江西德兴铜矿区水系的Cu同位素地球化学特征及其地质意义

陈丹丹; 宋世明; MathurRyan; 郭坤一; 康文凯; 李双喜; 赵晓丹; 张飞

江西德兴铜矿区水系的Cu同位素地球化学特征及其地质意义

Copper isotopic characteristics of the water system in the Dexing copper deposit, Jiangxi Province, and their geological significance

摘要

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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