中冈底斯布东拉金矿床地质特征、控矿因素和找矿标志
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摘要
布东拉金矿床是近年来在中冈底斯岩浆岩带新发现的少有的中型岩金矿床。矿床位于措勤弧后盆地的北西向和北东向断裂的交汇部位,矿体严格受断裂构造的控制,产于北西向次级断裂带中,呈脉状、透镜体状产出;矿体由石英脉和构造蚀变岩组成,主要矿石矿物为黄铁矿、黄铜矿、方铅矿、闪锌矿,以及自然金等;矿床围岩蚀变强烈,以黄铁绢英岩化为主;岩浆岩和构造是该矿床的主要控制因素;北西向构造、围岩蚀变、含硫化物石英脉、地球化学异常等可作为找矿标志。该矿床的发现丰富了冈底斯金矿床的矿床类型,对金成矿规律的总结具有重要意义。
Be founded at the magmatic belt of middle Gangdese, the medium Boudongla goldern deposit is located at the jointing part between northwestern rupture and northeastern rupture of back-arc basin. The vein and lens orebody are developed in NW sublevel fractured zone, and be controlled by fractured structure. They are composed of quartzite veins and altered rock with the principal minerals of pyrite, chalcopyrite, galena, sphalerite and native gold. The wallrock alter strongly by pyritized phyllite.We will prospect in the area according to the magmatic rock and structure as well as the NW structure, wallrock alteration, sulfid-bearing quartz vein and geochemical anomaly. It is better to find Boudon's deposit for conclude the gold formation regulation.
Be founded at the magmatic belt of middle Gangdese, the medium Boudongla goldern deposit is located at the jointing part between northwestern rupture and northeastern rupture of back-arc basin. The vein and lens orebody are developed in NW sublevel fractured zone, and be controlled by fractured structure. They are composed of quartzite veins and altered rock with the principal minerals of pyrite, chalcopyrite, galena, sphalerite and native gold. The wallrock alter strongly by pyritized phyllite.We will prospect in the area according to the magmatic rock and structure as well as the NW structure, wallrock alteration, sulfid-bearing quartz vein and geochemical anomaly. It is better to find Boudon's deposit for conclude the gold formation regulation.
引文
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12潘桂棠,莫宣学,侯增谦,等.冈底斯造山带的时空结构及演化[J].岩石学报,2007,22(3):521~533.
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2冯孝良.西藏金矿资源分布规律-矿化类型及找矿方向[J].特提斯地质,1999,23(1):35~42.
3李光明,曾庆贵,雍永源,等.西藏冈底斯成矿带浅成低温热液型金锑矿床的发现及其意义-以西藏弄如日金锑矿床为例[J].矿床地质,2005,24(06):595~602.
4聂凤军,胡朋,江思宏,等.藏南地区金和锑矿床(点)类型及其时空分布特征[J].地质学报,2005,79(3):373~385.
5 ZHU X,LI G,CHEN H,et al.Zircon U-Pb,Molybdenite Re-Os and K-feldspar 40 Ar/39 Ar Dating of the Bolong Porphyry Cu-Au Deposit,Tibet,China[J].Resource Geology,2015,65(2):122~135.
6黄瀚霄,李光明,刘波,等.藏北商旭造山型金矿床的发现及意义[J].矿床地质,2014,33(3):486~496.
7肖万峰,李光明,黄瀚霄,等.藏北商旭金矿床控矿因素及其找矿标志[J].黄金,2013,34(10):17~21.
8刘洪,黄瀚霄,李光明,等.因子分析在藏北商旭金矿床地球化学勘查中的应用[J].中国地质,2015,42(4):1126~1136.
9黄瀚霄,李光明,刘波,等.西藏仲巴县天宫尼勒矽卡岩型铜金矿床锆石U-Pb年代学和岩石地球化学特征:对成因及其成矿构造背景的指示[J].地球学报,2012,33(4):424~434.
10朱弟成,赵志丹,牛耀龄,等.拉萨地体的起源和古生代构造演化[J].高校地质学报,2012,18(1):1~15.
11张立雪,王青,朱弟成,等.拉萨地体锆石Hf同位素填图:对地壳性质和成矿潜力的约束[J].岩石学报,2013,29(11):3681~3688.
12潘桂棠,莫宣学,侯增谦,等.冈底斯造山带的时空结构及演化[J].岩石学报,2007,22(3):521~533.
13朱弟成,潘桂棠,王立全,等.西藏冈底斯带中生代岩浆岩的时空分布和相关问题的讨论[J].地质通报,2008,27(9):1535~1550.
14 GENG Q R,PENG Z M,ZHANG Z.Metallogenesis related to magmatic arcs in North and South sides of the Bangong-Nujiang suture in central Tibet[J].ACTA Geologica Sinica,2013,87(Z1):22~24.
15 WANG Q,ZHU D C,ZHAO Z D,et al.Origin of the ca.90 Ma magnesia-rich volcanic rocks in SW Nyima,central Tibet:Products of lithospheric delamination beneath the Lhasa-Qiangtang collision zone[J].Lithos,2014,198-199:24~27.
16王伟,曾令森,刘静,等.西藏措勤晚白垩世英安岩的厘定与地球化学特征[J].地质科学,2013,48(2):484~500.