The chronological constraint of Jixinling fault and its implication for metallogenic potential in Wulong gold deposit, Liaodong peninsula, China
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摘要:
五龙金矿是辽东地区形成于早白垩世的代表性石英脉型金矿, 与胶东地区"玲珑式"金矿相似。胶东地区早白垩世金矿受北东向断裂控制且规模宏大, 五龙金矿已知矿体主要赋存于北西向和近南北向断裂内, 其北东向断裂研究程度较低、成矿潜力尚不清楚。针对五龙矿区的鸡心岭断裂开展了地质调查, 对侵位其中的岩脉和热液白云母进行定年, 为断裂内构造-岩浆-热液活动提供年代学约束。调查发现, 鸡心岭断裂整体为脆性变形, 具有多期活动的特征, 依次有煌斑岩、含白云母石英脉和闪长岩脉侵入其中。测年结果显示, 煌斑岩的锆石206Pb/238U年龄加权平均值为132.1±1.7 Ma, 热液白云母的40Ar/39Ar坪年龄为126.8±0.5 Ma, 闪长岩的锆石206Pb/238U年龄加权平均值为112.9±1.4 Ma。年龄数据指示, 鸡心岭断裂在132 Ma之前形成, 在132~113 Ma之间经历了岩浆-热液活动, 依次对应区域上的早白垩世初期北北西-南南东向挤压和早白垩世中期北西-南东向/北西西-南东东向伸展背景。从现有调查程度看, 鸡心岭断裂较胶东地区北东向断裂具有序次低、规模小、构造和流体活动较弱的特征。辽东地区燕山期金矿找矿应注意关注更高序次的低角度断裂, 五龙一带的北东向断裂找矿工作应优先评价断裂走向变化、深部由陡变缓的部位。
Abstract:Wulong gold deposit is a typical quartz vein-type ore deposit formed in the Early Crataceous in Liaodong peninsula, similar in many aspects to the Linglong-type gold deposit in Jiaodong area.The gold deposits in Jiaodong area mainly occurred in the NE trending fault.However, most of orebodies in the Wulong deposit are controlled by the NW and N-S trending fault.The study of the NE trending fault are limited within the Wulong deposit and their ore-potential are still unclear.Geological survey were conducted for Jixinling fault, and chronology study of dikes and hydrothermal muscovite in the fault were also carried out.Jixinling fault, being brittle, experienced multi-stage of structural motion, was intruded by lamphoryrye dikes, muscovite-bearing quartz veins and diorite dikes sequentially.U-Pb dating of the zircons from the lamprophyre and the diorite yields 206Pb/238U mean age of 132.1 ±1.7 Ma and 112.9 ±1.4 Ma, respectively.The hydrothermal muscovite gives a 40Ar/39Ar plateau age of 126.8 ±0.51 Ma.It is indicated that, Jixinling fault was formed before 132 Ma, and magma and hydrothermal motion occurred in the fault during 132~113 Ma.The Jixinling fault fracturing, the intrusion of dikes and veins were probably correlated to the NNW-SSE compression in the earlier time of Early Crataceous, NW-SE/NWW-SEE extension in the middle of Early Crataceous, respectively.Jixinling fault was formed in a lower order than NE trending fault in Jiaodong area, with less structural intensity, smaller fracture zone and alteration range.The further exploration for NE trending faults of Early Crataceous gold systems in Liaodong peninsula should focus on low-angle faults with higher order, and more attention should be paid to the area where the faults' attitude switches suddenly for the NE trending faults in the Wulong orefield.
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图 1 五龙矿集区大地构造位置图(a)(据Lin et al., 2008修改)、区域地质简图(b)和代表性剖面(c)(据肖昌浩等，2020)
Figure 1.
图 2 五龙金矿矿区地质简图(据Yu et al., 2018修改)
Figure 2.
表 1 鸡心岭断裂内煌斑岩(JXLD1-6-6)和闪长岩(D0046-4-4)锆石U-Th-Pb测试结果
Table 1. Zircon U-Th-Pb age data for the lamprophyre(JXLD1-6-6) and diorite(D0046-4-4)from the Jixinling fault
测点编号 Pb 232Th 238U Th/U 同位素比值 年龄/Ma 含量/10-6 207Pb/ 206Pb 1σ 206Pb/ 238U 1σ 207Pb/ 235U 1σ 207Pb/235U 1σ 206Pb/238U 1σ 208Pb/232U 1σ JXLD1-6-6-02 3 158 87 1.81 0.055 0.005 0.020 0.001 0.148 0.014 139.88 12.12 128.96 3.18 127.15 7.63 JXLD1-6-6-03 27 1196 962 1.24 0.053 0.002 0.021 0.001 0.151 0.007 142.64 6.49 131.19 4.71 123.94 10.04 JXLD1-6-6-04 32 1586 1049 1.51 0.049 0.002 0.020 0.000 0.133 0.005 126.64 4.79 125.04 2.67 116.70 5.77 JXLD1-6-6-05 7 300 228 1.31 0.056 0.003 0.020 0.000 0.153 0.008 144.84 6.92 127.95 2.72 123.55 6.19 JXLD1-6-6-08 2 80 71 1.12 0.053 0.006 0.021 0.001 0.151 0.016 142.89 14.35 134.59 4.17 130.66 7.96 JXLD1-6-6-09 8 265 296 0.90 0.054 0.004 0.022 0.001 0.157 0.014 148.40 12.08 138.03 6.28 132.48 9.14 JXLD1-6-6-10 3 193 98 1.96 0.051 0.005 0.020 0.000 0.137 0.013 130.10 11.47 128.90 2.92 117.93 5.96 JXLD1-6-6-11 26 661 941 0.70 0.052 0.002 0.021 0.000 0.148 0.005 139.83 4.14 132.57 1.23 125.86 5.50 JXLD1-6-6-15 20 579 729 0.79 0.052 0.002 0.021 0.000 0.148 0.004 140.20 3.73 132.67 1.04 129.50 5.30 JXLD1-6-6-21 3 130 77 1.70 0.053 0.006 0.021 0.000 0.148 0.016 140.00 14.37 131.27 2.72 140.39 8.66 JXLD1-6-6-22 18 513 704 0.73 0.045 0.002 0.021 0.001 0.131 0.005 124.70 4.65 136.58 3.16 131.71 5.80 JXLD1-6-6-25 5 159 179 0.89 0.047 0.004 0.021 0.000 0.138 0.012 130.97 10.40 134.96 2.05 140.24 7.64 D0046-4-4-01 2 125 55 2.26 0.048 0.004 0.017 0.000 0.109 0.009 104.91 8.59 107.73 2.79 124.59 6.96 D0046-4-4-02 3 148 129 1.15 0.050 0.005 0.018 0.000 0.123 0.011 118.09 10.05 116.48 1.87 130.72 6.50 D0046-4-4-09 41 1820 1606 1.13 0.049 0.001 0.018 0.000 0.118 0.002 113.71 1.92 113.14 0.73 115.74 4.36 D0046-4-4-10 4 300 111 2.71 0.052 0.004 0.018 0.000 0.128 0.009 122.52 8.29 116.65 2.63 113.48 4.88 D0046-4-4-12 2 202 41 4.97 0.057 0.009 0.017 0.001 0.123 0.018 118.01 16.22 108.41 3.83 105.05 6.33 D0046-4-4-13 3 104 105 0.99 0.053 0.003 0.018 0.000 0.127 0.009 121.79 7.93 112.29 1.84 112.73 6.37 D0046-4-4-14 10 503 381 1.32 0.050 0.002 0.018 0.000 0.120 0.005 115.43 4.97 112.16 1.17 110.60 4.85 D0046-4-4-17 3 253 91 2.78 0.051 0.004 0.017 0.000 0.120 0.009 114.93 8.41 110.83 2.06 106.07 5.08 D0046-4-4-20 2 103 72 1.44 0.055 0.006 0.018 0.000 0.128 0.011 122.41 10.32 112.81 3.16 114.03 5.55 
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表 2 热液白云母40Ar/39Ar测试结果
Table 2. 40Ar/39Ar data of the hydrothermal muscovite
温阶/℃ (40Ar/39Ar)m (36Ar/39Ar)m (37Ar/39Ar)m 40Ar*/% F(40Ar*/39Ar) 39Ar/10-14mol 39Ar/% 年龄/Ma ±1σ/Ma 800 34.5048 0.0673 0.2309 42.39 14.6293 0.41 0.92 156.00 4.10 900 17.2617 0.0142 0.0111 75.69 13.0654 4.01 8.94 139.90 1.10 950 11.9211 0.0003 0.0001 99.10 11.8143 14.94 33.33 127.00 0.61 1000 11.9095 0.0003 0.0045 99.30 11.8265 5.80 12.93 127.13 0.62 1050 11.9318 0.0003 0.0024 99.11 11.8253 2.50 5.58 127.12 0.62 1100 11.9467 0.0004 0.0011 99.00 11.8270 3.64 8.13 127.13 0.62 1200 11.9149 0.0003 0.0018 99.25 11.8253 8.71 19.43 127.12 0.61 1300 11.8854 0.0002 0.0019 99.41 11.8156 4.05 9.03 127.02 0.61 1400 12.1779 0.0018 0.0624 95.60 11.6426 0.77 1.71 125.22 0.64
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表 3 五龙金矿鸡心岭断裂与胶东地区主干控矿断裂特征对比
Table 3. Comparison between Jixinling fault in Wulong gold deposit and major ore-controlling fault in Jiaodong area
异同点 鸡心岭断裂 胶东主干控矿断裂 断裂序次 Ⅲ级 Ⅱ级 变形层次 脆性 脆性—韧脆性 破碎带宽度 数米至数十米 数十米至数百米 断裂产状 高角度陡倾斜 上陡下缓，发育断坡断坪组合 初始运动学特征 左行平移 左行斜冲/逆冲 成矿/流体作用时代 120 Ma左右 120 Ma左右 成矿期运动学特征 正断 正断 矿化特征 石英脉型 蚀变岩型 蚀变特征 蚀变仅在断裂带内发育，以硅化为主，无分带现象 蚀变在断裂带两侧数十米至数百米对称发育，蚀变分带明显
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