大别造山带天柱山中生代中酸性岩成因的REE配分定量模拟

徐小军; 赵子福; 郑永飞; 魏春生

Volume 30 Issue 6

Jun. 2005

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Article Navigation > Earth Science > 2005 > 30(6): 721-728

XU Xiao-jun, ZHAO Zi-fu, ZHENG Yong-fei, WEI Chun-sheng, 2005. Quantitative REE Modeling for Genesis of Mesozoic Intermediate-Felsic Rocks at Tianzhushan in the Dabie Orogen. Earth Science, 30(6): 721-728.

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Quantitative REE Modeling for Genesis of Mesozoic Intermediate-Felsic Rocks at Tianzhushan in the Dabie Orogen

CASKey Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China

Received Date: 2005-07-20
Publish Date: 2005-11-25

Abstract

Abstract

A large number of studies of geochronology and geochemistry indicate that Mesozoic intermediate-felsic rocks from the Dabie orogen have originated from recycling of the subducted Yangtze continental crust itself. A REE partition simulation suggests that the Tianzhushan intermediate rocks can be generated by partial melting, in coupling with fractional crystallization, of dioritic gneiss which is similar in chemical compositions to the mafic rocks in the lower crust in North Dabie; partial melting of intermediate grey gneiss which is similar in chemical compositions to the middle crust in North Dabie can generate the Tianzhushan felsic rocks. Quantitative calculation of trace element content for the residue after partial melting suggests that intermediate-mafic granulites outcropped in the Dabie orogen are not the residue of partial melting. The residue formed by partial melting of thickened crust due to anomalous heat supply by mantle superwelling at Early Cretaceous is possibly easy to detach from the crust because of its high density, leading to the remove of mountain root and large scale uplift of the orogen.
- intermediate-felsic rock,
- Mesozoic,
- REE,
- quantitative modeling,
- Dabie orogen

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References(54)

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Quantitative REE Modeling for Genesis of Mesozoic Intermediate-Felsic Rocks at Tianzhushan in the Dabie Orogen

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