Re-Os isochron age of Fankeng basalts from Fujian of SE China and its geological significance

Jincheng Zhou*, Shaoyong Jiang, Xiaolei Wang, Jinghong Yang, Mengqun Zhang

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    32 Citations (Scopus)

    Abstract

    Mesozoic basalts occur widely in SE China, with two major episodes of activity during the Middle Jurassic and Early Cretaceous. The exact age and mantle source character for the first eruption of basaltic magma during the Jurassic are not well constrained. In this paper we report, for the first time, Re-Os isotope data on these basalts. We sampled the Fankeng basalts in the Yongding basin of southwestern Fujian, SE China and separated the Fe-Ti oxide concentrates in them. Six samples of the Fe-Ti oxide concentrates yield a Re-Os isochron age of 175.4 ± 3.1 Ma with an initial 187Os/188Os ratio of 0.124 ± 0.014, corresponding to an initial γOs value of -1.44 at 175.4 Ma. The age suggests that the Fankeng basalts are products of Middle Jurassic magmatism. Both (187Os/188Os)i and γOs values are near chondritic. Together with Sm-Nd isotope data of these basalts, we conclude that the Fankeng basaltic magma might be derived from depleted asthenospheric mantle. The near chondritic γ Os and εNd(T) values may suggest interactions between asthenosphere and lithosphere during early Mesozoic in the area.

    Original languageEnglish
    Pages (from-to)497-502
    Number of pages6
    JournalGEOCHEMICAL JOURNAL
    Volume39
    Issue number6
    DOIs
    Publication statusPublished - 2005

    Keywords

    • Fankeng in Fujian of China
    • Interactions between asthenosphere and lithosphere
    • Middle Jurassic
    • Re-Os isochron age
    • Tholeiites

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