新疆哈尔里克地区主要地层单元含矿性分析

Analysis of ore-bearing properties of major stratigraphic units in Harlik area of Xinjiang Province

哈尔里克成矿带属铜、金、钨、锡、钼、铁、锰、镍、钴多金属成矿有利地段。为进一步研究成矿带内各地层的含矿性,以天山哈密地区1∶5万水系沉积物测量为基础,分析了17种元素及氧化物的特征参数、分布规律及演化特征,对7个地层单元的含矿性进行了分析。结果显示哈尔里克地区Au、Sb、Bi呈极不均匀分布(变异系数Cv≥1.5),As、Hg、W为不均匀分布(1.0≤Cv<1.5);区内元素有对称、正偏、负偏和双峰4种分布类型。各地层单元元素及氧化物浓集系数均表现为波浪形曲折变化。铁族元素主要富集于大柳沟组和头苏泉组;钨、钼族元素主要富集于头苏泉组;Au主要富集在大柳沟组、大南湖组;综合分析认为Au、Cu、W、Bi、Fe、Mn、Zn为研究区优势矿种,主成矿元素为Au、Cu、Fe,最佳富集地质时代为奥陶纪,泥盆纪次之,奥陶系大柳沟组为主要含矿地层。

The Harlik metallogenic belt is a favorable area for polymetallic mineralization of Cu,Au,W,Sn,Mo,Fe,Mn,Ni and Co.In order to further study the ore-bearing properties of each stratum in the metallogenic belt,based on the 1∶50000 stream sediment measurements in Hami area of Tianshan Mountains,the authors analyzed the characteristic parameters,distribution and evolution of 17 elements,and the ore-bearing properties of 7 stratigraphic units.The results show that Au,Sb and Bi are of extremely uneven distribution(Cv≥1.5),and As,Hg and W are of uneven distribution(1.5>Cv≥1.0).There are four distribution types of elements in the region:symmetry,positive bias,negative bias and bimodal.The concentration coefficients of these elements and oxides show a wavy and tortuous change in each stratigraphic unit.Iron group elements are mainly enriched in Daliugou Formation and Tousuquan Formation.Tungsten and molybdenum group elements are mainly enriched in Tousuquan Formation.Au is mainly enriched in Daliugou Formation and Dananhu Formation.Au,Cu,W,Bi,Fe,Mn and Zn are the dominant mineral resources in the study area after comprehensive analysis.And the main mineralizing elements are Au,Cu and Fe,and their optimum enrichment age is Ordovician,followed by Devonian.The Daliugou Formation of Ordovician is the main ore-bearing stratum.