阿尔泰信纽新铜金矿床氧化带形成过程中自然金的组分演化

该矽卡岩型铜金矿床位于阿尔泰萨拉寇克申花岗杂岩体与下寡武统火山沉积岩之接触带上，热液型金矿化（360-130℃）多叠加于早期矽卡岩（ > 400℃）之上。金矿化多分布于石榴万一硅灰石矽卡岩中。在氧化作用过程中导致次生成化物富集、自然金的成色降低，原因是金的活动性比银更强。与之同时，在氧化作用过程中自然金有部分银去除，故其成色与内生矿石中自然金相近。因此，在氧化带中自然金的成色具有广阔的离散性特点。为此，在评价深部矿石过程中应充分地加以考虑。

THE EVOLUTION OF NATIVE GOLD COMPOSITION DURING THE FORMATON OF OXIDIZED ZONE IN SINIUKHIN COPPER－GOLD DEPOSIT,ALTAI

The skarn type of copper－gold deposit occured in the contact zone of Salakoukeshengranitoid complex and Lower Cambrian Series volcanic sedimentary rock． Hydrothermal goldmineralization（360－130℃）mostly superimposed on skarn rock（400℃）．Gold mineralizationmostly distributed in garnet－wollastonite skarn rock．Oxidation resulted enrichment of sec-ondary sulphide and the reducing of native gold，the reason for the latter was that the gold ismore active than silver．At the same time，part of silver seperated out from native gold duringoxidation，so the fractional percentage points of gold is similar to native gold in endogeneticore;Because of the fractional percentage points of native gold in oxidized zone has widly disc-retation， we should pay more attention to it in evaluating deep seated ore.