中文摘要：

高岗山钼矿床是小兴安岭—张广才岭成矿带上首次发现的早三叠世斑岩型钼矿床,对其进行详细的年代学研究,对于研究区域构造演化和拓展找矿方向具有重要意义.为确定高岗山钼矿床的成岩成矿时代,本文开展了同位素年代学的研究.本次用LA-ICP-MS U-Pb方法对矿区内的片麻状花岗闪长岩和与成矿有关的花岗斑岩中的锆石进行了测试,获得其年龄分别为459.8±2.7Ma和259.9±2.0 Ma,说明片麻状花岗闪长岩是中奥陶世时洋壳向松嫩-张广才岭地块俯冲形成的,花岗斑岩是晚二叠世时“佳蒙地块”与华北板块北缘东段碰撞形成的.对矿石中的辉钼矿的Re-Os同位素分析,获得其加权平均年龄为250.2±1.4 Ma,等时线年龄为247±6 Ma,这与成矿岩体的侵位年龄基本一致.

英文摘要：

The Gaogangshan deposit is the first discovered Early Triassic porphyry molybdenum deposit in the Xiaoxing＇anling-Zhangguangcailing metallogenic belt.Studies on the timing of the intrusive rocks and mineralization provide a significant implication in better understanding of regional tectonic evolution and ore prospecting.LA-ICP-MS U-Pb dating of zircon in gneissic granodiorite gave a weighted average age of 459.8 ± 2.7 Ma,indicating its emplacement in the Middle Ordovician during the westward subduction of the ocean crust under the Songnen-Zhangguangcailing microplate.Dating of zircon in granitic porphyry yielded a weighted average age of 259.9 ± 2.0 Ma,corresponding to the Late Permian collision between Jiamusi-Mongolia block and the eastern segment of the northern margin of the North China Plate.Re-Os dating of molybdenum ore gave an isochron age of 250.2±1.4 Ma and a weighted average age of 247±6 Ma,consistent with the emplacing age of granitic porphyry.