Study on lithogeochemistry of Middle Jurassic basalts from Southern China represented by the Fankeng basalts from Yongding of Fujian Province

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

*Corresponding author for this work

    Research output: Contribution to journalArticle

    22 Citations (Scopus)

    Abstract

    There exists an E-W trending Middle Jurassic volcanic zone in southern China. The Fankeng basalts in the Yongding basin of Fujian Province are considered to be a typical example. The Fankeng basalts have TiO2 contents in the range of 1.92% - 3.21%. They are classified as high-Ti basalts. They also have higher total Fe (averaging FeOz.ast; = 11.09%). The Middle Jurassic Fankeng basalts from southwestern Fujian have obvious distinctive lithogeochemical features from early Cretaceous basalts from southeastern coast of China. They have higher HFSE, such as Th, Nb, Ta, Zr and Ti. Their element ratios related with HFSE, such as Zr/Ba, La/Nb, La/Ta, Zr/Y, Ti/Y, Ba/Nb, K/Ti and Rb/Zr are similar to those of OIB. The most samples have εNd(T) of -0.70-0.24, which are near chondrite. Some samples have higher εNd (T) of 1.87-3.55. Therefore, these basaltic magmas might be derived from depleted asthenospheric mantle. The lithogeochemical characteristics of the Fankeng basalts may be caused by interaction between asthenosphere and lithosphere at the time. The (Early-) Middle Jurassic basalts and gabbros from southeastern Hunan, southern Jiangxi and northern Guangdong provinces show similar geochemical features to those of the Fankeng basalts from the Yongding of Fujian. Occurrence of these OIB-type basalts in the area may be regarded as the petrological mark of upwelling of asthenosphere at the time. Upwelling of asthenosphere has led to tectonic extension and the formation of rifted basin in the area.

    Original languageEnglish
    Pages (from-to)1020-1031
    Number of pages12
    JournalScience in China, Series D: Earth Sciences
    Volume49
    Issue number10
    DOIs
    Publication statusPublished - Oct 2006

    Keywords

    • Basalts
    • Interaction between asthenosphere and lithosphere
    • Lithogeochemistry
    • Middle Jurassic
    • Southern China

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