用户名: 密码: 验证码:
四川会理大铜矿铜矿床成因及找矿方向
详细信息    本馆镜像全文|  推荐本文 |  |   获取CNKI官网全文
摘要
会理大铜矿铜矿床是四川省重要的中型铜矿床之一,它位于川滇南北向构造带中段与南岭东西向构造带西延交接部位,处于康滇地轴中生代断陷盆地—会理盆地的南西侧。本文通过对大铜矿铜矿床区域地质背景、矿床地质特征等的地质资料收集、整理和野外实地地质调查等工作,并结合该铜矿床地球化学特征的研究,对大铜矿铜矿床的矿床成因有了进一步认识。
     会理大铜矿铜矿床产于中生代晚白垩世小坝组地层中,小坝组地层岩性为一套河湖相紫红色碎屑沉积岩。矿区主要褶皱构造为青蛙甲背斜和向斜,断层不发育,对矿体影响较小。矿体呈层状、似层状产出,产状与围岩基本一致。矿石主要原生金属矿物为辉铜矿和斑铜矿,次生金属矿物主要为孔雀石等。矿石结构构造比较简单,主要为结晶粒状及溶蚀结构和侵染状胶结构造。矿体围岩无明显蚀变现象。
     通过对该矿床地球化学特征研究表明,含矿围岩与矿体在常量元素、微量元素、稀土元素的组合上,具有相似的配分特征,显示它们具同源性,成矿物质主要来源于地层建造。矿石铅同位素组成反映其物质来源主要为壳源,而矿石硫同位素δ34S值为-13.3‰~﹢2.8‰,反映硫主要来自沉积物中的硫酸盐细菌还原作用和部分生物有机硫。流体包裹体研究表明低温低压条件下的成矿特征。
     除此之外,本文通过对该铜矿床成因的研究,还对大铜矿铜矿床的沉积相和成矿模式做了简要分析。本文认为该铜矿床是属于河流沉积相沉积,古河道凸岸的滨河床浅滩与成矿作用密切相关。铜元素的富集成矿作用主要发生在成岩中期—晚期。成矿环境为氧化向还原的过度环境。成矿期大体经历了沉积阶段、构造运动阶段和构造运动相对稳定阶段三个时期。成矿物质在后期的成岩作用过程中再度活化、转移、富集而成。
     综合研究显示,大铜矿铜矿床为一沉积砂砾岩型层控铜矿床。最后,本文根据对大铜矿矿床成因的认识,对大铜矿铜矿床的远景找矿指出方向。
The Huili Datongkuang copper deposit is one of the most important medium-sized copper deposits in Sichuan province. It is located between the middle of Sichuan and Yunnan tectonic zone and the West extension of Nanling east-west tectonic belt. In the Kangdian axis of the Mesozoic rift basin-southwestern side of the Huili Basin. Based on the geology information collection, collation and field geological investigation about the regional geological background, geological features of ore deposit in Datongkuang copper deposit, binding the researches of the geochemical characteristics of the copper deposits, this paper has a new light about the Datongkuang copper deposit.
     The Huili Datongkuang copper deposit produced in the Xiaobazu strata of late cretaceous in the Mesozoic, the Xiaobazu strata’s lithology is a set of stratigraphic about the fluvial and lacustrine facies mauve clastic sedimentary rocks. Datongkuang mining area’fold structures are mainly Qingwajia anticline and Qingwajia syncline. The faults are not developed, which have less impact on the orebody. The ore bodies occur as stratified oe stratoid basically concordant with the wall rock. The major primary metal minerals of ore are chalcocite and bornite, and the secondary metal minerals are malachite and azurite, etc. Ore texture and structure are simply, the ores are mainly in granular crystalline and dissolution textures and infection cementation structures. The ore rock has not significant altered phenomenon.
     Based on the research of the character of ore geochemistry characteristics, it indicates that ore-bearing wall rock and orebody’s macro elements, micro element and Rare-Earth Element have similar composition, which shows homology. Metallogenic materials are mainly from the stratigraphic formatiom. The components of lead isotopes reflect that the metallogenetic materials mainly come from the crust while theδ34S values range from -13.3‰to 2.8‰of ores indicate that sulfur was derived mainly from bacterial reduction of sulphates and bioaccumulation organic sulfur. Based on the study on the fluid-inclusion geochemistry of the ore deposit, it is suggested that the ore formed under the conditions of low temperature and low pressure.
     In addition, through the causes of the copper deposit, this paper made some brief analysis of the sedimentary pacies and metallogenic modle about the Datongkuang copper deposit. This text thinks that this copper deposit belongs to fluvial deposit. Old channel’s convex bank river bed accumulation had concentration with mineralization. The copper enrichment and mineralization in the mine field mainly occurs between the middle diagenesis and the late diagenesis, metallogenic environment was redox environment. Mineralization period experienced three major evolutionary stages: sedimentary stage, tectogenesis period and the relatively stable tectonic movement stage. The metallogenic material occursed mobilization, migration and enrichment in the later process of diagenesis again.
     Comprehensive studies on the analytical results indicate that the ore genesis of Datongkuang copper deposit is a sedimentary sandy gravel type stratabound deposit. In the end, according to the understanding of ore genesis about the Datongkuang copper deposit, this paper makes a suitability assessment of evaluation of mineral about the Datongkuang copper deposit.
引文
[1]西南地质勘查局601大队.四川省会理大铜厂铜矿勘探地质报告[R].西南地质勘查局601大队,1999.
    [2]华仁明.试论层状铜矿的三种主要成因模式[J].地质评论,1995,41(2):113-120.
    [3] Cox D P, Singer D A.eds.Mineral deposit models[J].U.S.G.S. Bulletin 1693,1986.
    [4] White C H. Notes on the origin of the Mansfeld copper deposits[J].Econ. Geol.,1942,37:64-68.
    [5] Garlick W G. Association of mineralization and algal reef structures on Northern Rhodesian copperbelt,Katanga and Australia[J].Econ.Geol.,1964,59:416-427.
    [6] Brown A C. An epigenetic origin for stratiform Cu-Pb-Zn sulfides in the lower Nonesuch shale,White Pine,Michigan[J].Econ.Geol.,1974,69:271-274.
    [7] Brown A C.层状铜矿床矿化时间[A].见:沃尔夫K H主编.层控矿床和层状矿床,第九卷[C].北京:地质出版社,1986,1-15.
    [8] Brown A C.Sediment-hosted stratiform cooper deposits:Deposit-type,name and related terminology[A]. In:Boyle R W et al.eds[C]. GAC Special Paper 36,1989,39-51.
    [9] Garlick W G. Genetic interpretation from ore relation to algal reefs in Zambia and Zaire[A]. In:Boyle R W et al.eds[C].A C Special Paper 36,1989,471-498.
    [10] Mendelsohn F. Central/southern African ore shale deposits[A]. In: Boyle R W et al.eds[C]. GAC Special Paper 36, 1989,453-469.
    [11] Sholkovitz E R. The flocculation of dissolved Fe,Mn,Cu,Ni,Co and Zn during estuarine mixing[J]. Earth Planet. Sci. lett.,1978,41:77~86.
    [12]王正方.长江口海域铜的地球化学初步讨论[J].地球化学,1990,(4):90-96.
    [13] Shankar R.Karbassi A R.Flocculation of Cu,Zn,Ni and Fe during the mixing of Mulki River water and Arabian Sea water,west coast of India[A]. In:Kharaka and Maest.Eds[C]. Water-Rocks Interaction,1992,565-568.
    [14] Fleischer V D,Garlick W G,Haldane R.赞比亚铜矿带地质[A].见:沃尔夫K H主编.层控矿床和层状矿床,第六卷[C].北京:地质出版社,1980,170-258.
    [15] Samama J C.关于砂岩型铜铅矿床成因的对比性评述[A].见:沃尔夫K H主编.层控矿床和层状矿床[C],第六卷.北京:地质出版社,1980,1-17.
    [16] Large D E.沉积岩中的海底喷出铅锌矿床—地质特征和成因评述[A].见:沃尔夫K H主编.层控矿床和层状矿床[C],第九卷.北京:地质出版社,1986,299-322.
    [17] Hutchinson R W, Spence C D, Franklin J M.eds.Precambrian sulfide deposits[J]. GAC Special Paper 25.791P.
    [18] Russell M J. Major sediment-hosted exhalative Zn-Pb deposits[A]. In:Sangster D F ed.Sediment-Hosted Stratiform Pb-Zn Deposits[C]. MAC Short Course Handbook 8,1983,251-282.
    [19] Briskey J A.Descriptive model of sedimentary exhalative Zn-Pb[A]. In:Cox and Singer eds.Mineral Deposits Models[C]. USGS Bulletin 1693,1986.211-212.
    [20] Eugster H P.Geochemical environments of sediment-hosted Cu-Pb-Zn deposits[A]. In:Boyle R W et al.eds[C]. GAC Special Paper 36,1989,111-126.
    [21] Joweet E C.Effects of continental rifting on the location and genesis of stratiform Cr-Ag deposits[A].In:Boyle R W et al.eds[C]. GAC Special Paper 36,1989,53-66.
    [22]沈建忠,韩发.电气石岩—一种和矿化有关的的岩石类型[J].矿床地质,1992,11(4):384-388.
    [23]葛朝华,韩发.广大大宝山矿床喷气-沉积成因地质地球化学特征[M].北京:北京科学技术出版社,1987.
    [24]韩发,Hutchinson R W.大厂锡多金属矿床热液喷气沉积成因证据—含矿建造及热液沉积岩[J].矿床地质,1989,8(2):25-40.
    [25]朱上庆,郑明华主编.层控矿床学[M].北京:地质出版社,1991.
    [26]夏学惠.内蒙狼山成矿带东升庙多金属硫铁矿床成矿特征及成因探讨[J].矿床地质,1992,11(4):374-383.
    [27]余金杰,杨海明,叶会寿.霍各乞铜多金属矿床的地质地球化学特征及矿质来源[J].矿床地质,1993,12(1):67-76.
    [28]涂光炽,等.中国层控矿床地球化学第一卷[M].北京:科学出版社,1984.
    [29]涂光炽.论改造成矿兼评现行矿床成因分类中的弱点[J].见中国科学地球化学研究所编.地球化学文集,北京:科学出版社,1986,1-7.
    [30]芮宗瑶.论某些层控铜矿交代分带[J].地质学报,1979,53(4):337-350.
    [31]刘宝珺,徐新煌,余光明.论铁铜层控矿床的岩相控制[J].见:国际交流地质学术论文集(3).北京:地质出版社,1980,43-48.
    [32]赖应篯.沉积物演化与某些层控矿床的形成[J].矿床地质,1988,7(1):42-53.
    [33]华仁明.东川式层状铜矿的沉积-改造成因[J].矿床地质,1989,8(2):3-13.
    [34] Rose A W . Mobility of copper and other heavy metal in sedmentary environment[A]. In:Boyle R W et al.eds[C]. GAC Special Paper 36,1989,71-110.
    [35]华仁明.论昆仑拗拉带[J].地质学报,1990,64(4):289-301.
    [36] Jowett E C . Gensis of kupferschiefer Cu-Ag deposits by convective flow of Rotliegende brines during Triassic rifting[J]. Econ. Geol., 1986, 81(8):1823-1837.
    [37]华仁明,阮惠础,刘燕,黄耀生.东川铜矿的碳氧同位素地质特征[J].桂林冶金地质学院学报,1988,8(1):57-62.
    [38] Hayes T S,Einaudi M T.Genesis of syngenetic sedimentary ore deposits[J].Soc,Min,Geol,Japan.1971,3:368-237.
    [39]涂光炽,等.中国层控矿床地球化学第三卷[M].北京:科学出版社,1988,1-36.
    [40]王秀璋,等.中国改造型金矿床地球化学[M].北京:科学出版社,1992,1-3.
    [41]谭凯旋,等.砂岩铜矿地球化学和成矿动力学[M].北京:地震出版社,1998.
    [42]冉崇英.康滇地轴层控铜矿床的成矿机理[M].北京:地质出版社,1988.
    [43]冉崇英.论滇中砂岩铜矿沉积、成岩、改造成矿机制[M].见《开拓·创新·奋进》.北京:中国科学技术出版社,1990,93-98.
    [44]冉崇英,刘卫华.康滇地轴铜矿床地球化学与矿床层楼结构机理[M].北京:科学技术出版社,1993.
    [45]王京彬,阮道源.河岭式酸性稀土火山岩系的演化特征与稀土富集[J].中国稀土学报,1989,7(2):38-71.
    [46]李朝阳.滇西地区陆相热水沉积成矿作用[J].铀矿地质,9(1):14-21.
    [47]徐―仁,张素华.不同成因观点在砂岩铜矿找矿中的应用和比较[J].浙江师大学报(自然科学版),1996,19(3):98-103.
    [48]廖文,喻国栋,于子箴.四川大铜厂表生硫化物铜矿床成因探讨[J].矿物岩石地球化学通报,2004,13(1):45-51.
    [49]刘家铎,等.扬子地台西南缘成矿规律即找矿方向[M].北京:地质出版社,2004,1.
    [50]四川省冶金地质勘探公司601队.大铜厂含铜砾岩、砂岩矿床基本特征及初步认识[A].见地质科学研究院地质矿产所编.铁铜矿产专辑第二集[C].北京:地质出版社,1974:104-113.
    [51]周家云.四川会理拉拉铜矿地球化学特征及其大陆动力学背景[D].成都理工大学,2008.
    [52]李复汉.康滇地区的前震旦系[M].重庆:重庆出版社,1988,31-73.
    [53]刘肇昌,李凡友,钟康惠,等.扬子地台西缘构造演化与成矿[M].成都:电子科技大学出版社,1996,48-100.
    [54]攀西地质大队.四川省会理县拉拉铜矿床详细勘探地质报告[R].成都:四川省地质矿产局,1984:12-128.
    [55]潘杏南,等.康滇构造与裂谷作用[M].重庆:重庆出版社,1987.
    [56]肖荣吾.康滇大陆古裂谷带特征及其演化[J].云南地质,19887(3):229-244.
    [57]吕慧进,徐一仁,张素华.四川会理红盆爱国—弯子村铜矿床控矿因素分析[J].西安地质学院学报,1995,17(3):43-47.
    [58]徐一仁,张素华.会理盆地砂岩铜矿成矿带的划分—兼论而论找矿前景[J].浙江师大学报(自然科学版),1995,18(2):61-67.
    [59] Taylor.S.R,McLenan.S.M.The Continental Crust: Its Composition and Evolution [M].Blackwell Scientific Publication,Ox-ford,1985,1-312.
    [60] Murray R W.Rare earth elements as indicators of different marine depositional environment in chert and shale [J]. Geology, 1990, 18:268-271.
    [61]方爱民,李继亮,侯泉林,刘小汉,肖文交,俞良军,周辉.新疆西昆仑库地复理石源区性质及构造背景分析[J].岩石学报,2003,19(1):153-166.
    [62]陈德潜,陈刚.实用稀土元素地球化学[M].北京:冶金工业出版社,1990.
    [63]温春齐,多吉.矿床研究方法[M].成都:四川科学技术出版社,2009.
    [64] Zartman R E, Doe B R. Plumbotectonics-The model[J]. Tectonophysics,1981,75(1/2):135-162.
    [65]宜昌地质矿产研究所.铅同位素地质研究的基本问题[M].北京:地质出版社,1979,59-61.
    [66]温春奇,曹志敏,李保华等.四川大水沟碲矿床成矿物质来源研究.成都理工学院学报,2002,29(5):526-532.
    [67]卢焕章,李秉伦,沈崖,赵希潡,喻铁阶,魏家秀.包裹体地球化学[M].北京:地质出版社,1990.
    [68]徐一仁.四川会理砂岩型铜矿成矿条件及勘探中应注意的问题[J].四川地质学报.1990.10(1).15-22.

© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号

地址:北京市海淀区学院路29号 邮编:100083

电话:办公室:(+86 10)66554848;文献借阅、咨询服务、科技查新:66554700