Copper isotopic characteristics of the water system in the Dexing copper deposit, Jiangxi Province, and their geological significance
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摘要:
江西德兴铜矿水系样的δ65Cu值具有极大的变化范围(-5.8‰~+24.4‰), 是迄今为止已报道发现的最大的Cu同位素分馏值。水体中铜的来源可分为黄铜矿源和黄铁矿源, 二者具有明显不同的Cu同位素特征。根据水体的Cu同位素值分布特征, 圈出了流经矿体(矿体上方)水、矿体外围水和尾矿库水3个源区。水体中的Cu主要以离子态和微粒态存在, 二者具有明显不同的65Cu特征, 尾矿库中黄铁矿65Cu对水体的Cu同位素组成具有较大的影响作用。Cu同位素在示踪找矿及地质环境监测方面具有良好的应用潜力
Abstract:The stream water from the Dexing copper deposit has a wide range of copper isotope values(-5.8‰to +24.4‰), which are the highest reported values of the copper isotopic fractionation ever found. The mineral sources of copper dissolved in the water can be divided into chalcopyrite and pyrite with significantly different copper isotopic characteristics. According to the distribution of copper isotope values, three drainage sources were identified, i.e., orebody flowing water, orebody peripheral water and tailings water. Copper exists mainly as ions and particulate copper with different copper isotopic characteristics. The copper isotope values of the pyrite from tailings water have a great impact on the copper isotopic composition in stream water. Copper isotope has a good potential in tracing geological prospecting and monitoring the environment.
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Keywords:
- copper isotope /
- tracer application /
- Dexing copper deposit /
- geological environment /
- tailings
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致谢: 在野外工作中得到了江西赣东北地质大队罗平总工程师和魏英文高级工程师，以及江西铜业集团德兴矿业有限公司地质测量中心张映红主任的大力支持，审稿人对本文提供了宝贵的意见，在此一并表示感谢。
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图 1 德兴矿区地质简图及采样位置
Figure 1. Simplified geological map of the Dexing copper deposit, showing sampling sites
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图 2 德兴铜矿水系样δ65Cu数值分布示意图
Figure 2. Distribution of Cu isotope values in the water system of the Dexing copper deposit
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图 3 德兴水系样过滤前后δ65Cu值变化及源区对比示意图
Figure 3. Variation ofδ65Cu values before and after filtering for water system sample from Dexing in comparison with the source area
表 1 德兴铜矿水系样的Cu同位素数值与铜铁离子含量
Table 1 Copper isotope values and copper and iron concentrations of the Dexing copper deposit
样品号 采样 δ65Cu/‰ Cu/10-6 Fe/10-6 δ65Cu/‰ Cu/10-6 Fe/10-6 过滤后 未过滤 S2 29°01′4″ 117°42′33" 2.36 1.00 0.05 2.14 1.34 < 0.05 S3 29°01′17″ 117°42′32" -0.44 0.34 0.05 n.a. 0.56 < 0.05 S4 29°01′17" 117°42′33" 6.19 3.80 < 0.05 n.a. 3.72 < 0.05 S5 29°01′26" 117°42′35" 3.10 n.a. < 0.05 n.a. 0.92 n.a. S6 29°01′39″ 117°42′34" 9.20 n.a. < 0.05 n.a. 1.24 n.a. S7 29°01′34" 117°42′49" -5.85 2.04 0.03 1.85 2.71 < 0.01 S8 29°01′53" 117°42′39" 3.10 1.58 0.52 n.a. 1.35 < 0.01 S9 29°02′20" 117°42′38" 8.09 33.00 0.63 1.45 30.39 < 0.01 S10 29°02′20" 117°42′21" 1.77 212.71 2.57 2.26 226.58 2.42 S11 29°03′32" 117°41′48" -0.74 5.80 6.68 2.17 6.56 2.53 S12 29°04′39" 117°40′55" 12.71 n.a. 0.15 n.a. 0.25 n.a. S13 29°00′58" 117°42′31" 4.12 10.32 0.13 n.a. 10.28 0.08 S14 29°02′9" 117°41′56" 24.40 0.24 0.53 n.a. n.a. n.a. S16 29°01′16" 117°43′35" 2.38 415.28 22.30 1.62 411.36 22.98 S17 29°00′54" 117°42′46" 4.28 n.a. 0.42 n.a. 0.32 n.a. S18 29°00′52" 117°42′47" 9.58 n.a. 0.76 3.83 1.99 n.a. S19 29°00′42" 117°42′26" 8.30 < 0.01 0.00 n.a. 0.30 < 0.01 S20 29°00′43" 117°42′21" 0.99 n.a. < 0.05 n.a. 0.29 n.a. S21 29°01′36" 117°42′46" 11.01 < 0.01 0.11 7.65 0.32 0.01 S22 29°01′31" 117°42′30" 10.41 < 0.01 0.01 n.a. 0.26 0.04 S27 28°59′11" 117°44′26" -0.10 n.a. 28.16 2.78 33.88 n.a. S28 28°59′16" 117°44′14" 2.96 9.83 4.05 2.94 10.23 2.85 S29 28°58′24" 117°44′09" 1.60 n.a. 0.54 0.05 6.57 n.a. S30 29°02′22" 117°46′13" 12.24 n.a. < 0.01 n.a. < 0.01 n.a. S31 29°02′28" 117°46′20" 6.61 < 0.01 < 0.01 n.a. < 0.01 < 0.01 S32 29°03′13" 117°46′15" 11.00 0.04 0.04 10.04 < 0.01 < 0.01 S33 29°03′44" 117°45′51" 34.42 < 0.05 < 0.05 n.a. n.a. n.a. S34 29°04′36" 117°40′08" 10.37 < 0.01 0.09 n.a. < 0.01 0.14 注：Cu同位素在美国亚利桑那大学地质系同位素实验室完成，仪器为Nu Plasma HR型多接受电感耦合质谱仪（MC-ICP-MS），分析精度为±0.15‰ 
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