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通过对胶东半岛西北部超大型破碎带蚀变岩型金矿 -新城金矿的强烈热液交代成因黄铁绢英岩 Rb- Sr等时线法测年 ,获得 116 .6± 5 .3Ma成矿年龄。结合本区焦家、仓上等大型 -超大型金矿蚀变矿物、石英流体包裹体的 Rb- Sr等时线年龄、K- Ar年龄 (10 5± 7Ma;10 6± 2 Ma;113.5± 0 .6 Ma)等前人成果 ,确定胶东半岛西北部破碎带蚀变岩型金矿成矿时代主要集中在 10 0～ 117Ma。与围岩花岗岩、花岗闪长岩的成岩年龄 (16 0～ 15 0 Ma;130～ 12 6 Ma)存在着近 10 Ma的时差 ,并根据(87Sr/ 86 Sr) i比值以及已有的 C、H、O稳定同位素资料表明 ,即使成矿物质部分来源于围岩花岗岩类 ,但成矿作用与岩浆活动无明显的成因关系 ,而是深部循环的大气降水或幔源 C- H - O流体参与成矿作用的结果
By means of Rb-Sr isochronism dating of intense hydrothermal metasomatism of ultra-large-scale crustal alteration rock gold deposit-Xincheng gold deposit in northwestern Jiaodong Peninsula, 116.6 ± 5.3Ma metallogenic age . Combined with the alteration minerals such as Jiaojia and Cangshang in this area, the Rb-Sr isochron age, K-Ar age (105 ± 7Ma, 106 ± 2 Ma, 113.5 ± 0.6 Ma) and other predecessors’ achievements, it was confirmed that the mineralization age of the crustal altered rock type gold deposits in the northwestern part of the Jiaodong Peninsula mainly concentrated in 10 0 ~ 117Ma. There is a time difference of about 10 Ma with the age of rock granites and granodiorites (16 0-15 0 Ma and 130-126 Ma). According to the ratio of (87Sr / 86 Sr) i and the existing C The H, O stable isotope data show that although the metallogenic materials are partly derived from the granitic rocks of the surrounding rocks, the mineralization has no obvious genetic relationship with the magmatic activity, but the deep circulation of atmospheric precipitation or mantle C-H-O fluid Participation in mineralization results