Abstract
Major element compositions of garnet, clinopyroxene, orthopyroxene and spinel in the garnet-bearing lower crust and upper mantle xenoliths from Hannuoba, North China craton are analyzed by the electron microprobe (EMP). The pressure-temperature estimates reveal the increasing temperature and pressure from core to rim for granulites. In contrast, mantle xenoliths with core temperature > 930°C recorded a history of decrease in temperature and pressure. However, those with core temperature < 930°C show a negligible change. The final pressures recorded by these xenoliths cluster at 0.9–1.5 GPa. The presence of highNa 2O cpx in granulite xenoliths suggests that they are products of the transition from granulite to eclogite metamorphism corresponding to the increasing temperature and pressure. Together with previous studies, it is suggested that the P-T changes preserved in the xenoliths are related to lithospheric thickening and subsequent thinning prior to their eruption in the Cenozoic.
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Liu, Y., Gao, S., Liu, X. et al. Thermodynamic evolution of lithosphere of the North China craton: Records from lower crust and upper mantle xenoliths from Hannuoba. Chin.Sci.Bull. 48, 2371–2377 (2003). https://doi.org/10.1360/03wd0133
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DOI: https://doi.org/10.1360/03wd0133