Presentation Information
[R7P-11]Antient mantle melting event left in peridotite xenoliths from Tahiti Island
*Norikatsu Akizawa1, Akira Ishikawa2, Tetsu Kogiso3 (1. Tokyo Univ. AORI, 2. Earth and Planetary Sci., Tokyo Tech., 3. Grad. Sch. Hum. and Environ. Stud., Kyoto Univ.)
Keywords:
Ancient mantle domain,Re-Os isotopes,highly siderophile elements,harzburgite,dunite
Abyssal peridotites are fragments of the uppermost mantle in the oceanic region. They record melting events at the ridges and paleo-melting events somewhere other than the ridges. However, the understanding of paleo-melting events are not sufficiently advanced since the occurrence of the abyssal peridotites are limited in the oceanic region. Here, we attempted to elucidate the paleo-melting events and timing by analyzing the Os isotope composition and highly siderophile element compositions of peridotite xenoliths from Tahiti, Society Islands.
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