黄金科学技术 ›› 2019, Vol. 27 ›› Issue (6): 791-801.doi: 10.11872/j.issn.1005-2518.2019.06.791
• 矿产勘查与资源评价 • 下一篇
陈玉民1(),曾庆栋2,3,4(
),孙之夫5,王昭坤1,范宏瑞2,3,4,肖风利1,褚少雄2,3
Yumin CHEN1(),Qingdong ZENG2,3,4(
),Zhifu SUN5,Zhaokun WANG1,Hongrui FAN2,3,4,Fengli XIAO1,Shaoxiong CHU2,3
摘要:
胶东金矿集区形成于早白垩世构造体制转折期,具有大规模爆发成矿特征,是世界上重要的金矿集中区之一。针对胶东金矿集区成矿物质来源这一科学问题,采用Au元素地球化学分析法系统分析该区地表和深钻样品,揭示该区金的地球化学背景特征,为探讨该区Au元素高强度巨量堆积的成矿作用机制提供地球化学场制约。结果显示:地表胶东群变质岩具有中部高(金丰度均值为1.35×10-9)、东部及西部低(金丰度均值分别为0.95×10-9和0.76×10-9)的地球化学背景场特征;深钻岩石样品的金丰度均值均低于大陆地壳克拉克值及华北地台大陆地壳的金丰度平均值,同样显示亏损地球化学背景场特征。因此,在胶东金矿集区存在金的地球化学亏损场,结合矿区内围岩中普遍存在的热液活动迹象,认为胶东群和中生代花岗岩可能为胶东金矿的形成提供了部分成矿物质。
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