黄金科学技术 ›› 2024, Vol. 32 ›› Issue (5): 798-812.doi: 10.11872/j.issn.1005-2518.2024.05.146
王斌1,2(),宋明春3(),刘志宁1,李健4,董磊磊5,张艺多1,蒋雷1,王润生6,董小涛1,刘家良1
Bin WANG1,2(),Mingchun SONG3(),Zhining LIU1,Jian LI4,Leilei DONG5,Yiduo ZHANG1,Lei JIANG1,Runsheng WANG6,Xiaotao DONG1,Jialiang LIU1
摘要:
胶东地区是我国最重要的金矿集区,金矿床的时空分布与晚中生代花岗岩类密切相关,其中早白垩世伟德山期花岗岩侵位时间与大规模金成矿时间一致,是重要的成矿期地质体。隶属于伟德山期花岗岩的周官岩体与金成矿时空关系密切。选择周官岩体作为研究对象,系统开展了岩石学、锆石U-Pb同位素测年和全岩地球化学研究工作。结果表明:周官岩体侵位时代为(119.4±1.1)~(118±1.0)Ma,与金成矿同期;岩体具有低硅、高镁和富钠,以及相对高的Cr、Ni、Co、Sc含量、Sr/Y比值和明显贫化的Zr含量特征,Mg#值介于55.83~59.26,表现为高镁闪长岩特征。岩石属高钾钙碱性系列,为高镁闪长岩类,岩浆源于富集岩石圈地幔的部分熔融,并混染了部分地壳物质;周官高镁闪长岩体和伟德山期花岗岩的岩浆侵位导致地壳浅部发生剧烈隆起,形成伸展构造,为成矿流体运移、成矿物质富集和矿体定位提供了良好通道和有利空间。
中图分类号:
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