| 锆石氧逸度对义敦岛弧南段中甸矿集区斑岩型矿床差异性成矿控制因素的指示 |
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| 引用本文： | 李守奎,刘学龙,卢映祥,张世涛,刘思晗,陈建航,李振焕,余海军,张传昱.锆石氧逸度对义敦岛弧南段中甸矿集区斑岩型矿床差异性成矿控制因素的指示[J].地球科学,2022,47(4):1435-1458. |
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| 作者姓名： | 李守奎 刘学龙 卢映祥 张世涛 刘思晗 陈建航 李振焕 余海军 张传昱 |
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| 作者单位： | 1.昆明理工大学国土资源工程学院, 云南昆明 650032 |
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| 基金项目： | 云南省科技厅科技计划项目(No.2019FA018)；;国家自然科学基金项目(No.41862009)； |
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| 摘 要： | 中甸铜钼多金属矿集区位于义敦岛弧南段，区内绝大多数矿床与晚三叠世和晚白垩世岩浆活动有关，目前两期斑岩锆石氧逸度及差异性成矿研究薄弱.对4个斑岩体5类岩石的锆石开展LA-ICPMS微量元素分析，数据经筛选检验后进行了氧逸度估算.氧逸度结果由高到低为:地苏嘎铜矿晚三叠世石英闪长玢岩（Ce4+/Ce3+比值为515）、休瓦促晚三叠世贫矿黑云母花岗岩（Ce4+/Ce3+比值为443）、铜厂沟钼铜矿晚白垩世花岗闪长斑岩（Ce4+/Ce3+比值为368）、热林钼矿晚白垩世二长花岗岩（Ce4+/Ce3+比值为237）、休瓦促钨钼矿晚白垩世二长花岗岩（Ce4+/Ce3+比值为104）.综合前人资料，认为俯冲或碰撞环境的斑岩型铜矿，高氧逸度是成矿的必要非充分条件，Cu铜主要直接或间接（有幔源贡献的新生下地壳）来自地幔；碰撞型斑岩矿床钼、钨主要来自古老地壳，对氧逸度的要求相对较低，偏氧化环境有利钼矿形成，偏还原环境有利于钨矿形成.矿产评价时，斑岩型铜矿应注重幔源/壳源比例和氧逸度条件的研究，斑岩型钼、钨矿不适用斑岩型铜矿氧逸度评价标准.
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| 关 键 词： | 氧逸度 差异性成矿 义敦岛弧 中甸矿集区 斑岩型矿床 锆石微量元素 矿床. |
| 收稿时间： | 2021-04-09 |
Indication of Zircon Oxygen Fugacity to Different Mineralization Control Factors of Porphyry Deposits in Zhongdian Ore-Concentrated Area,Southern Yidun Arc |
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| Li Shoukui,Liu Xuelong,Lu Yingxiang,Zhang Shitao,Liu Sihan,Chen Jianhang,Li Zhenhuan,Yu Haijun,Zhang Chuanyu.Indication of Zircon Oxygen Fugacity to Different Mineralization Control Factors of Porphyry Deposits in Zhongdian Ore-Concentrated Area,Southern Yidun Arc[J].Earth Science-Journal of China University of Geosciences,2022,47(4):1435-1458. |
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| Authors: | Li Shoukui Liu Xuelong Lu Yingxiang Zhang Shitao Liu Sihan Chen Jianhang Li Zhenhuan Yu Haijun Zhang Chuanyu |
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| Abstract: | Zhongdian Cu-Mo polymetallic ore-concentrated area is located in southern Yidun arc. The vast majority of deposits in this area are related to the two-stage magmatic activities of Late Triassic and Late Cretaceous. The research on the oxygen fugacity and differential mineralization of porphyry zircons in the two stages is currently weak.In this paper, LA-ICPMS trace element analysis was carried out on zircons from 5 types of rocks of 4 porphyry bodies, and the oxygen fugacity was estimated after the data were screened and tested.The calculated results of oxygen fugacity from high to low are: the Late Triassic quartz diorite porphyrite (Ce4+/Ce3+ value of 515) from the copper deposit in Disuga, the Late Triassic barren biotite granite (Ce4+/ Ce3+ value of 443) from Xiuwacu, the Late Cretaceous granodiorite porphyry (Ce4+/Ce3+ value of 368) from the molybdenum-copper deposit in Tongchanggou, the Late Cretaceous monzogranite (Ce4+/Ce3+ value of 237) from the molybdenum deposit in Relin, and the Late Cretaceous monzogranite (Ce4+/Ce3+ value of 104) from the tungsten-molybdenum deposit in Xiuwacu. Based on the previous research results, it is believed that Cu, either from a subduction-related porphyry copper deposit or a collision-related porphyry copper deposit, is mainly derived from the mantle, where high oxygen fugacity is necessary but insufficient in mineralization. The metallogenic elements of molybdenum and tungsten deposits related to collisional porphyry are predominantly derived from the ancient siliceous-alumina crust. Although the requirement in terms of oxygen fugacity is relatively low, oxygen fugacity is a major factor controlling the differential mineralization of molybdenum and tungsten. That is, the partially oxidized environment is favorable for the development of molybdenum deposits, while the partially reducing environment is favorable for the formation of tungsten deposits. When evaluating the mineral resources, more attention should be paid to the mantle source/crust source ratio and oxygen fugacity for porphyry copper deposits. The oxygen fugacity criteria in assessing the porphyry copper deposit should not be applied to the molybdenum and tungsten deposits, where a relatively lower oxygen fugacity or even partially reducing environment is still conducive to mineralization. |
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