GEOCHEMICAL ANOMALIES AND METALLOGENIC PROSPECT IN CHAHAXILI AREA OF DULAN COUNTY, QINGHAI PROVINCE
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摘要:
通过1：5万水系沉积物的地球化学测量，对查哈西里地区Au、Cu等16种元素的地球化学特征进行了初步分析.综合元素富集程度、分异程度、叠加强度，发现Au、Cu、Ni、Cr、Co在研究区内有富集成矿的可能，是研究区主要成矿元素.根据异常特征与成矿地质条件，推断区内为构造蚀变岩型Au-Cu多金属矿床及热液蚀变型Cu-Ni多金属矿床.优选出4处成矿远景区，即科德日特-巴嘎哈尔散金铜多金属成矿远景区、查干热格沟铜多金属成矿远景区、乌兰可镍多金属成矿远景区和马尼特沟南铁镍多金属成矿远景区.
Abstract:Through the 1:50 000 geochemical survey of stream sediments in Chahaxili area, the paper analyzes the geochemical characteristics of 16 elements such as Au and Cu. Combined with the enrichment, differentiation, and superposition degree of elements, it is found that Au, Cu, Ni, Cr and Co have the possibility of enrichment and mineralization, and serve as the main ore-forming elements in the study area. Based on the anomaly characteristics and metallogenic geological conditions, it is inferred that there are structural altered rock type Au-Cu polymetallic deposits and hydrothermal alteration type Cu-Ni polymetallic deposits in the area. Four metallogenic prospective areas are optimized, including Kederite-Bagahaersan Au-Cu polymetallic prospective area, Chaganregegou Cu polymetallic prospective area, Wulanke Ni polymetallic prospective area and Manitegounan Fe-Ni polymetallic prospective area.
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表 1 查哈西里地区元素异常下限统计
Table 1. Statistics of element anomaly threshold in Chahaxili area
元素 理论计算值 实际使用值 元素 理论计算值 实际使用值 Au 3.37 3 Ti 4702.16 3800 As 30.16 25 Pb 29.66 25 Sb 2.93 4.5 Zn 115.05 95 Hg 67.55 45 Ag 82.73 70 Cu 47.93 41 W 2.40 2 Ni 57.97 47 Sn 4.18 3.45 Co 21.63 17 Bi 0.52 0.45 Cr 111.78 90 Mo 1.07 0.90 异常值单位：Au、Ag、Hg为10－9；其他元素为10－6. 
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表 2 查哈西里地区元素分布及富集特征参数统计
Table 2. Statistics of element distribution and enrichment characteristic parameters in Chahaxili area
元素 均值 标准方差 东昆仑平均值* 富集系数 变化系数 叠加系数 Ag 61.93 58.14 51 1.21 0.94 4.98 As 16.18 15.34 12.3 1.32 0.95 2.20 Au 2.97 28.92 1.61 1.84 9.74 60.94 Bi 0.33 0.33 0.33 1.00 1.00 3.27 Co 14.53 17.63 9.55 1.52 1.21 4.62 Cr 77.41 70.67 48.7 1.59 0.91 3.59 Cu 45.81 412.73 20.2 2.27 9.01 68.61 Hg 31.42 93.91 20 1.57 2.99 8.26 Mo 0.7 0.63 0.8 0.88 0.90 3.25 Ni 39.3 50.97 22.7 1.73 1.30 4.85 Pb 19.65 9.46 18.7 1.05 0.48 1.85 Sb 2.58 3.23 0.96 2.69 1.25 7.85 Sn 2.68 0.89 2.36 1.14 0.33 1.17 Ti 2932.53 959.87 3040 0.96 0.33 1.08 W 1.54 0.92 1.9 0.81 0.60 2.04 Zn 72.15 54.61 58.3 1.24 0.76 2.51 *东昆仑元素平均值据《青海省东昆仑地球化学说明书（1∶ 500000）》.含量单位：Au、Ag、Hg为10－9，其他为10－6.
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表 3 查哈西里地区元素分布类型统计
Table 3. Statistics of element distribution types in Chahaxili area
参数 范围 等级划分 研究区化学元素 Cv ＜0.7 均匀型 Pb、Sn、Ti、W [0.7，1.0） 分异型 Ag、As、Cr、Mo、Zn ≥1.0 强分异型 Au、Bi、Co、Cu、Hg、Ni、Sb K ＜0.8 贫化型 [0.8，1.2） 背景型 Bi、Mo、Pb、Sn、Ti、W ≥1.2 富集型 Ag、As、Au、Co、Cr、Cu、Hg、Ni、Sb、Zn D ＜1.5 同生型 Sn、Ti [1.5，3.5） 改造型 As、Bi、Mo、Pb、W、Zn [3.5，7.0） 叠加型 Ag、Co、Cr、Ni [7.0，14.0） 强叠加型 Hg、Sb ≥14.0 极强叠加型 Au、Cu
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表 4 HS7综合异常特征
Table 4. Characteristics of HS7 integrated anomaly
元素 异常下限 异常点数 面积/km2 最大值 平均值 标准离差 变化系数 衬度 规模 Ag 70.00 45 6.82 280.00 99.11 35.00 0.35 1.42 9.66 As 25.00 7 0.92 43.30 32.30 6.92 0.21 1.29 1.19 Au 3.00 43 7.26 75.00 11.26 13.20 1.17 3.75 27.25 Bi 0.45 53 9.35 7.51 1.76 1.72 0.98 3.91 36.57 Co 17.00 18 2.41 28.40 21.48 2.78 0.13 1.26 3.05 Cr 90.00 17 2.02 242.00 117.19 33.93 0.29 1.30 2.63 Cu 41.00 40 7.06 132.00 68.49 18.84 0.28 1.67 11.79 Mo 0.90 42 7.03 5.94 2.04 1.29 0.63 2.27 15.93 Ni 47.00 19 1.90 76.90 58.05 9.05 0.16 1.24 2.35 Pb 25.00 2 0.66 115.00 83.6 31.4 0.38 3.34 2.21 Sn 3.45 4 0.62 4.32 4.06 0.25 0.06 1.18 0.73 W 2.00 60 9.96 16.00 5.44 3.26 0.60 2.72 27.09 异常值单位: Au、Ag为10-9; 其他元素为10-6.
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表 5 HS14综合异常特征
Table 5. Characteristics of HS14 integrated anomaly
元素 异常下限 异常点数 面积/km2 最大值 平均值 标准离差 变化系数 衬度 规模 Ag 70.00 8 2.78 1890.00 926.25 773.37 0.83 13.23 36.79 As 25.00 7 0.92 69.40 41.77 17.44 0.42 1.67 1.54 Au 3.00 14 2.60 99.90 26.82 34.13 1.27 8.94 23.24 Bi 0.45 6 1.98 2.54 1.67 0.72 0.43 3.71 7.35 Co 17.00 23 4.30 568.00 126.29 181.68 1.44 7.43 31.94 Cr 90.00 25 4.35 507.00 164.30 88.70 0.54 1.83 7.94 Cu 41.00 23 3.87 14902.00 2585.04 4630.31 1.79 63.05 244.00 Hg 45.00 23 2.19 575.00 108.05 167.01 1.55 2.40 5.26 Mo 0.90 7 2.42 18.40 10.99 7.51 0.68 12.21 29.55 Ni 47.00 21 3.74 332.00 96.18 55.31 0.58 2.05 7.65 Pb 25.00 6 1.07 133.00 73.92 42.94 0.58 2.96 3.16 Sn 3.45 8 1.28 8.97 5.11 1.89 0.37 1.48 1.90 W 2.00 9 1.28 3.66 2.78 0.44 0.16 1.39 1.78 Zn 95.00 12 2.74 1850.00 624.09 629.45 1.01 6.57 18.00 Sb 4.50 2 0.17 6.26 6.15 0.10 0.02 1.37 0.23 异常值单位: Au、Ag、Hg为10-9; 其他元素为10-6.
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表 6 HS18综合异常特征
Table 6. Characteristics of HS18 integrated anomaly
元素 异常下限 异常点数 面积/km2 最大值 平均值 标准离差 变化系数 衬度 规模 As 25.00 16 3.58 116.00 58.32 29.63 0.51 2.33 8.35 Bi 0.45 6 1.22 1.07 0.67 0.26 0.39 1.49 1.82 Co 17.00 2 0.75 41.80 39.60 2.20 0.06 2.33 1.75 Cr 90.00 3 1.02 812.00 533.13 342.71 0.64 5.92 6.04 Hg 45.00 5 0.97 93.8 73.6 15.73 0.21 1.64 1.59 Mo 0.90 5 0.36 1.20 1.02 0.10 0.10 1.13 0.41 Ni 47.00 10 2.51 691.00 176.14 241.03 1.37 3.75 9.41 Sn 3.45 5 0.67 6.33 4.25 1.06 0.25 1.23 0.83 W 2.00 5 0.72 2.74 2.46 0.27 0.11 1.23 0.89 Sb 4.50 8 2.19 12.60 9.15 2.28 0.25 2.03 4.45 异常值单位: : Hg为10-9；其他元素为10-6.
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表 7 HS29综合异常特征
Table 7. Characteristics of HS29 integrated anomaly
元素 异常下限 异常点数 面积/km2 最大值 平均值 标准离差 变化系数 衬度 规模 As 25.00 40 5.26 48.70 35.91 5.87 0.16 1.44 7.56 Au 3.00 31 3.24 5.25 3.50 0.60 0.17 1.17 3.78 Co 17.00 76 12.66 65.80 27.32 11.17 0.41 1.61 20.35 Cr 90.00 92 15.48 1154.00 236.94 206.17 0.87 2.63 40.75 Cu 41.00 26 3.97 63.90 46.77 5.97 0.13 1.14 4.53 Hg 45.00 63 9.19 1491 135.79 226.54 1.67 3.02 27.73 Mo 0.90 40 4.95 1.41 1.05 0.13 0.12 1.17 5.78 Ni 47.00 94 17.08 992.00 172.85 199.31 1.15 3.68 62.81 Sn 3.45 40 5.76 5.69 4.33 0.63 0.15 1.26 7.23 W 2.00 40 5.78 3.10 2.35 0.23 0.10 1.18 6.79 Zn 95.00 37 4.29 114.00 101.65 5.23 0.05 1.07 4.59 Sb 4.50 47 6.47 12.90 8.26 2.3 0.28 1.84 11.88 异常值单位: : Au、Hg为10-9; 其他元素为10-6.
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