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Mantle plume: the dynamic setting of the origin of Early Paleozoic mafic dykes in Ziyang, Shaanxi Province, Southern Qinling Block, China

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Abstract

The mafic dykes (dolerites) during the Early Paleozoic are widely spread in Langao-Ziyang, southern Qiling Block, and the investigation on these dykes are very important. Previous studies have mainly focused on the Silurian mafic dykes; however, research on the Earlier Paleozoic mafic dykes is relatively weak at present. Therefore, the overall understanding of the mantle source and genetic dynamic setting during the Early Paleozoic in this area is lacking. To study the accurate age and origin of the Early Paleozoic mafic dykes in Ziyang, southern Shaanxi Province, the mafic dykes from dabacunand Qinmingzhai were selected and the petrology, zircon U–Pb chronology, geochemistry, and Sr–Nd–Hf isotopes were studied. Analysis indicates that the mafic dykes studied are mainly composed of dolerite, and they are the products of the Early Ordovician (475.8–480.7 Ma). Furthermore, the dolerites belong to alkaline rock series, and they are characterized by enrichment in LREE, Rb, Ba, Sr, Nb, (87Sr/86Sr)i = 0.7020–0.7050, εNd(t) = 3.0–4.0), εHf (t) = 4.5–12.1,176Hf/177Hf = 0.282681–0.282844. This suggests that the mafic dyke were derived from the partial melting of a depleted lithospheric mantle, and the genetic process is mainly controlled by the mantle plume based on the discussion of the genetic model. Furthermore, the genetic process experienced the separation and crystallization of olivine and clinopyroxene at the same time, with little crustal contamination.

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Acknowledgements

The authors thank Dr. Shuqin Yang for assistance during the XRF analyses, Prof. Liang Qi and Xiaobiao Li for assistance during ICP-MS analyses, the technician for assistance during TIMS Sr–Nd isotopic analyses, and Profs. Xiaoming Liu for assistance during LA-ICP-MS U–Pb dating. This study was supported by the National Natural Science Foundation of China (Grant: 41573022).

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  1. College of Earth Science, Jilin University, Changchun, 130061, China

    Xiaoqing Chen

  2. State Key Laboratory of Continental Dynamics and Department of Geology, Northwest University, Xi’ an, 710069, China

    Shen Liu, Caixia Feng, Yan Fan, Kairui Tai, Tianjing Gao & Siyuan Zhang

  3. Solid Earth Studies Laboratory, Department of Geology, University of Regina, Regina, SK, S4S 0A2, Canada

    Ian M. Coulson

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Chen, X., Liu, S., Feng, C. et al. Mantle plume: the dynamic setting of the origin of Early Paleozoic mafic dykes in Ziyang, Shaanxi Province, Southern Qinling Block, China. Acta Geochim 39, 307–325 (2020). https://doi.org/10.1007/s11631-020-00415-5

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