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Crust recycling induced compositional-temporal-spatial variations of Cenozoic basalts in the Trans-North China Orogen
Xu, Rong1; Liu, Yongsheng1; Wang, Xiaohong1,2; Zong, Keqing1; Hu, Zhaochu1; Chen, Haihong1; Zhou, Lian1
2017-03-01
发表期刊LITHOS
卷号274页码:383-396
文章类型Article
摘要It has been advocated that the stagnant Pacific slab within the mantle transition zone played a critical role in the genesis of the Cenozoic basalts in the eastern part of the North China Craton (NCC); however, it is not clear whether this recycled oceanic crust contributed to the chemical makeup of the Cenozoic basalts in the Trans North China Orogen (TNCO, the central zone of the NCC). Here, we show that Cenozoic basalts from the TNCO are featured by low CaO contents, high TiO2 and FeOT contents and high Fe/Mn and Zn/Fe ratios, indicating a mantle source of pyroxenite. Temporally, these basalts evolved from alkali basalts of Late Eocene-Oligocene age to coexisting alkali and tholeiitic basalts of Late Miocene-Quaternary age. Spatially, their isotopic and chemical compositions vary symmetrically from the center to both the north and the south sides along the TNCO, i.e., SiO2 contents and Sr-87/Sr-86 ratios increase, FeOT contents and Nd-143/Nd-144, Sm/Yb and Ce/Pb ratios decrease. The estimated average melting pressure of the TNCO tholeiitic basalts (similar to 3 GPa) agrees well with the present lithosphere thickness beneath the north region of the TNCO (similar to 90-120 km). The temporal and spatial chemical variations of Cenozoic basalts in the TNCO suggest that the recycled oceanic crust in the mantle of the TNCO is mainly related to the southward subduction of the Paleo-Asian oceanic plate and the northward subduction of the Tethyan ocean plate. The westward subduction of Pacific slab may not have contributed much than previously thought. (C) 2017 Elsevier B.V. All rights reserved.
关键词Cenozoic Basalt North China Craton Pyroxenite Recycled Oceanic Crust Trans-north China Orogen
DOI10.1016/j.lithos.2016.12.024
收录类别SCI
语种英语
WOS记录号WOS:000397375400023
引用统计
被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
版本出版稿
条目标识符http://ir.qdio.ac.cn/handle/337002/136766
专题海洋地质与环境重点实验室
作者单位1.China Univ Geosci, Sch Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China
2.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China
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Xu, Rong,Liu, Yongsheng,Wang, Xiaohong,et al. Crust recycling induced compositional-temporal-spatial variations of Cenozoic basalts in the Trans-North China Orogen[J]. LITHOS,2017,274:383-396.
APA Xu, Rong.,Liu, Yongsheng.,Wang, Xiaohong.,Zong, Keqing.,Hu, Zhaochu.,...&Zhou, Lian.(2017).Crust recycling induced compositional-temporal-spatial variations of Cenozoic basalts in the Trans-North China Orogen.LITHOS,274,383-396.
MLA Xu, Rong,et al."Crust recycling induced compositional-temporal-spatial variations of Cenozoic basalts in the Trans-North China Orogen".LITHOS 274(2017):383-396.
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