Copper Isotope Studies of a Deep Ore Body in the Xinliaodong Copper-Polymetallic Deposit, Eastern Guangdong Province
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摘要: 新寮岽铜多金属矿床是近年来粤东地区新发现的铜多金属矿床之一，矿区位于东南沿海锡、钨、铜等重要矿产发育地区，成矿地质条件非常好。本文通过对矿体中黄铜矿的铜同位素研究表明，其δ65Cu值（-0.34‰~+1.37‰）与斑岩型矿床的δ65Cu值基本一致，成矿物质Cu主要来源于深部岩浆，成矿流体显示为中高温（250~420℃）岩浆热液特征，Cu的分馏与岩浆热液活动关系密切，矿体的形成与成矿流体出溶有关。铜同位素组成随深度增加有增高趋势，能形成规模矿体。同时，铜同位素可以直接指示热源的位置，在热液流体石英脉出现的区域，铜矿体δ65Cu值都低于0，在热液接触带、特殊的赋矿围岩和构造作用部位铜同位素值较高，预示着主矿体的边缘或前锋，是最为明显的找矿标志。Abstract: The Xinliaodong copper-polymetallic deposit of Eastern Guangdong Province is one of newly discovered deposits. The ore district belongs to tin, tungsten, and copper ore cluster in the southeast coast, which have a very good ore-forming geological conditions. Chalcopyrite has δ65Cu value ranging from-0.34‰ to +1.37‰, which is consistent with δ65Cu value of porphyry deposits, indicating that ore-forming material Cu was derived from deep magma and ore-forming fluids were medium-high-temperature (250-420℃) magmatic-hydrothermal fluids. There is a close relationship between the fractionation of Cu isotope and magmatic hydrothermal activity. The formation of ore body is related to the dissolution of ore-forming fluids. With the increase of depth, there is atrend of increasing δ65Cu value, indicating a potential of a largee orebody. Copper isotope can directly indicate the location of the heat source. The δ65Cu values are below 0 for copper ore bodies close to the hydrothermal quartz veins.But the copper isotope values are higher in the hydrothermal contact zone, special ore-bearing surrounding rock and tectonic zone where indicates the edge or the front of the main ore body, most obvious ore prospecting mark.
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表 1 新寮岽矿区不同赋矿围岩中黄铜矿的铜同位素组成
Table 1. Cu isotope composition of chalcopyrite in ore-bearing rocks from the Xinliaodong deposit region
样品编号 围岩 采样位置(m) δ65Cu(‰) ZK2-1-TCU001 石英闪长岩 ZK2-1(深度227.50) 0.40 ZK2-2-TCU002 石英闪长岩 ZK2-2(深度247.01) 0.23 ZK2-2-TCU004 石英闪长岩 ZK2-2深度265.19) 0.46 ZK6-2-TW1 石英闪长岩 ZK6-2(深度208.10) 0.47 ZK6-2-TW2 石英闪长岩 ZK6-2(深度219.76) 0.50 ZK2-1-TCU002 石英闪长岩、石英脉 ZK2-1(深度337.06) -0.01 ZK2-2-TCU001 石英闪长岩、石英脉 ZK2-2(深度244.90) -0.18 ZK2-2-TCU003 石英闪长岩、石英脉 ZK2-2(深度251.54) -0.28 ZK4-2-TCU002 粉砂岩、石英脉 ZK4-2(深度193.72) -0.34 ZK4-2-TCU006 石英脉 ZK4-2(深度245.30) -0.02 ZK4-2-TCU001 粉砂岩 ZK4-2(深度185.05) 0.25 ZK4-2-TCU003 粉砂岩 ZK4-2(深度220.80) 0.29 ZK4-2-TCU004 粉砂岩 ZK4-2(深度223.43) 0.07 ZK4-2-TCU005 泥岩 ZK4-2(深度229.35) 1.37 
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