Stream sediment geochemistry and prospecting prospect in Dachebeigou area of Jilin Province
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摘要:
吉林大车背沟地区位于兴蒙造山带东段南缘, 地球化学景观属于长白山森林沼泽景观区.该区及周边已发现桦甸市二道甸子金矿、幸福锑矿和蛟河市漂河川铜镍矿等矿产地76处, 具有良好的找矿前景.以1:5万水系沉积物测量17种元素含量数据为基础, 查明了各种元素的相关性、富集贫化特征、元素组合特征和主要元素的找矿潜力.结合区域地质背景及1:20万水系沉积物数据, 认为Au、Cu、Ni、Sb是区内主要成矿元素, 且元素异常套合较好.根据研究区成矿地质条件, 圈定综合异常25处、找矿远景区2处, 为下一步找矿工作提供了依据.
Abstract:The Dachebeigou area of Jilin Province is located in the southern margin of eastern Xing'an-Mongolia orogenic belt, geochemically belonging to Changbai Mountain forest swamp landscape area. There are 76 mineral deposits such as Erdaodianzi Au deposit, Xingfu Sb deposit and Piaohechuan Cu-Ni deposit discovered in and around the study area, with good prospecting prospect. The correlations, enrichment-depletion characteristics and combination features of elements, as well as the prospecting potential of major elements, are ascertained based on the content data of 17 elements by the 1:50 000 stream sediment survey. Combined with regional geological background and 1:200 000stream sediment survey data, it is considered that Au, Cu, Ni and Sb are the main metallogenic elements, and their geochemical anomalies are well-matched. According to the metallogenic conditions of the area, 25 comprehensive anomaly areas and 2 prospecting prospective areas are delineated, which provides basis for further prospecting work.
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Key words:
- stream sediment /
- element anomaly /
- geochemistry /
- prospective area /
- Jilin Province
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表 1 研究区各地质单元1:5万水系沉积物测量元素地球化学统计参数
Table 1. Geochemical parameters of elements in geological units by 1:50 000 stream sediment survey
地质体 参数 Au Ag As Sb Hg Sn Bi Cd Co Cu Mo Pb V W Ni Mn Zn 全区 背景值 0.60 0.06 7.45 0.38 0.09 1.75 0.17 0.08 9.06 6.44 1.35 24.07 44.77 1.11 8.02 741.3 41.50 X 0.41 0.07 9.27 0.54 0.03 3.86 0.20 0.13 14.51 17.17 1.69 21.37 78.01 1.37 21.41 873.2 81.06 S 0.17 0.03 5.09 0.27 0.02 2.81 0.12 0.06 8.84 9.85 1.03 5.34 45.24 0.69 16.84 543 38.29 K 0.68 1.24 1.24 1.41 0.31 2.20 1.19 1.64 1.60 2.67 1.25 0.89 1.74 1.24 2.67 1.18 1.95 CV 0.43 0.50 0.55 0.50 0.78 0.73 0.60 0.47 0.61 0.57 0.61 0.25 0.58 0.51 0.79 0.62 0.47 新近系上更新统军舰山组 X 0.55 0.09 20.50 0.93 0.03 3.70 0.22 0.16 32.30 22.70 1.65 28.70 122.1 1.48 23.80 1699 81.70 S 0.33 0.05 12.10 0.48 0.01 2.30 0.10 0.08 28.10 11.20 0.95 11.20 71.70 0.70 12.20 1284 29.30 K 1.36 1.25 2.21 1.74 0.97 0.95 1.07 1.21 2.23 1.32 0.98 1.34 1.57 1.08 1.11 1.95 1.01 CV 0.59 0.55 0.59 0.52 0.53 0.62 0.47 0.51 0.87 0.49 0.57 0.39 0.59 0.47 0.51 0.76 0.36 新近系中更新统老爷岭组 X 0.38 0.06 8.90 0.59 0.05 5.90 0.26 0.18 23.70 28.10 1.79 22.80 113.8 1.64 44.10 1339 116.9 S 0.14 0.04 2.70 0.19 0.02 2.90 0.13 0.07 9.20 10.90 0.62 5.50 34.90 0.46 21.70 573 28.50 K 0.93 0.90 0.96 1.09 1.67 1.53 1.31 1.40 1.63 1.64 1.06 1.07 1.46 1.19 2.06 1.53 1.44 CV 0.38 0.57 0.31 0.33 0.44 0.50 0.48 0.39 0.39 0.39 0.35 0.24 0.31 0.28 0.49 0.43 0.24 白垩系下统大砬子组 X 0.34 0.06 7.70 0.47 0.04 4.60 0.21 0.16 26.60 25.90 1.55 19.50 107.8 1.40 56.90 131 96.00 S 0.13 0.04 3.20 0.18 0.02 3.40 0.12 0.08 14.90 14.70 0.65 5.80 47.90 0.52 43.70 249 38.30 K 0.84 0.92 0.83 0.88 1.45 1.18 1.06 1.21 1.84 1.51 0.92 0.91 1.38 1.02 2.66 0.15 1.18 CV 0.37 0.65 0.42 0.38 0.58 0.74 0.54 0.50 0.56 0.57 0.42 0.30 0.44 0.37 0.77 1.90 0.40 白垩系下统长财组 X 0.41 0.08 6.70 0.52 0.02 1.70 0.15 0.08 9.90 9.50 1.96 22.00 38.60 1.09 8.10 645 42.00 S 0.24 0.03 3.40 0.23 0.01 1.00 0.07 0.03 4.00 4.90 1.46 4.60 20.80 0.61 4.50 263 22.00 K 1.01 1.12 0.72 0.97 0.59 0.43 0.75 0.64 0.68 0.55 1.16 1.03 0.49 0.79 0.38 0.74 0.52 CV 0.59 0.41 0.50 0.45 0.57 0.61 0.49 0.30 0.40 0.52 0.74 0.21 0.54 0.56 0.56 0.41 0.52 侏罗系帽儿山组 X 0.42 0.06 9.20 0.57 0.03 4.30 0.18 0.15 22.40 22.30 1.44 21.80 105.7 1.72 36.50 702 87.50 S 0.17 0.03 4.60 0.30 0.02 3.00 0.11 0.06 11.00 10.90 0.73 5.30 44.20 0.75 19.00 703 28.50 K 1.04 0.90 0.99 1.06 1.10 1.13 0.89 1.16 1.55 1.30 0.85 1.02 1.35 1.26 1.71 0.80 1.08 CV 0.40 0.56 0.50 0.54 0.65 0.69 0.59 0.40 0.49 0.49 0.51 0.24 0.42 0.43 0.52 1.00 0.33 二叠系范家屯组 X 0.72 0.07 21.60 1.12 0.02 3.60 0.21 0.13 15.30 19.50 2.82 21.30 83.80 2.21 20.30 74 74.90 S 0.63 0.04 16.10 0.77 0.01 2.20 0.15 0.05 8.20 8.70 1.32 5.30 35.70 0.82 11.70 640 29.30 K 1.77 1.07 2.33 2.09 0.75 0.95 1.03 1.00 1.05 1.14 1.67 1.00 1.07 1.61 0.95 0.85 0.92 CV 0.88 0.53 0.74 0.68 0.53 0.62 0.71 0.37 0.53 0.44 0.47 0.25 0.43 0.37 0.58 0.87 0.39 寒武-奥陶系黄英屯组 X 0.61 0.09 24.60 0.99 0.02 3.40 0.21 0.14 15.20 20.20 1.74 21.70 83.00 1.77 24.80 1027 73.30 S 0.33 0.05 15.80 0.59 0.01 1.90 0.09 0.06 6.90 7.70 1.05 5.40 36.40 0.75 13.90 353 26.60 K 1.51 1.26 2.66 1.86 0.84 0.88 1.04 1.09 1.05 1.17 1.03 1.02 1.06 1.29 1.16 1.18 0.90 CV 0.53 0.54 0.64 0.59 0.61 0.57 0.43 0.39 0.45 0.38 0.60 0.25 0.44 0.42 0.56 0.34 0.36 早侏罗世花岗岩 X 0.43 0.06 8.80 0.49 0.01 3.00 0.17 0.11 10.00 11.50 1.61 21.50 57.40 1.30 10.70 766 65.90 S 0.21 0.03 4.60 0.24 0.01 2.00 0.10 0.04 5.10 6.00 1.06 4.70 36.20 0.67 7.50 383 29.90 K 1.07 0.93 0.95 0.92 0.55 0.78 0.84 0.80 0.69 0.67 0.95 1.01 0.74 0.95 0.50 0.88 0.81 CV 0.48 0.49 0.53 0.48 0.71 0.68 0.57 0.38 0.51 0.52 0.66 0.22 0.63 0.52 0.70 0.50 0.45 早侏罗世花岗闪长岩 X 0.38 0.06 7.70 0.41 0.01 2.10 0.13 0.09 8.20 9.40 1.84 36.80 57.10 0.91 7.90 553 62.70 S 0.19 0.03 5.00 0.27 0.00 1.30 0.08 0.03 3.70 4.60 1.30 36.20 31.30 0.62 4.90 359 26.70 K 0.93 0.86 0.83 0.77 0.35 0.54 0.65 0.68 0.56 0.55 1.09 1.72 0.73 0.66 0.37 0.63 0.77 CV 0.51 0.48 0.65 0.65 0.48 0.62 0.62 0.32 0.45 0.48 0.70 0.98 0.55 0.68 0.62 0.65 0.42 早侏罗世闪长岩 X 1.29 0.10 19.10 0.92 0.02 3.40 0.20 0.14 14.90 17.20 1.73 19.40 81.20 1.86 19.90 937 71.60 S 1.66 0.06 12.00 0.58 0.01 2.80 0.13 0.06 6.50 7.50 1.15 6.40 40.10 1.04 15.60 299 26.50 K 3.17 1.42 2.06 1.72 0.67 0.89 0.99 1.08 1.03 1.00 1.02 0.91 1.04 1.36 0.93 1.07 0.88 CV 1.29 0.59 0.63 0.63 0.79 0.83 0.65 0.44 0.44 0.44 0.67 0.33 0.49 0.56 0.78 0.32 0.37 晚三叠世二长花岗岩 X 0.31 0.05 4.70 0.36 0.01 2.00 0.11 0.07 4.40 6.30 1.71 18.80 14.90 0.68 4.40 402 30.60 S 0.10 0.02 2.80 0.25 0.01 1.50 0.11 0.03 3.00 4.50 1.36 3.50 11.40 0.43 2.70 177 14.70 K 0.77 0.69 0.51 0.66 0.39 0.52 0.57 0.54 0.30 0.37 1.01 0.88 0.19 0.50 0.21 0.46 0.38 CV 0.31 0.39 0.59 0.69 0.55 0.76 0.96 0.38 0.70 0.71 0.80 0.19 0.77 0.64 0.61 0.44 0.48 含量单位:Au为10-9,其余元素为10-6. X为平均值,S为标准离差,K为克拉克值,CV为变异系数. 表 2 研究区1 : 5万水系沉积物测量元素相关系数矩阵
Table 2. Correlation coefficient matrix of elements by 1:50 000 stream sediment survey in the study area
元素 Au Ag As Sb Hg Sn Bi Cd Co Cu Mo Pb V W Ni Mn Zn Au 1.00 Ag 0.05 1.00 As 0.12 0.04 1.00 Sb 0.09 0.18 0.30 1.00 Hg 0.02 0.04 0.01 0.07 1.00 Sn 0.01 0.07 0.02 0.02 0.36 1.00 Bi 0.02 0.01 0.07 0.06 0.21 0.13 1.00 Cd 0.01 0.02 0.13 0.11 0.33 0.33 0.17 1.00 Co -0.01 -0.01 0.10 0.00 0.16 0.36 0.00 0.58 1.00 Cu 0.01 0.00 0.08 0.02 0.28 0.42 0.10 0.60 0.82 1.00 Mo 0.01 0.03 0.08 0.03 0.01 0.07 0.03 0.28 0.26 0.28 1.00 Pb 0.01 0.00 0.13 0.07 0.18 0.10 0.19 0.34 0.18 0.17 0.13 1.00 V 0.00 -0.02 0.09 0.01 0.22 0.40 0.08 0.56 0.90 0.86 0.20 0.18 1.00 W 0.03 0.00 0.15 0.04 0.06 0.04 0.07 0.04 0.00 0.05 0.22 0.03 0.01 1.00 Ni -0.01 -0.01 0.02 -0.02 0.18 0.34 0.00 0.48 0.86 0.84 0.24 0.05 0.82 0.03 1.00 Mn -0.01 0 0.15 0.03 0.18 0.35 0.05 0.70 0.87 0.71 0.31 0.30 0.78 0.02 0.66 1.00 Zn 0 -0.02 0.01 0 0.18 0.22 0.08 0.36 0.34 0.38 0.12 0.14 0.38 0.01 0.32 0.35 1.00 表 3 研究区1:5万水系沉积物测量元素因子分析特征参数
Table 3. Characteristic parameters for factor analysis of elements by 1:50 000 stream sediment survey
因子 F1 F2 Au -0.0043 0.3048 Ag -0.0045 0.3218 As 0.0256 0.7508 Sb 0.0256 0.7508 Hg 0.359 0.0059 Sn 0.5268 0.0098 Bi 0.0674 0.0042 Cd 0.6443 0.0885 Co 0.9152 -0.0169 Cu 0.8819 -0.0162 Mo 0.2609 0.0895 Pb 0.2367 0.2279 V 0.9507 -0.0168 W -0.038 0.16 Ni 0.8812 -0.0189 Mn 0.7565 0.0861 Zn 0.4447 -0.0067 特征值 7.253 1.4399 累计方差贡献 30.0612 54.3453 表 4 研究区找矿远景区特征表
Table 4. Characteristics of metallogenic prospective areas
远景区名称 矿化异常 预测矿种 大土山-二道河子金及多金属找矿远景区 HS-8、HS-9、HS-10、HS-12、HS-14、HS-15、HS-18、HS-19、HS-20、HS-23 Au、Cu、Ni 腰垫子-下八道河子金银找矿远景区 HS-16、HS-21、HS-22、HS-24、HS-25 Au、Ag 表 5 HS-8综合异常参数特征
Table 5. Characteristics of HS-8 comprehensive anomaly parameters
元素 面积/km2 均值 峰值 衬度 规模 Sb 8.08 4.04 24.41 2.24 18.13 Au 6.03 4.04 11.16 2.89 17.41 W 3.45 6.25 15.39 1.84 6.34 Pb 2.24 42 74 1.31 2.94 Bi 0.39 2.11 2.11 5.02 1.94 Cu 1.55 33.7 45 1.2 1.87 Mo 0.52 9.19 27.23 2.3 1.19 As 0.84 42.6 61 1.09 0.91 含量单位:Au为10-9,其他元素为10-6. 表 6 HS-25综合异常参数特征
Table 6. Characteristics of HS-25 comprehensive anomaly parameters
元素 面积/km2 均值 峰值 衬度 规模 Ag 1.88 4 4 23.53 44.28 Au 8.27 2.36 12.53 1.68 13.92 Sb 5.95 3.47 16.62 1.93 11.47 W 2.09 4.71 8.61 1.38 2.89 As 3.38 27.5 54.6 0.71 2.38 Pb 0.76 51.1 88.5 1.6 1.21 Sr 0.75 509 616 1.11 0.83 含量单位:Au为10-9,其他元素为10-6. -
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