吉林大学学报(地球科学版) ›› 2021, Vol. 51 ›› Issue (2): 416-428.doi: 10.13278/j.cnki.jjuese.20200069
• 地质与资源 • 上一篇
杨爱雪1,2, 孙德有2, 侯雪刚2,3, 王久良1, 张继林4, 李临位4
Yang Aixue1,2, Sun Deyou2, Hou Xuegang2,3, Wang Jiuliang1, Zhang Jilin4, Li Linwei4
摘要: 冀东地区位于华北板块北缘燕山造山带东部,矿产资源丰富,是中国金矿的主要产地之一,尤其是热液型金矿。峪耳崖金矿床是冀东众多热液型金矿床的典型代表,金矿主体赋存于侏罗纪峪耳崖花岗岩体内,少部分赋存于侵入花岗岩体的侏罗纪闪长岩脉中。闪长岩脉元素地球化学分析显示:w(SiO2)为51.99%~61.88%、Mg#值为0.37~0.64,w(Na2O+K2O)为5.07%~8.89%,A/NK为1.37~2.26,A/CNK为0.73~0.96,属准铝质高钾钙碱性系列;富集轻稀土元素和大离子亲石元素Rb、Ba、K、Sr,亏损重稀土元素和高场强元素Nb、Ta、Ti。锆石原位Hf同位素测试表明,εHf(t)为负值,介于-16.5~-6.5之间。综合研究认为:峪耳崖金矿区侏罗纪闪长岩浆源于俯冲流体交代的富集岩石圈地幔,岩浆上侵过程中受到华北板块古老下地壳物质的有限混染;成矿期闪长岩浆为金成矿提供了部分物质来源;峪耳崖金矿区闪长岩脉形成于古太平洋板块向欧亚大陆俯冲的动力学背景。
中图分类号:
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