Comprehensive refertilization of lithospheric mantle beneath the North China Craton: further Os–Sr–Nd isotopic constraints

Journal of the Geological Society - Tập 166 Số 2 - Trang 249-259 - 2009
Hongfu Zhang1, S. L. Goldstein2, Xinhua Zhou1, Min Sun3, Yue Cai2
1State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences,PO Box 9825, Beijing 100029, China
2Lamont–Doherty Earth Observatory and Department of Earth and Environmental Sciences, Columbia University, 61 Rt. 9W, Palisades, NY 10964, USA
3Department of Earth Sciences, University of Hong Kong, Pokfulam Road, Hong Kong, China

Tóm tắt

Abstract: Mantle peridotitic xenoliths in Cenozoic basalts from Hannuoba, on the northern margin of the Archaean North China Craton, have variable Re (0.01–0.30 ppb) and Os (2.7–6.2 ppb) abundances and 187 Os/ 188 Os (0.1138–0.1236) ratios. These xenoliths yield a range of Proterozoic Re depletion ages of 0.8–2.2 Ga that show a general correlation with olivine Fo. Mantle xenoliths in Cenozoic basalts from the centre and southern margin of the North China Craton also overwhelmingly show Proterozoic Re depletion ages that correlate with olivine Fo. These Re–Os age features are completely different from those of Palaeozoic kimberlite-borne peridotitic xenoliths, which have Archaean ages. This age distinction between xenoliths associated with Palaeozoic and Cenozoic volcanism indicates that the present-day lithospheric mantle was dominantly not newly accreted during the Phanerozoic but instead was transformed from the ancient lithospheric mantle by interaction with melts. The Re–Os data in combination with the geochemical and Sr–Nd isotopic features of peridotitic xenoliths from the Cenozoic basalts of the North China Craton demonstrate the presence of multiple stages of mantle metasomatic overprints in the lithospheric mantle. This study thus further indicates that lithospheric transformation through melt–rock interaction could be an important mechanism for compositional refertilization during the Phanerozoic. Supplementary material: Analytical methods and geochemical data are available at http://www.geolsoc.org.uk/SUP18334 .

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