鲁东昆嵛山地区宫家辉长闪长岩成因

岩石地球化学、锆石U-Pb年代学与Hf同位素制约

Translated title of the contribution: Petrogenesis of Gongjia gabbro-diorite in the Kunyushan area, Jiaodong Peninsula: Constraints from petro-geochemistry, zircon U-Pb dating and Hf isotopes

Fang Fang Hu*, Hong Rui Fan, Jin Hui Yang, Ming Guo Zhai, Lie Wen Xie, Yue Heng Yang, Xiao Ming Liu

*Corresponding author for this work

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Gongjia gabbro-diorite pluton is the biggest outcropped basic intrusion in the Kunyushan area, Jiaodong Peninsula. Zircon LA-ICP-MS U-Pb dating gives that its emplacement age of 113 ± 2Ma. Their low SiO2 and high MgO content (Mg# up to 56) indicate that the gabbro-diorite was originated from a mantle source. The rocks are enriched in LREEs and LILEs, such as K, Rb, Ba, Th and U, and depleted in HFSEs, such as Nb, Ti and P. They have initial Sr isotopic ratios (ISr) of 0.70745 - 0.70812 and εNd values varying from - 15.9 to - 12.0. Sr and Nd isotope, together with Pb isotope [(206Pb/204Pb)i = 17.108 - 17.239], of the gabbro-diorite are similar to those of mafic dykes and Cretaceous Qingshan group volcanic rocks in the Jiaolai basin. Zircon Hf isotope composition is relatively homogeneous with an average ε Hf(t) value of - 16.7, indicating that their parental magmas were derived from an enriched lithospheric mantle beneath the North China, coupled with fractional crystallization. The Gongjia gabbro and diorite pluton was result of lithospheric thinning in the Jiaodong Peninsula and even eastern North China craton in the early Cretaceous.

Original languageChinese
Pages (from-to)369-380
Number of pages12
JournalActa Petrologica Sinica
Volume23
Issue number2
Publication statusPublished - 2007
Externally publishedYes

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Keywords

  • Gabbro-diorite
  • Geochemistry
  • Gongjia
  • Jiaodong Peninsula
  • LA-ICP-MS U-Pb zircon dating
  • Petrogenesis
  • Zircon Hf-isotope

Cite this

Hu, F. F., Fan, H. R., Yang, J. H., Zhai, M. G., Xie, L. W., Yang, Y. H., & Liu, X. M. (2007). 鲁东昆嵛山地区宫家辉长闪长岩成因: 岩石地球化学、锆石U-Pb年代学与Hf同位素制约. Acta Petrologica Sinica, 23(2), 369-380.