中国东部新生代玄武岩记录古太平洋俯冲带壳幔相互作用

徐峥; 郑永飞

doi:10.3799/dqkx.2019.273

Volume 44 Issue 12

Dec. 2019

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Article Navigation > Earth Science > 2019 > 44(12): 4135-4143

Xu Zheng, Zheng Yongfei, 2019. Crust-Mantle Interaction in the Paleo-Pacific Subduction Zone: Geochemical Evidence from Cenozoic Continental Basalts in Eastern China. Earth Science, 44(12): 4135-4143. doi: 10.3799/dqkx.2019.273

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Xu Zheng, Zheng Yongfei, 2019. Crust-Mantle Interaction in the Paleo-Pacific Subduction Zone: Geochemical Evidence from Cenozoic Continental Basalts in Eastern China. Earth Science, 44(12): 4135-4143. doi: 10.3799/dqkx.2019.273

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Crust-Mantle Interaction in the Paleo-Pacific Subduction Zone: Geochemical Evidence from Cenozoic Continental Basalts in Eastern China

doi: 10.3799/dqkx.2019.273

Xu Zheng^{1,2,3
,
,},
Zheng Yongfei^1,2

1.
CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China
2.
Center of Excellence for Comparative Planetology, Chinese Academy of Sciences, Hefei 230026, China
3.
State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China

Received Date: 2019-10-01
Publish Date: 2019-12-15

Abstract

Abstract

Continental basalts,erupted in either rift or flood mode,usually show oceanic island basalt (OIB)-like geochemical compositions,with the presence of crustal components in the mantle sources of OIB. However,it is uncertain for OIB when and how the crustal components were incorporated into the mantle sources. In comparison,the formation of continental basalts is associated with specific settings for subduction of oceanic slabs and its interaction with the mantle. In this regard,a geochemical study of continental basalts can provide insights into the crust-mantle interaction in oceanic subduction channels. This is illustrated for the geochemistry of Cenozoic continental basalts in eastern China. These basalts are characterized by OIB-like trace element compositions and depleted to weakly enriched Sr-Nd isotope compositions. After precluding the effect of crustal contamination,the geochemical features of these basalts can be interpreted by recycling of crustal components into their mantle sources. The subducting oceanic crust is the major source of crustal components. In addition to both igneous oceanic crust and seafloor sediment,the lower continental crust of the overriding continental margin was offscrapped into the mantle sources. There are a series of differences in Pb isotope compositions between the Cenozoic basalts in North and South China,suggesting a difference in the nature of crustal components between these two areas. The mantle sources of Cenozoic continental basalts were produced by the crust-mantle interaction in the oceanic subduction zone during the Mesozoic subduction of paleo-Pacific slab beneath the Euroasian continent. Hydrous melts were produced by partial melting of the subducting oceanic crust at postarc depths. They were then reacted with the overlying mantle wedge to generate metasomatic domains,whose partial melting in the Cenozoic give rise to the continental basalts.
- continental basalts,
- oceanic slab,
- subduction zone,
- crust-mantle interaction,
- petrology

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References(45)

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