Abstract
The hydrogen isotope composition of a mantle-derived mica megacryst from Cenozoic basanite from Nushan, Anhui Province has been determined by ion micro probe. The results demonstrate that δ D and water content of the megacryst were heterogeneous on the micro scale, which resulted from reaction with meteoric water after being brought to the surface. The primary δD of mica megacrysts was about - 23‰, suggesting the recycled crustal materials in its source. By combining these values with those of other researchers, it is believed that the hydrogen isotope composition of the mantle is heterogeneous at least on the large scale.
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