The C-O and Zn isotopic compositions of the Laochang Ag-Pb-Zn ore bodies in the Changning-Menglian suture zone,and its geological implicationsSCIEI北大核心CSCD

老厂矿床是昌宁-孟连缝合带内唯一大型矿床,本文报道了老厂矿床Ag-Pb-Zn矿体中Ⅰ号矿体群下部块状矿体和上部网脉状矿体的方解石C-O同位素组成,以及Ⅰ、Ⅱ、Ⅳ三个矿体群内闪锌矿的Zn同位素组成。Ⅰ号矿体群下部块状矿体和上部网脉状矿体方解石δ¹³C_PDB的范围分别为-6.17‰～2.71‰和-2.18‰～3.87‰,δ¹⁸O_PDB的范围分别为-19.57‰～-17.23‰和-22.10‰～-16.21‰;计算获得对应成矿流体的δ¹³C_CO2为-6.16‰～1.53‰和-2.39‰～6.43‰,δ¹⁸O_H2O分别为1.62‰～7.62‰和4.36‰～16.92‰,通过与岩浆CO₂(δ¹³C=-2‰～-8‰)和围岩灰岩(δ¹³C=-1.6‰～4.0‰)的δ¹³C值相比较,指示块状矿体成矿流体中的碳主要来自岩浆,网脉状矿体成矿流体中...     

南秦岭旬阳盆地志留纪黑色岩系与Pb- Zn矿床成矿的关系

南秦岭旬阳盆地中赋存了大量热水沉积型铅锌矿床,矿体主要呈层状、透镜状赋存在志留系梅子垭组和双河镇组中.富有机质的黑色岩系在区内广泛发育,为了探讨志留纪黑色岩系与该区铅锌矿成矿的关系,本文选择南沙沟和关子沟典型铅锌矿床开展研究.与矿石矿物共生的石英δDV-SMOW值分别介于-139‰～-94‰和-129‰～-103‰之间,明显低于矿区内硅质岩的δDV-SMOW值,反映了海水在被加热形成盆地热卤水的过程中很大程度受到了地层中有机质的影响.闪锌矿和方铅矿样品δ34S值分别介于4.5‰～10.7‰(平均7.2‰)和2.7‰～9.5‰(平均6.1‰)之间,硫主要为硫酸盐还原而成,细菌硫酸盐还原作用和热化学硫酸盐还原作用共同影响了硫同位素组成.铅同位素组成具有高放射性铅的特点,与地层铅一致,并且显著区别于结晶基底的铅同位素,反映了铅主要来源于赋矿围岩而不是结晶基底.志留纪南秦岭古海洋中热水沉积成矿作用强烈,盆地热驱动造成海水对流循环并萃取黑色岩系中的成矿物质形成成矿流体,在减压环境下于海底形成层状矿体,在成矿的过程中,富有机质的志留纪黑色岩系对于金属的来源和硫的来源均扮演了至关重要的角色.     

云南龙陵勐糯铅锌矿床中镉元素赋存状况

矿床中镉元素异常明显,以硫镉矿、不规则粒状、脉状充填嵌布于闪锌矿中。提出矿石生成顺序,为进一步找矿提供新依据。     

皇山矿区铅锌多金属矿地质特征及成矿条件分析

利用阶段地质勘查成果,根据矿区所处区域地质位置,综合矿区地层、构造和岩浆岩发育情况,通过对矿体地质特征的描述、岩浆岩化学成分组成特征及成矿条件分析,指出矿区找矿标志,对今后寻找类似矿床具有一定的指导意义。     

江西银山铅锌矿床成矿流体特征

银山铅锌矿床产于前震旦系地层中，容矿围岩主要为千枚岩，矿体呈脉状受构造裂隙控制，流体包裹体及同位素研究表明金属元素及硫主要来自上地幔，流体主要是岩浆水，矿床属中低温岩浆热液矿床，为燕山期成矿。     

掺Zn球形氢氧化镍的研究

采用化学沉淀法制备球形氢氧化镍,通过对制备条件pH值、添加剂量、搅拌强度的研究,探讨了其对掺Zn球形氢氧化镍     

多接收电感耦合等离子体质谱(MC-ICPMS)测量铜、锌、铁的同位素组成及其地质意义

Cu、Zn、Fe同位素示踪是近年来发展起来的一项新兴的同位素地球化学方法。本文介绍了用多接收电感耦合等离子体质谱 (MC ICPMS)精确测量铜、锌、铁同位素比值的方法 ,发现这些元素的同位素组成在不同地质与成矿环境中有明显变异 ,因而它们在矿床学、古海洋学和生物学等诸多领域具有广泛的应用前景。     

保定地区锌矿泉水找水方向

本文阐明了地下水流经含锌岩石是锌矿泉水形成的前提。岩浆岩是锌矿泉水的主要产出岩性。构造隆起区的断裂构造能提供锌矿泉水形成的氧化环境、适宜的水动力条件及较高的温度。据此认为，本区锌矿泉水找矿方向是：①太行山区岩浆岩分布区、岩浆岩与围岩接触带；②有岩脉入侵的断裂发育带。重点是锌矿区、锌异常区及外围的断裂带、蚀变带。     

Application of geostatistics and GIS technique to characterize spatial variabilities of bioavailable micronutrients in paddy soils

To understand the spatial dependency of bioavailable micronutrients in paddy soils, 134 soil samples were taken from Pinghu County, Zhejiang Province, south-east China to characterize the spatial variabilities of bioavailable Cu, Zn, Fe, and Mn. The geostatistics and geographic information system (GIS) techniques were applied. Bioavailable Zn and Mn were fitted to an exponential model with a range of 4.4 km and 2.97 km, respectively. Bioavailable Fe was fitted to the linear model with the longest range of 23.48 km. Bioavailable Cu did not show any spatial correlation with the fitted pure nugget effect model. Bioavailable Zn and Mn had strong spatial dependence due to the effects of intrinsic factors such as parent material, relief and soil types. Bioavailable Fe had moderate spatial dependence over a long distance. The spatial distribution of the four bioavailable micronutrients were significantly correlated to the soil formation factors. Human activity, such as application of fertilizer and pesticide, emission of waste gas and industrial pollution also had significant effects on the spatial distributions of the bioavailable micronutrients.     

Sediment hosted lead–zinc deposits of the Neoproterozoic Bambuí Group and correlative sequences, São Francisco Craton, Brazil: A review and a possible metallogenic evolution model

The Proterozoic sediment-hosted Zn–(Pb) sulfide and non-sulfide deposits of the São Francisco Craton, Brazil, are partially syn-diagenetic and epigenetic and were probably formed during extensional events. The majority of the deposits occur within shallow water dolomites. The Pb isotopic data of sulfides are relatively homogeneous for individual deposits and plot above the upper crust evolution curve of the Plumbotectonic model. Some of the deposits are characterized by highly radiogenic lead (²⁰⁶Pb/²⁰⁴Pb ≥ 21) originating from the highly radioactive crust of the São Francisco Craton. Pb and S isotopic data suggest the sources of metal and sulfur for the deposits to be the basement rocks and seawater sulfates in the sediments, respectively. The relatively high temperatures of formation (100 to 250 °C) and moderate salinity (3% to 20% NaCl equiv.) of the primary fluid inclusions in the sphalerite crystals suggest the participation of basinal mineralizing fluids in ore formation. The steep paleo-geothermal gradient generated by the radioactively enriched basement rocks probably assisted in heating up the circulating mineralizing fluids.