吉林红旗岭铜镍硫化物矿床主要由1号、2号及7号含矿岩体组成,主要矿石类型为浸染状矿石。其Re-Os等时线年龄研究显示:2号岩体Re-Os等时线年龄((215.0±24.0)Ma)与岩体的锆石SHRIMP U-Pb年龄((212.2±2.6)Ma)一致;而1号岩体Re-Os等时线年龄((237.0±16.0)Ma)则明显老于岩体的锆石SHRIMP U-Pb年龄((216.0±5.0)Ma)。这表明浸染状矿石的Re-Os等时线年龄具有一定的不确定性,应慎重使用。浸染状矿石的Re-Os等时线年龄偏老原因多被解释为地壳混染引起的Os同位素不均一所致,但研究显示:红旗岭1号岩体和2号岩体均有一定量的地壳物质混入,浸染状矿石的^187 Os与^188 Os初始比值分别为0.215±0.043和0.302±0.089,γOs值分别为67.5-155.8和113.9-206.9;且2号岩体地壳物质混入量略高于1号岩体,混入的壳源Os所占比例为20%-30%。这说明地壳物质混染并非是导致Os同位素不均一的主要原因,其主要原因仍需在今后的工作中深入研究;而地壳物质的混入可能是促进熔离成矿的关键因素。
The Hongqiling copper-nickel sulfide deposit mainly consists of No.1,No.2and No.7 ore-bearing intrusions.The Re-Os isochron age of No.2intrusion((215.0±24.0)Ma)is consistent with zircon SHRIMP U-Pb age of the intrusion,(212.2±2.6)Ma,but the Re-Os isochron age of No. 1intrusion((237.0±16.0)Ma)is greater than zircon SHRIMP U-Pb age of the No.1intrusion,(216. 0±5.0)Ma.All these data indicate that Re-Os isochron ages of disseminated ores are not completely reliable.The Re-Os isochron age is greater than zircon SHRIMP U-Pb age,which is usually interpreted as crustal contamination inducing heterogeneity of Os isotopic.However,the research shows that No.1 and No.2intrusions are mixed with some of the Earth's crust substance,and the mixing volume of No. 2intrusion is slightly higher than that of the No.1intrusion,which indicate that hybridization of crust materials is not the cause of heterogeneity in initial 187^Os/188^Os ratios,the major reason should be a further research.The initial ^187Os/^188Os ratios of No.1and No.2intrusions are 0.215±0.043and 0.302 ±0.089,andγOsvalues range from 67.5to 155.8and 113.9to 206.9,respectively,which indicate that the ore-forming intrusions interfuse some crustal materials with possibly 20%-30% crustal Os contamination in Hongqiling area,and crustal materials might be the key factor to promote liquation ore formation.