燕辽地区火山热液型铀－金－多金属矿床成矿特征

燕辽地区位于华北地台北缘东段，是我国著名的中生代火山热液型铀、金、多金属矿床成矿区。研究结果表明，其成矿作用受统一的晚中生代大陆裂陷火山岩浆活动控制；成矿时代集中在晚侏罗世及早白垩世；成矿介质为火山岩浆水、变质水和大气水混合的中温、中低温火山热液；成矿物质主要来自富集型的上地幔及下地壳。     

211地区铀矿床的稳定同位素地球化学特征

本文在讨论了 2 11地区花岗岩型铀矿床的稳定同位素组成的基础上 ,提出该区铀成矿热液可能主要来自晚期花岗岩浆 ,部分来自大气降水     

毛登锡铜矿床成矿分带及其成因讨论

毛登矿主档是产于花岗斑岩内，外接触带的热液脉型锡铜矿床在容矿构造、矿脉类型及矿石类型、金属矿物组合及主要金属矿物标型，热液蚀变及元素地球化学等诸方面，自花岗斑岩向外，显示出明显的顺向（侧向）脉动分带。     

西秦岭铀矿床含矿热液物理化学条件改变对铀沉淀影响

本文研究了西秦岭铀矿床含矿热液物理化学条件的改变对铀沉淀富集的影响。研究表明，铀在相对还原条件下迁移，而在相对氧化条件下沉淀富集。铀的沉淀富集主要发生在含矿热液的温度、压力和氧逸度大幅度降低，酸性增强及氧化－还原电位增高的物理化学条件下。     

A Study on the Geological—Geochemical Dynamics of Hydrothermal Ore Deposition as Exemplified by the Muping—Rushan Gold Deposit Belt,Eastern Shandong,China

This paper presents a method of establishing a hydrothermal ore-forming reaction system.On the basis of the study of four typical hydrothermal deposits,the following conclusions concerning geochemical dynamic controlling during hydrothermal mineralization have been sions concerning geochemical dynaamic controlling during hydrothermal mineralization have been drawn:(1)The regional tectonic activities control the concentration and dispersion of elements in the ore-forming process in terms of their effects on the thermodynamic nature and conditions of the ore-forming reaction system.(2)During hydrothermal mineralization the activites of ore-bearing faults can be divideb into two stages:the brittle splitting stage and the brittle-tough tensing stage,which would create characteristically different geodynamic conditions for the geochemical thermodynamic ore-forming system.(3)The hydrothermal ore-forming reaaction system is an open dynamic system.At the brittle splitting stage the system was so strongly supersaturated and unequilibrated as to speed up and enhance the crystallization and differentiation of ore-forming fluids.And at the brittle-tough tensing stage,the ore-forming system was in a weak supersaturated state;with decreasing temperature and pressure the crystallization of oreforming material would show down,and it can be regarded as an equilibrated state.(4)In the lates stages of hydrothermal evolution,gold would be concentrated in the residual ore-forming solution.The pulsating fracture activite in this stage led to the crush of pyrite ore and it was then filled with gold-enriched solution,forming high-grage“fissure”gold ore.This ore-forming process could be called the coupling mechanism of ore formation.     

热液矿床石英铅同位素组成及其地质意义

作者以若尔盖铀矿床为例，研究了含矿热液形成的石英脉石英的铅同位素组成，并将其作为联系母源铅同位素组成的桥梁，判别铀的来源。结果表明，矿床中石英铅同位素组成与含矿黄铁矿和中酸性构造－岩浆成因的花岗岩铅同位素组成具线性演化关系。由此提出含矿热液中的铀来自中酸性构造－岩浆岩而不是地层岩石的新见解，同时提出利用热液石英铅同位素组成判别非放射性矿床成矿元素来源的可能性。     

关于银山矿床成矿作用的几个问题——兼与《江西银山铜铅锌金银矿床》的作者商榷

银山多金属矿床是一个特大型火山—潜火山热液矿床,具有复杂的多期多阶段的成矿作用和有序的成矿分带。成矿作用主要为火山—潜火山热液作用,但在此之前,还经历了一期由韧脆性剪切带形成而引起的动力变质热液作用。根据矿体与3个旋回潜火山岩体的时空关系,火山—潜火山热液成矿作用又可分为两个成矿期和5个成矿阶段。矿床地质地球化学研究表明成矿作用在空间上具有定向迁移的特点,结合流体动力学计算机数值模拟认为定向迁移的根本原因是构造岩浆脉动和隐伏岩体形态产状。笔者认为,矿区深部可能有隐伏岩体,但对隐伏的斑岩铜矿床不应抱很大希望     

Mineralization Ages of the Jiapigou Gold Deposits,Jilin

The Jiapigou gold deposits are typical vein type deposits associated withArchaean greenstone belts in China. According to the crosscutting relationships between dykesand auriferous veins, single hydrothermal zircon U-Pb dating and quartz K-Ar,~(40)Ar-~(39)Ar andRb-Sr datings, the main mineralization stage of the Jiapigou deposit has been determined to be2469-2475 Ma, while mineralization superimposition on the gold deposit occurred in1800-2000 Ma and 130-272 Ma. They form a mineralization framework of one oldermetallogenic epoch (Late Archaean-Early Proterozoic) and one younger metallogenic epoch(Mesozoic) of gold deposits in Archaean greenstone belts in China.     

Yixunite and Damiaoite—A Twin of New Native Alloys of Indium and Platinum from the Yanshan Mountains

Yixunite and damiaoite Were found in a cobalt- and copper-bearing platinum ore vein of a contact metasomatic deposit. The chief ore minerals are bornite, chalcopyrite, magnetite and carrollite. The platinum minerals include moncheite, sperrylite, daomanite, cobalt malanite and cooperite. Yixunite and damiaoite occur as immiscible globules, 1.0 to 2.0 mm in diameter. Yixunite is always in the central part of a globule. It is opaque with metallic lustre, bright white colour and black streak. HM = 5.8; VHN50 = 634 kg/mm2 (573-681 kg/ mm2); insoluble in HCl, HNO3, HF or H3PO4; no cleavage; no magnetism. Density is hard to measure because of small grain size. Calculated density = 18.21 g/cm3. Reflective colour is bright white with a yellowish tint. Isotropic. The mean analytical results (ranges) (%) are: Pt 82.8 (81.8-83.6), In 16.4(15.6-17.1) and total 99.2. The empirical formula (based on 4 atoms) is Pt2.993 In1.007 . The five strongest lines of X-ray diffraction (hkl, d,I) are 111, 2.30 (100); 200, 1.99 (