APPLICATION OF GEOCHEMICAL PROSPECTING TO THE JIJIAWA GOLD DEPOSIT AND ITS ADJACENT REGIONS IN HENAN PROVINCE
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摘要: 吉家洼金矿是华北陆块南缘熊耳山金矿田的一个小型矿床, 金矿体赋存于含矿断裂带内, 并严格受其控制, 矿体的形态、产状与含矿断裂基本一致。通过对矿区外围F1、F7断裂带开展系统的岩石地球化学测量, 圈定了多个受断裂控制的高强度Au异常, 经钻探施工, 见矿情况良好。进一步对钻孔进行了岩石原生晕采样化验和统计分析, 结果显示矿体向下有一定的延深, 经钻探施工, 在断裂深部发现工业矿体, 矿床规模扩大至中型。吉家洼矿区外围含矿断裂带数量多、矿化强度高, 而地表Au前缘元素非常发育, 向深部矿体头部元素及矿体元素发育并伴有前缘指示元素, 矿尾元素不发育, 已发现的矿体深部不封闭, 说明矿体沿倾向具有长距离延深, 深部找矿前景好。Abstract: The Jijiawa gold deposit in Henan Province, located at the southern margin of North China Craton, is a small-scale deposit in the Xiongershan goldfield. Gold ore bodies are hosted within and have consistent attitudes with the NNE and/or SN trending fault fracture zones, which in turn strictly controlled the shapes and occurrences of the ore bodies. A systematic whole-rock geochemical survey on fracture zones F1 and F7 in the adjacent region of the deposit is carried out, and several high strength Au anomalies controlled by the fractures have been confirmed. After drilling construction, gold ore bodies have been discovered. The statistical analysis on the primary halos of the drilling cores further indicates that the ore bodies extend downwards in some degree. The drilling construction also reveals gold ore bodies in depth developing along the fractures. In terms of calculation on resource reserve, the discovered deposit is medium-sized in scale. There are lots of mineralizing fractures in the adjacent regions of the Jijiawa deposit, in which the primary halos have following characteristics. The front-halo elements are well-developed, but rear-halo elements aren't. Moreover, the front-halo elements, main ore-forming halos and rear halo elements are developed at depth. As a result, the new discovered gold ore bodies extend at depth. We thus suggest that there are good ore prospects in the adjacent regions of the deposit.
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图 1 河南省洛宁县南部地质矿产略图
1—新太古代太华群；2—中元古代熊耳群；3—古近系；4—张性正断层；5—压性逆断层；6—张扭性平推断层；7—倾伏背形构造轴部箭头指向倾伏端；8—倾伏向形构造槽部箭头指向扬起端；9—倒转倾伏背形构造；10—角度不整合；11—太华群岩组界线；12—新生界断陷盆地；13—燕山期花岗岩；14—金矿床；15—断裂及编号；16—研究区范围
Figure 1. Schematic map showing geology and mineral resources in South Luoning County, Henan Province
图 2 吉家洼金矿区及外围地质略图
1—第四系；2—中元古代熊耳群许山组；3—龙潭沟岩组；4—龙门店岩组；5—太华岩群石板沟岩组；6—辉绿玢岩脉；7—断裂位置、编号及产状；8—不整合、整合地质界线；9—地层产状；10—脉岩产状
Figure 2. Schematic geological map showing the Jijiawa gold depositand its adjacent region
图 3 吉家洼金矿外围构造纲要图
Figure 3. Structure outline map showing the adjacent region of Jijiawa gold deposit
图 6 第108勘探线剖面图
1—断裂带编号；2—坑道及编号；3—钻孔编号；4—样品编号品位/10-6厚度/m；5—矿体及编号；6—辉绿岩；7—太华岩群黑云斜长片麻岩；8—太华岩群角闪斜长片麻岩
Figure 6. The profile map of 108 prospecting line
表 1 主要含矿断裂特征
Table 1. Characteristics of the main ore-bearing faults
断层编号 规模/m 产状/(°) 结构面及岩性特征 力学性质 矿化蚀变 长度 宽度 走向 倾向 倾角 F1 ＞3320 0.16~30.00 341~50 东 50~89 镜面光滑，具分枝复合，发育碎裂岩、角砾岩、石英脉、断层泥砾岩 张-压-扭 硅化、黄铁矿化、褐铁矿化、方铅矿化、绢云母化、方解石化、孔雀石化，金矿化强，圈出两个金矿体 F2 650 0.30~1.60 350~40 西—北西多处出现反倾 56~89 镜面平直光滑，发育碎裂岩、角砾岩、石英脉、断层泥砾岩 张-压-扭 西—北西，多处出现反倾，金矿化弱，局部有小规模民采痕迹 F3 442 0.50~1.00 351~33 北西西—南西西 60~81 镜面光滑，发育碎裂岩、角砾岩、石英脉 压-扭 硅化、褐铁矿化、黄铁矿化、绢云母化、钾长石化，金矿化弱，局部有民采痕迹 F5 1100 1.00~5.00 10~35 北西 55~85 具劈理化带，发育碎裂岩、角砾岩、碎粒岩、断层泥砾岩 张-压-扭 黄铁矿化、方铅矿化、黄铜矿化，金矿化较强，地表及浅部已采空 F7 1720 0.10~2.10 18~64 北西 54~89 结构面呈舒缓波状，似斜擦痕、水平擦痕发育，具分枝复合，发育碎裂岩、角砾岩、石英脉 张-压-扭 硅化、黄铁矿化、褐铁矿化、方铅矿化、绢云母化、碳酸盐化，金矿化较强，圈出两个金矿体 F34 263 0.10~0.60 60~87 北北西 64~84 发育碎裂岩、角砾岩、石英脉 张-扭 绢云母化、硅化、褐铁矿化，金矿化较强，有小规模民采 F35 360 0.18~0.55 50~78 北北西 66~83 发育碎裂岩、石英脉 张-扭 硅化、褐铁矿化、绢云母化金矿化较强，有小规模民采 F36 194 0.03~1.00 55~80 北北西 60~89 发育碎裂岩、石英脉 张-扭 F44 434 0.10~0.80 1~35 南东东 72~88 顶底板呈锯齿状，发育碎裂岩、石英脉 张-扭 F60 490 0.18~0.45 11~37 南东 65~89 镜面平直光滑，发育碎裂岩 压-扭 硅化、褐铁矿化，金矿化不均匀，地表有采空区 
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表 2 矿体特征
Table 2. Characteristics of the ore bodies
含矿断裂带编号 矿体编号 标高/m 产状 规模 品位/10-6 资源储量 倾向/(°) 倾角/(°) 长度/m 矿体厚度/m 斜深/m 变化范围 平均 矿石量/t 金属量/kg 变化范围 平均 变化范围 平均 变化范围 平均 F1 F1-Ⅰ 843~1080 71~94 85 50~86 69 10166 0.19~5.15 1.77 235 0.54~34.02 8.63 313011 2700.90 F1-Ⅱ 832~1089 87~128 105 56~89 64 530 0.45~3.30 1.37 316 1.08~9.86 5.02 238376 1197.33 F7 F7-Ⅰ 834~1048 288~334 305 77~89 80 565 0.20~1.01 0.52 182 0.16~147.0 8.90 46231 411.41 F7-Ⅱ 908~956 303~314 305 54~87 80 122 0.25~0.78 0.43 57 1.27~17.00 3.42 6579 22.60
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表 3 样品分析精度
Table 3. Sample analysis accuracy
元素 检出限/10-6 Au 0.0003~0.03 Ag 0.05~50.00 As 0.5 Sb 0.3 Bi 0.3 Cu 2 Pb 10 Zn 10 Mo 1 W 1 Ba 100 Mn 100
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表 4 地表微量元素特征
Table 4. Trace elements characteristics of surface
岩石类型 Au/10-9 Ba/10-6 Mn/10-6 Cu/10-6 Pb/10-6 Zn/10-6 Ag/10-6 W/10-6 Mo/10-6 As/10-6 Sb/10-6 Bi/10-6 围岩 19.93 1162 1005 24.21 29.505 103.38 0.19 2.615 2.92 2.90 0.42 0.74 含矿断裂带岩石 218.07 1138 1220 299.19 893.980 668.34 11.65 2.715 2.61 260.82 2.24 0.98
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表 5 元素地球化学特征值
Table 5. List of elements geochemical eigenvalues
特征值名称 Au/10-9 Ba/10-6 Mn/10-6 Cu/10-6 Pb/10-6 Zn/10-6 Ag/10-6 W/10-6 Mo/10-6 As/10-6 Sb/10-6 Bi/10-6 均值 20.82 1157.00 1003.00 24.26 29.08 96.59 0.15 2.64 2.92 2.86 0.42 0.63 标准离差 14.00 639.00 577.00 16.09 12.06 53.87 0.11 0.71 0.81 0.99 0.09 0.26 变化系数 0.67 0.55 0.58 0.66 0.41 0.56 0.72 0.27 0.28 0.35 0.21 0.41 异常下限 50.00 2500.00 2000.00 60.00 60.00 200.00 0.30 4.00 4.50 4.50 0.60 1.20
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表 6 深部钻孔微量元素统计结果
Table 6. Statistical results of trace elements in deep borehole
岩石类型 Au/10-9 Ba/10-6 Mn/10-6 Cu/10-6 Pb/10-6 Zn/10-6 Ag/10-6 W/10-6 Mo/10-6 As/10-6 Sb/10-6 Bi/10-6 围岩 13.28 1273.72 1017.98 66.55 47.69 161.49 0.77 3.09 2.64 4.60 0.51 0.59 含矿断裂带 228.75 743.75 1168.75 52.75 275.75 418.75 2.11 2.02 3.46 40.16 0.69 0.76
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