U-Pb age of post-ore dykes in the Xiejiagou gold deposit and its constraints on ore-forming age, Northwest Jiaodong, China
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摘要:
胶西北地区是中国最大的金矿集区之一，金资源储量超过4500 t，金矿床受三山岛、焦家、招平3条断裂带及其分支断裂控制明显。谢家沟金矿位于招平断裂带的西侧，与区域上产于招平主干断裂的大尹格庄、夏甸等矿床不同，该矿床产出于主干断裂带的下盘，矿体与次一级的北北东向、北北西向断裂构造关系密切。基于坑道中发现的石英闪长玢岩和花岗闪长岩岩脉切割矿化蚀变现象，对2套岩脉进行U-Pb定年，获得其结晶年龄分别为118.0±1.1 Ma和118.4±0.9 Ma，确定了谢家沟金成矿作用的时间下限，指示区域上金成矿作用在118 Ma基本结束。推测区域成矿与郭家岭岩体形成之后、伟德山岩体形成之前的闪长类岩体关系密切。
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关键词:
- 胶西北 /
- 谢家沟 /
- 金矿 /
- LA-ICP-MS锆石U-Pb测年
Abstract:The northwest Jiaodong peninsula is one of the largest gold ore concentration areas in China, in which gold resource reserves exceed 4000 tons.Most of the deposits in the area are controlled by Sanshandao, Jiaojia and Zhaoping faults.The Xiejiagou gold deposit is located in the west and the footwall of Zhaoping fault, controlled by NWW- and NEE- secondary faults, which is different from the feature of the deposits which occur in Zhaoping fault such as Dayinggezhuang and Xiadian.Based on the phenomenon of existence of two kinds of dike, i.e., quartz diorite porphyry and granodiorite, which cut though mineralization and alteration in the tunnel, the authors conducted LA-ICP-MS U-Pb dating for the dikes.It is found that the U-Pb ages are 118.0±1.1 Ma and 118.4±0.9 Ma respectively, which suggests that the lower limit age of mineralization is 118 Ma in the Xiegagou gold deposit, and gold mineralization in northwest area of Jiaodong peninsula had been mainly completed by 118 Ma.It is inferred that regional mineralization was more probably related to diorite type intrusives between the formation of Guojialing and Weideshan intrusives.
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Keywords:
- Northwest Jiaodong /
- Xiejiagou /
- gold deposit /
- LA-ICP-MS zircon U-Pb dating
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致谢: 感谢招金集团金亭岭矿业公司为野外工作提供便利条件，感谢中国科学院地质与地球物理研究所范宏瑞研究员和审稿专家提出的建设性意见和建议。
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图 1 谢家沟金矿地质简图(据参考文献[24]修改)
1—玲珑花岗岩；2—中基性脉岩；3—硫铁矿带；4—断层及编号；5—蚀变带及编号；6—金矿体；7—金矿床；8—城市
Figure 1. Sketch geological map of the Xiejiagou gold deposit
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图 2 不同蚀变阶段矿物产出特征
a—玲珑黑云母花岗岩内发育第一阶段钾长石化蚀变，表现为石英+钾长石脉和弥散状钾长石化现象，钾长石化与黑云母花岗岩为过渡接触关系；b—第一阶段钾长石化被第二阶段绢英岩化叠加和交代，在绢英岩化带内可见钾长石化黑云母花岗岩交代残余；c—第一阶段钾长石化带被第三阶段石英+硫化物脉穿插，脉体边界截然；d—绢英岩化带内可见钾长石化黑云母花岗岩交代残余，二者同被第三阶段石英硫化物脉穿插，脉体边界截然
Figure 2. The mineral characteristics of the three alteration stages
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图 3 石英闪长玢岩和花岗闪长岩切割矿化蚀变现象
a—石英闪长玢岩侵入玲珑花岗岩，接触带切割第一阶段石英钾长石脉体；b—花岗闪长岩侵入玲珑花岗岩，接触带切割第一阶段钾化和第三阶段石英硫化物脉体；c—石英闪长玢岩标本照片；d—花岗闪长岩标本照片
Figure 3. Quartz diorite porphyry and granodiorite cutting though hydrothermal K-feldspar and gold-bearing quartz-sulfide vein
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图 4 石英闪长玢岩(XJG-GS-1)和花岗闪长岩(XJG-GS-2)锆石阴极发光(CL)图像
Figure 4. Zircon CL images of quartz diorite porphyry (XJG-GS-1) and granodiorite (XJG-GS-2)
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图 5 石英闪长玢岩(a)和花岗闪长岩(b)锆石U-Pb谐和图
Figure 5. U-Pb concordia diagrams of zircons from quartz diorite porphyry (a) and granodiorite (b)
表 1 石英闪长玢岩和花岗闪长岩LA-ICP-MS锆石U-Th-Pb同位素测定结果
Table 1 LA-ICP-MS zircon U-Th-Pb data of quartz diorite porphyry and granodiorite
测点
编号含量/10-6 Th/U 同位素比值 年龄/Ma 206Pb 232Th 238U 207Pb/206Pb 1σ 206Pb/238U 1σ 207Pb/235U 1σ 206Pb/238U 1σ 石英闪长玢岩XJG-GS-1 1 1.28 56.80 69.11 0.82 0.05 0.01 0.02 0.00 0.13 0.01 118.7 2.8 3 2.02 107.13 111.62 0.96 0.05 0.00 0.02 0.00 0.12 0.01 117.2 2.6 5 1.52 70.61 85.34 0.83 0.05 0.00 0.02 0.00 0.13 0.01 118.1 1.9 6 1.16 68.62 63.52 1.08 0.05 0.01 0.02 0.00 0.12 0.01 118.8 3.1 8 1.08 58.89 60.60 0.97 0.05 0.00 0.02 0.00 0.12 0.01 118.0 2.0 9 0.91 45.41 51.53 0.88 0.05 0.00 0.02 0.00 0.12 0.01 118.4 2.7 10 1.28 66.79 74.10 0.90 0.05 0.00 0.02 0.00 0.12 0.01 118.5 3.5 11 1.78 127.51 98.75 1.29 0.05 0.00 0.02 0.00 0.13 0.01 117.5 2.3 12 1.35 70.91 73.81 0.96 0.05 0.00 0.02 0.00 0.12 0.01 118.7 1.9 13 1.32 67.31 73.18 0.92 0.05 0.00 0.02 0.00 0.13 0.01 118.5 2.5 15 2.15 155.28 119.89 1.30 0.05 0.00 0.02 0.00 0.12 0.01 118.4 2.0 16 1.38 68.83 74.74 0.92 0.05 0.01 0.02 0.00 0.12 0.01 117.2 3.1 17 2.24 103.32 122.85 0.84 0.05 0.00 0.02 0.00 0.12 0.00 118.5 1.5 19 1.89 91.20 107.63 0.85 0.05 0.00 0.02 0.00 0.12 0.00 116.3 1.8 21 1.29 86.20 76.68 1.12 0.05 0.00 0.02 0.00 0.13 0.01 118.8 3.2 花岗闪长岩XJG-GS-2 2 1.15 56.09 63.89 0.88 0.05 0.00 0.02 0.00 0.12 0.01 118.3 1.8 3 1.99 123.79 108.63 1.14 0.05 0.00 0.02 0.00 0.12 0.01 119.4 2.1 4 1.63 78.09 88.55 0.88 0.05 0.00 0.02 0.00 0.12 0.01 119.3 2.7 6 1.53 76.97 83.73 0.92 0.05 0.00 0.02 0.00 0.12 0.01 118.2 1.9 7 1.10 60.58 61.13 0.99 0.05 0.01 0.02 0.00 0.12 0.01 119.0 4.4 8 4.79 291.47 261.54 1.11 0.05 0.00 0.02 0.00 0.12 0.01 118.1 1.8 9 1.41 65.22 77.77 0.84 0.05 0.00 0.02 0.00 0.12 0.01 119.3 2.4 10 2.17 123.58 119.68 1.03 0.05 0.00 0.02 0.00 0.12 0.01 119.0 1.8 11 1.46 93.02 81.28 1.14 0.05 0.00 0.02 0.00 0.12 0.01 118.9 2.4 12 2.79 145.66 151.55 0.96 0.05 0.00 0.02 0.00 0.13 0.01 118.2 2.6 13 4.28 279.43 236.29 1.18 0.05 0.00 0.02 0.00 0.13 0.00 118.0 1.7 14 2.18 137.79 119.17 1.16 0.05 0.00 0.02 0.00 0.12 0.01 118.2 1.8 17 1.56 94.58 87.20 1.08 0.05 0.00 0.02 0.00 0.12 0.01 118.3 2.0 18 2.40 153.05 134.54 1.14 0.05 0.00 0.02 0.00 0.12 0.00 117.7 1.6 19 2.76 128.33 157.31 0.82 0.05 0.00 0.02 0.00 0.13 0.01 118.4 2.5 20 1.71 89.53 97.90 0.91 0.05 0.00 0.02 0.00 0.12 0.01 117.5 1.9 21 4.21 217.62 233.61 0.93 0.05 0.00 0.02 0.00 0.12 0.00 119.0 1.6 22 1.99 150.06 117.70 1.27 0.05 0.00 0.02 0.00 0.13 0.01 118.1 3.3 23 5.09 308.27 290.86 1.06 0.05 0.00 0.02 0.00 0.12 0.00 118.3 2.2 24 1.28 66.46 71.45 0.93 0.05 0.00 0.02 0.00 0.13 0.01 119.1 2.2 25 3.00 119.75 168.91 0.71 0.05 0.00 0.02 0.00 0.12 0.00 118.1 1.7 
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