Crust recycling induced compositional-temporal-spatial variations of Cenozoic basalts in the Trans-North China Orogen

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	Crust recycling induced compositional-temporal-spatial variations of Cenozoic basalts in the Trans-North China Orogen
	Xu, Rong 1; Liu, Yongsheng 1; Wang, Xiaohong 1,2; Zong, Keqing 1; Hu, Zhaochu 1; Chen, Haihong 1; Zhou, Lian 1
刊名	LITHOS
	2017-03-01
卷号	274 页码:383-396
关键词	Cenozoic basalt North China Craton Pyroxenite Recycled oceanic crust Trans-North China Orogen
英文摘要	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.
收录类别	SCI
语种	英语
WOS记录号	WOS:000397375400023
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.qdio.ac.cn/handle/337002/136766]
专题	海洋研究所_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
推荐引用方式 GB/T 7714	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.