赞皇杂岩官都岩群时代与物源——来自黑云变粒岩与石英岩碎屑锆石U-Pb-Hf同位素与稀土元素组成的约束
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P588.34+6;P588.34+1

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国家自然科学基金(41972205,41772191,41672191);中国地质调查局项目(DD20221649,DD20190003,DD20190370)


Depositional age and provenance of the Guandu Group in the Zanhuang Complex,North China Craton:Constraints from detrital zircon U-Pb-Hf isotopic and rare earth element compositions in the biotite leptynite and quartzite
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    摘要:

    官都岩群是华北克拉通中部造山带赞皇杂岩中重要的变质火山-沉积岩系,经历了高绿片岩相-高角闪岩相变质,准确限定其沉积时代与物质来源对探究中部造山带新太古代-古元古代构造演化过程具有重要意义。利用LA-MC-ICP-MS (多接收激光剥蚀电感耦合等离子质谱仪)与TIMA (矿物自动分析系统)对官都岩群中黑云变粒岩与石英岩进行了锆石矿物包体、U-Pb-Hf同位素与稀土元素原位分析。根据碎屑锆石内部矿物包体组成、阴极发光图像特征与U-Pb年龄结果,认为黑云变粒岩与石英岩中碎屑锆石中最年轻一组的207Pb/206Pb谐和年龄分别为2 544 Ma或2 536 Ma,大致限定了其原岩的最老沉积时代,结合区内黄岔花岗岩岩体侵入官都岩群的野外地质关系,推测官都岩群沉积时代为新太古代末期,并非古元古代。官都岩群黑云变粒岩与石英岩碎屑锆石年龄图谱十分相似,最主要的峰值年龄为2 512 Ma,结合碎屑锆石内部矿物包体与结构特征,认为官都岩群主要物源为新太古代晚期中酸性岩浆岩。两阶段锆石Hf模式年龄揭示2 850~2 700 Ma为赞皇杂岩最强烈的地壳生长阶段。综合本文与中部造山带已发表的数据,认为官都岩群黑云变粒岩与石英岩中变质锆石记录了~2 500 Ma的变质年龄,表明华北克拉通中部造山带普遍遭受了~2 500 Ma变质作用,该期变质作用可能与新太古代晚期华北克拉通初步克拉通化有关。

    Abstract:

    The Guandu Group, which has undergone high greenschist to high amphibolite facies metamorphism, is an important meta-volcanic and meta-sedimentary rock sequence in the Zanhuang Complex of the Trans-North China Orogen, North China Craton. Depositional age and provenance of the Guandu Group are vital for understanding the Neoarchean-Paleoproterozoic tectonic evolution of the Trans-North China Orogen. In this study, LA-MC-ICP-MS (laser ablation multi-collector inductively coupled plasma mass spectrometry) and TIMA (tescan inergrated mineral analyser) were used to analyze mineral inclusions, U-Pb-Hf isotope and rare earth element compositions of zircons in the biotite leptynite and quartzite in the Guandu Group. Based on the mineral inclusions, internal structure, and U-Pb ages of zircons, the concordant 207Pb/206Pb age of 2 544 Ma or 2 536 Ma in the youngest group of detrital zircons is chosen as the maximal depositional timing of the Guandu Group. Combined with the geological relationship which the Guandu Group was intruded by the Huangcha granites, it is speculated that the depositional age of the Guandu Group wasn’t Paleoproterozoic but late Neoarchean. Detrital zircon age patterns from the biotite leptynite and quartzite samples are similar and are characterized by the major peak of 2 512 Ma. Combined with the mineral inclusions and internal structure of the detrital zircons, it is suggested that the main provenance of the Guandu Group is the late Neoarchean intermediate-acid magmatic rocks. Two stage Hf isotopic model ages of detrital zircon reveals that the intensive crustal growth in the Zanhuang Complex was concentrated from 2 850 Ma to 2 700 Ma. In addition, the new and published data from the Trans-North China Orogen reveal that the zircons in the Guandu Group recorded the consistent metamorphic age of ca. 2 500 Ma, similar to other complexes in the Trans-North China Orogen, indicating that the Trans-North China Orogen also experienced an intense regional metamorphism in ca. 2 500 Ma, which may be related to the late Neoarchean initial cratonization of the North China Craton.

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刘平华,杨崇辉,杜利林,田忠华,邹雷,王义龙,张宇佳,2022,赞皇杂岩官都岩群时代与物源——来自黑云变粒岩与石英岩碎屑锆石U-Pb-Hf同位素与稀土元素组成的约束[J].岩石矿物学杂志,41(2):247~280. LIU Ping-hua, YANG Chong-hui, DU Li-lin, TIAN Zhong-hua, ZOU Lei, WANG Yi-long, ZHANG Yu-jia,2022,Depositional age and provenance of the Guandu Group in the Zanhuang Complex, North China Craton:Constraints from detrital zircon U-Pb-Hf isotopic and rare earth element compositions in the biotite leptynite and quartzite[J]. Acta Petrologica et Mineralogica,41(2):247~280.

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  • 收稿日期:2021-09-30
  • 最后修改日期:2021-12-15
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  • 在线发布日期: 2022-03-21
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