气候变化领域集成服务门户(CCPortal): Variations in the geochemical structure of the mantle wedge beneath the northeast Asian marginal region from pre- to post-opening of the Japan Sea

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DOI	10.1016/j.lithos.2015.03.008
	Variations in the geochemical structure of the mantle wedge beneath the northeast Asian marginal region from pre- to post-opening of the Japan Sea
	Chen, Shuang-shuang; Liu, Jia-qi; Chen, Sheng-sheng; Guo, Zheng-fu; Sun, Chun-qing
通讯作者	Liu, JQ (通讯作者)
发表日期	2015
ISSN	0024-4937
EISSN	1872-6143
起始页码	324
结束页码	341
卷号	224
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.
关键词	ND ISOTOPIC COMPOSITIONS MIOCENE BASALTIC ROCKS VOLCANIC-ROCKS TRACE-ELEMENT NE JAPAN MAGMA SOURCE CHEMICAL CLASSIFICATION PALEOMAGNETIC EVIDENCE CRUSTAL CONTAMINATION SECULAR VARIATION
英文关键词	Basalt; Deep asthenospheric process; Mantle wedge; Japan Sea; northeast Asia
语种	英语
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
WOS类目	Geochemistry & Geophysics ; Mineralogy
WOS记录号	WOS:000354342100021
来源期刊	LITHOS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258453
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]. 中国科学院青藏高原研究所,2015,224.
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.
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).