Oxygen isotopic compositions of zircons from pyroxenite of Daoshichong,Dabieshan: Implications for crust-mantle interaction |
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Authors: | Qunke Xia E Deloule Yuanbao Wu Daogong Chen Hao Cheng |
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Institution: | (1) Department of Earth and Space Sciences, University of Science and Technology of China, 230026 Hefei, China;(2) CRPG-CNRS, BP20, 54501 Vandoeuvre Cedex, France |
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Abstract: | Oxygen isotopic compositions of zircons from pyroxenite (∼145 Ma) of Daoshichong, Dabieshan have been measured by an ion microprobe.
Both within the single grain and among different grains, oxygen isotopic ratios are homogeneous, δ18O = (7.66‰±0.46) & (1 SD, 1 σ = 0.10, n = 22). High δ18O values indicate that the mantle-derived parent magma of Daoshichong pyroxenite have undergone interaction with crustal materials.
Combing with other geochemical constraints, the way of crust-mantle interaction is suggested to be source mixing other than
crustal contamination. The time interval between crust-mantle interaction and formation of the parent magma of Daoshichong
pyroxenite is less than several million years. The crustal component involving in crust-mantle interaction is mafic lower
crust, and the parent magma of pyroxenite possibly contain large proportion (>37%) of such lower crust. |
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Keywords: | zircon oxygen isotope ion microprobe Daoshichong Dabieshan |
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