黑龙江伊春大安河金矿成矿流体性质与成矿物质来源

对大安河金矿床的地质特征、流体包裹体和硫、铅同位素研究，进一步厘定该矿床成矿经历了石榴石--透辉石、透闪石--阳起石、磁铁矿、石英--硫化物和石英--方解石等5 个阶段，为典型的矽卡岩型矿床。选取典型的三阶段流体包裹体，测得各阶段的成矿温度和盐度分别为: 石榴石--透辉石阶段均一温度177℃～ 600℃，盐度7%～ 12. 2%; 石英硫化物阶段均一温度147℃～ 455℃，盐度1%～ 5%; 石英--方解石阶段均一温度130℃～ 247℃，盐度0. 5%～ 3%。流体包裹体气相成分主要为CO2、H2O 以及少量CH4。矿石中硫化物的δ34SV － CDT 为－ 2. 9 × 10 － 3～ － 0. 6 × 10 － 3，其组成接近零值，表明成矿物质可能来源于地幔。矿石中硫化物206 Pb /204 Pb = 18. 099 ～ 18. 508，207Pb /204 Pb = 15. 532 ～ 15. 578，208 Pb /204Pb = 38. 071 ～ 38. 176，反映出成矿物质来源的多元性，为壳幔混合来源。

Nature of metallogenetic fluids and material sources in Da'anhe gold deposit, Yichun of Heilongjiang Province

The research of geological features of ore deposit ，fluid inclusion，sulfur and lead isotope has been recognized the ore-forming process consisting of five stages，including garnet-diopside，tremolite-actinolite， magnetite，quartz-sulfide and quartz-calcite stages，which indicates the deposit as a typical skarn in type． The testing results of homogenization temperatures and salinity of typical fluid inclusions from the selected three different mineralization stages show the homogenization temperatures value as 177℃～ 600℃ and salinity value as 7% ～ 12. 2% in garnet-diopside stage; homogenization temperatures value of 147℃～ 455℃ and salinity value of 1%～ 5% in quartz-sulfide stage; and homogenization temperatures value of 130℃～ 247℃ and salinity value of 0. 5%～ 3% in quartz-calcite stage． The gas composition of fluid inclusions were of CO2 ，H2O and a small amount of CH4 ． The δ34SV － CDT of ore sulfide value was － 2. 9 × 10 － 3～ － 0. 6 × 10 － 3，and the composition was close to zero， which the ore-forming meterals may come from mantle． The 206Pb /204 Pb was 18. 099 ～ 18. 508，207 Pb /204 Pb as 15. 532 ～ 15. 578 and 208Pb /204Pb as 38. 071 ～ 38. 176 in the ore sulfide，which refelceted the diversity metallogenetic material meterals，derived from a mantle-crust mix．