Geochronology, Geochemistry and Petrogenesis of the Early Cretaceous Volcanic Rocks of the Qingshan Group in the Linqu Area, Western Shandong Province
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    Abstract:

    In this paper, we report the geochronology, major and trace element geochemistry and SrNdHf isotope data for the early Cretaceous volcanic rocks of the Qingshan Group in the Linqu area, with an objective to constrain the petrogenesis. The volcanic rocks are mainly intermediate rocks, with a SiO2 content varying between 5441%~6781%. Rock association consists mainly of andesite, trachyandesite, trachyte and trachydacite. These volcanic rocks belong to calcalkaline series. Zircon LAICPMS UPb dating yields an age of 1213 ± 15 Ma for trachyandesite, indicating that the rocks crystallized in Early Cretaceous. The rocks are geochemically characterized by enrichment of LREE and LILE (e g, Rb, Ba, K), and depletion of HFSE (e g, Nb, Ta, Ti). These volcanic rocks have enriched SrNd isotopic compositions ((87Sr/86Sr)t=0704346~0705831, εNd(t)=-146~-95), and have low Hf isotopic composition (εHf(t)=-293~-216). The rocks have the similar Mg# values as the melts produced by metabasite, with large range of Cr (267×10-6~239×10-6) and Ni (10×10-6 ~697×10-6) content, and show significant mineral textural disequilibrium. The study further indicates that the Linqu volcanic rocks of the Qingshan Group may be the product of magma mixing between lower crustderived melts of ancient North China Craton and mantlederived melts of enriched mantle under the lithospheric extension setting.

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CAO Guangyue, XUE Huaimin, LIU Zhe, LU Zenglong.2018. Geochronology, Geochemistry and Petrogenesis of the Early Cretaceous Volcanic Rocks of the Qingshan Group in the Linqu Area, Western Shandong Province[J]. Acta Geologica Sinica,92(3):503-519

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  • Online: March 19,2018
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