CAJ | 학술논문

本文利用Re-Os同位素体系( ICP-MS方法)对1件辉钼矿和10件黄铁矿样品进行定年。1件辉钼矿的Re-Os模式年龄为（2376±37）Ma，10件黄铁矿获得了3组Re-Os年龄：①（2567±36）Ma~（2540±37）Ma（模式年龄）；②（2237±112）Ma（模式年龄）；③（1572±140）Ma（等时线年龄）。（2376±37）Ma的辉钼矿形成于古元古代，是目前中国已知最老的辉钼矿年龄之一，其成矿物质来自地壳，（2237±112）Ma的黄铁矿属于热液成因，其成矿物质来自地壳，（2376±37）Ma~（2237±112）Ma的Re-Os年龄代表了一次重要的热液改造事件；（2567±36）Ma~（2540±37）Ma的黄铁矿是原始沉积形成的，是目前中国已知最老的黄铁矿年龄，该年龄代表了2.5Ga形成BIF的地质事件；（1572±140） Ma的黄铁矿形成于中元古代，具有明显的壳源特征，该年龄代表了一次较晚期的热液改造事件。这些年龄为确定鞍本地区铁矿的热液活动时间提供了新的重要证据，对深入认识区域成矿规律和探讨地质构造演化具有重要意义。
본문이용Re-Os동위소체계( ICP-MS방법)대1건휘목광화10건황철광양품진행정년。1건휘목광적Re-Os모식년령위（2376±37）Ma，10건황철광획득료3조Re-Os년령：①（2567±36）Ma~（2540±37）Ma（모식년령）；②（2237±112）Ma（모식년령）；③（1572±140）Ma（등시선년령）。（2376±37）Ma적휘목광형성우고원고대，시목전중국이지최로적휘목광년령지일，기성광물질래자지각，（2237±112）Ma적황철광속우열액성인，기성광물질래자지각，（2376±37）Ma~（2237±112）Ma적Re-Os년령대표료일차중요적열액개조사건；（2567±36）Ma~（2540±37）Ma적황철광시원시침적형성적，시목전중국이지최로적황철광년령，해년령대표료2.5Ga형성BIF적지질사건；（1572±140） Ma적황철광형성우중원고대，구유명현적각원특정，해년령대표료일차교만기적열액개조사건。저사년령위학정안본지구철광적열액활동시간제공료신적중요증거，대심입인식구역성광규률화탐토지질구조연화구유중요의의。
Rhenium and osmium isotopes in a molybdenite sample and ten pyrite samples were used to determine the timing of mineralization by ICP-MS. Re-Os model age of the molybdenite sample is(2376 ± 37)Ma, Re-Os ages of the ten pyrite samples yielded three kinds of ages:①(2567±36)Ma—(2540±37)Ma (model age);②(2237±112)Ma (model dating);③(1572±140)Ma (isochron age). These data suggest that the molybdenite of(2376 ± 37)Ma was formed during early Proterozoic, and was the oldest Re-Os model age of molybdenite, the pyrite of(2237±112)Ma was formed during early Proterozoic, and both of them indicate that the molybdenite and the pyrite were derived from the crust and represented an important hydrothermal activity in 2.3 Ga;the pyrite of(2567 ± 36)Ma—(2540 ± 37)Ma was formed during new Archaeozoic period and yielded the oldest Re-Os model age, which indicates that the pyrite was formed with BIF in 2.5 Ga;the pyrite of(1572±140)Ma was formed during middle Proterozoic, which indicates that pyrite was derived from the crust and represented a hydrothermal activity. The Re-Os isotopic dating result provides a new proof for the existence of hydrothermal activity in iron deposits of the Anshan-Benxi area, and is also important for understanding the ore-forming processes and tectonic evolution in this area.