重熔斑岩型锡多金属矿床地质特征及成矿模式

对重熔斑岩型锡多金属矿床成矿岩体的岩石类型、岩体形态、规模、岩石化学、微量元素和稀土元素地球化学、矿物包裹体和稳定同位素地球化学特征等方面进行了较系统的研究;并对该类矿床的矿化、蚀变分带特征和矿化与蚀变带的关系作了论述,指出了该类矿床最重要的蚀变带为黄玉云英岩化带, 在详细研究该类矿床的基础上,建立了重熔斑岩型锡多金属矿床的成矿模式.     

内蒙古小东沟钼多金属矿床地质特征

阐述了小东沟钼多金属矿床的矿体、矿化蚀变、硫同位素等地质特征，初步确定成矿物质来源于深源岩浆。矿床属于与燕山早期晚阶段小东沟花岗岩体有关的斑岩型钼矿床—中低温铅锌矿床。     

湖南郴州荷花坪锡多金属矿床地质特征

分析总结区内地层、构造、岩浆岩与矿床的关系,矿区有利赋矿层位为中泥盆统棋梓桥组底部不纯灰岩,NE向成矿构造发育,燕山期花岗质岩浆活动强烈,成矿地质条件非常有利。将荷花坪锡多金属矿床类型分为矽卡岩—锡石硫化物型、破碎带蚀变岩型、蚀变花岗斑岩型三种,其中泥盆统棋梓桥组底部不纯灰岩中的似层状矽卡岩—锡石硫化物型矿床规模巨大,找矿前景非常可观。     

长坡区锡多金属矿床地质特征与成矿条件分析

长坡区锡多金属矿床位于大厂锡多金属矿田的西矿带,它是在地层、断裂构造和岩浆岩“三位一体“作用下形成的,地层是基础条件,断裂构造起了主导作用,岩浆提供热源以及可能提供了液源甚至矿质.因此,今后找矿中,更应关注断裂构造的研究.     

长坡区锡多金属矿床地质特征与成矿条件分析

长坡区锡多金属矿床位于大厂锡多金属矿田的西矿带，它是在地层、断裂构造和岩浆岩“三位一体”作用下形成的，地层是基础条件，断裂构造起了主导作用，岩浆提供热源以及可能提供了液源甚至矿质．因此，今后找矿中，更应关注断裂构造的研究。     

湖南锡田钨锡多金属矿床成矿地质特征及成矿模式

通过对锡田钨锡多金属矿床地质特征的研究,认为锡田矿区钨锡多金属矿体的形态、产状及空间展布严格受岩体接触带及断裂构造控制;矿床类型主要为矽卡岩型,其次为破碎带蚀变岩型、云英岩型等;钨锡多金属成矿作用与岩浆活动密切相关:印支期花岗岩浆侵位形成矽卡岩型钨锡矿(化)体;燕山期花岗岩浆侵位导致早期矿化矽卡岩发生叠加矿化,同时在构造破碎带中形成云英岩型锡矿或破碎带蚀变岩型钨锡多金属矿体,是形成规模巨大的钨锡多金属工业矿床的必要条件.此外,提出了锡田矿区钨锡多金属矿的成矿模式.     

陕西金堆城斑岩钼矿床地质特征及成因探讨

金堆城花岗斑岩在燕山期侵位于元古代熊耳群变细碧岩中,按其岩石化学特征应属高硅富钾的钙碱性系列岩石。钼矿化发育于斑岩体及其外接触带内,矿体由含钼石英细网脉组成,最大矿化深度约达1000m。围岩蚀变自斑岩体向外为:钾化、绢(云)英岩化→硅化→青磐岩化,其中以硅化最为强烈且与钼矿化关系最密切。气液包裹体与含子矿物多相包裹体常常共存,主要成矿温度为300—400℃。硫、氧和碳同位素特征表明,主要成矿阶段的成矿流体是以岩浆水为主的混合液,硫、钼主要来源于花岗岩浆。低f_(o2)、高f_(s2)的弱酸性还原条件以及成矿流体沸腾是辉钼矿沉淀的主要因素。矿床成因类型属斑岩型中高温热液钼矿床。     

甘肃公婆泉斑岩铜矿地质特征及形成机制

在阐述公婆泉斑岩铜矿地质特征基础上，从成矿物质来源、铜的富集与成矿机理等方面探讨该斑岩铜矿的形成机制，得出一些新的认识。     

龙门山铜矿床地质特征与成矿控制因素

龙门山铜矿为一赋存于月山岩体内部的矽卡岩矿床,由一个中等规模的透镜状矿体和多个小矿体群组成。成矿母岩属燕山早期石英闪长岩-闪长岩体,成矿围岩以中三叠统白云岩、膏盐层和下三叠统薄层灰岩为主。主要控矿构造有三种类型:①“舌状体”构造(主矿体控矿构造);②向斜构造(浅部围岩中顺层产出的小矿体控矿构造);③压扭性构造裂隙(岩体中小矿脉控矿构造)。矿床的成矿作用分为三期六阶段和两个亚阶段,其中石英硫化物期的早硫化物阶段是主要成矿阶段。常见金属矿物共生组合有四组,代表了从氧化物阶段至表生期的成矿演化过程。成因类型为接触交代矽卡岩型富铜矿床。     

新疆东戈壁斑岩型钼矿床之斑岩体特征

新疆东戈壁斑岩型钼矿床位于哈密市南110 km,为荒漠戈壁区,隶属于东天山觉罗塔格多金属成矿带。钼矿体赋存于斑状花岗岩体的外接触带浅变质碎屑岩中;侵入岩主要有浅肉红色斑状花岗岩(隐伏岩体)、花岗斑岩脉、细粒花岗岩脉三种,控矿岩体为隐伏斑状花岗岩,属华力西晚期第二次侵入。本文对东戈壁矿区岩体的岩石学、岩石化学、岩石地球化学特征进行了较详细研究,并与国内的斑岩型钼矿岩体的岩石化学、岩石地球化学特征进行了对比,其主要结论是东戈壁矿区斑状花岗岩SiO2含量偏高,属钙碱性岩,侵入岩成因分类属陆壳重熔S型花岗岩。该矿床为新疆发现的第一个特大型钼矿床,此项研究对在区域上寻找同类型矿床具有重要的借鉴意义。     

一个铀钨矿床的成矿地质条件及成因特征

至今,在国内外已发现的单铀或单钨的脉状矿床或层控矿床为数不少,但铀钨均具工业意义的铀钨(沥青铀矿-白钨矿)组合的矿床却极其少见。本文介绍了一个这样的矿床的成矿地质条件及成因特征:该矿床的形成受花岗岩、地层、岩相、构造、地下水及区域地球化学环境的联合控制;从矿石建造和有用元素组合角度看,这是一个矿床新类型,从成因上看,是花岗岩型热液矿床与层控矿床之间的过渡类型。     

中国有色金属工业总公司矿产地质研究院

The Changpo tin-polymetallic deposit occurs in the Upper Devonian marine carbonate rocks and silicious rocks and is controlled jointly by three factors, i.e., strata (D3), structures and magmatic rocks, bearing dual characteristics of the syndepositional deposit and hydrothermal one. According to modes of occurrence and mineral assemblages, it can be divided into two types of mineralizations: stratiform stanniferous sulfides and veinlike cassiterite-sulfides. The former has such characteristics of sedimentary deposits as being controlled by the strata, and possessing typical syndepositional structure, e. g., striped and laminated structure, as well as less developed wall rock alterations. In contrast, veinlike mineralizations are characterized by features of hydrothermal deposits, such as being governed by fracture systems and affected by tectonic activities, showing polystage pulsation and having typical hydrothermal wall rock alterations including sericitization, tourmalinization and fluoritization. The two types display distinct differences not only in geological characteristics, but also in mineral assemblages, metallogenic physical-chemical conditions and temperatures as well as ore-forming time. Nevertheless, there exist close relations between the two mineralizations: (1) they occur in the same spatial position; (2) they have similar vertical mineral zoning: pyrite in the upper part of the orebody and pyrrhatite in the lower; (3) δ34S values of pyrite and sphalerite are similar in the two types, being -4.5‰ - +1.3‰ in the pyrite and -7.1‰ - +0.2‰ in the sphalerite respectively. All this implies that these two mineralizations have intimate relationships and also obvious differences. On the one hand, they were formed in different ore-forming stages and diverse geological conditions; on the other hand, the stratiform mineralization was- superimposed and remolded by the late ore-forming hydrothermal fluids, i. e., veinlike mineralization, whose material sources in turn had something to do with the stratiform mineralization. Studies show that the stratiform mineralization is of sea-floor syndepositional type formed in Late Devonian whose formation was probably related to the eruptive sedimentation of the volcanic hot spring ascending along the deep-seated fractures. The metallogenic elements such as S, Sn, Pb and Zn were derived from the depth of the crust, and the veinlike mineralization resulted from the hydrothermal liquid of Yanshanian granitic magma. Under the action of the magmatic solution and the heat of the magma, the metallogen materials in the stratiform mineralization were activated and transported, and thus provided some ore-forming materials for veinlike mineralization, such as S, Sn, Pb and Zn. It is therefore concluded that the Changpo ore deposit is a composite-origin type formed both by syndeposition, i.e., eruptive deposition from volcanic hot spring at seafloor, and by superimposition-reformation of the magmatic hydrothermal fluids, and that this deposit must have evolved from the stratiform stanniferous sulfide mineralization.     

山西支家地银矿地质特征及矿床成因

支家地银矿系产于火山岩-次火山岩中,属浅成中低温热液型银矿床。研究了银矿的地质特征、微量元素、稳定同位素和包裹体地球化学特征,探讨了成矿的控制因素和物理化学条件及矿床成因,建立了成矿模式。     

金堆城超大型斑岩钼矿床地质特征及其找矿新发现

金堆城超大型钼矿床处于华北地台南缘豫西断隆区,与石家湾、大石沟、文公岭、秦岭沟等钼矿床同处于老牛山岩体外接触带之金堆城-黄龙铺钼矿田内.矿床形成与区内多组构造及斑岩体具有密切关系.矿体形态与岩体形态基本一致,只是随着远离岩体,矿体形态具分枝现象,矿石品位有由富变贫的趋势.远离岩体600m后,围岩中基本不再含矿,但外围会出现一些铅(银)矿体及金矿体,矿床具有典型的斑岩型钼矿成矿模式.对该矿床在纵向、横向上地质特征的研究,对老牛山岩体外接触带其他钼矿床在深部找矿方面取得突破具有一定的指导意义.     

内蒙古敖仑花斑岩型钼铜矿床地质特征及成因探讨

敖仑花钼铜矿床是近年来新发现的大型斑岩型钼铜矿床,该矿床钼铜矿化多产于敖仑花岩体内及外接触带的角岩中,矿化类型主要为细脉浸染状。矿石矿物为辉钼矿、黄铜矿、黄铁矿、闪锌矿、方铅矿等。敖仑花岩体为中酸性的花岗闪长斑岩体,岩石SiO2、Al2O3、K、Na含量较高,Na2O/K2O比值在1.1～2.1之间,σ值在3～3.7之...     

Geological Characteristics and Metallogeny of Qiushuwan Porphyry Type Cu-Mo Deposit in East Qinling

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