新疆北山地区东盐池一带地层、岩体含矿性地球化学评价

为评价北山成矿带东盐池地区地层及岩体的成矿潜力,以地层和岩体中的岩石化学元素光谱分析数据为基础,开展了比较系统的地球化学分析,从成矿元素富集系数(K)、后期叠加强度(D)和成矿元素变异系数(CV)等方面分析其含矿性。成矿元素富集系数(K)分析表明:该区域Pb、Au、Ag、Co、W、Bi、P、V等元素存在明显的富集,成矿潜力巨大;成矿元素后期叠加强度(D)分析表明:该区Pb、W、Au存在较为强烈的叠加;成矿元素变异系数(CV)分析表明:东盐池一带各时代地层及侵入岩中Pb、W、Au、Co、Bi、Zn等存在较强的变异程度。对该区地层和岩体成矿能力综合评价认为,东盐池地区最优势矿种为Pb、Au、W、Ag、P、V,长城系古硐井岩群是Pb的主要赋矿层位;寒武系双鹰山组和西双鹰山组是P、V的主要赋矿层位;寒武系、中元古代地层以及中寒武世和晚石炭世侵入岩是W、Au、Ag等元素的主要含矿地质单元。

Geochemical evaluation of Ore-bearing Strata and Rock Mass in the East Yanchi, Beishan area, Xinjiang

In order to evaluate the ore-forming potential of strata and rock mass in the East Yanchi area of the Beishan metallogenic belt, a comparative systematic geochemical analysis is carried out on the basis of spectral analysis data of petrochemical elements in strata and rock mass. The ore-forming element enrichment factor (K), the late superposition intensity (D), and the ore-forming elemental coefficient of variation (CV) were analyzed for its minerality. The results are as follows: the analysis of K indicates that Pb, Au, Ag, Co, W, Bi, P, V and other elements are significantly enriched in this region, and the metallogenic potential is huge; D analysis shows that there is a strong superposition of Pb, W, and Au in this area; the analysis of CV indicates that Pb, W, Au, Co, Bi, Zn, etc. in strata and intrusive rocks in the East Yanchi area have strong variability. According to the comprehensive evaluation of the ore-forming ability of strata and rock mass in this area, the most dominant minerals in the East Yanchi area are Pb, Au, W, Ag, P, and V. The Gudongjing group in the Great Wall is the main ore-bearing stratum of Pb; the Shuangyingshan formation and the Xishuangyingshan formation of Cambrian are the main ore-bearing horizons of P and V; the Cambrian, Mesoproterozoic strata, and the Middle Cambrian and Late Carboniferous intrusive rocks are the main elements of W, Au, Ag, etc.