Abstract
Cenozoic basalts are widely distributed in eastern China, and some of them contain zircon megacrysts which are considered to be constituent mineral of the subcontinental lithospheric mantle (SCLM) and petrogenetically related to mantle metasomatism induced by addition of crustal materials. Using the Laser Ablation Multiple Collector Inductively Coupled Plasma Mass Spectrometry (LA-MC-ICPMS), zircon megacrysts from the Cenozoic basalts at Changle in Shandong, Mingxi in Fujian, and Penglai in Hainan provinces have been used for Hf isotopic analyses. The data indicate that there is no significant deviation for the different zircon grains in each locale, except those from Penglai. The obtained176Hf /177Hf ratios are 0.28302–0.28308 for Changle, 0.28297–0.28300 for Mingxi, and 0.28288–0.28293 for Penglai, with correspondingεHf values of 8.7–10.8, 7.0–7.9, and 3.9–5.7, respectively. These data display that there existed some regional heterogeneity, but the Hf model ages clustere in the Phanerozoic. Therefore, it is inferred that metasomatism of the lithospheric mantle beneath eastern China took place in the Phanerozoic, most probably in the Mesozoic-Cenozoic. However, the formation time of the lithospheric mantle is not clearly constrained based on the present Hf isotopic data.
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Qiu, Z., Wu, F., Yu, Q. et al. Hf isotopes of zircon megacrysts from the Cenozoic basalts in eastern China. Chin. Sci. Bull. 50, 2602–2611 (2005). https://doi.org/10.1007/BF03183658
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DOI: https://doi.org/10.1007/BF03183658