新疆比勒提地区地球化学场多重分形及异常解释

通过对新疆比勒提地区1：50000水系沉积物测量Cu、Pb、B、Ti元素进行多重分形分析,划分出两类多重分形特征模式,即多重分形幂律图可用2段直线来拟合的模式一和可用3段直线拟合的模式二。模式一中元素可分解为背景与区域异常2个部分,无明显富集,不具成矿潜力;模式二元素除了具有模式一的背景与区域异常外,还发育较强的局部异常,在局部异常处,有较大的找矿潜力。通过对该区地球化学和地质特征分析,圈定靶区4处,为寻找Cu、Pb多金属矿产提供了依据。     

东升庙多金属硫化物矿床主要含矿岩系地质地球化学特征及对矿床成因的指示意义

东升庙矿床是内蒙古狼山-渣尔泰山成矿带上最大的锌多金属矿床,主要含矿岩系是狼山群第2岩组。通过对矿区地质现象的野外观察和钻孔样品地球化学特征的研究,结合国际上同类矿床最新研究进展,对东升庙矿床主矿体的成矿过程提出了新观点。岩、矿石样品的岩相学研究结果显示,不同岩段的岩、矿石有不同的组构特征：第4岩性段中部菱铁矿矿石为典型的细粒镶嵌结构和块状构造,具明显的化学沉积特征;第4岩性段底部②号矿体中的闪锌矿矿石具半自形-它形晶粒结构或溶蚀结构,多为角砾状构造或块状构造,有明显的充填-交代现象;第3岩性段以绢云石墨片岩为主的黑色岩系网脉状矿化普遍,常见后期热液充填现象。岩矿石样品的地球化学研究结果显示,菱铁矿矿石和闪锌矿矿石有相似的微量元素富集特征和稀土元素配分曲线,可能具有同一物质来源。而第3岩性段的绢云石墨片岩有不同的微量元素富集特征和稀土元素配分曲线,可能是多期热液活动作用的结果。值得一提的是,在②号主矿体硫化物矿石中不但发现有来自于矿体下部的有一定磨圆度的绢云石墨片岩碎屑角砾,还有一些来自上部围岩的含炭质白云大理岩角砾。此类碎屑角砾可能是交代残余或者交代过程中垮塌的产物,无法用同时沉积解释。综合分析认为第3岩性段的网脉状矿化是后期热液充填的结果,而第4岩性段底部的②号矿体是含矿热液选择性交代碳酸盐地层而成矿,菱铁矿矿体是富铁热液运移到海底后沉积生成。相对于传统的喷流沉积成矿方式,本文认为交代作用对东升庙主矿体的形成起到了关键作用。     

井中磁测资料预处理与弱信号识别

井中磁测仪器距离场源近,磁测资料受到钻孔打穿磁性体产生的内磁场影响,往往存在强干扰压制有用信号,因此研究井中磁测资料预处理与弱信号识别方法具有重要意义。笔者将地面重磁资料边界识别中倾斜角总水平导数和解析信号振幅方法改进后应用于井中磁测资料预处理中,提出倾斜角垂向导数和均值归一解析信号振幅方法。通过模型分析证明了两种方法都可识别强弱不同的井旁磁性体位置,反映边界信息,且给出了计算均值归一解析信号振幅过程中窗口选择的依据。将两种方法应用于江苏某工区ZK002孔磁测资料预处理中,得出倾斜角垂向导数方法应用于实测资料中会放大干扰,而均值归一解析信号振幅方法增强了该钻孔弱异常信息,且压制了干扰信号,处理结果与磁化率测井和钻孔资料相对应。     

异常结构三维综合系统的开发和应用

地球化学异常结构三维综合系统的开发和应用是为了满足地球化学多维异常体系的研究而逐步展开的。应用于深部找矿预测的多维异常结构方法,从钻孔岩芯直接采样,获得了具有真三维属性的地球化学数据,研究者迫切需要在三维场景下对所获三维地球化学数据进行解读和表达。异常结构三维综合系统(3D-MDAS)是利用三维可视化和地质体三维建模技术,在MapGIS K9平台上进行二次开发获得的。本系统实现了地上、地下数据模型的一体化显示,实现了实体模型与属性模型的耦合一体化显示,在此基础上还可以对异常结构进行空间分析,建立三维地球化学找矿模型。笔者详细阐述了三维异常结构3D综合系统的三维建模思路和技术,并用安徽马头矿区的实际应用成果给以说明。     

玲珑金矿大开头矿区Bi特征及指示意义

在金矿床中,金、铋常常相伴产出,在金矿体周围存在明显的铋异常,它可作为重要的指示元素。笔者研究了玲珑金矿不同岩石中铋与金含量之间的关系,比较了基岩地球化学剖面中两元素的相关性,采用电子探针分析了主要矿石矿物中铋和金的含量,发现不同类型岩石中铋含量差异明显,铋在矿体中含量远高于围岩,在矿区中铋与金呈幂函数正相关,铋原生晕规模大、衬度高,与金都是以独立矿物相形式存在。在玲珑金矿化探找矿中,铋含量高,与金呈较好的正相关关系,是最佳指示元素之一。     

Arsenic Distribution Pattern in Different Sources of Drinking Water and their Geological Background in Guanzhong Basin,Shaanxi, China

To study arsenic(As) content and distribution patterns as well as the genesis of different kinds of water, especially the different sources of drinking water in Guanzhong Basin, Shaanxi province, China, 139 water samples were collected at 62 sampling points from wells of different depths, from hot springs, and rivers. The As content of these samples was measured by the intermittent flowhydride generation atomic fluorescence spectrometry method(HG-AFS). The As concentrations in the drinking water in Guanzhong Basin vary greatly(0.00–68.08 μg/L), and the As concentration of groundwater in southern Guanzhong Basin is different from that in the northern Guanzhong Basin. Even within the same location in southern Guanzhong Basin, the As concentrations at different depths vary greatly. As concentration of groundwater from the shallow wells(50 m deep, 0.56–3.87 μg/L) is much lower than from deep wells(110–360 m deep, 19.34–62.91 μg/L), whereas As concentration in water of any depth in northern Guanzhong Basin is 10 μg/L. Southern Guanzhong Basin is a newly discovered high-As groundwater area in China. The high-As groundwater is mainly distributed in areas between the Qinling Mountains and Weihe River; it has only been found at depths ranging from 110 to 360 m in confined aquifers, which store water in the Lishi and Wucheng Loess(Lower and Middle Pleistocene) in the southern Guanzhong Basin. As concentration of hot spring water is 6.47–11.94 μg/L; that of geothermal water between 1000 and 1500 m deep is 43.68–68.08 μg/L. The high-As well water at depths from 110 to 360 m in southern Guanzhong Basin has a very low fluorine(F) value, which is generally 0.10 mg/L. Otherwise, the hot springs of Lintong and Tangyu and the geothermal water in southern Guanzhong Basin have very high F values(8.07–14.96 mg/L). The results indicate that highAs groundwater in depths from 110 to 360 m is unlikely to have a direct relationship with the geothermal water in the same area. As concentration of all reservoirs and rivers(both contaminated and uncontaminated) in the Guanzhong Basin is 10 μg/L. This shows that pollution in the surface water is not the source of the high-As in the southern Guanzhong Basin. The partition boundaries of the high- and low-As groundwater area corresponds to the partition boundaries of the tectonic units in the Guanzhong Basin. This probably indicates that the high-As groundwater areas can be correlated to their geological underpinning and structural framework. In southern Guanzhong Basin, the main sources of drinking water for villages and small towns today are wells between 110–360 m deep. All of their As contents exceed the limit of the Chinese National Standard and the International Standard(10 μg/L) and so local residents should use other sources of clean water that are 50 m deep, instead of deep groundwater(110 to 360 m) for their drinking water supply.     

Lithium Ion Extraction from the High Ration Mg/Li Salt Lake Brine with Ionic Liquid in Triisobutyl Phosphate and Kerosene

正1 Introduction As the lightest metal with the unique properties of energy production and storage,lithium is regarded as the new century energy metal.Lithium and its compounds were widely used in various industrial fields,especially in     

Preparation of Silver Nanoparticles Film and the Adsorption of Iodide

正Iodine and iodine compounds are widely applied in medicaments,dyes,energy materials,food additives etc.The development and utilization of iodine resources have attracted much attention.A large amount of iodide is     

Phase Equilibrium and Phase Diagram of the Ternary System(MgCl_2 + MgB_2O_4 + H_2O) at 288 and 298 K

正1 Introduction The brines with high concentrations of magnesium and boron resources are widely distributed in the Qaidam Basin of the Qinghai-Tibet plateau,China(ZhengTang,1988).Although some works on the ternary system     

Studies on the Thermodynamics and Thermal Chemistry Properties for Lithium Salts and Their Aqueous Solution Systems

正1 Introduction With the industrial development of lithium battery,nuclear and aerospace industry,the demands of metal lithium and its compounds are increasing significantly.Lithium is called as the energy of the metal in the new century(Zhang et al.2001).The total reserve of lithium resources around the world7