[S-CG64] 海洋底地球科学

[SCG64-18] 中央インド洋海嶺南部でのマントル不均質の分布

*佐藤 暢¹、町田 嗣樹²、仙田 量子³ (1.専修大学、2.早稲田大学、3.海洋研究開発機構)

Recent petrological and geochemical investigations of MORB at the southern segments of Central Indian Ridge (CIR) reveal the heterogeneous distributions of MORB-source mantle (Sato et al., 2015). Sato et al. (2015) concluded that MORB from CIR-S2 segment and off-ridge area at the CIR-S1 segment are depleted compositions than typical MORB. Furthermore, depletions based on trace element geochemistry of off-ridge MORB from CIR-S1 segment decrease toward present spreading ridge. Because off-ridge MORB was recovered from several dredge sites parallel to the flow line, these distributions might indicate spatial distributions of mantle heterogeneity beneath CIR-S1 segment.