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Major transition of continental basalts in the Early Cretaceous: Implications for the destruction of the North China Craton
Wu, Kai1,6; Ling, Ming-Xing2,5; Sun, Weidong3,4,5; Guo, Jia1,6; Zhang, Chan-Chan1,6
2017-10-20
发表期刊CHEMICAL GEOLOGY
卷号470页码:93-106
文章类型Article
摘要Geochemical compositions of continental basalts are generally considered as the best proxy record of the chemical and isotopic evolution of subcontinental lithosphere and convective mantle. There are voluminous Cretaceous continental basalts in the North China Craton (NCC), which are mainly composed of alkali basalts with minor sub-alkali basalts. Abrupt changes in chemical and isotopic compositions of these basalts were often ascribed to subcontinental lithosphere thinning of the NCC. However, processes responsible for such changes and its implications for subcontinental lithosphere evolution remain obscure. Here we report major geochemical changes at similar to 108 Ma in the north part of the NCC. The > 108 Ma alkali basalts are characterized by negative epsilon(Nd)(t) and declining "island arc-like" geochemical characteristics from the east to the west, implying decreasing slab-derived components from westward subducting slabs in their metasomatized lithospheric mantle sources. In contrast, the < 108 Ma Cretaceous alkali basalts have depleted Sr-Nd isotopic compositions and "OIB-like" geochemical features. These observations suggest that westward subduction of the Paleo-Pacific plate was responsible for the Cretaceous basaltic activities in the NCC. Combined with plate reconstructions and geophysical observations, we propose that flat subduction of the "extinct" ridge between the Izanagi and the Pacific plates controlled this major transition as well as the destruction of the NCC. The transition from a supra-subduction zone environment to a within-plate extensional environment around 108 Ma is probably due to the eastward slab rollback and the northward shift of the spreading ridge.
关键词Ridge Subduction Alkali Basalt The Pacific Plate North China Craton Lithosphere Thinning
DOI10.1016/j.chemgeo.2017.08.025
收录类别SCI
语种英语
WOS记录号WOS:000412550700007
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被引频次:3[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/337002/143200
专题深海极端环境与生命过程研究中心
作者单位1.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangzhou 510640, Guangdong, Peoples R China
2.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China
3.Chinese Acad Sci, Inst Oceanog, Ctr Deep Sea Res, Qingdao 266071, Peoples R China
4.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China
5.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
6.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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Wu, Kai,Ling, Ming-Xing,Sun, Weidong,et al. Major transition of continental basalts in the Early Cretaceous: Implications for the destruction of the North China Craton[J]. CHEMICAL GEOLOGY,2017,470:93-106.
APA Wu, Kai,Ling, Ming-Xing,Sun, Weidong,Guo, Jia,&Zhang, Chan-Chan.(2017).Major transition of continental basalts in the Early Cretaceous: Implications for the destruction of the North China Craton.CHEMICAL GEOLOGY,470,93-106.
MLA Wu, Kai,et al."Major transition of continental basalts in the Early Cretaceous: Implications for the destruction of the North China Craton".CHEMICAL GEOLOGY 470(2017):93-106.
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