Origin of Gold—Bearing Fluid and Its Initiative Localization Mechanism in Xiadian Gold Deposit,Shandong Province

The composition of quartz inclusions and trace elements in ore indicate that gold-bearing fluid in the Xiadian gold deposit,Shandong Province,stemmed from both mantle and magma,belonging to a composite origin.Based on theoretical analysis and high temperature and high pressure experimental studies,gold-bearing fluid initiative localization mechanism and the forming environment of ore-host rocks are discussed in the present paper.The composite fluid extracted gold from rocks because of its expanding and injecting forces and injecting forces and flew through ore-conducive structures,leading to the breakup of rocks.The generation of ore-host faults and the precipitation of gold-bearing fluid occurred almost simultaneously.This study provides fur-ther information about the relationships between gold ore veins and basic-ultrabasic vein rocks and intermediate vein rocks,the spatial distribution of gold ore veins and the rules governing the migration of ore fluids.     

内蒙古新巴尔虎右旗查干诺尔地区铀成矿远景分析

查干诺尔盆地位于海拉尔盆地群西部，发育于额尔古纳前寒武纪中间地块之上。该区有利的区域轴成矿地质条件是：盆地西部是最具砂岩型铀矿成矿远景和潜力的单斜构造区，具备成矿的铀源、古气候和含矿主岩条件，发育完善的补给－径流－排泄地下水动力系统；航空放射性测量、地下水水中分析测试，以及地面伽玛能谱测量的铀含量高低，在研究区内具有一定的分布规律。本文通过地质调查、水文和物化探测量，结合钻探成果，综合钻探成果，综合分析了查干诺尔盆地砂岩型铀矿成矿远景，并厘定了5片成矿远景区，即古宁浑迪、冲果勒浑迪、哈沙廷呼都格、安达特浑迪和那尔图远景区。     

华南花岗岩型铀矿成矿规律及成矿远景

花岗岩型铀矿是我国四大类型铀矿之一，它们主要集中分布于南岭中部的诸广一贵东地区，区内已发现数个花岗岩型铀矿田、数十个铀矿床，是我国花岗岩型铀矿最为重要的大型矿聚集区。花岗岩型铀矿在诸广、贵东岩体内的集中分布与区内富铀古陆块、深部构造环境、幔涌区强烈深源岩浆活动、挤压向拉伸转变的构造环境、富铀沉积建造及富铀岩体、多期次热液蚀变叠加、高低差异的放射性元素迁移、良好的还原条件和封闭环境等区域地质背景和条件有着十分密切的关系。从该区花岗岩型铀矿所具有的成矿规律和一系列有利于成矿的良好地质背景来看，该区乃至整个南岭范围地质背景相似的地区是铀成矿的有利地区，仍存在着寻找隐伏富大铀矿的巨大潜力。     

内蒙古北山重点成矿远景区主要地质特征与矿产资源潜力评价方向

本文根据北山地区区域地质背景、成矿地质条件及矿产分布特征,对北山地区初步划分出几个重点成矿远景区,建议作为今后进行区域固体矿产资源潜力评价的方向。     

广西铅锌矿矿源层探讨

矿源层是成矿作用的物质基础和必备条件。文章通过总结广西铅锌矿在各地层各地区的丰度值及已有矿床的资料，认为泥盆系、奥陶系、寒武系是广西铅锌矿的矿源层，并分析了矿质迁移富集条件。建议加大对此3个矿源层的研究，以促进广西铅锌矿找矿取得新突破。     

Hydrothermal Redistribution of Rare—Earth Elements in Pingxiang Dacite,Guangxi

Distribution of the rare-earth elements (REE) in dacite has been studied so as to get a better understanding of the migration behavior of REE during alteration. Both unaltered and altered samples were collected in an unpolluted area of Guangxi Zhuang Autonomous Region, southwest China. The REE concentrations were analyzed by ICP-MS. It is concluded that the REE were enriched during dacite alteration in varying degrees. The chondrite-normalized REE patterns of altered samples approximately maintain the characteristics of unaltered samples. However, if we normalize the REE concentrations of altered samples with unaltered dacite, fractionation of REE will appear. The LREE are more enriched than HREE in all altered samples with the LREE possibly precipitated as carbonate minerals. Both positive and negative Eu anomalies exist. Enrichment, immobility and depletion are noticed for the element Lu. Heavy mineral alteration, difference in stability constant between carbonate LREE and HREE complexes, downward migration of weathering fluid and microenvironment change may be responsible for the fractionation of REE in the altered dacite.     

安徽月山矿田夕卡岩型矿床形成的水岩作用

文章分析了安徽月山矿田夕卡岩型矿床形成过程中水岩作用的类型和特征.估算和讨论了水岩作用过程中的质量-体积变化和动力学问题.结论认为:水岩作用对流体成矿系统中夕卡岩和蚀变矿化作用的发生、发展,成矿流体的形成,成矿物质的富集,矿床定位等具有重要意义;水岩作用的水岩比值(W/R)小于0.1;夕卡岩和矿化蚀变分带是开放体系一系列溶解沉淀波反应前锋发生水岩反应后矿物和元素组合的时空分离的结果.     

河北省丰宁银矿外围金矿成矿条件分析

丰宁银矿外围是金矿新开发区。通过对地层、构造、岩浆岩及各金矿矿床特征的分析，提出了该区金矿成矿与燕山期岩浆活动有关，与银、铅、锌多金属矿成矿具有成因联系，是在统一地质作用下，同一成矿系列不同演化阶段的产物。在矿床分布上具有“南金、北银”特点。     

新疆昭苏水磨沟铜金矿特征

新疆西天山下石炭统大哈拉军山组地层中产有众多的金矿体。通过对照苏水磨沟铜金矿床矿化特征的研究，总结出这类矿床的成矿规律是：下石炭统大哈拉军山组中酸性火山岩是矿源层；区域性大断裂是矿质运移通道，其中的低级别、低序次构造为容矿空间；华力西期钾长花岗岩是形成铜金矿的能量来源；绿片岩相以下的动力变质作用是矿化富集的条件。矿床成因应属构造破碎蚀变岩型铜金矿床。