小兴安岭东南段重要铅锌多金属、钼矿床的成矿年龄

MINERALIZATION AGE OF THE SIGNIFICANT LEAD-ZINC POLYMETAL AND MOLYBDENUM DEPOSITS IN SOUTHEASTERN XIAOXINGANLING METALLOGENIC BELT

摘要: 小兴安岭成矿带东南段是我国东北地区重要的铅锌多金属矿化、钼矿化集中区之一，成矿作用与区内花岗质岩浆侵入作用密切相关，铅锌多金属矿床成因类型为夕卡岩型，钼矿床成因类型为斑岩型.对区内典型矿床进行锆石精确测年研究结果表明，铅锌多金属矿床成矿年龄集中在175.8~209 Ma，鹿鸣钼矿床成矿年龄为176±4 Ma.认为铅锌多金属矿的（主）成矿期为印支晚期-燕山早期，钼矿成矿期为燕山早期.

Abstract: The southeast of Xiaoxinganling metallogenic belt is one of the significant concentration areas for Pb-Zn polymetal and Mo metallogenesis in Northeast China. The mineralization is closely related to the intrusion of granitic magma. The Pb-Zn deposits genetically belong to skarn polymetal ore type; while the Mo deposits, porphyry type. The zircon U-Pb dating for typical deposits shows that the Pb-Zn mineralization ages range between 175.8 and 209 Ma; while the Mo mineralization, 176±4 Ma. It is thus suggested that the Pb-Zn mineralization age is Late Indosinian-Early Yanshanian, and Mo mineralization is Early Yanshanian.