GEOCHEMICAL CHARACTERISTICS AND PROSPECTING POTENTIAL OF WEIYUANGOU GOLDFIELD IN LUSHI COUNTY, HENAN PROVINCE
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摘要:
河南卢氏苇园沟金矿区位于华北陆块南缘北秦岭多金属成矿带, 出露地层主要为宽坪岩群, 瓦穴子断层及其次级断裂横贯矿区, 是该区主要控矿构造, 区内变质变形作用强烈. 在矿区地质特征、矿区地球化学特征研究的基础上, 通过元素相关性分析、地球化学元素分布与构造展布研究, 发现异常和金矿(化)体与构造在空间上对应关系较好, 异常范围有一定位移; 宽坪岩群有利于成矿, 对岩性具一定选择性. 根据元素组合特征判断矿床总体剥蚀较浅. 综合认为研究区Au元素单一富集, 主成矿元素Au与其他元素相关性较低; Au元素异常主要围绕断裂带分布, 金矿(化)体展布严格受构造控制, 研究区具较大可能形成单一元素金矿床.
Abstract:Weiyuangou goldfield of Lushi County, Henan Province, is located in the North Qinling polymetallic metallogenic belt on the southern margin of North China Block, where Kuanping rock group is dominantly exposed. Waxuezi fault and its secondary faults crossing the orefield are the main ore-controlling structures in the area, with strong metamorphism and deformation. Based on the geological and geochemical characteristics of the area, through the element correlation analysis, geochemical element distribution and structural distribution, it is found that the anomalies and gold ore/mineralized bodies are well corresponded to the structure in space, but the anomaly range has a certain displacement. The Kuanping rock group is favorable to mineralization, with certain lithological selectivity. It is considered that the overall denudation of the deposit is shallow according to the element combination characteristics. From above, it is concluded that there is a single enrichment of Au in the area, and the correlation between the main ore-forming element Au and other elements is low. The Au anomalies are mainly distributed around the fault zone. The distribution of gold ore/mineralized body is strictly controlled by structure. Single element gold deposits are possibly formed in the study area.
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Key words:
- gold deposit /
- geochemistry /
- metallogenic regularity /
- prospecting indicator /
- Kuanping rock group /
- Henan Province
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表 1 矿石光谱全分析结果表
Table 1. Full spectrum analysis results of ore
样品号 Cu Pb Zn Ag W Mo Bi Sn Ni Co Mn Ba Cr V Ti Sb As K2-H1 38.1 668 36.3 5.67 1.56 15.6 9.69 17.0 27.3 35.2 686 848 46.6 75.1 1569 25.0 59.2 含量单位: 10-6. 
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表 2 苇园沟金矿区单元素地球化学特征
Table 2. Geochemical characteristics of single element in Weiyuangou goldfield
元素 富集性 分异性 极大值 分布特征 Au 强 极强 159.2 带状，与区域断裂方向一致 Ag 强 分异 1.711 带状，北东或近东西向分布 As 强 极强 1 069.0 浓集中心分散，面状分布 Sb 强 弱 17.98 浓集中心分散，面状分布 Cu 强 弱 194.0 浓集中心分散，带状分布 Pb 强 分异 616.0 带状，北东或近东西向分布 Zn 富集 不均匀 728.0 带状，北东向分布 W 富集 不均匀 8.3 浓集中心分散 Mo 强 不均匀 3.97 不规则带状，浓集中心分散 V 富集 不均匀 342.0 不规则带状，近东西向分布 Mn 富集 弱 9 668 不规则带状，浓集中心分散 异常元素单位: Au为10-9, 其他元素为10-6.
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表 3 苇园沟金矿区旋转后的成分矩阵
Table 3. Rotated component matrix of Weiyuangou goldfield
元素 f1 f2 f3 Au 0.738 Ag 0.505 As 0.814 Sb 0.705 Cu 0.894 Pb 0.590 0.554 Zn 0.522 0.580 W 0.786 Mo 0.672 0.531 V 0.920 Mn 0.583
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表 4 苇园沟金矿区主因子方差贡献值
Table 4. Variance contribution values of principal factors in Weiyuangou goldfield
主因子 f1 f2 f3 特征值 2.806 2.539 1.891 方差贡献/% 25.513 23.085 17.194 累计方差/% 25.513 48.598 65.792
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表 5 苇园沟金矿区各元素异常下限特征值表
Table 5. Anomaly threshold eigenvalues of each element in Weiyuangou goldfield
元素 Au Ag As Sb Cu Pb Zn W Mo V Mn 苇园沟金矿区极大值 159.2 1.711 1069.00 17.98 194.0 616.0 728.0 8.29 3.97 342.0 9668 苇园沟金矿区算术平均值 2.5 0.121 12.3 1.30 41.8 40.6 104.0 1.39 1.27 111.7 1073 苇园沟金矿区原始数据（X+2S0） 4.55 0.219 20.90 2.41 86.2 73.6 160.7 2.38 2.10 201.1 1965 苇园沟金矿区反对数（X+2S0） 6.48 0.237 25.90 2.60 106.3 88.1 171.3 2.73 2.37 228.6 2244 苇园沟金矿区累频（92%） 4.50 0.209 18.93 2.17 75.3 65.1 142.0 2.11 1.84 179.0 1752.9 六里坪-小沟河岩片异常下限（T）❶ 3.0 0.2 15.0 1.50 60.0 60.0 160.0 4.00 2.0 160.0 1500 1∶ 5万龙驹街幅异常下限（T）❶ 5.0 0.2 20.0 2.0 60.0 60.0 160.0 4.00 2.0 150.0 1500 卢氏地区宽坪岩群算术平均值❶ 8.82 0.1 5.48 0.62 42.7 35.4 106 2.75 1.05 105.8 818.6 苇园沟金矿区异常下限（T） 4.5 0.21 20.0 2.3 80.0 60.0 160.0 2.50 2.0 180.0 1800 异常元素单位: Au为10-9, 其他元素为10-6.
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表 6 苇园沟金矿区Au元素异常特征值表
Table 6. Anomaly eigenvalues of Au in Weiyuangou goldfield
异常编号 面积/km2 极大值 异常点数 异常平均值 异常衬度 异常规模/km2 异常形态 1-Ⅰ 0.0055 23.9 4 10.3 2.289 0.0126 带状 2-Ⅲ 0.0032 6.6 2 5.7 1.267 0.0041 近圆形 3-Ⅰ 0.0031 159.2 2 83.6 18.58 0.0576 条带状 4-Ⅲ 0.0047 6.4 2 5.9 1.311 0.0062 近圆形 5-Ⅰ 0.1017 93.9 33 12.7 2.822 0.2870 带状 6-Ⅰ 0.0282 87.1 11 23.1 5.133 0.1448 带状 7-Ⅱ 0.0042 12.8 2 9.2 2.044 0.0086 带状 8-Ⅱ 0.0041 10.8 5 6.0 1.333 0.0055 椭圆形 9-Ⅱ 0.0402 13.6 14 6.1 1.356 0.0545 带状 10-Ⅰ 0.0540 24.5 17 7.8 1.733 0.0936 条带状 11-Ⅱ 0.0267 10.0 7 6.4 1.422 0.0380 条带状 12-Ⅰ 0.0172 17.0 6 9.9 2.200 0.0378 条带状 13-Ⅲ 0.0115 5.9 5 5.2 1.156 0.0133 条带状 14-Ⅲ 0.0135 7.1 4 5.6 1.244 0.0168 条带状 15-Ⅲ 0.0028 9.7 1 9.7 2.156 0.0060 椭圆形 16-Ⅰ 0.0012 18.1 1 18.1 4.022 0.0048 椭圆形 17-Ⅱ 0.0023 13.9 1 13.9 3.089 0.0071 椭圆形 18-Ⅰ 0.0010 37.1 1 37.1 8.244 0.0082 椭圆形 含量单位: 10-9.
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