Metallogenic Element Geochemistry Characteristics and Genesis of the Zhuxi Copper-Tungsten Polymetallic Deposit, Jiangxi Province Base Using XEPOS X-ray Fluorescence Spectrometry
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摘要: 江西朱溪铜钨矿是近年新发现的一个以钨铜为主的多金属大型至超大型矿床，成矿潜力巨大，但目前仅对矿床地质特征等有所研究，研究程度较低，因此急需对矿床成因类型、地球化学特征等进行深入研究。本文对铜钨矿体钻孔岩芯样品进行直接粉末制样，应用XEPOS型偏振激发能量色散X射线荧光光谱仪分析主量元素(SiO2、CaO、MgO)，微量元素(Cu、W、Zn、Ag)的含量，研究朱溪矿区成矿元素的地球化学特征。结果表明，主量元素SiO2、CaO、MgO交代作用显著，SiO2和CaO呈“对顶”之势；微量元素Cu、W、Zn、Ag等含量随深度增加呈波状起伏是受构造控制的岩层交代的明显特征，且Cu、W在空间上有中间高、两边低的分布特征。这些元素的变化趋势均表明该矿体属于交代成因，而元素的变化反映到矿物组合也说明成矿物质来源与花岗岩、花岗斑岩、花岗岩闪长岩等有关。本文的研究成果可为进一步勘探工作与成矿预测提供理论依据。Abstract: The Zhuxi deposit is a new discovery of copper-tungsten dominated large-super-large ore deposit with great mineralization potential situated in the Zhuxi Area, Jingdezhen City, Jiangxi Province. However, present research is somewhat limited for some of the geological characteristics. Further study on genetic types and geochemical characteristics for this deposit is necessary. A bench-top type Polarized Energy Dispersive X-Ray Fluorescence Spectrometer, coupled with directly pressed powder samples has been used to analyze drill core samples of the Cu-W ore body. The instrument used in the experiments has a high detection ability for measuring major elements (SiO2, CaO and MgO) and trace elements (Cu, W, Zn and Ag), compositions with low detection limit, small error, good stability and other characteristics. The experimental results show that the major elements of SiO2, CaO and MgO have strong metasomatism characteristics. The SiO2 and CaO have a negative correlation. Trace elements Cu, W, Zn and Ag also exhibit symbiotic features, and Cu, W contents are high in the middle and low on both sides spatially. All evidence explains the metasomatism characteristics controlled by structures. The element variations and related mineral compositions also indicate that ore-forming materials were derived from granodiorite, porphyry, granite porphyry and diorite. These results provide a theoretical basis for mineralization forecast and further exploration goals.
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表 1 偏振激发-能量色散X射线荧光光谱法分析地质样品的测量条件
Table 1. Instrument conditions for geological sample measurement by EDXRF
测量元素 X光管条件 二级靶
(偏振靶)测量时间t/s U/kV i/mA Fe，Co，Ni，Cu，Zn，Ga，Ge，As，Se，Br，Rb，Sr，Y，Hf，Ta，W，Bi，Tl，Pb，Th，U 40 1.0 Mo 200 Zr，Nb，Mo，Ag，Cd，In，Sn，Sb，I，Cs，Ba，La，Ce 60 0.66 Al2O3 220 K，Ca，Sc，Ti，V，Cr，Mn 25 1.6 Co 200 Na，Mg，Al，Si，P，S，Cl 25 2.0 Pa 100 注：Pr、Hf、Ta、W、Bi、Tl、Th、U等元素采用Lα线，Pb采用Lβ1线，其他各元素均采用Kα线进行分析。 
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表 2 朱溪矿区42号勘探线钻孔岩芯样品主量元素分析
Table 2. Analytical results of major elements from drilling core samples of No.42 exploration line in Zhuxi mining area
钻孔编号 样数/个 采样深度/m w(SiO2)/% w(MgO)/% w(CaO)/% 含量范围 平均值 含量范围 平均值 含量范围 平均值 ZK4207 72 528.3~1044.8 0.05~81.92 21.86 1.14~30.35 16.87 3.79~52.89 30.97 ZK4208 94 78.5~1400.1 0.03~76.62 20.98 1.22~28.17 12.49 1.42~56.4 37.76 ZK4209 153 74.5~163.2 0.02~80.38 28.61 0.57~29.59 13.58 0.37~57.22 31.68
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表 3 朱溪矿区42号勘探线钻孔岩芯样品成矿元素分析
Table 3. Analysis results of primary ore-forming elements from drilling core samples of No.42 exploration line in Zhuxi mining area
钻孔编号 样数/个 采样深度/m w(Cu)/(μg·g-1) w(W)/(μg·g-1) w(Zn)/(μg·g-1) w(Ag)/(μg·g-1) 含量范围 平均值 含量范围 平均值 含量范围 平均值 含量范围 平均值 ZK4207 72 528.3~1044.84 3.1~12090 640.66 6.2~11950 709.97 103.8~56040 2957.53 0.6~289.2 20.23 ZK4208 94 78.5~1400.13 7.7~38900 1052.54 2.2~33510 1966.27 10.7~11440 699.53 0.6~288.5 18.84 ZK4209 153 74.5~163.2 1.2~8633 499.43 2.5~32780 1896.31 11~18620 646.37 0.5~133.1 7.85
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