锡铁山矿床两类喷流沉积成因的铅锌矿体研究   总被引：9，自引：0，他引：9  

祝新友  邓吉牛  王京彬  林龙军  樊俊昌 《矿床地质》2006,25(3):252-262

锡铁山大型铅锌矿床发育有非层状和层状两种类型的铅锌矿体,通过对两类矿体产出地质条件与地球化学特征的研究,发现非层状矿体分布于代表喷口系统的网脉状蚀变带的上方附近,其中发育有大量的热水爆破角砾岩,而层状矿体分布于远离喷口的外侧,属于远端沉积的产物。两者具有相同的矿物组合和成矿元素组合,自非层状矿体→层状矿体,矿石品位下降,Zn/Pb比值增高,黄铁矿相对含量增加。揭示出非层状矿体不是层状矿体后期改造的产物,而是形成于喷流作用阶段。考虑到锡铁山矿床中规模巨大的喷口系统以及厚层状的喷流成因大理岩,推断锡铁山矿床及周边地区还有巨大的找矿潜力,找矿重点是层状铅锌矿床(体)。  相似文献   

内蒙东七一山碱长花岗岩及其成矿作用   总被引：1，自引：0，他引：1  

王勇 《地质学报》2009,83(10):1505-1514

碱长花岗岩在国内外普遍以含多金属元素、特别是稀有金属矿化为特征,该类矿化岩体在我国多分部在华南褶皱系,而产出在内蒙西部的东七一山碱长花岗岩是我国北方地区少见的一个大型稀有金属矿化体,由于前人工作不多,对其认识较浅。本文在前人工作基础上,对其岩石学、成矿学及成岩、成矿机制等方面做了较多细致、深入的工作,表明该岩体是一个壳源岩浆直接分异演化而成的碱长花岗岩体,岩体除铷含量较高外,其中的铌－钽也有很高的利用价值,碱长花岗岩还是钨、锡、铍资源的源泉,同时派生出的大型萤石矿和文石－方解石矿产也有很高的经济价值,从而大大提高了对东七一山碱长花岗岩成岩、成矿实践和理论认识,这对在区域上扩大与这类岩体有关的找矿工作具有重要指导意义。  相似文献   

地质界面控矿原理及其运用要点   总被引：1，自引：0，他引：1  

张善明  吕新彪  邓国祥  周喜 《地质科技情报》2009,28(6)

地质界面成矿现象普遍存在,从成矿作用的角度看,控矿地质界面可分为3类:成矿地质条件变化界面;成矿要素性质演化界面;矿体形成界面。地质界面的控矿原理在于:界面两侧异相差异因素为成矿提供了动力;界面附近构建的特殊过渡态为成矿提供了特定的环境;界面对应的成矿时间是最佳成矿期;界面物理化学效应促进了成矿作用的进行。运用地质界面控矿原理进行找矿预测,关键是准确识别并定位地质界面,研究其性质并理解其控矿作用,并融合其他成矿理论进行综合分析,同时注意地质界面控矿在地质异常解释中的运用。  相似文献   

Analysis of the ore-controlling structure of the Shihu gold deposit, Hebei Province and deep-seated ore-prospecting prediction   总被引：1，自引：1，他引：0  

Shuyin Niu  Baode Wang  Aiqun Sun  Chao Chen  Zili Wang  Baojun Ma  Wenxue Wang  Xiaoping Jiang  Yongli Zhao  Yincang Gao  Huabin Liu  Jianping Qiu 《中国地球化学学报》2009,28(4):386-396

Under the guidance of the theory of mantle-branch structure-associated metallogenesis and on the basis of the geological characteristics, analysis of the ore-forming and ore-controlling structures, the geochemical characteristics of metallogenesis, the source of ore-forming materials, changes in the physical and chemical conditions of metallogenesis, changes in the vertical width of ore veins, and changes in gold grade of the Shihu gold deposit, the mechanism of its metallogenesis was discussed and the rules of vertical variation of ore veins were summarized in this study. It is pointed out that the orebodies under exploitation at present time should be in the middle and upper portions of gold veins in the Shihu gold mining district. Particularly on the basis of the characteristics of mantle-branch structure-associated metallogenesis, it is indicated that metallogenesis is controlled mainly by such ore-forming conditions as temperature and pressure. Deep-seated ore-forming fluids are characterized mainly by injection and precipitation. So the vein bodies in the adjacent metallogenic structures are of obvious comparability, and there would be great prospects for ore search both at depth and in the periphery of the Shihu gold deposit. Therefore, ore prospecting should be strengthened both at depth and in the peripheries.  相似文献   

汪清县闹枝火山岩型金矿地质特征   总被引：2，自引：0，他引：2  

程明华  薛兴岩  李伟龙 《吉林地质》2009,28(1):25-27

闹枝金矿床是吉林省东部中生代火山岩型金、多金属成矿带中典型矿床之一。本文论述该矿床成矿地质背景和矿床地质特征,综合分析了矿床成矿地质作用及成矿机理。  相似文献   

Metallogenesis related to Mesozoic Granitoids in the Nanling Range, South China and Their Geodynamic Settings   总被引：3，自引：0，他引：3  

HUA Renmin  CHEN Peirong  ZHANG Wenlan  YAO Junming  LIN Jinfu  ZHANG Zhanshi  GU Shengyan  LIU Xiaodong  QI Huawen State Key Laboratory for Mineral Deposit Research  Nanjing University  Nanjing  Chin 《《地质学报》英文版》2005,79(6):810-820

Affected by the compressive stress from the South-Central （Indo-China） Peninsula, the Indosinian orogenesis, characterized by collision, thrust and uplifting, took place inside the South China Plate during 250-230 Ma. The ages of the Indosinian granitoids in the Nanling Range and vicinity areas are mostly 240-205 Ma, indicating that they were emplaced in both late collision and post-collision geodynamic environments. No important granite-related metallogenesis occurred in this duration. A post-orogenic setting started at the beginning of the Yanshanian Period, which controlled large-scale granitic magmatism and related metallogenesis. This paper makes the first attempt to divide the Yanshanian Period into three sub-periods, i.e. the early, middle and late Yanshanian Periods, based mainly on the features of magmatism, especially granitoids and related metallogenesis and their geodynamic environments. The magmatic association of the Early Yanshanian （about 185-170 Ma） comprises four categories of magmatism, i.e. basalt, bimodal volcanics, A-type granite and intraplate high-K calc-alkaline （HKCA） magmatism, which indicates an extension-thinning of lithosphere and upwelling of mantle material to a relative small and local extent. Pb-Zn, Cu and Au mineralizations associated with HKCA magmatism represents the first high tide of Mesozoic metallogenesis in the Nanling Range area. During the middle Yanshanian, the lithosphere was subjected to more extensive and intensive extending and thinning, and hence mantle upwelling and basaltic magma underplating caused a great amount of crust remelting granitoids. This period can be further divided into two stages. The first stage （170-150 Ma） is represented by large-scale emplacement of crust remelting granites with local tungsten mineralization at its end. The second stage （150-140 Ma） is the most important time of large-scale mineralizations of non-ferrous and rare metals, e.g. W, Sn, Nb-Ta, Bi, Mo, Be, in the Nanling Range area. The late Yanshanian （140-65 Ma） was generally characterized by full extension and breakup of the lithosphere of South China. However, owing to the influence of the Pacific Plate movement, the eastern part of South China was predominated by subduction-related compression, which resulted in magmatism of calc-alkaline and shoshonite series and related metallogeneses of Au, Ag, Pb-Zn, Cu and （Mo, Sn）, followed by extension in its late stage. In the Nanling Range area, the late Yanshanian magmatism was represented by granitic volcanic-intrusive complexes and mafic dikes, which are genetically related to volcanic-type uranium and porphyry tin deposits, and the mobilization-mineralization of uranium from pre-existing Indosinian granites.  相似文献   

冀东-辽西主要金矿矿集区地质特征的差异性与成矿作用的统一性探析   总被引：2，自引：0，他引：2  

贾三石  王恩德  付建飞  宋建潮  席晓凤 《地质学报》2011,85(9):1493-1506

通过对燕辽成矿带东段冀东-辽西金矿床基础地质地球化学资料分析,结合区域构造演化和成矿时间及其分布空间的特异性,认为冀东-辽西金矿成矿物质具有相同的深来源特征,由于具体的构造背景不同而表现出矿床类型和就位空间的差异性,提出了燕辽裂陷槽是冀东-辽西金矿床空间分布的诱因,并提出冀东-辽西金成矿演化分为陆陆碰撞拼贴期(4.5～...  相似文献   

西藏尤卡朗铅银矿床成矿作用初步研究   总被引：3，自引：0，他引：3  

冯志兴  吕新彪  王涛 《矿床地质》2011,30(3):469-476

西藏尤卡朗铅银矿床产于中侏罗统拉贡塘组受岩浆热变质的砂泥质岩中,与矿区北部出露的燕山期至喜马拉雅期中酸性侵入岩体有关.矿体的产出和分布受到北北东向断裂构造的控制,尤其是多期活动的节理造成局部矿化富集.成矿作用可划分为5个阶段,包括石英菱铁矿阶段、铅锌(银)矿化阶段、细粒铅银矿化阶段、黄铁矿化阶段和石英脉阶段.矿石中硫化...  相似文献   

同位成矿概论   总被引：15，自引：9，他引：15  

梅友松  汪东波 《地质与勘探》1995,31(5):3-14

同位成矿是指在同一空间范围内，同时代与不同时代，同矿种与不同矿种，同类型与不同类型相对稳定的成矿作用及其成矿规律的总称。提出了同位成矿是大型一超大型金属矿术（矿田）形成的宏观机制，讨论了同位成矿的边界条件，只有在边界条件以内才有可能形成大矿；阐述了同位成矿的某些特点；划分了同位成矿的类型。并指出同位成矿可能与幔流柱活动密切相关。  相似文献   

西秦岭南亚带硅灰泥岩型金矿床的同位素地质学研究   总被引：1，自引：0，他引：1  

周德安 《地质与勘探》1995,31(5):36-42

西秦岭南亚带硅灰泥岩型金矿是我国近年来发现的一种新的很有前景的金矿类型。简要地介绍了矿床地质特征，系统地叙述了金矿床的矿物、矿石和岩石硫、氧、铅、碳、硅同位素和矿物包裹体同位素的组成特点，提出了对本区金矿成矿主要矿来源、介持性、成矿年龄及矿床成因等的认识。  相似文献