云南个旧超大型锡铜矿区变碱性苦橄岩类特征与大陆动力学

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英文篇名：Characteristics of the Alkaline Picritic Volcanic Rocks in the Gejiu Superlarge Tin-Copper Deposit and their Continental Dynamic Implications 作者：方维萱 ; 贾润幸 英文作者：FANG Weixuan1 ; 2 and JIA Runxing1 ; 3(1.Beijing Institute of Geology for Mineral Resources ; Beijing 100012 ; China ; 2.Sinotech Mineral Exploration Co. ; Ltd ; Beijing 100012 ; China ; 3.Beijing Donia Resources Co. ; Ltd. Beijing 100012 ; China) 关键词：大陆动力学 ; 超基性火山岩 ; 弧后盆地 ; 个旧 英文关键词：continental dynamics ; ultrabasic volcanic rocks ; backarc basins ; Gejiu 刊名：大地构造与成矿学 英文刊名：Geotectonica Et Metallogenia 出版日期：2011-02-15 出版单位：大地构造与成矿学 机构：北京矿产地质研究院;中色地科矿产勘查股份有限公司;中色金地资源科技有限公司; 年：2011 期：01 基金：危机矿山元素综合查定和可行性评价技术(编号 ; 2008EG115074) 基金：科技部科研院所技术开发研究专项资金资助 CN：44-1595/P ISSN：1001-1552 页：139-150 页数：12 分类号：P541;P588.14 语种：中文; 文件大小：1366K

摘要

通过对个旧超大型矿床中变质火山岩岩石矿物和地球化学的研究,该区与铜锡成矿关系密切的火山岩主要为高钛碱性超基性火山岩系列,岩石组合主要有碱性苦橄岩、碱性苦橄质玄武岩和碧玄岩等。大多数样品中SiO2含量变化范围为34.62%~44.73%,K2O+Na2O含量在2.99%~7.15%,TiO2含量变化范围为1.83%~4.0%,平均含量为3.07%;富集Nb、Ta、Zr、Hf等高场强元素,Nb含量变化范围为24.9~98.1μg/g;稀土元素表现为平滑右倾的稀土配分模式,δCe和δEu异常不明显。上述特征与洋岛碱性玄武岩类似,结合相邻地区的构造特征看,个旧三叠纪沉积盆地原型盆地属于弧后裂谷盆地,这种弧后裂谷盆地对于大型-超大型块状硫化物矿床的形成是十分有利的成矿地质背景和条件。
        The Gejiu superlarge tin polymetallic deposit is located in the southeastern part of Yunnan Province,China,which comprises five separate orefields:the Malage,Songshujiao,Gaosong,Laochang and Kafang orefields. The pre-Triassic and Early Triassic sedimentations were marine source predominated,and shifted to terrestrial source dominated after Early Triassic. Multiple periods or stages of magmatic activities ranging from Proterozoic to Cenozoic along with main tectonic movements were recorded in the area. This paper reports the petrological and geochemical characteristics of the Triassic volcanic rocks which are closely related to the tin and copper mineralization in the Gejiu area. The volcanic rocks,which consist mainly of alkaline picrite,alkaline picritic basalt and basanite,are of alkaline ultrobasic with high content of titanium. The rocks are characterized by SiO2=34.62%~ 44.73%,K2O+Na2O=2.99%~7.15%,TiO2=1.83%~4.0%,high HFSE contents. The chondrite normalized REE patterns are smooth right-dipping lines without significant Eu and Ce anomalies,which are similar to those of the typical oceanic island basalt (OIB). Considering the rigional tectonic settings,the Triassic sedimentary basin in the Gejiu area was a backarc rift basin which was a favourable site for the formation of large-superlarge massive sulfid deposit.

引文

陈翠华,何彬彬,顾雪祥,刘建明.2003.右江盆地中三叠统浊积岩系的物源和沉积构造背景分析.大地构造与成矿学,27(91):77-82.
    董云鹏,朱炳泉,常向阳,张国伟.2002.滇东师宗-弥勒带北段基性火山岩地球化学及其对华南大陆构造格局的制约.岩石学报,18(1):37-46.
    方维萱,胡瑞忠,高振敏.2001.扬子地块南缘及邻区大陆动力成矿系统、成矿系列特征与找矿方向.矿物学报,21(4):561-570.
    方维萱,胡瑞忠,苏文超,蒋国豪.2000.初论特提斯构造域一些大型-超大型金属矿床集中区聚矿构造.矿物岩石地球化学通报,19(4):409-413.
    方维萱,胡瑞忠,谢桂青,苏文超.2002.云南哀牢山地区构造岩石地层单元及其构造演化.大地构造与成矿学,26(1):33-41.
    高阳,张寿庭.2007.云南个旧老厂锡矿矿田构造垂直分带研究.大地构造与成矿学,31(3):335-341.
    姜福芝,王玉往.2005.海相火山岩与金属矿床.北京:冶金工业出版社:1-241.
    赖绍聪,秦江锋,李学军,臧文娟.2010.昌宁-孟连缝合带乌木龙-铜厂街洋岛型火山岩地球化学特征及其大地构造意义.地学前缘,17(3):44-52.
    李永植.1996.论现代岛弧、海沟及弧后盆地系统的热液沉积成矿作用.海洋通报,15(2):77-87.
    牛耀龄.2010.板内洋岛玄武岩(OIB)成因的一些基本概念和存在的问题.科学通报,55(2):103-114.
    Readinghg.1983.沉积盆地与全球构造.国外地质科技,83(6):82-113.
    孙书勤,汪云亮,张成江.2003.玄武岩类岩石大地构造环境的Th、Nb、Zr判别.地质论评,49(1):40-47.
    王登红,陈毓川.2001.与海相火山作用有关的铁-铜-铅-锌矿床成矿系列类型及成因初探.矿床地质,20(2):112-128.
    王中刚等.1989.稀土元素地球化学.北京:科学出版社.
    吴孔友,刘磊.2010.大南盘江地区构造对油气藏破坏作用研究.大地构造与成矿学,34(2):255-260.
    许靖华.1993.残留弧后盆地及其辨识准则和实例.石油学报,14(1):1-13.
    张海,方维萱,张贵山,甘凤伟,魏宁,郭玉乾.2009.云南个旧卡房中三叠世安尼期变火山岩相序恢复及成矿分析.中国地质,36(6):1322-1330.
    张建东,彭省临,杨斌,刘明,王力.2007.云南个旧锡矿遥感信息提取及找矿预测.大地构造与成矿学,31(4):424-429.
    赵宇,张传林,郭坤一,董永观,王爱国,解亚平.2001.西昆仑山东段石炭纪火山岩岩石地球化学特征及其形成的构造背景.火山地质与矿产,22(3):186-192.
    赵振华,熊小林,王强,乔玉楼.2008.铌与钽的某些地球化学问题.地球化学,37(4):304-320.
    庄永秋,王任重,扬树培,尹金明.1996.云南个旧锡铜多金属矿床.北京:地震出版社:1-145.
    Condie K C.1989.Geochemical changes in basalts and andes-ites across the Archaean-Proterozoic boundary:Identifica-tion and signficance.Lithos,23:1-18.
    Green TH.1995.Significance of Nb/Ta as an indicator of geo-chemical processes in the crust-mantle system.ChemicalGeology,120:347-359.
    Irvine TN and Baragar W R A.1971.A guide to the chemicalclassification of the common rocks.Can J Earth Sci,8:523-548.
    Jia Runxing,Fang Weixuan and Hu Ruizhong.2010.Chemicalcompositions and significance of tourmaline from Gejiu tinpolymetal deposit,Yunnan,China.Acta Geologica Sinica,84(1):155-166.
    Le Maitre R W,Bateman P,Dudek A,Keller J,Le Bas M J,Sabine P A,Schmid R,Sorensen H,Strecjeisen A,Wool-ey A R and Zanettin B.1989.A classification of igneousrocks and glossary of terms.Oxford:Blackwell Scientific:130-173.
    Lebas MJ.2000.IUGS reclassification of the high-Mg and pic-ritic volcanic rocks.JPetrol,41(10):1467-1470.
    Pearce J A and Stern R J.2006.Origin of back-arc magmas:Trace element and isotope perspectives//Back-arc sprea-ding syetems:Geological,biological,chemical,and physi-cal interactions.Geophysical Monograph Series166.Pub-lished by the American Geophysical Union:63-68.
    Sun S S and McDonough W F.1989.Chemical and isotopic sys-tematics of oceanic basalts:Implications for mantle compo-sition and processes//Saunders A D and Norry M J(eds).Magamatism in the ocean basins.London:Geolog-ical Society Special Publication:313-345.
    Usui A,Yuasa M,Yokota S,Nohara M,Nishimura A and Mu-rakami F.1986.Submarine hydrothermal manganese de-posits from the Ogasawara(Bonin)Arc,off the JapanIslands.Marine Geology,73(3-4):311-322.
    Wi1son M.1989.Igneous petrogenesis.London:Unwin Hy-man:1-466.

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