南秦岭华阳花岗岩LA-ICP-MS锆石U-Pb年龄、地球化学和Hf同位素组成——对五龙岩体群成因的约束

被引:24
作者
孟旭阳 [1 ]
王晓霞 [2 ]
柯昌辉 [2 ]
李金宝 [3 ]
杨阳 [1 ]
吕星球 [1 ]
机构
[1] 中国地质大学地球科学与资源学院
[2] 国土资源部成矿作用与资源评价重点实验室/中国地质科学院矿产资源研究所
[3] 长安大学地球科学与资源学院
关键词
华阳岩体; 五龙岩体群; LA-ICP-MS锆石U-Pb年龄; Hf同位素; 花岗岩; 南秦岭;
D O I
暂无
中图分类号
P597.3 [];
学科分类号
摘要
华阳岩体位于南秦岭中部地区,岩体主体岩性为黑云母二长花岗岩。对中粒黑云母二长花岗岩和细粒黑云母二长花岗岩的LA-ICP-MS锆石U-Pb定年分别获得214Ma±2Ma和228Ma±2Ma的年龄,表明该岩体形成于晚三叠世。华阳花岗岩属于弱过铝质和高钾钙碱性系列,具有I-A型花岗岩过渡的特征,A/CNK值为1.01~1.14,Na2O为3.15%3.83%,K2O为3.04%5.70%,K2O/Na2O为0.84~1.80,Mg#为0.24~0.48;稀土元素配分曲线表现为右倾型,轻、重稀土元素分馏明显,具有显著的Eu负异常。该花岗岩富集Rb、K、Pb、Sr等大离子亲石元素,亏损Zr、Hf、Ta、Nb、P、Ti等高场强元素,表明华阳花岗岩的物源以壳源物质为主。锆石饱和温度和Ti温度计等的估算显示,华阳岩体岩浆源区的初始温度为750~800℃。花岗岩的锆石εHf(t)值变化范围较小,为-6.17~2.27,平均值为-3.19;二阶段模式年龄TDM2为1.65~1.12Ga,加权平均值为1.46Ga,结合区域地质背景和前人研究成果认为,华阳花岗岩是早—中元古代古老地壳物质部分熔融的结果,伴有少量幔源物质的加入;岩体的形成与华南板块和华北板块碰撞有关,是同碰撞向后碰撞构造体制转变或后碰撞伸展早期的产物。
引用
收藏
页码:1704 / 1719
页数:16
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