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Late Cenozoic basaltic lavas from the Changbaishan-Baoqing Volcanic Belt, NE China: Products of lithosphere-asthenosphere interaction induced by subduction of the Pacific plate
Song-Yue Yu; Yi-Gang Xu; Sheng-Hua Zhou; Jiang-Bo Lan; Lie-Meng Chen; Neng-Ping Shen; Jian-Xin Zhao; Yue-Xing Feng
2018
发表期刊Journal of Asian Earth Sciences
卷号164页码:260–273
摘要

Cenozoic intraplate basalts are low in volume but widespread in eastern China. They are predominantly alkaline and have oceanic island basalt (OIB)-like trace element compositions. Despite numerous studies, the origin of Cenozoic basalts in eastern China remains elusive. Possible roles of lithosphere thickness, subduction of Pacific plate and lithosphere-asthenosphere interaction in triggering spatial geochemical variations have not yet been clarified. Here, we have carried out mineral chemistry, major and trace element and Sr-Nd-Hf isotope analyses of the late Cenozoic (<20 Ma) basaltic rocks from the Changbaishan-Baoqing Volcanic Belt (CVB), NE China, which revealed clear spatial compositional variations. The North CVB is dominated by basanites and alkali basalts with OIB-like trace element patterns and depleted Sr-Nd-Hf isotopic compositions (Sr-87/Sr-86 = 0.7039-0.7047, epsilon(Nd) = 3-5.6; epsilon(Hf) = 6.7-12), which may have been derived from low degree partial melting of a depleted source from asthenospheric mantle beneath a thick lithosphere. On the other hand, the South CVB consists of both alkali and sub-alkali lavas (alkali basalts, tholeiites and basaltic andesites) that display generally higher SiO2, Sm/Nd, Ba/Nb, Th/U, and lower Nb/Th, La/Sm and more enriched Sr-Nd-Hf isotopic compositions (Sr-87/Sr-86 = 0.7038-0.7056, epsilon(Nd) = -2.4- + 3.2; epsilon(Hf) = 3-8.2). These rocks may have been produced by larger degrees of partial melting of asthenospheric mantle beneath a relatively thin lithosphere. Ancient metasomatized lithospheric mantle might also have contributed to their genesis. In addition, the similar ranges of Mn, Ni and Fe/Mn for olivine phenocrysts from both the North and the South CVB suggest that they may have been derived from hybrid mantle sources containing similar proportions of peridotite and pyroxenite/eclogite components. We propose that decompression melting of upwelling asthenosphere and mechanical-chemical erosion of basal lithosphere related to lithosphere-asthenosphere interaction responsible for the genesis of the CVB magmas were likely associated with upper mantle convection and back-arc extension induced by deep subduction of the Pacific plate and its stagnancy in the transition zone.

关键词Cenozoic Basalt Intraplate Volcanism Lithospheric Thinning Lithosphere-asthenosphere Interaction Northeastern China
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/8850
专题矿床地球化学国家重点实验室
作者单位1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
3.State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
4.Radiogenic Isotope Facility, School of Earth Sciences, The University of Queensland, Brisbane, QLD 4072, Australia
推荐引用方式
GB/T 7714
Song-Yue Yu,Yi-Gang Xu,Sheng-Hua Zhou,et al. Late Cenozoic basaltic lavas from the Changbaishan-Baoqing Volcanic Belt, NE China: Products of lithosphere-asthenosphere interaction induced by subduction of the Pacific plate[J]. Journal of Asian Earth Sciences,2018,164:260–273.
APA Song-Yue Yu.,Yi-Gang Xu.,Sheng-Hua Zhou.,Jiang-Bo Lan.,Lie-Meng Chen.,...&Yue-Xing Feng.(2018).Late Cenozoic basaltic lavas from the Changbaishan-Baoqing Volcanic Belt, NE China: Products of lithosphere-asthenosphere interaction induced by subduction of the Pacific plate.Journal of Asian Earth Sciences,164,260–273.
MLA Song-Yue Yu,et al."Late Cenozoic basaltic lavas from the Changbaishan-Baoqing Volcanic Belt, NE China: Products of lithosphere-asthenosphere interaction induced by subduction of the Pacific plate".Journal of Asian Earth Sciences 164(2018):260–273.
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