SUBDUCTION OF BACK-ARC BASIN AND RECYCLING OF CRUSTAL SUBSTANCE IN NORTHERN QINLING
Abstract：Major and trace element compositions and isotopic compositionsfor Taoyuan intrusion and Huanggang intrusive complex are presented in this paper. The geochemical research into the Taoyuan intrusion and Huanggang intrusive complex in the Caledonian stage, north of Tongbai shows that the Taoyuan granitic magma derived from the depleted mantle are similar to the Erlangping basic volcanic magma. The Taoyuan granites that occurred in the back-arc basin related to the subdcution of the ocean plate originated from the same magma as those of Erlangping basic volcanic rocks. The Huanggang intrusive complex, closely related to the northward subduction of the Erlangping back-arc basin, was formed in the island-arc tectonic environment. The magmas of Huanggang are mixed with a certain percentage of continental crustal substances, products of the partial melting of the mantle wedge enhanced by the fluid extracted from the subducted slab and the overlying crustal substance in the subduction process.
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Publication Date：2001-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 18-24 )