大陆板片-地幔相互作用:来自大别造山带碰撞后安山质火山岩的地球化学证据

赵子福; 代富强; 陈启

doi:10.3799/dqkx.2019.244

Volume 44 Issue 12

Dec. 2019

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Article Navigation > Earth Science > 2019 > 44(12): 4119-4127

Zhao Zifu, Dai Fuqiang, Chen Qi, 2019. Continental Slab-Mantle Interaction: Geochemical Evidence from Post-Collisional Andesitic Rocks in the Dabie Orogen. Earth Science, 44(12): 4119-4127. doi: 10.3799/dqkx.2019.244

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Zhao Zifu, Dai Fuqiang, Chen Qi, 2019. Continental Slab-Mantle Interaction: Geochemical Evidence from Post-Collisional Andesitic Rocks in the Dabie Orogen. Earth Science, 44(12): 4119-4127. doi: 10.3799/dqkx.2019.244

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Continental Slab-Mantle Interaction: Geochemical Evidence from Post-Collisional Andesitic Rocks in the Dabie Orogen

doi: 10.3799/dqkx.2019.244

Zhao Zifu^{1,2
,
,},
Dai Fuqiang^1,3,
Chen Qi¹

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 for Excellence in 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: 2019-09-02
Publish Date: 2019-12-15

Abstract

Abstract

Crustal material subducted to mantle depths inevitably interacted with the mantle wedge at the slab-mantle interface. This may generate a variety of ultramafic metasomatites that served as the mantle source of mafic igneous rocks in collisional orogens. Therefore, mafic igneous rocks in collisional orogens are the important target to study the recycling of subdcuted crustal materials and its associated crust-mantle interaction. In order to decipher the mechanism and processes of the recycling of subducted continental crustal materials, a combined study of element and isotope geochemistry was performed for post-collisional andesitic volcanics from the Dabie orogen, China. SIMS zircon U-Pb ages for these volcanic rocks are 124±3 to 130±2 Ma, indicating that they formed at Early Cretaceous. In addition, the relict zircons have Middle Neoproterozoic and Triassic U-Pb ages, respectively, corresponding to the ages of protolith formation and ultrahigh-pressure metamorphism (UHP) for UHP metaigenous rocks in the Dabie-Sulu orogenic belt. They have island-arc basalts (IAB)-like trace-element patterns, enriched Sr-Nd-Hf isotope compositions, and variable zircon δ¹⁸O values mostly different from the normal mantle. These element and isotope features indicate that the post-collisional andesitic volcanics are the products of partial melting of metasomatically enriched orogenic lithospheric mantle. During the Triassic subduction of the South China block (SCB) beneath the North China block (NCB), the overlying NCB lithospheric mantle wedge peridotite was metasomatized by felsic melts originated from the subdcuted SCB continental crust, the melt-peridotite reaction in the continental subduction channel generated fertile and enriched metasomatites of mafic composition. Partial melting of such metasomatites in the Early Cretaceous gave rise to these andesitic volcanics. Therefore, the mantle sources for post-collisional mafic igneous rocks in collisional orogens would be generated by the slab-mantle interaction in continental subduction channel, and the lithochemical and geochemical composition of these mafic rocks is dictated by the proportion of felsic melts incorporating into the mantle wedge.
- andesitic rocks,
- collisional orogens,
- slab-mantle interaction,
- melt-peridotite reaction,
- subduction channel,
- geochemistry

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References(62)

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