North China blocks, have been analyzed for in ...
    • Nonglacial origin for low-δ18O Neoproterozoic magmas in the South China Block: Evidence from new in-situ oxygen isotope analyses using SIMS
      Wang, Xuan-Ce; Li, Zheng-Xiang; Li, X.; Li, Q.; Tang, G.; Zhang, Q.; Liu, Y. (2011)
      Low-δ18O signatures in supracrustal rocks have been used as geochemical proxies for cold paleoclimates, e.g., glaciations. Unusual low-δ18O values found in Neoproterozoic igneous rocks in parts of the South China Block ...
    Advanced search

    Browse

    Communities & CollectionsIssue DateAuthorTitleSubjectDocument TypeThis CollectionIssue DateAuthorTitleSubjectDocument Type

    My Account

    Admin

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Follow Curtin

    • 
    • 
    • 
    • 
    • 

    CRICOS Provider Code: 00301JABN: 99 143 842 569TEQSA: PRV12158

    Copyright | Disclaimer | Privacy statement | Accessibility

    Curtin would like to pay respect to the Aboriginal and Torres Strait Islander members of our community by acknowledging the traditional owners of the land on which the Perth campus is located, the Whadjuk people of the Nyungar Nation; and on our Kalgoorlie campus, the Wongutha people of the North-Eastern Goldfields.