Age and geochemistry of Silurian gabbroic rocks in the Tongbai orogen, central China: implications for the geodynamic evolution of the North Qinling arc–back-arc system

H. Wang, Y.B. Wu, Z.W. Qin, L.Q. Zhu, Q. Liu, X.C. Liu, J. Gao, J.R. Wijbrans, H.J. Gong, H.L. Yuan

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

The tectonic properties of the Erlangping unit and the subduction polarity of oceanic basins in the North Qinling-Tongbai orogen have been the focus of debate for more than twenty years. The resolution of these controversies hinges on the refined constraints on the location and nature of subduction-related magmatism. In this contribution, we provide a combined study of zircon U-Pb ages, major and trace element geochemistry, and Sr-Nd-Hf isotope compositions of gabbroic rocks from the Erlangping unit in the Tongbai orogen. U-Pb dating of zircons from two gabbroic diorite samples yielded two weighted mean ages of 443±3 and 440±4Ma. The Erlangping gabbroic rocks are tholeiitic in composition with variable MgO (4.48-8.17%), and low K
Original languageEnglish
Pages (from-to)1-15
JournalLithos
Issue number179
DOIs
Publication statusPublished - 2013

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