S2: Water Rock Interaction (Special Session)

[S2-02] _{Occurrence and mineralogy of smectite in petit-spot basalts from the Northwest Pacific}

[Presentation award entry]

*Taro KIDO¹, Norikatsu AKIZAWA², Yohey SUZUKI¹ (1. Univ. Tokyo, Sci., 2. Univ. Tokyo, AORI)

Keywords:mantle xenolith, low-temperature alteration, montmorillonite, clay minerals

The clay fraction in petit-spots basalts was characterized using X-ray diffraction (XRD), micro-infrared spectroscopy (micro FT-IR), and scanning electron microscopy attached to an energy-dispersive X-ray spectrometer (SEM-EDS). These results revealed the formation of montmorillonite, an Al-rich smectite, in the petit-spot basalts.