火山热液型铅锌矿床岩石地球化学特征及预测指标

火山热液型铅锌矿床赋矿围岩、后期脉岩和蚀变岩石中成矿元素铅锌银含量高,矿体元素组合复杂,原生异常发育,并存在着原生分带现象。矿体前缘元素为I、Hg、As、Sb、B、Ba;近矿指示元素是Pb、Zn、Ag、Au、Cd、Mn、Cu;尾部或矿下指示元素为Cu、Mo、W、Sn。根据矿床指示元素的分布规律和原生晕的分带性,研制了判别矿床剥蚀程度和评价异常的地球化学指标,建立了该类矿床的地球化学找矿预测标志。

PETROGEOCHEMICAL CHARACTERISTICS AND PROGNOSTIC INDICES OF VOLCANOGENE HYDROTHERMAL ORE DEPOSITS

In ore-hosting wall rocks, late stage vein rocks and altered rocks of volcanogene hydrothermal ore deposits, the contents of ore-forming elements Pb, Zn and Ag are high, the element associations of ore bodies are complex, the primary anomalies are very developed, and there exists primary zoning. The frontal elements are I, Hg, As, Sb, B and Ba, the near-ore indicator elements are Pb, Zn, Ag, Au, Cd, Mn and Cu, and the rear or underneath indicator elements are Cu, Mo, W and Sn. According to the distribution of the indicator elements and the zoning of the primary anomalies in the ore deposit, the authors put forward geochemical indices for judging the denudation extent and evaluating anomalies of the ore deposit, and set up geochemical ore-prognostic criteria for this kind of ore deposits.