云南个旧卡房锡矿田花岗岩黑云母矿物化学特征及其成岩成矿意义

黑云母作为花岗岩中含量最高的暗色矿物,其成分特征对指示岩石成因与成矿起着重要作用。云南个旧卡房锡多 金属矿床的形成与花岗质岩浆活动密切相关,卡房花岗岩包含有大量黑云母,通过电子探针测试方法,对该花岗岩中的 黑云母成分进行了系统的研究。结果显示,黑云母为富铁黑云母,具有富硅、铁、铝、钾、钛,贫锰、镁、钙、钠等特 征,含铁指数为0.67~0.83。黑云母的成分特征暗示其结晶温度为500~708 ℃,结晶压力为202~538 MPa,对应的结晶深度为 7.64~20.35 km,表明卡房花岗岩形成于中低温环境、属于中深成相。综合研究认为,卡房锡矿田花岗岩具有高铁指数以及 氧逸度由高到低变化趋势等特征是锡成矿的有利条件,可以作为在本区寻找锡矿的重要标志。     

铜陵宝山陶铅锌金多金属矿区成矿规律及找矿前景

通过对安徽铜陵宝山陶矿区成矿规律的分析,提出矿区的成矿母液主要来自燕山期的新屋里岩体后期分异。多次涌动的新屋里岩体在燕山晚期形成成矿热液,这些热液沿着该地区在印支期形成的层间滑脱断层和切割较深的北西向断层通道输送,在科里奥利力的作用下发生右偏,使得矿体多富集在层间滑脱断层和北西向断层交汇处,特别是北西向断层的右侧。矿液在运移过程中逐渐远离新屋里岩体,随着温度的下降,矿液发生分异,形成靠近岩体的宝山陶矽卡岩型铜矿,以及远离岩体的泉水冲、大竹园矿段铅锌铁矿。     

Determination of trace vanadium (V) in seawater and fresh water by the catalytic kinetic spectrophotometric method

A new kinetic spectrophotometric method has been developed for the determination of vanadium (V). The method is based on the catalytic effect of vanadium (V) on the oxidation of weak acid brilliant blue dye (RAWL) by KBrO₃ using the citric acid as activation reagent. The obtained optimum conditions are: c (RAWL) = 1×10⁻⁴ molL⁻¹, c (KBrO₃) = 3×10⁻² molL⁻¹, c (citric acid) = 9×10⁻³ molL⁻¹, pH = 2.50, the reaction time being 7.0 min and the temperature being 25.0°C. Under the optimum conditions, the proposed method allows the determination of vanadium (V) in the range of 0–70.0 ng mL⁻¹ and the detection limit is down to 0.407 ng mL⁻¹. For standard vanadium (V) solution determination, the recovery efficiency is in the range of 98.5%–102% and the RSD ranges from 0.76%–1.25%. Moreover, it is demonstrated that most cations and anions do not interfere with the determination of vanadium (V) under the analytical condition. The new method was successfully applied in the determination of vanadium (V) in fresh water and seawater samples with satisfactory results. Vanadium (V) in the seawater samples from Qingdao offshore was determined using the method and the distribution of vanadium (V) was mapped. Compared with other instrumental analytical methods, the proposed method shows good selectivity, sensitivity, simplicity, lower cost and rapidity. It can be employed on shipboard easily.     

解析法在青海尕林格Ⅳ矿群三分量曲线中的应用

尕林格矿区矿体和围岩磁性差异明显,磁法勘探是最直接而有效的方法.通过对尕林格Ⅳ矿群成矿地质条件、C_4-4子异常地球物理特征的分析以及用解析法对ZK10001孔三分量磁测井曲线做定性、定量解释,推测出盲矿体的方位、埋深、距离钻孔位置,从而正确布钻,达到找矿目的.     

锡矿山锑矿田幔-壳构造成矿模型及找矿预测

介绍湖南锑的区域地球化学背景特征,分析锑异常分布规律及与构造、岩浆岩的关系,探讨地壳演化与锑矿成矿作用,建立锡矿山锑矿田幔-壳构造模型,并进行找矿预测     

福建紫金山铜金矿田地球物理地球化学特征及找矿模型

在研究紫金山铜金矿田地质特征的基础上,通过对矿田内各类地质体的重力、航磁、遥感等地球物理特征和微量元素地球化学特征的研究,建立了矿田的地质－地球物理－地球化学找矿模型。     

基于GIS基线分割与土地利用单元优化的土壤重金属生态风险累积效应评价方法

以承德市伊逊河红旗钒钛磁铁矿小流域为例,采用富集因子法、潜在生态风险指数法,基于土地利用类型的冗余分析和GIS基线分割模型对流域土壤重金属生态风险累积程度及其影响因素进行了探讨.通过3种土壤重金属生态风险累积效应评价结果的对比,分析了样本加密、土地利用类型和GIS地理处理等优化方法对基线分割评价结果的影响.结果表明:研...     

东坡矿田主要内生矿床成矿规律

通过对东坡矿田内各主要矿床的产状要素、赋矿标高、硫、铅同位素、测温资料的研究,发现矿田内不同的矿床类型,有它们不同的递温规律、分带规律、台阶规律和侧伏方向。对这一有规律的地质现象的研究可有效控制矿床,对矿床进行合理评价。     

Diagenetic and Mineralization Age of the Hehuaping Tin-polymetallic Orefield, Hunan Province

The Hehuaping tin deposit is a large deposit found in recent years during geological surveys. The discovered tin deposit includes not only rock-alteration type deposits in fault zones, but also deposits developed in interstratified rupture zones between Devonian carbonate rocks (Qiziqiao Formation) and sandstone (Tiaomajian Formation). The finding of tin deposits of the latter type has greatly enriched tin-mineralization types in the famous Nanling polymetallic metallogenetic region and may provide us with a new potential orientation for prospecting of tin deposits in the region. It is commonly believed that the forming of the tin deposits in the Nanling region should be related to the Yanshanian instead of Indosinian granitic magmatism. Systematical zircon U-Pb SHRIMP dating in this paper shows that tin mineralizations have endured at least two stages. The early stage should be related to the intrusion of the main body of the Wangxianling granite, which was emplaced during the Indosinian period with a diagenetic and mineralized age of 224.0±1.9 Ma (MSWD=0.54), and the late stage should be related to the intrusion of Yanshanian granitic porphyry that took place after 142±3 Ma (MSWD=0.5).