Petrogenesis and geochemistry of circa 2.5 Ga granitoids in the Zanhuang Massif: Implications for magmatic source and Neoarchean metamorphism of the North China Craton
Petrogenesis and geochemistry of circa 2.5 Ga granitoids in the Zanhuang Massif: Implications for magmatic source and Neoarchean metamorphism of the North China Craton
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赞皇地块约2.5 Ga花岗岩类岩石成因及地球化学：对华北克拉通岩浆源及新太古代变质作用的启示
DOI：
10.1016/j.lithos.2016.10.028
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发表时间：
2017
期刊：
影响因子：
3.5
通讯作者：
Fu Dong
中科院分区：
文献类型：
--
作者：
Wang Junpeng;Kusky Timothy;Wang Lu;Polat Ali;Wang Songjie;Deng Hao;Fu Jianmin;Fu Dong
华北陆块晚太古代-早古元古代（约2.5Ga）的构造格局，由于后期强烈的变形和变质叠加事件，至今仍缺乏全面的认识。2.5Ga左右的岩浆活动和变质活动在华北克拉通广泛分布，可以作为更好地理解这一时期构造演化的有效靶点。本文在野外、构造、地球化学、年代学和Sm-Nd同位素研究的基础上，对华北克拉通中央造山带东缘赞皇地块郝庄岩体进行了研究。花岗岩类主要包括未变形伟晶岩和花岗闪长岩。1个伟晶岩和2个花岗闪长岩样品的锆石207 Pb/206 Pb年龄分别为2513 ± 29 Ma、2511 ± 36 Ma和2528 ± 18 Ma。花岗闪长岩具有变辉岩、钾玄岩-高钾钙碱性系列特征，与A型花岗岩有亲合性。约2.5Ga的花岗闪长岩具有高的负εNd（t）值（− 29.22 ~ − 33.12），TDM模式年龄介于2671 ~ 3151 Ma之间。全岩常量元素、微量元素和Sm-Nd同位素研究表明，郝庄花岗闪长岩不是地幔源区，而是由古老增厚的TTG地壳部分熔融而成，形成于与俯冲有关的构造环境。通过与赞皇岩体中其他年龄相近的花岗质岩石的地球化学对比研究，认为这些花岗质岩石在岩浆演化过程中可能存在一定的相关性。结合前人对2.5Ga左右基性岩脉群的地球化学和同位素研究，我们认为，这两个基性岩脉群是由富平/五台岛弧与华北克拉通东部地块在西倾板片之上发生弧-陆碰撞后，由一次东倾俯冲极性反转事件产生的。东倾俯冲导致富集的岩石圈地幔部分熔融，首先形成约2.5Ga的基性岩脉，并在中央造山带和东部陆块发生了广泛的约2.5Ga变质作用，随后这些基性岩脉群的母岩浆加热了古老增厚的TTG地壳，并在后期形成了年龄相近的花岗质岩石。
The tectonic framework of the North China Craton (NCC) during late Archean to early Paleoproterozoic (circa 2.5 Ga) is still lacking comprehensive understanding due to subsequent strong deformation and metamorphic overprinting events. Circa 2.5 Ga magmatic and metamorphic activities are widely spread throughout the NCC, which can be used as an efficient target to better understand the tectonic evolution at this period. In this study, based on a detailed field, structural, geochemical, geochronological and Sm–Nd isotopic study, we focus our work on the Haozhuang granitoids in the Zanhuang Massif located at the eastern margin of the Central Orogenic Belt of the NCC. The granitoids mainly include undeformed pegmatite and granodiorite. One pegmatite and two granodiorite samples yield zircon207Pb/206Pb ages of 2513 ± 29 Ma, 2511 ± 36 Ma and 2528 ± 18 Ma, respectively. The granodiorites show metaluminous and shoshonitic to high-K calc-alkaline series characteristics with A-type granite affinity. The circa 2.5 Ga granodiorites have highly negative εNd(t) values (− 29.22 ~ − 33.12) and TDMmodel ages between 2671 Ma and 3151 Ma. This work shows clearly, from whole-rock major and trace elements and Sm–Nd isotopic studies, that the Haozhuang granodiorites were derived from partial melting of old and thickened TTG crust rather than mantle sources, and formed in a subduction-related tectonic setting. With geochemical comparison studies to other similar-aged granitic rocks in the Zanhuang Massif, we suggest that these granitic rocks possibly have a certain correlation during the magma evolution. Coupled with our previous geochemical and isotopic studies on circa 2.5 Ga mafic dike swarms, we propose that the similar-aged granitic rocks and mafic dike swarms were produced by an east-dipping subduction polarity reversal event following an arc–continent collision between the Fuping/Wutai island arc and Eastern Block of the NCC above a west-dipping slab. The east-dipping subduction resulted in partial melting of the enriched lithospheric mantle, firstly forming the circa 2.5 Ga mafic dikes inducing the widespread circa 2.5 Ga metamorphism in the Central Orogenic Belt and the Eastern Block, and then the parental magma of these mafic dike swarms heated the old and thickened TTG crust causing the formation of similar-aged granitic rocks at a later stage.
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影响因子：
3.8
作者：
Lianchang Zhang;M. Zhai;Xiaojing Zhang;Peng Xiang;Yanpei Dai;Changle Wang;F. Pirajno
通讯作者：
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影响因子：
6.1
作者：
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通讯作者：
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影响因子：
3.8
作者：
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通讯作者：
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影响因子：
6.1
作者：
M. Santosh;Qiong-Yan Yang;E. Shaji;T. Tsunogae;M. Mohan;M. Satyanarayanan
通讯作者：
M. Santosh;Qiong-Yan Yang;E. Shaji;T. Tsunogae;M. Mohan;M. Satyanarayanan
华北克拉通西北缘新太古代晚期幕式地幔熔融-地壳改造:阴山地块岩浆岩和变质岩的锆石年龄
影响因子：
3.8
作者：
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通讯作者：
Zhang, Liqao