为了查明奈林沟金矿床的成矿物质来源及矿床成因，分别对氢、氧同位素和碳、氧同位素进行了测试分析。石英流体包裹体氢、氧同位素研究表明：δ18 O变化范围在-3．6‰～0．2‰，平均值为-1．71‰，石英的δD介于-115‰～-98‰，平均值为-105．9‰，说明成矿流体与岩浆作用关系密切，原始岩浆水是早期成矿流体主要来源，后期则有大量的大气降水混入，是岩浆水与大气降水共同组成的混合水。方解石的碳、氧同位素研究表明：δ13 C平均值为-4．54‰，与地幔δ13 C值-5．5‰相近；δ18 O平均值为7．86‰，与花岗岩δ18 O的变化范围7‰～13‰相符，说明成矿流体与花岗岩质岩浆热液有关。综合分析认为，奈林沟金矿床属于浅成中低温重熔岩浆热液型金矿床。
In order to find out the source of ore-forming materials and the genesis of Nailingou gold deposit ,the paper respectively investigated and analyzed C-H-O isotopes.The hydrogen and oxygen isotope studies of fluid inclu-sions in quartz shows that δ18 O ranges between -3.6‰ -0.2 ‰,and average is -1.71‰,δD of the quartz chan-ges from -115‰to -98‰with the mean -105.9‰,showing that the ore-forming fluids are closely related to the magmatism.The early sources of ore-forming fluids were primary magmatic water ,and later mixed with a large amount of atmospheric precipitation ,a mixture of magmatic water and meteoric water .The carbon and oxygen isotope analysis of Calcite in Nailingou gold deposit shows that δ13 C average is -4.54 ‰,approaching to the δ13 C -5.5 ‰of man-tle,and δ18 O ( SMOW) is 7.86 ‰,coinciding with the δ18 O range 7 ‰-13 ‰ of the Granite,while different from that of Andesite ,which indicate that the ore-forming fluids were derived from granite body .
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