THE GEOLOGICAL FEATURES AND ORE-CONTROLLING FACTORS OF THE LIUSHUPING GOLD AND ZINC ORE DEPOSITS IN LUEYANG, SHAANXI PROVINCE
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摘要: 陕西略阳柳树坪金锌矿床是"勉-略-宁"三角地带碳酸盐岩型矿床，通过野外调查与地质资料分析，对该矿床的地质特征、主要控矿地质因素、成矿条件等进行了研究。研究结果表明，柳树坪矿区成矿与地层、构造、岩浆岩等多重因素有关，其中震旦系断头崖组、九道拐组碳酸盐岩富含金、铅、锌等金属矿产，是该矿床的主要矿源层；印支—燕山期形成的沿九道拐向斜南北翼发育的构造破碎带基本控制了区内矿体的空间展布；同时燕山期中酸性浅成小岩体对金、锌、铅等元素活化、富集作用较强，为重要的控矿因素。综合分析认为柳树坪矿床为沉积层控-构造热液改造型金锌矿床，具有较好的金、锌等多金属矿产资源潜力。Abstract: The Liushuping gold and zinc ore deposits, located in Lueyang, Shannxi province, belongs to carbonate-type ore deposit in the "Mian-Lue-Ning" triangle zone. Through field investigation and analysis of geological data, the geological characteristics of ore deposit, the main ore-controlling geological factors and metallogenic conditions are studied. It shows that the mineralization is controlled by multiple factors of stratum, geologic structure and magmatite, and the ore bodies are hosted in Sinian carbonate of Duantouya formation and Jiudaoguai formation which are rich in gold, lead, zinc and other metals. The structural fracture zone developed along the north and south wings of Jiudaoguai syncline in the lndosinan-Yanshanian stage controls the spatial distribution of the ore bodies. The small intermediate-acid hypabyssal rock body in Yanshanian is also the important ore-controlling factor which has strong activating effect and enrichment on the elements such as gold, zinc and lead. We systematically summarize that the Liushuping gold and zinc deposit belongs to the sediment controlling-tectonic hydrothermal type, which has a good potential in polymetallic ore resources.
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图 1 柳树坪矿床大地构造位置图
1—鱼洞子岩群；2—碧口岩群(基性熔岩)；3—何家岩岩群；4—二长花岗岩；5—大安岩群；6—南华系—寒武系盖层；7—花岗闪长岩；8—辉长-闪长杂岩体；9—踏坡组—略阳组；10—金矿床；11—铜矿床；12—铁矿床；13—研究区位置
Figure 1. The tectonic location of the Liushuping ore deposit
图 2 柳树坪矿区地质略图
1—震旦系九道拐组第三岩性段；2—震旦系九道拐组第二岩性段；3—震旦系九道拐组第一岩性段；4—震旦系断头崖组；5—中—新元古代碧口群；6—第四系；7—上泥盆统；8—加里东期超基性岩；9—印支期斜长花岗岩；10—印支期石英钠长斑岩；11—印支期闪长岩；12—金、锌矿体位置及编号；13—向斜轴线；14—断层位置
Figure 2. The geological scheme of the Liushuping diggings
图 3 柳树坪矿区南矿段8号勘探线剖面图
1—震旦系九道拐组第二岩性段；2—震旦系九道拐组第三岩性段；3—震旦系九道拐组第一岩性段；4—震旦系断头崖组；5—中—新元古代碧口群；6—加里东期超基性岩；7—印支期斜长花岗岩；8—剥土、探槽位置；9—金、锌品位/厚度；10—第四系；11—金、锌矿体位置及编号
Figure 3. The 8th prospecting line profile map in the south of the Liushuping diggings
图 4 柳树坪矿床矿石照片
a—沉积期晶粒状锌矿石；b—沉积期残余状锌矿石；c—构造期碎裂结构、构造型金锌矿石；d—SZK802中构造期角砾型锌矿石；e—SZK1401中热液期钼矿石；f—地表见热液期集块状锌矿石；g—地表见表生氧化期锌矿石；h—SZK1401浅部表生氧化期构造型金锌矿石
Figure 4. The photographs of the ores in the Liushuping ore deposit
表 1 柳树坪矿区南矿段主要矿体特征
Table 1. The main orebody characteristics in the south of Liushuping diggings
矿体编号 矿体规模/m 矿体形态 平均品位 资源量(333+334) 长度 控制斜深 平均厚度 锌/% 金/(g·t-1) 锌/104 t 金/kg AuZn1 898 250 3.06 层状、似层状 4.82 0.79 7.21 621.13 AuZn3 298 196 2.76 脉状、有分支 5.68 1.75 1.17 98.81 AuZn4 575 218 4.50 似层状、西端有分支 1.56 1.81 1.20 1222.05 Zn1 380 47 2.64 似层状、脉状 5.48 0.36 0.71 21.57 Zn2 212 - 8.28 透镜状 12.51 0.36 1.08 14.54 
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表 2 柳树坪矿区北矿段主要矿体特征
Table 2. The main orebody characteristics in the north of Liushuping diggings
矿体编号 矿体规模/m 矿体形态 锌平均品位/% 锌资源量(333+334)/104 t 长度 平均厚度 Zn6 560 1.83 似层状 6.68 0.80 Zn7 833 1.57 似层状 1.86 0.29 Zn8 575 1.86 似层状 1.84 0.23 Zn9 575 2.04 似层状 2.36 0.33
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表 3 柳树坪矿区不同地质体基岩光谱与化学样品分析结果[10]
Table 3. The bedrock spectrum and chemical analysis of different geological bodies in Liushuping diggings
岩性 样品编号 基岩光谱分析结果 化学分析结果 Au(10-9) Ag(10-9) Cu(10-6) Pb(10-6) Zn(10-6) Au(10-6) Zn(%) 蛇纹岩 B-H1 0.48 32 3.60 0.667 16.0 < 0.05 0.014 蛇纹岩 B-H2 0.61 28 2.95 1.75 27.5 < 0.05 0.030 蛇纹岩 B-H3 0.61 30 3.08 0.965 41.4 < 0.05 < 0.01 白云岩(围岩) B-H4 22 688 76.6 30.0 1354 0.32 0.025 白云岩(围岩) B-H5 10.8 533 722 48.78 488 < 0.05 0.038 白云岩(围岩) B-H5 5.0 384 374 26.6 274 < 0.05 0.079 白云岩(矿体) B-H7 159 2480 568 123 5630 14.38 3.08 白云岩(矿体) B-H8 140 1980 432 118 4852 13.24 2.28 白云岩(矿体) B-H9 208 4850 543 98 3720 19.32 1.92
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