吉林大学学报(地球科学版) ›› 2020, Vol. 50 ›› Issue (5): 1570-1581.doi: 10.13278/j.cnki.jjuese.20190289
• 整装勘查区矿床成因与成矿作用研究专辑 • 上一篇 下一篇
杜泽忠1, 程志中1, 姚晓峰1, 于晓飞1, 孙海瑞1, 鲍兴隆2, 李少华2
Du Zezhong1, Cheng Zhizhong1, Yao Xiaofeng1, Yu Xiaofei1, Sun Hairui1, Bao Xinglong2, Li Shaohua2
摘要: 谢家沟金矿床位于胶西北焦家断裂带和招平断裂带之间。在系统观察坑道各类蚀变现象的基础上,发现围岩蚀变主要有钾长石化、硅化、黄铁矿化、绢云母化,其次可见绿泥石化和碳酸盐化等;基于蚀变的叠加和穿插关系查明了不同阶段的主要热液作用记录,从早到晚依次为钾长石化、黄铁绢英岩化、陡立石英硫化物细脉;蚀变具有明显的空间分带现象,从中心到两侧分别为陡立石英硫化物细脉带、黄铁绢英岩化带、钾长石化带。本次研究对蚀变钾长石开展了40Ar-39Ar精细测年工作,获得的坪年龄为(112.79±0.62)Ma(MSWD=5.76),与等时线年龄((115.56±1.72)Ma(MSWD=4.59))一致,限定了谢家沟金矿床的钾化蚀变年龄,与胶东地区获得的金成矿事件年龄相近,说明谢家沟金矿床与胶东地区金矿床是在同一成矿-热事件下形成的。结合区域岩浆演化特征,胶东地区在郭家岭岩体形成之后、在(120±10)Ma还存在一期与金成矿关系密切的岩浆活动。
中图分类号:
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