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Variations in the geochemical structure of the mantle wedge beneath the northeast Asian marginal region from pre- to post-opening of the Japan Sea

文献类型：期刊论文

作者Chen, Shuang-shuang1,2; Liu, Jia-qi1; Chen, Sheng-sheng2,3; Guo, Zheng-fu1; Sun, Chun-qing1,2
刊名LITHOS
出版日期2015-05-01
卷号224页码:324-341
关键词Basalt Deep asthenospheric process Mantle wedge Japan Sea northeast Asia
DOI10.1016/j.lithos.2015.03.008
文献子类Article
英文摘要Deep asthenospheric processes and the dynamic mechanism of magmatism in the northeast Asian marginal region are of significant interest but have been difficult to study in detail. We completed comprehensive studies on Japan Sea basalts including petrography, whole-rock major and trace elements, Sr-Nd-Pb isotopic compositions, and K-Ar geochronology, then combined our results with previous research to study the tectonic evolution of northeast Asia. The Japan Sea basalts, divided into Upper and Lower layers of Site 794 (US794, 1,5794), and Upper and Lower layers of Site 797 (US797,LS797) based on their stratigraphic level, belong to the calc-alkalic series and are characterized by flat HREE with significantly positive anomalies of Ba, Sr, and Pb, and slight anomalies of Eu (delta Eu = 0.81-121). The US797 sample group has lower LREE, LILE and relatively depleted radioactive isotope ratios (Sr-87/Sr-86 = 0.704051-0.704254; Nd-143/Nd-44, = 0.513035-0.513139; Pb-206/Pb-204 = 17.758-18.223), whereas the sample groups LS797, US794, and LS794 have relatively higher incompatible elements and slightly enriched isotopic values (Sr-87/Sr-86 = 0.704248-0.705222; Nd-143/Nd-144 = 0.512705-0.512917; Pb-206/Pb-204 = 18.077-18.377) due to the involvement of Pacific subducted fluid and sediments. K-Ar and Ar-40-Ar-39 geochronological data indicate age ranges of LS797, US794, and LS794 samples of 17.7 +/- 0.5-212 +/- 0.8 Ma, significantly older than those of US797 (15.1 +/- 0.9-17.2 +/- 0.7 Ma). Our data compiled with other data show sharply defined Sr-Nd isotopic variations of the Cenozoic basalts from Sikhote-Alin, the Japan Sea, the back-arc side of NE Japan and SW Hokkaido, and north Hokkaido from a slightly enriched to a depleted isotopic signature at 23-24 Ma, 17 +/- 2 Ma (15-19 Ma), 15 Ma, and >12 Ma, respectively, indicating that the upwelling asthenosphere beneath northeast Asia progressed eastward relative to the lithosphere. We conclude that the temporal and spatial variations of basaltic magma sources in the northeast Asian marginal region are closely associated with the extension of the Japan Sea. (C) 2015 Elsevier B.V. All rights reserved.
WOS关键词BACK-ARC BASIN ; ND ISOTOPIC COMPOSITIONS ; MIOCENE BASALTIC ROCKS ; VOLCANIC-ROCKS ; TRACE-ELEMENT ; NE JAPAN ; CONTINENTAL-CRUST ; MAGMA SOURCE ; ISLAND-ARC ; CHEMICAL CLASSIFICATION
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000354342100021
资助机构National Natural Science Foundation of China(41476034 ; National Natural Science Foundation of China(41476034 ; 41272369 ; 41272369 ; 40802038 ; 40802038 ; 41320104006 ; 41320104006 ; 41302102) ; 41302102) ; National Natural Science Foundation of China(41476034 ; National Natural Science Foundation of China(41476034 ; 41272369 ; 41272369 ; 40802038 ; 40802038 ; 41320104006 ; 41320104006 ; 41302102) ; 41302102)
源URL[http://ir.iggcas.ac.cn/handle/132A11/62533]  
专题地质与地球物理研究所_中国科学院新生代地质与环境重点实验室
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geolag & Environm, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Tibet Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 10085, Peoples R China
推荐引用方式
GB/T 7714		 Chen, Shuang-shuang,Liu, Jia-qi,Chen, Sheng-sheng,et al. Variations in the geochemical structure of the mantle wedge beneath the northeast Asian marginal region from pre- to post-opening of the Japan Sea[J]. LITHOS,2015,224:324-341.
APA Chen, Shuang-shuang,Liu, Jia-qi,Chen, Sheng-sheng,Guo, Zheng-fu,&Sun, Chun-qing.(2015).Variations in the geochemical structure of the mantle wedge beneath the northeast Asian marginal region from pre- to post-opening of the Japan Sea.LITHOS,224,324-341.
MLA Chen, Shuang-shuang,et al."Variations in the geochemical structure of the mantle wedge beneath the northeast Asian marginal region from pre- to post-opening of the Japan Sea".LITHOS 224(2015):324-341.

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来源：地质与地球物理研究所

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