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The longevity of subcontinental lithospheric mantle beneath Jiangsu-Anhui Region

—The Os isotope model age of mantle-derived peridotite xenoliths

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Abstract

The basalt-borne peridotite xenoliths from Jiangsu-Anhui provinces were analyzed for whole rock Os isotopic compositions in two laboratories of USTC, China and CRPG, France, respectively. The187Os/188Os ratio of the sample set ranges from 0.119 to 0.129 (25 samples, USTC) and from 0.117 to 0.131 (17 samples, CRPG). The Os isotopic compositions of most samples are less than 0.129 and depleted relatively to the primitive mantle, showing a good correlation with the major element compositions. With the187Os/188Os-Al2O3 alumichron, the samples yield a model age of 2.5 ± 0.1 Ga (data of USTC) and 1.9 ± 0.1 Ga (data of CRPG), late Archean to early Pro-terozoic. The two samples with the lowest187Os/188Os ratio (0.119 and 0.117) have the TRD (Re depleted age) of 1.1 Ga (USTC) and 1.4 Ga (CRPG), mid-Proterozoic. The Os isotope model age shows that the peridotite xenoliths from Cenozoic alkali basalt in Jiangsu-Anhui provinces have an old formation age (early- to mid- Proterozoic). They are not newly produced mantle after the Phanerozoic replacement of the lithosphere mantle, but residual fractions of Proterozoic mantle.

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Authors and Affiliations

  1. Department of Earth and Space Sciences, University of Science and Technology of China, China

    Xiachen Zhi, Zicheng Peng, Daogong Chen, Chunjiang Yu & Weidong Sun

  2. Laboratory of Chemical Geodynamics, USTC, China

    Xiachen Zhi, Zicheng Peng, Daogong Chen, Chunjiang Yu & Weidong Sun

  3. Advance Research Center for Earth Science and Astronomy, USTC, Third World Academy of Sciences, 230026, Hefei, China

    Xiachen Zhi, Zicheng Peng, Daogong Chen, Chunjiang Yu & Weidong Sun

  4. CRPG, CNRS, 15 Rue Notre-Dame des Pauvres, B. P. 20, 54501, Vandoeuvre-les-Nancy, France

    Laurie Reisberg

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  1. Xiachen Zhi
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Correspondence to Xiachen Zhi.

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Zhi, X., Peng, Z., Chen, D. et al. The longevity of subcontinental lithospheric mantle beneath Jiangsu-Anhui Region. Sci. China Ser. D-Earth Sci. 44, 1110–1118 (2001). https://doi.org/10.1007/BF02906867

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