R7: Petrology, Mineralogy and Economic geology (Joint Session with Society of Resource Geology)

[R7-06] Melt incusions containing platinum group minerals in Tahitian mantle xenolith

[Presentation award entry]

*Itaru Mitsukawa¹, Tetsu Kogiso¹, Norikatsu Akizawa², Tomoki Taguchi³, Kentaro Uesugi⁴, Akihisa Takeuchi⁴, Masanori Yasutake⁴, Akira Tsuchiyama^5,6, Megumi Matsumoto⁷, Junya Matsuno⁶, Shota Okumura¹, Yohei Igami¹, Akira Miyake¹ (1. Kyoto Univ., 2. Univ. of Tokyo, 3. Waseda Univ., 4. SPring-8/JASRI, 5. Guangzhou Inst. of Geochem., CAS, 6. Ritsumeikan Univ., 7. Tohoku Univ.)

Keywords:Platinum Group Minerals, Bitumen, Melt inclusions, Raman spectroscopy, Tahiti Island

Platinum Group Elements (PGE) are important geochemical tracers to constrain Earth's early history. Recently, melt inclusions containing much platinum group minerals are found in a Tahitian harzburgite xenolith. They coexist with Fe-Ni-Cu sulfides, silicate glass and "vapor-like phase". We applied Raman spectroscopy to "vapor-like phase" and obtained spectra resembling to bitumen. However, we couldn't obtain significant signal of carbon with STEM-EDS analysis and "vapor-like phase" should be analyzed more in detail.