福建紫金山矿田罗卜岭铜钼矿化斑岩锆石LA-ICP-MS U-Pb年龄及成矿岩浆高氧化特征研究

被引:37
作者
黄文婷 [1 ,2 ]
李晶 [1 ,3 ]
梁华英 [1 ]
王春龙 [1 ,2 ]
林书平 [1 ,2 ]
王秀璋 [1 ]
机构
[1] 中国科学院广州地球化学研究所,中国科学院矿物学与成矿学重点实验室
[2] 中国科学院大学
[3] 紫金矿业集团股份有限公司
关键词
斑岩铜钼矿床; 锆石U-Pb年龄; 花岗闪长斑岩; 紫金山;
D O I
暂无
中图分类号
P588.13 [脉岩、浅成岩(次火山岩)];
学科分类号
070901 ;
摘要
罗卜岭斑岩铜钼矿床是紫金山Cu-Au-Mo浅成低温-斑岩矿田内新近发现的大型斑岩铜钼矿床,本文在岩芯及光薄片系统观察的基础上,分析了矿化斑岩锆石LA-ICP-MSU-Pb年龄及锆石Ce4+/Ce3+比值。罗卜岭赋矿斑岩体可分为两期,早期为角闪黑云母花岗闪长斑岩及黑云母花岗闪长斑岩,晚期为黑云母花岗闪长斑岩。早期角闪黑云母花岗闪长斑岩和黑云母花岗闪长斑岩锆石LA-ICP-MSU-Pb年龄分别为103.7±1.2Ma,MSWD=0.33和103.0±0.9Ma,MSWD=1.00;晚期黑云母花岗闪长斑岩锆石LA-ICP-MSU-Pb年龄为97.6±2.1Ma,MSWD=6.00。罗卜岭成矿斑岩基质普遍发育硬石膏,两期成矿斑岩锆石都具较高的Ce4+/Ce3+平均值,在630~770之间,高于区内非成矿花岗岩锆石的Ce4+/Ce3+平均值(182~577),显示罗卜岭斑岩矿床成矿岩浆具有高氧逸度的特征。据罗卜岭斑岩矿床的形成时代、高氧逸度岩浆特征,结合华南地区中生代构造背景,我们初步认为罗卜岭斑岩矿床的形成可能和中生代古太平洋向北西西方向俯冲有关。
引用
收藏
页码:283 / 293
页数:11
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