长江中下游典型火山盆地的水岩相互作用和金属矿床蚀变分带
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  • 英文篇名:Water-rock interactions and metal-alteration zoning in volcanic basins of Middle-Lower Yangtze River Valley
  • 作者:张荣华 ; 胡书敏 ; 张雪彤
  • 英文作者:ZHANG RongHua;HU ShuMin;ZHANG XueTong;Laboratory of Geochemical Kinetics,Institute of Mineral Resources,Chinese Academy of Geological Sciences,MLR Key Laboratory of Metallogeny and Mineral Assessment;
  • 关键词:蚀变分带 ; 溶解反应速率 ; 化学动力学 ; 流体-玄武岩相互作用
  • 英文关键词:Alteration zoning;;Dissolution rate;;Chemical kinetics;;Water-basalt interactions
  • 中文刊名:YSXB
  • 英文刊名:Acta Petrologica Sinica
  • 机构:中国地质科学院矿产资源研究所地球化学动力学实验室,国土资源部成矿作用和资源评价重点实验室;
  • 出版日期:2017-10-15
  • 出版单位:岩石学报
  • 年:2017
  • 期:v.33
  • 基金:中国地质调查局项目(12120113101700);; 安徽省公益项目(2010G28);; 专项(F0001);; 地调项目(DD20160168);; 国土资源部项目(20010302)联合资助
  • 语种:中文;
  • 页:YSXB201710021
  • 页数:17
  • CN:10
  • ISSN:11-1922/P
  • 分类号:318-334
摘要
长江中下游火山岩盆地中金属矿床和蚀变分带的的地球化学研究表明,它们具有内带深色蚀变带和外带浅色蚀变带,形成于600℃到100℃范围。两类蚀变带分界温度大致是300℃。大金属矿床蚀变分带剖面显示出热液系统存在有明显的温度梯度。通过与背景岩石(玄武岩石)对比研究表明,自下而上的不同蚀变岩石中主要元素含量显著变化,交代作用中的代出和代入元素在空间上是演化的。25~400℃和23MPa下矿物(钠长石、阳起石、透辉石、钙铁辉石)-H2O、岩石(玄武岩)-H2O反应的化学动力学实验表明,金属元素释放速率是温度的函数。在恒压升温过程中,从20℃到400℃,硅酸盐矿物、玄武岩中Si溶解速率不断上升;在300~350℃时,Si、Al溶解速率到最大数值。随后,温度再上升导致溶解速率下降。在<300℃时,大部分矿物中Ca、Mg、Fe、Na溶解速率较高,溶液里的Ca/Si、Mg/Si、Fe/Si、Na/Si等都高于矿物中对应元素的计量比。矿物反应后的表面存在富集硅的淋失层,或有富硅铝矿物(粘土矿物)出现。在>300℃时,Si溶解快于其他金属元素,溶液中金属元素与硅摩尔浓度比(Ca/Si、Mg/Si、Fe/Si、Na/Si)等都低于矿物中的计量比。矿物反应后的表面缺少硅的淋失层,或者有贫硅矿物和铁氧化物出现。作者还进行23~35MPa、20~550℃玄武岩与水反应实验。上述高温高压下矿物在水溶液中的溶解反应动力学实验和流体-玄武岩相互作用实验,对于理解金属矿床及蚀变分带形成机制提供新的依据。
        This paper reports kinetic experimental results of mineral in aqueous solutions and water rock interactions at high temperature and pressures.These results are used for us to understand metal-alteration zoning occurred in the volcanic basins in Middle-Lower Yangtze River Valley.Generally,studies on the metal-alteration zoning in the volcanic basins found that there are two sets of alteration zoning,one is melano-cratic alteration zoning at inner parts;the other is leuco-cratic alteration zoning at outer parts.The boundary between melano-cratic alteration zones and leuco-cratic alteration zones is at about 300℃ for their coexisting hydrothermal systems.In the alteration profile,there were temperature gradient occurred.Investigations indicated that the different minerals can precipitate in different zones in the whole profile.Or,different elements can be released in the different zones from deeper to shallow during water-rock interactions.Dissolution experiments of minerals(albite,actinolite,pyroxene,etc.) and rocks(basalts) in aqueous solutions were performed at temperatures from 20 to 435℃ and at pressures of 23 to 36 MPa.Experiments found that the maximum release rates of silica in mineral or in rocks always occur at 300℃.Generally,Ca,Mg,Fe,and Al dissolved more quickly than Si at temperatures in the range 25~300℃,but more slowly than Si in the range 300~400℃.All of the metal release rates varied with temperature.Non-congruent dissolutions occur in most cases.Release ratios Mi/Si,concentrations of dissolved metal vs.dissolved Si in the effluents,vary with temperature.As T<300℃,Ca/Si,Mg/Si,Fe/Si,Na/Si are higher than the stoichimetric numbers in solid.As T>300℃,Ca/Si,Mg/Si,Fe/Si,Na/Si are always lower than the stoichiometric number.Experiments found that a Si-rich,Mi-deficient layers is formed at the mineral surface at temperatures ≤300℃.As T>300℃,a Mi-rich,Si-deficient layers is present at the surface.Release rates for various metals of minerals vary with temperatures,which are different in the different temperatures.These results can be used to interpret the alteration zoning occurred in the present of temperature gradient,because,the release rates of various metals are different in different locations in the profile.
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