The ore-controlling tectonic patterns and tectono-geochemical prospecting in the Gaojiajing exploration area, the periphery of the Huize lead-zinc deposit, Yunnan
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摘要:
高家阱勘查区位于云南会泽铅锌矿床北东侧，是矿山厂断裂NE向延伸的有利成矿地段。在1：5000构造地质填图基础上，结合典型构造面力学性质分析，认为高家阱勘查区受NE向矿山厂背斜、矿山厂断裂控制，NE向左行压扭性层间断裂是矿体赋存的有利部位。印支晚期，在NW-SE向应力持续作用下，形成NE向牵引褶皱，构成高家阱控岩控矿构造格架——逆冲推覆构造，为成矿流体的运移提供通道。通过蚀变指数计算，提取肉红色粗晶白云岩、米黄色粗晶白云岩、灰白色粗晶白云岩蚀变信息，划定3个强蚀变地段。通过构造地球化学因子分析，绘制Pb-Zn-Cd-Ag、As-Sb-Hg元素组合异常图，提取异常信息并圈定4个主要异常区。除石炭系外，异常还分布在震旦系、泥盆系，具多层位找矿潜力。综合控矿构造-矿化蚀变-构造地球化学勘查技术组合，提出找矿方向。
Abstract:Located in the northeast of the Huize lead-zinc deposit, the Gaojiajing exploration area is a favorable ore-forming area located on the northeast side of the Kuangshanchang faults. On the basis of the 1:5000 structure geological mapping, the authors studied and summarized the structural styles based on an analysis of the mechanical properties of typical structural surfaces, and consider that the Gaojiajing exploration area is controlled by the thrust-fold structures, NE-trending left-slip compression torsion interlayer faults and NW-trending transtensional faults and is the favorable place in search for ore bodies. In late Indosinian period, Permian-Sinian strata were reversed and the NE-trending drag fold was formed under the action of the NE-striking stress. These factors constituted the tectonic framework of the Gaojiajing exploration area and provided passage and storing space for the flowing metallogenic fluids. The authors extracted alteration information by calculating chemical index of alteration, and delineated three strongly altered places. The authors extracted the combined anomalies of Pb-Zn-Cd-Ag and As-Sb-Hg by using factor analysis method, and delineated four anomaly areas. The abnormal distribution which reflects the "multi-layer" mineral exploration potential was found in Sinian, Devonian and Carboniferous strata. The ore-prospecting direction and the prospecting target are proposed by synthesizing the exploration technology of ore-control structure, mineralized alteration and tectono-geochemistry.
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表 1 高家阱勘查区构造地球化学R型因子分析方差极大旋转载荷矩阵
Table 1. Varimax rotation factor load matrix for tectonites of the Gaojiajing exploration area
元素 Factor 1 Factor 2 Factor 3 Factor 4 Factor 5 Factor 6 Al2O3 0.84 -0.06 0.27 0.02 0.20 0.01 TFe2O3 0.79 0.01 0.34 0.02 0.28 0.29 MgO -0.24 0.03 0.08 0.55 0.05 0.42 CaO -0.79 0.05 -0.10 -0.31 0.07 -0.01 Na2O 0.30 -0.13 0.67 -0.23 0.02 0.24 K2O 0.78 -0.08 0.36 0.05 0.18 -0.12 MnO 0.06 0.19 0.03 -0.03 0.04 0.74 P2O5 0.61 0.04 0.02 0.17 -0.06 0.58 TiO2 0.92 -0.03 0.28 -0.14 0.05 0.08 Ba 0.33 -0.15 0.74 -0.02 0.18 0.07 Sr -0.13 -0.02 0.16 -0.81 0.02 0.10 Cu 0.62 -0.01 0.34 -0.30 0.16 0.23 Zn 0.09 0.78 0.34 -0.01 0.10 0.22 Cr 0.69 -0.07 0.44 -0.18 0.33 -0.09 Co 0.73 -0.01 0.52 -0.19 -0.01 0.17 Ni 0.50 0.04 0.61 -0.24 0.17 0.06 V 0.63 -0.03 0.62 -0.12 0.22 0.14 Li 0.83 -0.03 0.39 0.09 0.10 -0.07 Be 0.58 0.02 0.64 0.05 -0.10 -0.13 Sc 0.78 0.03 0.52 -0.08 -0.11 -0.05 Ga 0.78 0.05 0.56 -0.05 -0.08 -0.05 Ge 0.89 0.01 0.12 0.04 0.20 0.15 Rb 0.81 0.02 0.43 0.12 0.11 -0.21 Zr 0.93 0.05 -0.21 0.07 -0.07 0.06 Nb 0.76 -0.02 0.54 0.01 -0.14 0.03 Mo 0.64 -0.10 0.37 0.16 0.34 0.07 Ag -0.01 0.52 -0.02 0.07 0.06 0.06 Cd -0.31 0.72 -0.18 -0.22 -0.01 -0.05 In 0.32 0.19 0.58 0.05 -0.32 -0.09 Sn 0.23 0.14 0.58 0.14 -0.49 -0.22 Cs 0.63 0.00 0.55 0.12 0.00 -0.38 Hf 0.93 -0.01 0.27 -0.05 0.02 0.01 Ta 0.78 -0.07 0.36 0.00 0.04 0.00 W 0.44 -0.09 0.39 0.00 0.27 -0.11 Tl 0.71 0.06 0.38 0.23 0.12 -0.31 Pb -0.01 0.82 -0.16 0.09 0.16 0.05 Bi 0.45 0.00 0.27 0.09 0.15 -0.36 Th 0.77 -0.01 0.49 0.06 0.09 -0.24 U 0.77 -0.15 0.42 0.00 0.25 -0.07 As 0.34 0.27 0.08 0.18 0.66 0.02 Sb 0.05 0.17 -0.05 -0.06 0.75 0.01 Hg 0.16 0.42 0.10 -0.04 0.47 -0.11 ΣLREE 0.85 -0.02 0.34 -0.26 0.06 -0.05 ΣHREE 0.87 0.19 0.10 -0.27 -0.01 0.03 解释方差 17.47 2.59 6.88 1.81 2.42 2.03 总百分比 0.40 0.06 0.16 0.04 0.06 0.05 
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