Dehydration and melting process in deep subduction zone-Zircon geochemistry from the Sanbagawa eclogite-

点击翻译按钮获取中文摘要

Partial melting texture was discovered from the Sanbagawa eclogoite which had been subducted down to upper mantle at Cretaceous time. Zircons were separated from the eclogite. The zircons exhibit sector zoning on the core to mantle under the CL images. SHRIMP U-Pb age dating and REE analysis from the zircons indicate that the partial melting had occurred in the case of young (hot) slab at upper mantle depth. The melting reaction was due to phengite decomposition. The zircon and the garnet were grown together in the presence of melt.