中文摘要：

对金沙江—红河成矿带南段铜厂斑岩铜钼矿区含矿的石英正长斑岩和无矿的细粒正长岩开展了锆石的Ce^4＋/Ce^3＋比值、δCe及δEu值的研究,结果显示含矿的4个石英正长斑岩样品的锆石Ce^4＋/Ce^3＋比值变化范围为208～336,平均比值为265,δCe值变化范围为17.6～60.6,平均值为33.8,δEu值变化范围为0.592～0.628,平均值为0.611,不含矿的1个细粒正长岩样品的锆石Ce^4＋/Ce^3＋比值为61,δCe值为8.50,δEu值为0.424,含矿的石英正长斑岩的锆石Ce^4＋/Ce^3＋比值、δCe及δEu值均明显高于不含矿的细粒正长岩,反映了与成矿有关的岩浆具有相对高的氧化状态。对比金沙江—红河成矿带北段的玉龙斑岩铜钼矿带和中段的马厂箐斑岩铜钼矿的含矿与无矿岩体,它们的锆石Ce^4＋/Ce^3＋比值与南段铜厂斑岩铜钼矿含矿及无矿岩体具有基本类似的特征,含矿岩体的锆石Ce^4＋/Ce^3＋比值通常大于200,而不含矿岩体的锆石Ce^4＋/Ce^3＋比值基本上都小于120。这种差异对进一步认识金沙江—红河成矿带斑岩铜钼矿的岩浆氧逸度特征具有重要的理论意义,对斑岩铜钼矿的找矿工作具有一定的指导意义。

英文摘要：

The Tongchang porphyry Cu-Mo deposit is situated in southern segment of the Jinshajiang-Red River metal- Iogenic belt. Ce^4＋/Ce^3＋ ratios, δCe and δEu of zircon from the Tongchang intrusions were investigated. Ce^4＋/Ce^3＋ ratios, δCe and δEu of zircon from four ore-bearing quartz syenite porphyry samples range from 208 to 336, 17.6 to 60. 6, 0. 592 to 0. 628, and with the averages of 265, 33.8 and 0. 611, respectively. However, Ce^4＋/Ce^3＋ ratio, δCe and δEu of zircon from one barren fine-grained syenite sample are 61, 8.50 and 0. 424, respectively. Ce^4＋/Ce^3＋ ratios, δCe and δEu of zircon from ore-bearing quartz syenite porphyry samples are all higher than those from barren fine-grained syenite sample, reflecting ore-bearing quartz syenite porphyry intrusions with higher oxidation state than barren fine-grained syenite intrusions. In contrast to Yulong porphyry Cu-Mo ore belt in northern segment and Machangqing porphyry Cu-Mo deposit in the central area of the Jinshajiang-Red River metallogenic belt, Ce^4＋/Ce^3＋ ratios of zircon from these deposits are basiclly similar, Ce^4＋/Ce^3＋ ratios of zircon from ore-bearing intrusions are generally 〉 200, whereas those from barren intrusions are 〈 120 on the whole. This is extremely helpful for understanding magmatic oxygen fugacity features of porphyry Cu-Mo deposits and exploration of porphyry Cu-Mo deposits in the Jinshajiang-Red River metallogenic belt to some extent.