| 罗河铁矿水文地球化学特征及成因 |
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| 引用本文： | 龚 星,陈植华,罗朝晖.罗河铁矿水文地球化学特征及成因[J].地球科学,2014,39(3):293-302. |
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| 作者姓名： | 龚 星 陈植华 罗朝晖 |
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| 作者单位： | 1.中国地质大学研究生院, 湖北武汉 430074 |
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| 基金项目： | 国家自然科学基金(No.51109192) |
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| 摘 要： | 作为庐枞盆地较早开展勘探工作的罗河铁矿, 矿区揭露的地下水可分为潜水和承压水2类, 潜水表现为弱碱性HCO3--Ca+·Mg2+型水; 区域构造和凝灰岩阻隔了潜水和承压水的水力联系, 承压水以SO42--Ca2+型微咸温水为主, 水化学成分不受外界因素变化影响.离子比例系数和相关性分析说明承压水中主要水化学反应包括硫酸盐矿物溶解和阳离子交换.PHREEQC反向模拟SO42--Ca2+型承压水的成因主要是砖桥组下段次生石英岩中大量硬石膏、石英和水云母的原位溶解; 与此同时, 地下水中沉淀生成了方解石和绿泥石, 石膏溶解的Ca2+离子吸附交换粘土矿物中的Na+离子, 少量黄铁矿还发生了氧化还原反应.分析结果验证了罗河铁矿深部地下水相对封闭, 补给有限, 以静储量为主.
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| 关 键 词： | 地球化学 反向模拟 聚类分析 矿床 罗河铁矿 |
| 收稿时间： | 2013-07-11 |
Hydrogeochemical Characteristics and Genesis of Luohe Iron Deposit |
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| Abstract: | As one well-explored region of Luzong Mesozoic volcanic basin, the groundwater revealed in Luohe iron deposit can be divided into two types, namely, unconfined and confined groundwater. The unconfined groundwater is alkalescent HCO3--Ca+·Mg2+ water, while the confined groundwater is the SO42--Ca2+ brackish warm water due to the fact that their hydrochemical compositions are almost not affected by external changes because of the water blocking properties of regional structure and volcanic tuff. Ion proportionality coefficients and correlation analyses illustrate that major hydrochemical reactions in confined groundwater are sulfate mineral solution and cation exchange. PHREEQC inverse simulation shows that the cause of SO42--Ca2+ confined groundwater is the numerous anhydrite, quartz and hydromica solution in site, at the same time, some calcite and chlorite precipitate as the secondary minerals. Meanwhile, Ca2+that was dissolved from anhydrite absorbs and exchanges with Na+ in clay mineral, and few pyrites have redox reaction. The analysis verifies the hydrogeological condition of relative closed, limited recharge and static reserves of deep groundwater in Luohe iron deposit. |
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