Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (6): 1732-1745.doi: 10.13278/j.cnki.jjuese.201706112

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Petrogenesis of Ore-Bearing Dioritic Pluton in Jinling Area in Western Shandong:Evidence from Zircon U-Pb Chronology and Petro-Geochemistry

Zhang Chao1, Cui Fanghua1, Zhang Zhaolu1, Geng Rui2, Song Mingchun3   

  1. 1. School of Resources and Environmental Engineering, Shandong University of Technology, Zibo 255049, Shandong, China;
    2. Shandong Gold Group Co. LTD, Jinan 255014, China;
    3. Shandong Bureau of Geology and Mineral Resources Exploration and Development, Jinan 255013, China
  • Received:2017-03-07 Online:2017-11-26 Published:2017-11-26
  • Supported by:
    Supported by the Young Scientists Fund of Shandong Province(ZR2016DB08) and Taishan Scholar Special Project Funds(ts201511076)

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Abstract: The Jinling dioritic pluton in west Shandong is mainly composed of pyroxene diorite and biotite diorite. The zircon U-Pb dating results reveal that the dioritic pluton was emplaced in Early Cretaceous(129.17±0.96) Ma and (130.15±0.65)Ma. The major element data show that the diorites contain low contents of SiO2, K2O, and high contents of Na2O, Fe2O3, MgO, Mg# and Al2O3. The Na2O/K2O ratios range from 1.08 to 2.96. The diorites are enriched relatively in sodium and alumina. The diorites have calc-alkaline characteristics according to the Ritttman index(1.95-2.96). The contents of Ni、Cr、Co are 99.00×10-6-237.00×10-6,270.00×10-6-600.00×10-6,19.00×10-6 -44.00×10-6 respectively, similar to the contents of mantle magma. The chondrite standardized REE curves show that they are enriched in light REE, and depleted of heavy REE with weak Eu anomaly (0.91-1.12). The diorites are enriched in large ion lithophile element (LILE) Ba, K, Sr, and high field strength elements (HFSE) Nd, while depleted of high field strength elements (HFSE) Rb, Nb, Ta, and Zr. The residual ancient zircons (~2.5 Ga) in the sample (N1) indicate a mix of ancient lower crust occurred in the source area. The Jinling pluton might be formed under a lithospheric extension related to the rollback of the subducted Pacific plate, and the magma was the mixing product of the siliceous crust melted through underplating of basaltic magma, and the mantle enriched basaltic magma.

Key words: petro-geochemistry, zircon U-Pb chronology, diorite, Luxi area, Pacific plate

CLC Number: 

  • P588.12
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