苏鲁造山带A型花岗岩的元素地球化学及其成因

被引:14
作者
王涛 [1 ,2 ]
刘燊 [1 ,3 ]
胡瑞忠 [1 ]
冯彩霞 [1 ]
齐有强 [1 ,2 ]
冯光英 [1 ,2 ]
王长华 [4 ]
机构
[1] 中国科学院地球化学研究所/矿床地球化学国家重点实验室
[2] 中国科学院研究生院
[3] 西北大学大陆动力学国家重点实验室
[4] 东营市勘察测绘院
关键词
A型花岗岩; 元素地球化学; 岩石成因; 岩石圈地幔; 苏鲁造山带;
D O I
10.13278/j.cnki.jjuese.2009.04.002
中图分类号
P588.121 [];
学科分类号
摘要
苏鲁造山带花岗岩SiO2质量分数变化范围为71.3%74.5%,以富碱(Na2O+K2O为8.66%9.60%)、高钾(K2O为4.95%5.89%)、富轻稀土元素而亏损重稀土元素、明显的负铕异常(δEu=0.51~0.61)、较高的Ga/Al(×104)比值(2.85~3.41)和Zr+Nb+Ce+Y值(384~714)×10-6、富集Rb、Th、K、La、Nd、Hf、Zr和Pb以及亏损Ba、Ta、P和Ti为特征。主微量元素研究表明,所研究花岗岩为过铝质(A/KNC为1.90~2.17)A型花岗岩,为华北板块富集岩石圈地幔的部分熔融的产物。岩浆在上升侵位的过程中没有受到地壳物质的混染,但在成岩过程中存在斜长石、钾长石、黑云母、磷灰石和钛铁矿等矿物的分离结晶作用,锆石饱和温度计算表明岩浆的结晶温度大致为876~961℃。
引用
收藏
页码:676 / 688
页数:13
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