中国主要类型锑矿床氢、氧、碳同位素组成及地球化学特征

中国主要类型锑矿床中主要矿物的δ18O值从 +5.2‰～ +2 5.84‰ ,离差值为2 0 .64 ;实测与计算的δ18OH2 O值从 -8.0 3‰～ +1 5.9‰ ,离差值高达 2 3 .93 ;矿物包裹体分析的δDH2 O值变化范围从 -1 2 4 .3‰～ -3 8.0‰ ,离差值达 86.3 ;矿物样品的δ13C值变化范围为 -9.73‰～ +1 .79‰ ,离差值为 1 1 .52。经综合研究后认为锑矿床的成矿流体是多源的 ,既有岩浆水、变质水和大气降水 ,也有地层封存水、海水和吸附水加入成矿流体。因此 ,锑矿床的成因较复杂 ,应根据成矿物质来源、成矿作用等的差异 ,分别研究各类矿床的特征 ,才能较好地指导找矿勘查工作。

HYDROGEN, OXYGEN AND CARBON ISOTOPIC COMPOSITIONS AND GEOCHEMISTRY OF THE MAIN TYPE OF ANTIMONY DEPOSITS IN CHINA

The δ\{\}\+\{18\}O values of major minerals in the main type of antimony deposits in China range from \{+5.2‰\} to \{+25.84‰\} with a difference of 20.64‰. The measured and calculated δ\{\}\+\{18\}O\-\{H\-2O\} values are from \{-8.03‰\} to \{+15.9‰\} with a difference of 23.93‰. The δD\-\{H\-2O\} values obtained from the analyses of the inclusions of minerals range from -124.3‰ to \{-38.0‰\} with a difference up to \{86.3‰\}. The \{δ\{\}\+\{13\}C\} values of mineral samples are from -9.73‰ to +1.79‰ with a difference of 11.52‰. A comprehensive study suggests that the ore\|forming fluids of antimony deposits were of multiple source, i.e., a wide variety of waters were involved in the ore\|forming fluids, including magmatic water, metamorphic water and meteoric water, as well as strata\|confined water, sea water and absorption water. So antimony deposits are complex in genesis and studies are necessary for the features of different types of antimony deposits according to their differences in the origin of ore\|forming materials and metallogenic process so as to effectively guide their exploration and prospecting.