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Zircon U-Pb age, geochemistry and Sr-Nd-Pb isotopic compositions of the granite porphyry in the Miaoling gold deposit of Songxian County,Henan Province
Author(s): 
Pages: 424-440
Year: Issue:  3
Journal: Acta Petrologica et Mineralogica

Keyword:  LA-ICP-MS zircon U-Pb agegeochemistrySr-Nd-Pb isotopegenesis of rocksMiaoling gold deposit;
Abstract: 河南嵩县庙岭金矿区地处华北陆块南缘熊耳山-外方山地区,LA-ICP-MS锆石U-Pb定年结果表明,庙岭金矿区花岗斑岩的成岩年龄为157 Ma左右.岩石地球化学数据显示岩石具有高硅,富钾、铝而贫钠,低铁、镁、钙的特征,siO2含量为75.06% ~77.66%,全碱含量(Na2O+ K2O)为7.05%~7.39%;稀土元素总量较低,∑REE=25.74×10-6~32.63×10-6,轻重稀土元素分馏明显,LREE/HREE=6.74~ 9.53,Eu具有中等的负异常;微量元素富集Rb、K、Pb等大离子亲石元素和Th、U,亏损Nb、Ta、Ti等高场强元素和Ba、Sr.Pb同位素分析结果显示庙岭金矿区花岗斑岩的Pb主要来自于下地壳;全岩的(87Sr/86Sr)i=0.706 207~0.711 774,εNd(t)值变化于-19.0~-17.8之间,tDM2=2.39~2.49 Ga.岩石地球化学和Sr-Nd-Pb同位素组成特征显示庙岭金矿区花岗斑岩的源区物质主要来自于古老下地壳,可能为太古宙太华群.
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