Widespread Archean basement beneath the Yangtze craton

Jianping Zheng*, W. L. Griffin, Suzanne Y. O'Reilly, Ming Zhang, Norman Pearson, Yuanming Pan

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    465 Citations (Scopus)

    Abstract

    The age distribution of the crust is a fundamental parameter in modeling continental evolution and the rate of crustal accretion through Earth's history, but this is usually estimated from surface exposures. The exposed Yangtze craton in eastern China consists mainly of Proterozoic rocks with rare Archean outcrops. However, the U-Pb ages and Hf isotope systematics of xenocrystic zircons brought to the surface in lamproite diatremes from three Proterozoic outcrop areas of the craton suggest the widespread presence of unexposed Archean basement, with zircon age populations of 2900-2800 Ma and 2600-2500 Ma and Hf model ages of 2.6 to ca. 3.5 Ga or older. The zircons also record thermal events reworked on the craton ca. 2020 Ma (remelting of older crust) and 1000-850 Ma (addition of juvenile mantle material). The observation of deep crust significantly older than the upper crust will require revision of models for the rates of crustal generation through time.

    Original languageEnglish
    Pages (from-to)417-420
    Number of pages4
    JournalGeology
    Volume34
    Issue number6
    DOIs
    Publication statusPublished - Jun 2006

    Fingerprint Dive into the research topics of 'Widespread Archean basement beneath the Yangtze craton'. Together they form a unique fingerprint.

    Cite this