吉林大学学报(地球科学版) ›› 2017, Vol. 47 ›› Issue (6): 1732-1745.doi: 10.13278/j.cnki.jjuese.201706112
张超1, 崔芳华1, 张照录1, 耿瑞2, 宋明春3
Zhang Chao1, Cui Fanghua1, Zhang Zhaolu1, Geng Rui2, Song Mingchun3
摘要: 鲁西金岭闪长岩位于华北克拉通东南部,主要由辉石闪长岩-黑云母闪长岩组成。LA-ICP-MS锆石U-Pb定年测定闪长岩侵位年龄为(129.17±0.96)和(130.15±0.65) Ma,属于早白垩世岩浆活动的产物。闪长岩SiO2和K2O的质量分数较低,MgO、Na2O、Fe2O3、MgO和Al2O3的质量分数较高,Mg#为58.00~70.00。Na2O/K2O为1.08~2.96,相对富钠高铝,其里特曼指数为1.95~2.96,具有钙碱性系列的岩浆演化趋势。金岭闪长岩w(Ni)为99.00×10-6~237.00×10-6,w(Cr)为270.00×10-6~600.00×10-6,w(Co)为19.00×10-6~44.00×10-6,表明其具有幔源岩浆的属性。稀土元素球粒陨石标准化曲线表明样品具有富集轻稀土元素(LREE),亏损重稀土元素(HREE)以及弱Eu (δEu为0.91~1.12)异常的特征。所有样品富集大离子亲石元素(Ba、K、Sr)和高场强元素Nd,亏损高场强元素Rb、Nb、Ta、Zr。样品中约2.5 Ga古老锆石的存在证明岩浆源区受到古老下地壳物质的混染作用。鲁西金岭地区闪长岩应形成于太平洋板块俯冲后后撤引起的伸展环境,其岩浆源区是富集地幔起源的基性岩浆底侵华北古老下地壳并与下地壳熔融形成的壳源酸性岩浆混合过程的产物。
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