| Citation: |
Zhuang Li, Bin Chen, 2021. Tracing crustal contamination of the Cenozoic basalts with OIB-affinity in northern marginal region of North China Craton: An Os perspective, China Geology, 4, 593-599. doi: 10.31035/cg2020052
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Tracing crustal contamination of the Cenozoic basalts with OIB-affinity in northern marginal region of North China Craton: An Os perspective
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Abstract
The Cenozoic basalts with OIB-affinity in northern marginal region of the North China Craton are thought to experience minor even no crustal contamination during the magma evolution. The whole-rock Sr-Nd-Pb-Hf isotopes are attributed to a two-component mixing between depleted and enriched mantle sources, while the major element variations are controlled by the fractional crystallization of olivine and clinopyroxene. However, in this study, the new Os isotopic data proposes an opposite model for the Cenozoic basalts in northern marginal region of the North China Craton. In this model, the Jining basalts were contaminated by the Archean mafic rocks during the magma storage and ascent. The crustal contamination process is supported by (1) the highly radiogenic Os isotopic compositions, and (2) the positive correlation between 187Os/188Os and 1/Os of the Jining basalts. By modeling the Os isotopic composition of the basalts, an incorporation of < 10% mafic granulites/amphibolites to the parental magma can successfully explain the initial values of highly radiogenic Os. In contrast, the unradiogenic and uniform Os isotopic compositions of the Chifeng basalts suggest negligible crustal contamination. Os isotopic data acts as an indicator of crustal contamination during magma evolution, providing us a novel insight into the evolution of the intra-continental OIB-like basalts worldwide.
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References
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Zhuang Li, Bin Chen, 2021. Tracing crustal contamination of the Cenozoic basalts with OIB-affinity in northern marginal region of North China Craton: An Os perspective, China Geology, 4, 593-599. doi: 10.31035/cg2020052
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Figure 1.
Sketch map of major tectonic divisions of eastern China and the distribution of the Cenozoic basalts (modified from Guo PY et al., 2016; Zhang WH et al., 2012).
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Figure 2.
(a) Os vs. Ni correlation and (b) Os vs. Cr correlation for the Cenozoic basalts in northern marginal region of the North China Craton.
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Figure 3.
(a) 187Os/188Os vs. 1/Os for the Cenozoic basalts in northern marginal region of the North China Craton. The linear relation indicates that crustal contamination accounts for the variation of Os isotope and content. (b) 187Os/188Os vs. Mg# for the Cenozoic basalts in northern marginal region of the North China Craton.
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Figure 4.
Binary mixing between mantle-derived parental magma and potential crustal contaminants.