新疆哈图金矿成矿地球化学特征

Metallogenic Geochemical Characteristics of the Hatu Gold Deposit in Xingjiang

文章分析了哈图金矿成矿元素与共(伴)生元素的种类和含量以及矿脉中的石英流体包裹体特征,结果显示:含矿石英脉中发育含CO_2的三相(V_(CO_2)+L_(CO_2)+L_(H_2O))包裹体以及富液相和富气相的气液两相包裹体,均一温度为198?C～329?C,盐度0.7%～3.51%NaClwt%,成矿热液属于中低温、低盐度流体,其温度、压力随流体向上运移而明显降低.矿石中石英氧同位素δ^(18)OV-SMOW值为20.3‰～21.0‰,对应矿液中水的δ^(18)O值为8.6‰～14.8‰,具有变质水和岩浆水的混合特征.根据矿床地质特征、成矿条件及CCA多元统计结果,认为成矿元素和共(伴)生元素按地球化学活性依次析出,形成了由下而上的尾晕元素组合→近矿元素组合→前缘晕元素组合的分带序列.

This paper analyzes the types and contents of ore-forming elements and symbiotic elements(associated elements) and the characteristics of quartz fluid inclusions in the Hatu gold mine. The results display, CO2-containing three-phase inclusions(VCO2+ LCO2+LH2O) and two-phase inclusions(L+V). The homogenization temperature of inclusions is 198℃~329℃, and salinity is 0.7% to 3.51% NaClwt%, belong to the medium-low temperature, low salinity fluid. The temperature and pressure of the hydrothermal fluid are obviously reduced with the upward migration of the fluid. The oxygen isotopes δ18OV-SMOWin the ore are 20.3~21.0 and the δ18O values of the water in the ore are 8.6~14.8 Belong to the overlapping areas of metamorphic water and magmatic water. According to the geological characteristics of mineral deposits,metallogenic conditions and canonical correlation analysis of multi variatestatistical results, it is believed that the ore-forming elements and symbioticelements(associated elements) are precipitated in accordance with the geochemical activity. Forming a sub-band sequence consisting of a bottom-up halo element combination→Combination of near-mineral elements →a leading edge-halo elem-ent combination.