乌努格吐山斑岩型铜(钼)矿床地球化学勘查指标

摘要

对乌努格吐山斑岩型铜钼矿床进行地球化学勘查指标研究,通过探讨47种元素在矿床中的富集、贫化等分布特征,结合蚀变、矿化分带等因素,筛选了斑岩型铜(钼)矿床的地球化学勘查指标.[KK(SiO2)+ KK(K2O)]/[KK(Al2O3) +KK(Na2O)+KK(CaO) +KK(Fe2O3) +KK(MgO)]、KK( K2O)/KK (Na2O)、KK(K2O)/KK(Rb)、CaO、MgO、Na2O等指标可以反映矿床的成矿环境,圈定矿床的蚀变范围及蚀变程度等；近矿指标Cu、Mo、Ge、W、Sn、F、Bi、S、Se、Hf等可以反映矿床的矿化程度、矿体产出位置等；远矿指标[KK(Pb)·KK(Zn)×1000]/[KK(Cu)·KK(Mo)]、[KK(As)· KK(Sb)· KK(Bi)]/[KK(Cu)· KK(Mo)]、[KK(Au)· KK(Ag)]/[KK(Cu) · KK(Mo)]、As、Au、Ag、Te等可以突出找矿范围和找矿目标.这些指标既为本地区寻找同类型矿床提供了技术支持,也拓宽了其他类型矿床的找矿思路.同时,应用对数累计频率散点图确定指标的异常上(下)限,为实现指标定量化提供了有效范例.%The Wunugetushan porphyry Cu ( Mo) deposit is a typical porphyry Cu ( Mo) deposit in the Ergun metallogenic belt. Based on the depletion and enrichment regularity of 47 elements and the alteration zone or mineralization characteristics, this paper has summarized geochemical indicators of this ore deposit. The metallogenic environment indicators such as [ KK ( SiO2) + KK ( K2O) ]/[ KK (A12O3) +/fK(Na20) + XK(Ca0)+KK(Fe2O3)+?TK(MgO)],KK(K2O)/KK(Na2O),KK(K2O)/KK(Rb), CaO, MgO and Na2O can reflect the ore-forming environment and the alteration extent and delineate the alteration area. Cu, Mo, Ge, W, Sn, F, Bi, S, Se and Hf serve as the near - ore indicators, which can reflect the mineralization degree and even indicate the location of the ore body in this ore deposit; [KK(Pb) · KK(Zn) × 1000]/[KK(Cu) · KK( Mo) ], [KJ As) · KK(Sb) · KK(Bi) ]/[KK(Cu) · KK(Mo) ], [KK (Au) ? KK(Ag)]/[KK(Cu) · KK(Mo) ] ,As, Au, Ag and Te serve as the ore periphery indicators, which can enlarge the target of geochemical exploration. These geochemical exploration indicators could offer technical assistance to the prospecting for similar ore deposits in this area and broaden the geological exploration thinking for other types of ore deposits. The anomaly upper/lower limits of these geochemical exploration indicators can be determined by log cumulative frequency scatter diagram.