CAJ | 학술논문

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。
길림홍기령동얼류화물광상주요유1호、2호급7호함광암체조성，주요광석류형위침염상광석。기 Re Os 등시선년령연구현시：2호암체 Re Os 등시선년령（（215．0±24．0）Ma）여암체적고석SHRIMP U Pb 년령（（212．2±2．6）Ma）일치；이1호암체 Re Os 등시선년령（（237．0±16．0）Ma）칙명현로우암체적고석 SHRIMP U Pb 년령（（216．0±5．0）Ma）。저표명침염상광석적 Re Os 등시선년령구유일정적불학정성，응신중사용。침염상광석적 Re Os 등시선년령편로원인다피해석위지각혼염인기적 Os 동위소불균일소치，단연구현시：홍기령1호암체화2호암체균유일정량적지각물질혼입，침염상광석적187 Os 여188 Os 초시비치분별위0．215±0．043화0．302±0．089，γOs 치분별위67．5～155．8화113．9～206．9；차2호암체지각물질혼입량략고우1호암체，혼입적각원 Os 소점비례위20％～30％。저설명지각물질혼염병비시도치 Os 동위소불균일적주요원인，기주요원인잉수재금후적공작중심입연구；이지각물질적혼입가능시촉진용리성광적관건인소。
The Hongqiling copper-nickel sulfide deposit mainly consists of No.1,No.2 and No.7 ore-bearing intrusions.The Re Os isochron age of No.2 intrusion ((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.1 intrusion((237.0±16.0)Ma)is greater than zircon SHRIMP U Pb age of the No.1 intrusion, (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.2 intrusions are mixed with some of the Earth’s crust substance,and the mixing volume of No.2 intrusion is slightly higher than that of the No.1 intrusion,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 187 Os/188 Os ratios of No.1 and No.2 intrusions are 0.215 ± 0.043 and 0.302 ± 0.089,and γOs values range from 67.5 to 155.8 and 113.9 to 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.