Giant Mineral Deposits and Their Geodynamic Setting in the Lanping Basin, Yunnan, China

There are giant mineral deposits, including the Jinding Zn-Pb and Baiyangping Ag-Co-Cu, and otherimportant mineral deposits (e.g., Baiyangchang Ag-Cu, Jinman Cu deposits, etc.) in the Lanping Mesozoic-Cenozoic Basin, Yunnan Province, China. The tabular ore-bodies and some veins hosted in terrestrial clastic rocks of the Mesozoic-Cenozoic age and no outcropping of igneous rocks in the giant deposits lead to the proposal of syngenetic origin, but the giant mineral deposits are not stratabound (e.g. MVT, sandstone- and Sedex-type). They formed in a continental red basin with intense crust movement. The mineralization is controlled by structures and lithology and occurs in different strata, and no sedimentary nature and no exhalative sediments are identified in the deposits. The deposits show some relations with organic matter (now asphalt and petroleum) and evaporates (gypsum). The middle-low-temperature (mainly 110℃ to 280℃) mineralization took place at a depth of about 0.9 km to 3.1 km during the early     

岩浆成矿体系的热演化和剥露史的数字模拟

通过对岩浆冷却过程的数字模拟研究,揭示出岩浆在冷却成矿过程中的温度分布和变化规律及影响因素．在此基础上,进一步应用高精度的温龄计组合来限定岩浆成矿体系的热演化和剥露历史,精确地计算出岩浆的初始侵位时间和深度、矿物结晶时间、冷却速率、冷却和暴露地表时间,以及剥露和剥蚀速率等重要参数,并将模拟结果应用于斑岩铜矿床的成矿研究中．研究表明,将精确的年龄测试手段与计算机模拟技术相结合,可为定量研究岩浆矿床的热演化和剥露史、深入了解矿床的成因机制提供一种有效方法．     

安徽省宿松县铜铃寨金多金属矿地质特征、成矿条件与找矿标志探讨

本文对安徽省宿松县铜铃寨金多金属矿产出地质特征进行介绍,及其与地球物理、地球化学对应关系予以分析,指出该矿区构造蚀变岩带有进一步寻找蚀变岩型金矿潜力。     

浙江省衢州市上方镇重钙方解石矿工艺指标影响因素

重质碳酸钙的白度和色相值(Lab)是最重要的工业指标,但影响因素尚不清楚.本文通过扫描电镜、粉晶X射线衍射(XRD)和电感耦合等离子体发射光谱(ICP-OES)等分析手段,对浙江衢州上方镇的重钙方解矿石进行了研究,以期阐明重质碳酸钙白度和色相的影响因素.结果表明,矿石随研磨粒度的减小白度逐渐增加,在100～400目,白...     

西藏甲玛矿床南坑高分异Ⅰ型花岗斑岩及黑云母矿物学特征

高硅花岗岩对于理解浅部岩浆房的行为具有重要意义.本文对西藏甲玛矿区南坑矿段的花岗斑岩开展了岩相学、岩石地球化学及黑云母矿物学研究.结果显示,该花岗斑岩具有高SiO2(73.39％～77.99％)、高K2O(4.34％～6.45％)和低P2O5(0.03％～0.06％)特征,铝饱和指数为0.97～0.98,富集Rb、Th...     

Oxidation of As-bearing gold ore—a comparison of batch and column experiments

This study deals with the experimental determination of the rate of weathering and As release from Au-bearing sulfide ores of the Mokrsko-West deposit (Czech Republic). The elevated As contents in the ore and the possible As mobilisation must be taken into account due to the close proximity of the deposit to the Vltava River, a source of drinking water for Prague. Crushed and homogenized ore material was divided into four grain-size fractions showing uniform chemical and mineralogical composition and subjected to batch and column leaching experiments. The most important reactions controlling metal leaching include (i) oxidation of sulfides, (ii) carbonate equilibrium and (iii) precipitation of hydrated ferric oxides (HFO). Hydrated ferric oxides were found to be important sorbents of mobilized As. The highest concentration of As in the leachates was obtained from the 64–1000 μm fraction. The oxidation rate in the agitated batch experiment calculated on the basis of sulfate concentrations is an order of magnitude higher (3.8×10⁻⁹ to 4.4×10⁻⁸ mol SO₄²⁻ h⁻¹ g⁻¹) than in the static column experiment (9.6×10⁻¹⁰ to 7.4×10⁻⁹ mol SO₄²⁻ h⁻¹ g⁻¹). The higher oxidation rate of batch experiments is explained by abrasion of oxidation products (mainly HFO) and by further exposition of reaction surfaces of the sulfide grains.     

中国金红石矿床成矿地质条件及成矿远景

中国金红石矿床成因类型不一,控矿因素各异。通过对地层、构造(包括大地构造环境及褶皱)等控矿因素,区域变质作用、岩浆作用、热液作用、风化及沉积作用等成矿地质条件及矿床分布等规律的归纳与研究,提出了陕西石泉-镇坪、陕西丹凤-西峡、河南南召-方城、湖北枣阳-河南新县、湖北英山-潜山、江苏徐州-东海、山东栖霞-荣城、山西代县-河北涞水、四川会东9个金红石成矿远景区。并圈定出山东省荣城曲家、安徽凤阳板桥、湖北郧西土门—涧池、湖北七里坪大悟仙山、山西代县义成沟—羊廷寺、河北涞源司各庄、河北丰宁黄土梁等7个找矿靶区。     

矿山人均保有储量:我国金属矿山合理经济开发的一个标量

文章分析对比了我国国有及非国有规模以上矿山企业的主要经济指标,认为矿业开发要走可持续发展的途径,促进矿产资源的充分、合理、有效开发,实现满足市场需求、兼顾环境保护和社会稳定的目标,就必须积极探索和慎重考虑矿山企业从业人数的合理控制问题;依据胶东大型金矿山实际资料的初步分析,明确提出"矿山人均保有储量"是制约矿山合理开发和矿业可持续发展的重要指标;矿山人均储量的合理配置和适度调控问题不仅值得进一步研究,而且应该引起有关部门的广泛注意和高度重视.     

广西佛子冲铅锌矿田地质特征及找矿模式

广西佛子冲铅锌矿位于桂东南博白-岑溪多金属成矿带北东端。矿床的形成是古生代地层的岩性差异、长期构造活动带以及燕山期多次侵入的壳慢混合型岩浆岩三方面联合效应的结果。作者通过对该矿床地质矿产特征、矿床温压地球化学的总结,建立了佛子冲铅锌矿田成矿模式;并依据前人工作的大量地质和测试资料,建立了该矿田的综合找矿模式。指出了下一步工作的重点区域。     

磁法在云南武定地区铁铜矿勘查中的应用

矿产资源远景调查目的主要就是圈定找矿靶区及寻找隐伏矿体,磁法勘探对于寻找铁铜矿有较大的优势。在云南武定地区开展的1：5万磁法测量工作,共圈出了四个异常区块（A、B、C、D异常区）。在B异常区块进行1：1万高精度磁测,解析延拓显示位于该区块东南部的三度体异常具有深源性,规模较大,并出现较大的磁异常梯度带,且处于主控矿构造断裂带上,划定为该区域的重点勘探远景区。