| 东昆仑地区驼路沟钴(金)矿床硅质钠长岩锆石U-Pb定年及Hf同位素特征研究 |
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| 引用本文： | 余福承,陈静,黄广文,杨雪松,丛殿阁,邱炜.东昆仑地区驼路沟钴(金)矿床硅质钠长岩锆石U-Pb定年及Hf同位素特征研究[J].新疆地质,2021(1):67-74. |
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| 作者姓名： | 余福承 陈静 黄广文 杨雪松 丛殿阁 邱炜 |
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| 作者单位： | 青海省地质调查院;青海师范大学地理科学学院;东华理工大学核资源与环境国家重点实验室;青海大学地质系 |
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| 基金项目： | 国家自然科学基金(41862011);青海学者专项资金(QHS201802);青海省科技厅应用基础研究计划(2018-ZJ-779)项目联合资助。 |
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| 摘 要： | 东昆仑驼路沟钴(金)矿床是青海省发现的首个独立大型喷流沉积型矿床,说明容矿围岩为一套海相火山-沉积岩系。本文在野外调查的基础上,对该矿区短沟矿段YM1坑口的硅质钠长岩进行岩石学、LA-ICP-MS锆石UPb年代学及Hf同位素分析。结果表明,区内钠长岩的形成年龄为(457.3±4.6)Ma,佐证了该矿区喷流作用成岩与成矿的同时性;另外获得9.20~1.10 Ga和2.40~2.50 Ga的2个年龄集中区,说明了研究区基底演化和源区物质的复杂性。Hf同位素显示为两个集中区,其中年龄峰值422~459 Ma的锆石获得εHf(t)值为-0.61~12.72,表明锆石母岩主要为新生的地壳物质,指示硅质钠长岩的形成与海底火山喷发作用密切相关;另外0.85~1.10 Ga的锆石εHf(t)值为-15.09~-0.07,其锆石母岩中主要为再造的古老地壳,表明该区基底源区物质的复杂性。通过区域对比分析,认为驼路沟矿区含矿火山-沉积岩系形成时代与钠长岩年龄、成矿年龄非常接近,喷流沉积时代应为晚奥陶世。
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| 关 键 词： | 钠长岩 U-PB定年 HF同位素 驼路沟钴(金)矿 东昆仑 |
Albite U-Pb dating and Hf characteristics of Tuolugou cobalt(gold)deposit in East Kunlun |
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| Yu Fucheng,Chen Jing,Huang Guangwen,Yang Xuesong,Cong Diange,Qiu wei.Albite U-Pb dating and Hf characteristics of Tuolugou cobalt(gold)deposit in East Kunlun[J].Xinjiang Geology,2021(1):67-74. |
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| Authors: | Yu Fucheng Chen Jing Huang Guangwen Yang Xuesong Cong Diange Qiu wei |
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| Institution: | (Qinghai Geological Survey Institute,Key Laboratory of the Northern Qinghai–Tibet Plateau Geological Processes and Mineral Resources,Xining,Qinghai,810012,China;Qinghai normal university,school of geographic sciences,Xining,Qinghai,810000,China;State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang,Jiangxi,330013,China;Geological Engineering Department of Qinghai University,Xining,Qinghai,810016,China) |
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| Abstract: | Tuolugou cobalt(gold)deposit is the first independent large-scale jet-sedimentary deposit discovered in East Kunlun,Qinghai province.The host rock is a set of marine volcanic-sedimentary rocks.On the basis of field investigation,petrology,LA-ICP-MS zircon U-Pb geochronology and Hf isotope analysis of siliceous albite at the mouth of Ym1 pit were carried out in the Xiaogou ore block of the mining area.The results show that the formation age of albite in the area is 457.3±4.6 Ma,which further supports the simultaneity of exhalation diagenesis and mineralization.Besides,two age concentration zones of 9.20~1.10 Ga and 2.40~2.50 Ga were obtained,which represented the basement evolution of the study area and the material complexity of the source area.Hf isotopes indicate two concentration areas,where zircons with age peaks ranging from 422 to 459 Ma with the Hf(T)value of-0.61 to 12.72,indicating that the zircons'parent rocks are mainly composed of newly formed crustal materials,indicating that the formation of silicic sodium feldspar is closely related to submarine volcanic eruptions.In addition,the zircon with age of 0.85~1.10 Ga have Hf(T)value of is-15.09~-0.07,and the primary rocks of the zircons are mainly the reconstructed ancient crust,indicating the complexity of the materials in the basement source area.Through regional comparison and analysis,it is concluded that the formation age of volcanic sedimentary rocks in Tuolugou mine is very close to the age of sodium feldspar and metallogenic age,and the age of jet deposition should be late Ordovician. |
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| Keywords: | Albite U-Pb dating Hf isotope Tuolugou cobalt(gold)deposit East Kunlun |
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