甘肃省肃南县纳木沟铜矿床地球化学特征及其成因分析
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摘要
肃南县纳木沟铜矿为一典型的铜多金属矿床,研究程度相对较低,目前尚未见到地球化学研究报道。笔者结合矿床地质探讨火山岩主微量元素、稀土元素特征及其成因分析。成矿火山岩Si O2(45.75%～53.94%)、Ti O2(0.26%～0.38%)质量分数中等,ALK(K2O+Na2O)=0.25～4.66,碱含量较低,K2O/Na2O=0.03～0.50,具富钠贫钾,低铝、低镁特点。稀土总量较低,属重稀土富集型,分配曲线较平直,略呈左倾的特点,具有Eu轻微负异常、Ce轻微负异常特征。硫化物组成主要为黄铁矿、黄铜矿、闪锌矿,成矿金属为铜锌组合,贫铅。铜锌矿体为同体共生矿体,伴生贵金属金、银,金具有较好成矿潜力,局部地段可单独圈定金矿体。赋矿地层为奥陶纪海相基性火山岩,矿体主要赋存于片理化钙碱性玄武安山岩中。
The Namugou copper deposit in Sunan county is a typical copper polymetallic deposit with relatively low degree of study and no geochemical study has been reported. Based on the geology of the deposit,the author discusses the characteristics and genesis of the main trace elements and rare earth elements in volcanic rocks. Metallogenic volcanic rocks Si O2( 45.75%～53.94%) 、Ti O2( 0.26%～0.38%) the mass fraction is medium,ALK( K2 O+Na2 O) = 0.25 ～ 4.66,low alkali content,K2 O/Na2 O = 0.03 ～ 0.50,with the characteristics of rich sodium and pot assium poor,low aluminum and low magnesium.The total amount of rare earth is low,which belongs to heavy rare earth enrichment type. The distribution curve is straight and slightly left-leaning. It has the characteristics of slight negative Eu anomaly and slight negative Ce anomaly. Sulfide is mainly composed of pyrite,chalcopyrite and sphalerite. The metallogenic metal is composed of copper zinc and poor lead. Copper-zinc ore body is a symbiotic ore body,accompanied by precious metals such as gold and silver. Gold has a good metallogenic potential,and gold ore body can be separately delineated in some sections. The ore bearing strata are Ordovician Marine basic volcanic rocks,which are mainly hosted in foliate calcic alkaline basaltic andesite.
The Namugou copper deposit in Sunan county is a typical copper polymetallic deposit with relatively low degree of study and no geochemical study has been reported. Based on the geology of the deposit,the author discusses the characteristics and genesis of the main trace elements and rare earth elements in volcanic rocks. Metallogenic volcanic rocks Si O2( 45.75%～53.94%) 、Ti O2( 0.26%～0.38%) the mass fraction is medium,ALK( K2 O+Na2 O) = 0.25 ～ 4.66,low alkali content,K2 O/Na2 O = 0.03 ～ 0.50,with the characteristics of rich sodium and pot assium poor,low aluminum and low magnesium.The total amount of rare earth is low,which belongs to heavy rare earth enrichment type. The distribution curve is straight and slightly left-leaning. It has the characteristics of slight negative Eu anomaly and slight negative Ce anomaly. Sulfide is mainly composed of pyrite,chalcopyrite and sphalerite. The metallogenic metal is composed of copper zinc and poor lead. Copper-zinc ore body is a symbiotic ore body,accompanied by precious metals such as gold and silver. Gold has a good metallogenic potential,and gold ore body can be separately delineated in some sections. The ore bearing strata are Ordovician Marine basic volcanic rocks,which are mainly hosted in foliate calcic alkaline basaltic andesite.
引文
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[2]郭周平,李文渊,贾群子,等.北祁连塞浦路斯型铜矿床地质地球化学特征及对比研究[J].地质与勘探,2010(01):76-84.
[3]李文渊,杨合群,赵东宏,等.北祁连发现塞浦路斯型富铜工业矿床[J].矿床地质,1999,18(03).
[4]齐瑞荣,陈世强,胡小春,等.甘肃北祁连西段镜铁山铁矿外围勘查实践-以卡瓦铁矿富集区找矿突破为例[J].甘肃地质,2015(01):15-22.
[5]任文秀,董国强,赵淇馨,等.甘肃省阿克塞县当金山花岗岩地球化学特征及构造意义[J].甘肃地质,2013(04):26-31.
[6]王建军.北祁连西段祁青构造混杂岩中的单颗粒锆石U-Pb年龄及其地质意义[J].甘肃地质,2014(03):13-18.
[7]武文平,王伟.综合物探方法在红柳沟铜矿的应用[J].甘肃地质,2010(01):78-82.
[8]夏林圻,夏祖春,徐学义.北祁连山海相火山岩岩石成因[M].北京:地质出版社,1996.
[9]夏林圻,夏祖春,任有祥,等,祁连山及邻区火山作用与成矿[M].北京:地质出版社,1998.
[10]夏林圻,夏祖春,任有祥,等,北祁连山构造-火山岩浆-成矿动力学[M].北京:中国大地出版社,2001.
[11]于浦生,邬介人.北祁连山火山岩带金矿[M].北京:地质出版社,2000.
[12]杨合群,李文渊,赵东宏,等.北祁连山石居里沟富铜矿床成矿特征[J].地质与勘探,2000,36(06):20-22.
[13]杨合群,宋忠宝,王兴安,等.北祁连山中西段塞浦路斯型铜矿特征、成矿作用及找矿标志[J].西北地质,2002,35(04):65-85.
[14]杨兴吉.甘肃省祁连山中西段铜矿资源潜力分析及远景评价[J].甘肃冶金,2005(03).
[15]周志强,曹宣铎.祁连山东部早古生代地层和沉积-构造演化[J].西北地质(原西北地质科学),1996,17(01):1-58.
[16]赵朝伟,张志平,徐永利,等.甘肃肃南大岔牧场-康隆寺一带水系沉积物测量地球化学特征及成矿远景区划分[J].甘肃科技,2017(10):26-32.