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 journalArticlepeer-review

28 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.

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