文章对浩尧尔忽洞金矿床控矿构造进行了分析,指出区域内主要存在三期构造-岩浆作用控制着金矿体的空间展布.第一期构造变形发生在加里东期,地层受强烈的挤压作用,形成一系列紧闭线性褶皱和深大断裂;第二期构造作用发生在海西早期,大规模岩浆侵入使地层强烈变形呈“残留体”分布在花岗岩基中,形成了大量中酸性脉岩和含金属硫化物石英细脉;第三期强烈脆-韧性剪切作用形成了一系列挤压破碎带和透镜体,为稍晚期含金硫化物细脉侵位提供了良好空间.

Hercynian granite is found developed in Haoyao′erhudong gold deposit,a low-intermediatehydrothermal deposit with low-grade ultra-large reserves.Analysis on the granite has shown that the ratio of SiO2ranges from 71.5%to 73.07%,and the ratio of Na2O/K2O ranges from 0.59to 0.67with an average value of 0.64,thus the granite belongs to high-K calcalkaline series.According to Hark diagram,the content of each element is obviously in line with the variation tendency of SiO2,to express the characteristics of I-type granite.The content of Mg#ranges from 39to 49,and its average of 43is similar to the average value(45.36)of lower crust granulite.The value of∑REE from 72.64×10-6 to 132.6×10-6 signifies a low content of rare earth.The ratio of(La/Yb)N ranges from 12.99to 34.13,revealing biggish fractionation between LREE and HREE.The distribution curve on REE spider chart goes right.The ratio of Ba/Th ranges from 133.93to 178.93,indicating less influence on the underthrust plate.The content ofδEu varies from 0.52to 0.96,with an average of 0.75,indicating negative Eu anomaly from interm ediate to a low er level.A ccording to som e other geochem ical features,it is considered that the ore body is high-K Calc-alkaline I-type granite formed in post-collision environment.

南太行山平顺闪长岩锆石SHRIMP测年表明闪长岩体形成于(125.5±2.3)Ma,与太行山其他地区乃至整个华北地区侵入杂岩体具有相近的形成年代,表明在晚中生代(115～135 Ma)太行山地区与华北地区经历了相同的构造岩浆事件.平顺闪长岩w(SiO2)=48.57％～63.54％,w(Al2O3)=13.53％～19.15％,w(MgO)-1.20％～9.31％,w(TiO2) =0.34％～1.07％,w(CaO) =3.13％～10.39％,w(K2O+Na2O) =4.78％～7.99％,Mg# =0.37～0.72,LREE富集HREE亏损,略显微弱的正Eu异常,以富集LILE、LREE元素和亏损Nb-Ta等高场强元素为特征.闪长岩(206Pb/204Pb)i=17.775～18.857,(207Pb/204Pb)i=15.522～15.602,(208Pb/204Pb)i =38.044～38.502,εNd(125 Ma)=-17.009 56～-9.606 32,ISr=0.705 85～0.707 53,表明起源于EMI富集地幔,并受到地壳物质和EMII型富集地幔混染,可能说明在晚白垩世太行山地区与整个华北克拉通都发生了岩石圈减薄事件.

内蒙古浩尧尔忽洞金矿为低品位超大型中低温热液型金矿,矿区内海西期花岗岩发育.在矿区内可见黑云花岗岩、花岗细晶岩、花岗伟晶岩和花岗斑岩.花岗岩中SiO2含量65.36％ ～74.29％,Na2O/K2O比值0.43 ～1.01,平均值为0.75,花岗脉岩类属于高钾钙碱性,黑云花岗岩属于钾玄岩系列.哈克图解上各元素含量随SiO2变化呈线性规律明显,具Ⅰ型花岗岩特征.∑REE值在64.86×10-6～164.80×10-6范围内变化,总体上稀土含量较低.(La/Yb)N值为6.59 ～ 16.98,显示轻重稀土有明显的分馏.稀土元素蛛网图表现为右倾.黑云母花岗岩δEu平均值0.30,具低Sr低Y的特点.花岗脉岩类δEu平均值为0.65,表现出高Sr低Y的特点.花岗岩类具有中等到强的铕亏损.根据其地球化学特征,认为该岩体为同碰撞—后碰撞期形成的高钾钙碱性Ⅰ型花岗岩.

The Pingshun skam iron deposits, located in southern Taihang mountains of Shanxi province, mainly occur along the contact zone between intermediate rocks and Middle Ordovician carbonate rocks. Sulfur isotope analyses show that delta S-34 values of iron ores vary in the range of 12.5 parts per thousand similar to 17.4 parts per thousand (averaged 15.0 parts per thousand), which is the character of crust sulfur. Pb isotope analyses reveal that Pb-206/Pb-204, Pb-207/Pb-204 and Pb-208/Pb-204 ratios of ore lead are 17.365 similar to 19.032 (average 18.121), 15.417 similar to 15.689 (averaged 15.543), 37.433 similar to 39.762 (averaged 38.379) respectively, and mu varies from 9.21 to 9.28, omega varies from 34.6 to 39.33, which displays the character of enrichment in uranium lead and loss in thorium lead. Composition character of sulfur and lead isotope in Pingshun iron ores implies that earlier diorites are main metallogenic mother rock, while later gabbros may provide some ore-forming materials and heat source indirectly during the metasomatism.