广西苍梧县武界钨钼矿点成岩成矿年龄及岩体地球化学特征

广西苍梧县武界钨钼矿点是大瑶山南缘新发现的与花岗闪长岩有关的矽卡岩一石英脉型钨钼矿点。为了评价其找矿前景，对其成岩成矿年龄和与成矿有关的花岗闪长岩地球化学特征进行了研究。结果表明，与成矿有关的花岗闪长岩LA-ICP-MS锆石u-Pb年龄加权平均值为（434．5±0．84）Ma，6个辉钼矿Re-0s模式年龄加权平均值为（438．4±3．3）Ma，上述年龄与相邻的社洞钨钼矿床成岩成矿年龄基本相同，即大致集中在（435±5）Ma，证实上述两个矿床（点）钨钼矿均形成于早志留世（加里东期），与花岗闪长岩密切相关。武界矿点与相邻的社洞钨钼矿床具有类似的成岩成矿条件、岩体地球化学特征和蚀变矿化特征，具有一定的找矿前景。近年的新资料表明，大瑶山地区可划分出加里东期斑岩-矽卡岩-石英脉型钨钼铜矿成矿系列。该成矿系列是今后大瑶山地区寻找矽卡岩一斑岩型W-Mo-Cu矿床的主攻方向之一。

Emplaced and Metallogenetic Ages of Wujie Tungsten and Molybdenum Occurrence and Geochemical Characteristics of Granodiorite in Cangwu

Wujie tungsten and molybdenum occurrence in Cangwu, southern margin of Dayaoshan uplift is a newly-discovered quartz-skarn type occurrenc. Zircon LA - ICP - MS U - Pb dating of granodiorite gained the is- ochrone age of （434.5 ±0. 84 ） Ma, and Re - Os weighted average model age of the molybdenites hosted in quartz vein is （438.4±3.3 ） Ma. The ages of diagenetic and metallogenic of Wujie occurrence are similar to those of adjacent Shedong tungsten and molybdenum deposit, suggesting that the two deposits （occurrence） were formed in early Silurian （ Caledonian period） , and is closely related to granodiorite. Wujie occurrence has pros- pecting future owing to similar diagenetic and metallogenic condition, rock geochemical characteristics and alter- ation features contracting to adjacent Shedong deposit. Recent data indicate that a porphyry-skarn-quartz vein type W - Mo - Cu metaUogenic series during Caledonian period can be classified in Dayaoshan uplift. This met- allogenic series is one of the main directions for looking for porphyry-skarn-quartz vein type W - Mo - Cu deposit in Dayaoshan Uplift.