构造地球化学测量在找金中的应用

通过马庄山地区构造地球化学测量找金试验和在特克斯县１５号水系沉积物异常区开展构造地球化学测量的推广应用证明：构造地球化学测量工作,以遥感地质构造解译为先导,民裂裂构造裂隙充填物及蚀变岩石为采样介质,较岩石地球化学测量更具有矿直接性。     

初论西藏冈底斯带中段尼木西北部班岩铜矿地质特征

西藏冈底斯带尼木西北部具有斑岩型铜矿产出的有利地质条件，已有厅宫，冲江，白容，岗讲，渡布曲等铜矿床（点），可望形成大型－超大型班岩铜矿集中区，其资源量远景可达400－600万t以上，在分析地背景的基础上，总结了矿床的地质特征，并与国内外斑岩铜矿进行了对比，建立了本区铜矿的综合遥感地质找矿模型。     

北祁连山银灿铜矿矿床地质特征及成因

银灿铜矿地处于北祁连走廊南山北坡—冷龙岭岛弧带中,矿区出露一套具双峰式火山岩特征的火山沉积建造,矿体主要赋存在石英角斑岩中并存在明显分带,上部为铜矿体向下部变为锌矿体,矿石类型属黄铁矿型多金属矿石,成矿作用过程直接或间接与火山活动有关,是北祁连地区早古生代典型的海相火山岩型块状硫化物矿床。     

初论紫金山铜金矿床超临界成矿流体系统

紫金山矿床是我国东南沿海发现的大型金铜矿床.在分析超临界成矿流体系统形成的区域地质背景和研究成矿物理化学条件的基础上,探讨了超临界成矿流体系统形成的动力学条件,提出该系统的成矿机理:与燕山晚期酸性火山-侵入岩浆有关的金铜矿床是在上地幔隆起、张性或向张性过渡背景下形成的,酸性岩浆经熔体-流体分离作用形成的岩浆热液与大气降水混合,经水-岩作用等复杂的输运和化学反应耦合过程的动力学产物.     

综合分析技术在微细粒浸染型金矿金赋存状态研究中的应用

采用化学组分分析、物相分析、粒度筛析、X射线面扫描分析、矿物分离分析并结合数理统计分析等综合分析技术对微细粒浸染型金矿进行工艺矿物学研究,较为快速、准确地查明该金精矿金的赋存状态.几种分析方法互为补充,结果吻合.     

老挝爬奔金矿围岩蚀变特征及其与金矿化的关系

爬奔金矿位于琅勃拉邦岛弧带中段西侧,矿体赋存于石炭-下二叠统厚层-巨厚层灰岩中,受NW-NNW向断裂构造控制,是少硫化物型中-低温热液矿床。野外调研及室内研究结果表明:爬奔金矿的围岩蚀变以中-低温蚀变矿物组合为特征,主要有硅化、褐铁矿化、菱铁矿化、方解石化,随着岩石蚀变强度的增加,Au与Si、Fe同步增加,而Ca减少。蚀变受断裂构造控制,分带明显,不同的矿化蚀变对应不同的矿石类型。多种蚀变叠加部位是成矿有利地段。“红化”蚀变和“褪色”蚀变是区内独特的围岩蚀变现象,找矿指示作用明显,结合构造、地层、化探异常等其他条件,可作为矿区外围及邻区的找矿标志。     

断裂构造控矿的数学和力学分析：以山东新城——河西金矿区为例

以山东新城－河西金矿区为例,通过新城、河西和候西矿床容矿断裂的形态、断裂活动、构造因素、构造应力场和变形场的数学、力学半定量及定量分析,探计断裂构造控矿规律以及成矿的力学机理。提出了金矿成矿受主断裂面形态、次级小断裂、节理的发育强度,断裂构造的力学特征、变形强度等控制。矿体多位于波状起伏的主断裂面凸峰的下盘、凹谷的上盘。矿化强度与次级断裂、节理的发育强度正相关。断裂构造带和次级构造裂隙带是内应力低     

Petrogenetic and Metallogenetic Background of the Dajing Cu–Sn–Ag–Pb–Zn Ore Deposit, Inner Mongolia, and Characteristics of the Mineralizing Fluid

Abstract: The Dajing Cu–Sn–Ag–Pb–Zn ore deposit, Inner Mongolia of China, is a fissure‐filling hydrothermal ore deposit that occurs within the Upper Permian Linxi group. No magmatic pluton and volcanic rocks outcrop on the surface of the deposit. Most of ore veins show clear‐cut boundary with country rocks. Wallrock alterations that include silicification, carbonation, chlori–tization, and sericitization are generally weak and occur in the close vicinity of ore veins. Mineralization is divided into three stages: (1) cassiterite–arsenopyrite–quartz stage, (2) sulfide stage, and (3) Pb–Zn–Ag–carbonate stage. These mineralization stages have distinct ranges of homogenization temperatures, 290–350C for Stage 1, 260–320C for Stage 2, and 150–250C for Stage 3. However, salinities for Stages 1, 2, and 3 overlap and range between 2.2 and 10.4 wt % NaCl equivalent. The dD values relative to V‐SMOW of inclusion water from quartz are lower than –88% and centered at –100 to –130%. The δ³⁴S values relative to CDT of sulfide ore minerals and δ¹³C values relative to PDB of carbonate gangue minerals, vary from –0.3 to +2.6%, and from –7.0 to –2.9%, respectively. Integrated isotopic data point to two major contributions to the mineralizing fluid that include a dominant meteoric‐derived water and the other from hypogene magma for sulfur and carbon species. Analyses of inclusion gas and liquid compositions are performed. The H₂O and CO₂ are the two most abundant gaseous components, whereas SO₄^2‐ and Cl^‐, and Na⁺, Ca²⁺, and K⁺ are the major anions and cations, respectively. A linear trend is shown on the gaseous H₂O versus CO₂ plot. Phase separation is excluded as cause for the trend on the basis of isotope data and fluid inclusion microthermometry. In addition, a weak wallrock alteration does not support fluid‐rock interaction as an efficient mechanism. Hence, the linear H₂O–CO₂ trend is interpreted in terms of absorption or dilution of CO₂–dominant magmatic vapor by meteoric‐derived water. Cooling effects resulting from dilution may have caused precipitation of ore minerals. Major and trace element compositions of regional granites show a high‐K calc–alkaline characteristics and an arc–affinity. Lead isotopic compositions of galena samples from the Dajing deposit exhibit elevated U/Pb and Th/Pb ratios. These characteristics indicate a common source of supra subduction zone mantle wedge for regional granites and metals from the Dajing deposit.     

X荧光光谱分析技术在测定安徽月山矿床铁铜矿石中Fe、Cu的应用研究

为建立符合安徽月山矿区的X荧光光谱(XRF)分析方法,针对矿区铁矿、铜矿的特点,用铁、铜矿石的国家标准物质制作系列校准样片,通过粉末压片和玻璃熔融两种制样方法,波长色散X荧光光谱法测定主矿体样品中的Fe、Cu等主量元素,并将测定结果与传统化学方法分析结果进行比较。结果显示,熔片法-XRF的测定结果与化学容量法测定结果一致,试样在850℃灼烧,按40∶1大稀释比熔融制样,解决了样品在高温熔融过程中对铂黄坩埚的腐蚀,适用于月山矿区铁铜矿样品中Fe、Cu的测定。粉末压片法不能克服矿物效应和粒度效应的影响,测定结果与化学容量法结果比对偏差较大,不适用于月山地区铁铜矿中Fe、Cu的测定。     

姑婆山复式岩体的基本特征及其与成矿作用的关系

姑婆山复式岩体由晚侏罗世里松岩体、姑婆山岩体及早白垩世新路岩体组成。复式岩体为壳幔混合源成因。据岩石地球化学判断和分析,姑婆山岩体和新路岩体为含锡岩体;整个姑婆山复式岩体为含钨岩体,里松岩体和姑婆山岩体为含稀有、稀土岩体。上述矿产的形成与岩石中挥发份F、B及放射性U、T h等元素的高含量有关。