Geochemical Characteristics and Ore−prospecting of Dashagou Area in East Kunlun, Xinjiang: Based on Stream Sediment Survey
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摘要:
在1∶5万水系沉积物测量基础上，对东昆仑大沙沟一带成矿元素分布特征进行研究，获得了较为丰富的区域地球化学成果。通过对元素分布特征、元素相关性、地球化学参数特征等进行研究。结果表明，该区元素的富集与地层、构造、岩浆岩明显相关；Cu、Zn、Au、Ag、Sb、Hg富集成矿可能性较大，可作为区内主成矿元素及指示元素。本次工作共圈定37处综合异常，6处成矿远景区，5处找矿靶区，为下一步找矿工作提供了地球化学依据。
Abstract:Based on the 1∶50000 stream sediment survey, the distribution characteristics of ore-forming elements in Dashagou area, East Kunlun, and plentiful regional geochemical survey data was obtained. The author analyzed the characteristic of element distribution, geochemical features of stream sediment as well as the relationships between of elements, and found that the enrichment and depletion of elements relate to the formation, struture and magmatic rock, Cu, Zn, Au, Ag, Sb, Hg are more likely to be rich in integrated ore, which can be used as the main ore–forming element and indicator element in the area. A total of 37 composite anomalies and 6 potential ore–prospecting areas and 5 target area were delineated in this work, the results points out the direction for the prospecting work in the next stage.
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Key words:
- stream sediment survey /
- geochemical characteristics /
- prospective area /
- Dashagou area /
- east Kunlun
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表 1 研究区各地质单元异常下限统计表
Table 1. The threshold of anomaly of each geological unit in the study area
元素 北部 南部 元素 北部 南部 Ag 0.09 0.14 Hg 0.11 0.13 As 29.79 35.31 Li 49.58 55.2 Au 2 3.47 Mo 1.31 1.86 B 142.45 118.73 Ni 40.7 49.79 Be 1.94 2.35 Pb 24.52 29.02 Bi 0.27 0.38 Sb 3.7 7.18 Co 13.74 18.38 Sn 2.03 4.21 Cr 75.83 86.68 W 2.02 2.11 Cu 30.37 48.3 Zn 76.52 97.38 注：Au、Ag、Hg含量为10−9，其他元素含量为10−6。 
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表 2 元素特征值参数统计表
Table 2. Element eigenvalue parameter statistics table
北 部 南 部 元素 平均值（X1） 背景值（X2） 富集系数（K） 成矿有利度（Ma） 区域背景值 元素 平均值（X1） 背景值（X2） 富集系数（K） 成矿有利度（Ma） 区域背景值 Ag 0.04 0.04 0.74 0.33 0.058 Ag 0.10 0.09 1.52 0.64 0.06 As 15.14 14.75 1.12 0.26 13.163 As 18.95 16.48 0.90 0.26 18.37 Au 0.94 0.89 0.71 0.31 1.259 Au 2.01 1.67 1.34 0.69 1.25 B 59.08 45.49 1.43 1.00 31.746 B 77.73 75.72 1.90 0.69 39.77 Be 1.24 1.23 0.85 0.30 1.442 Be 1.88 1.88 1.04 0.29 1.8 Bi 0.17 0.16 0.80 0.28 0.207 Bi 0.29 0.28 1.12 0.39 0.25 Co 8.37 8.27 0.95 0.35 8.667 Co 14.01 13.92 1.25 0.31 11.15 Cr 39.49 37.66 0.78 0.40 48.502 Cr 65.07 64.06 1.41 0.40 45.54 Cu 20.26 19.90 0.99 0.33 20.112 Cu 44.55 43.91 1.53 0.58 28.71 Hg 0.05 0.04 1.10 0.59 0.036 Hg 0.09 0.07 0.00 0.00 40 Li 36.31 29.88 1.22 0.33 24.407 Li 45.31 44.82 1.26 0.32 35.66 Mo 0.81 0.76 0.85 0.26 0.897 Mo 1.39 1.27 1.64 0.79 0.77 Ni 23.64 21.96 0.95 0.32 23.169 Ni 42.01 41.04 1.53 0.42 26.77 Pb 16.22 14.01 0.82 0.23 17.016 Pb 20.05 19.60 1.06 0.33 18.43 Sb 1.45 1.37 1.23 0.32 1.112 Sb 3.57 2.60 2.03 1.06 1.28 Sn 0.92 0.75 0.37 0.23 2.038 Sn 2.68 2.60 1.31 0.52 1.99 W 1.18 1.06 0.88 0.36 1.208 W 1.62 1.53 1.24 0.34 1.24 Zn 49.54 48.41 1.01 0.37 48.009 Zn 89.96 89.61 1.13 0.32 79.51 注：Au、Ag、Hg含量为10−9，其他元素单位为10−6。
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表 3 研究区变异系数及标准离差统计表
Table 3. Variable coefficient and standard deviationstatistical table in the study area
元素 北 部 南 部 Cv1 Cv2 Cv1/Cv2 S1 S2 S1/S2 Cv1 Cv2 Cv1/Cv2 S1 S2 S1/S2 Ag 0.56 0.45 1.24 0.02 0.02 1.29 0.68 0.42 1.60 0.07 0.04 1.76 As 0.63 0.23 2.72 9.52 3.42 2.79 0.59 0.29 2.02 11.26 4.83 2.33 Au 0.62 0.44 1.40 0.58 0.40 1.47 5.18 0.52 10.02 10.42 0.86 12.06 B 1.11 0.70 1.58 65.35 31.86 2.05 0.40 0.36 1.12 31.31 27.27 1.15 Be 0.36 0.35 1.04 0.45 0.43 1.05 0.29 0.28 1.04 0.55 0.52 1.05 Bi 0.36 0.35 1.02 0.06 0.06 1.03 0.42 0.35 1.23 0.12 0.10 1.26 Co 0.39 0.37 1.07 3.28 3.04 1.08 0.28 0.25 1.12 3.94 3.50 1.12 Cr 0.60 0.51 1.17 23.54 19.25 1.22 0.42 0.28 1.47 27.27 18.23 1.50 Cu 0.37 0.34 1.09 7.42 6.71 1.10 0.40 0.38 1.07 17.92 16.54 1.08 Hg 1.19 0.54 2.22 0.06 0.02 2.90 2.78 0.58 4.80 0.25 0.04 6.38 Li 1.24 0.27 4.68 45.16 7.95 5.68 0.28 0.26 1.11 12.85 11.43 1.12 Mo 0.50 0.30 1.66 0.40 0.23 1.76 0.82 0.48 1.71 1.14 0.60 1.88 Ni 0.55 0.34 1.61 13.02 7.52 1.73 0.47 0.27 1.72 19.67 11.19 1.76 Pb 2.10 0.28 7.51 34.00 3.91 8.69 0.36 0.31 1.16 7.18 6.05 1.19 Sb 0.95 0.26 3.68 1.38 0.35 3.90 1.23 0.52 2.36 4.38 1.35 3.23 Sn 0.93 0.61 1.51 0.85 0.46 1.84 0.46 0.40 1.16 1.23 1.03 1.20 W 0.62 0.40 1.53 0.73 0.43 1.69 0.75 0.27 2.73 1.21 0.42 2.88 Zn 0.40 0.36 1.09 19.71 17.61 1.12 0.29 0.28 1.02 26.08 25.47 1.02
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表 4 旋转因子矩阵数据表
Table 4. Rotation factor matrix data table
变量 F1 F2 F3 F4 F5 F6 F7 F8 F9 Au 0.014 −0.034 0.018 −0.003 −0.011 0.999 0 −0.01 −0.025 Sn 0.149 −0.213 0.047 −0.055 −0.706 0.01 −0.02 −0.073 −0.489 Ag 0.044 −0.785 0.068 −0.001 −0.425 0.009 0.017 −0.053 −0.109 Cu 0.307 −0.599 0.197 −0.1 −0.046 0.029 0.086 0.035 −0.586 Pb 0.021 −0.077 −0.036 −0.87 −0.016 0.002 −0.046 −0.115 −0.075 Zn 0.379 −0.234 0.124 −0.168 −0.183 0.014 0.053 −0.029 −0.758 Ni 0.889 −0.19 0.098 −0.066 −0.126 0.011 0.025 −0.03 −0.3 W 0.068 −0.054 0.161 −0.043 −0.089 0.011 0.011 −0.909 −0.234 Mo 0.105 −0.888 0.145 −0.05 0.079 0.028 0.105 −0.044 −0.154 Cr 0.866 −0.02 0.041 −0.085 −0.176 0.008 0.011 −0.074 −0.396 Co 0.578 −0.16 0.167 −0.115 −0.162 0.011 0.065 −0.043 −0.687 Li 0.124 0.011 0.166 −0.78 −0.097 0.003 0.069 0.076 −0.196 Be 0.302 −0.076 0.121 −0.14 −0.215 0.012 0.001 −0.13 −0.828 B 0.172 −0.042 0.053 −0.081 −0.875 0.005 0.029 −0.051 −0.145 Ass 0.105 −0.141 0.794 −0.056 −0.012 0.004 −0.017 −0.283 −0.085 Sb 0.047 −0.108 0.827 −0.067 −0.078 0.018 0.024 0.06 −0.264 Bi 0.134 −0.099 0.202 −0.103 −0.144 0.015 −0.028 −0.26 −0.794 Hg 0.035 −0.114 0.004 −0.014 −0.015 0 0.988 −0.007 −0.028
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