陕西金堆城钼矿地质—地球化学找矿模式
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摘要
金堆城钼矿矿区位于华北准地台西南缘与北秦岭加里东褶皱带两大构造单元交界位置。北秦岭加里东褶皱带实际为秦岭古海洋板块自南向北向华北陆块下俯冲的接触带,华北陆块边缘一侧。成矿母岩是燕山中晚期钾长花岗斑岩,面积0.06 km~2,其SiO_2>70%,K_2O>6%,K_2O/Na_2O远大于2,为酸性铝过饱和富碱高钾类型。围岩主要为长城系熊耳群安山玢岩,其内节理、裂隙发育。矿区断裂极为发育,以北东向断裂为主,此外有北西向断裂和节理、裂隙。围岩蚀变强烈。矿体以花岗斑岩为核心,向围岩呈锯齿状尖灭,矿化形态以细脉状为主。岩体及围岩以Mo、Zn、Cu组分高为特征,其中Mo-Zn为正相关,Mo-Cu为负相关。地球化学异常以Mo、Cu、Zn组合为主,其中Mo异常规模大、强度高,浓度分带清晰,内带面积大(涵盖了整个矿体,且内强外弱),Cu次之(浓集区围绕岩体分布于外接触带),Zn较弱。
Jinduicheng Molybdenum Deposit is located at the junction of two tectonic units,which are the southwest margin of quasiplatform in north China and Caledonian fold belt in northern Qinling. Caledonian fold belt is actually the contact zone of Qinling paleooceanic plate subducting to the North China plate from south to north. Ore-forming mother rock of the Jinduicheng Molybdenum Deposit is K-feldspar granite porphyry of middle-late Yanshan,with an area of 0.06 km~2. The SiO_2 content is more than 70 percent and K_2O is more than 6 percent,for aluminum over saturated and high alkali potassium rich medium acid rock. The wall rocks are mainly andesite of Xionger Group of Changcheng System and andesitic porphyrite,with joints and faults. Joints and folds are both well developed in ore district,which are mainly NE trending faults,and besides are NW trending faults and joints,and the rock erosion is strong. The ore-body takes the granite porphyry as the core,which is serrated and pointed to the surrounding rock and dominated by fine vein. Rock and surrounding rock are characterized by high content of Mo,Zn and Cu,in which Mo-Zn is positively correlated and Mo-Cu is negatively correlated. The geochemical anomalies are dominated by the group of Mo,Zn and Cu,in which Mo is large in scale,high in intensity with high concentration band,especially the inner band covers the whole ore body,and the intensity is higher in the center. The concentrated area of Cu is distributed in the outer contact zone,and Zn is the weakest of the three elements.
Jinduicheng Molybdenum Deposit is located at the junction of two tectonic units,which are the southwest margin of quasiplatform in north China and Caledonian fold belt in northern Qinling. Caledonian fold belt is actually the contact zone of Qinling paleooceanic plate subducting to the North China plate from south to north. Ore-forming mother rock of the Jinduicheng Molybdenum Deposit is K-feldspar granite porphyry of middle-late Yanshan,with an area of 0.06 km~2. The SiO_2 content is more than 70 percent and K_2O is more than 6 percent,for aluminum over saturated and high alkali potassium rich medium acid rock. The wall rocks are mainly andesite of Xionger Group of Changcheng System and andesitic porphyrite,with joints and faults. Joints and folds are both well developed in ore district,which are mainly NE trending faults,and besides are NW trending faults and joints,and the rock erosion is strong. The ore-body takes the granite porphyry as the core,which is serrated and pointed to the surrounding rock and dominated by fine vein. Rock and surrounding rock are characterized by high content of Mo,Zn and Cu,in which Mo-Zn is positively correlated and Mo-Cu is negatively correlated. The geochemical anomalies are dominated by the group of Mo,Zn and Cu,in which Mo is large in scale,high in intensity with high concentration band,especially the inner band covers the whole ore body,and the intensity is higher in the center. The concentrated area of Cu is distributed in the outer contact zone,and Zn is the weakest of the three elements.
引文
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赫英,王新.2002金堆城钼矿床两类斑岩体的初步比较研究[J].矿床地质,(s1):416-417.
黄建军,等.1982金堆城-黄龙铺钼矿田控矿因素及矿床成因探讨[J].西北冶金地质,(2).
黄建军,等.1983.陕西小秦岭地区钼矿成矿规律找矿方向的研究报告[R].西安:西北有色金属地质研究所.
简伟,柳维,石黎红.2010.斑岩型钼矿床研究进展[J].矿床地质,29(02):308-316.
李遐昌.1983.金堆城-黄龙铺钼矿田地球化学特征及成矿条件的初步分析[J].地质与勘探,(6):61-66.
刘小舟,王轩,张江,等.2008.陕西金堆城斑岩型钼矿床地质地球化学特征[J].西北地质,41(3):71-78.
陕西省地质局金堆城地质队,1959.陕西省华县金堆城钼矿床最终地质勘探报告[R].
中国有色金属工业总公司北京矿产地质研究所.1987.有色及贵金属矿田(床)地球化学异常模式[R].
徐兆文,杨荣勇,陆现彩,等.1998.金堆城斑岩钼矿床地质地球化学特征及成因[J].地质找矿论丛,13(4):18-27.