安徽狮子山矿田南洪冲岩体形成时代及成因机制研究

Translated title of the contribution: Geochronology and origin of Nanhongchong pluton in Shizishan ore-field, Anhui province

Xiao Nan Yang*, Zhao Wen Xu, Jun Zhang, Yun Jian Wang, Xi Sheng Xu, Shao Yong Jiang, Hong Fei Ling, Liang Gen Liu, Da Yuan Chen

*Corresponding author for this work

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Nanhongchong pluton in Shizishan ore-field, Anhui province, is spatially close to those Yanshanian plutons that have metallogenic relations with important copper-iron-gold-sulfur deposits. Zircon U-Pb LA-ICPMS dating yields an age of 141.2 ± 1.6Ma, which meets the ages of other plutons in the ore-field and suggests the magmatism event occurred between late Jurassic and early cretaceous. Nanhongchong pluton was metaluminous calc-alkaline granodiorite characterized by high alkali (Na2O > K2O). Rb, Ba, Sr, Th and U were enriched, while Nb, Ta and Ti were depleted. REE showed strong LREE enrichment with (La/Yb)N ratios of 21.07∼24.28 and the absence of Eu anomaly with δEu values of 0.92∼1.03. Isotope geochemical study revealed initial 87Sr/86Sr ratios were 0.70792∼0.70793 while εNd(t) values were -9.5 ∼ -9.1, and Nd model ages (1.67 ∼ 1.71 Ga) were Mesoproterozoic. The characteristics above in accord with former relevant data indicate that the mixed magma derived from enriched mantle, intruded and fractionated in a crustal extension-thinning tectonic environment while assimilated a proportion of the crust. Particularly, the magma in Shizishan ore-field was rather evolved when Nanhongchong pluton formed and fractional crystallization was the dominant process then, which suggested moderately diverse magmatism.

Original languageChinese
Pages (from-to)1543-1551
Number of pages9
JournalActa Petrologica Sinica
Volume23
Issue number6
Publication statusPublished - 2007
Externally publishedYes

Keywords

  • Element and Sr-Nd isotopic Geochemistry
  • LA-ICPMS zircon U-Pb dating
  • Nanhongchong pluton in Tongling
  • Petrogenesis of granodiorite

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    Yang, X. N., Xu, Z. W., Zhang, J., Wang, Y. J., Xu, X. S., Jiang, S. Y., ... Chen, D. Y. (2007). 安徽狮子山矿田南洪冲岩体形成时代及成因机制研究. Acta Petrologica Sinica, 23(6), 1543-1551.