[M-IS03] Developments and applications of XRF-core scanning techniques in natural archives

[MIS03-P01] Reconstruction of variations in South Pacific westerly jet path during the last glacial and calibration for the water content influence of ITRAX intensity

★Invited Papers

*長谷川 精¹、長屋 芙結¹、長島 佳菜²、勝田 長貴³、村山 雅史⁴、原田 尚美² (1.高知大学理工学部、2.JAMSTEC、3.岐阜大学教育学部、4.高知大学農林海洋学部)

キーワード：偏西風、チリ沖、最終氷期、ITRAX、含水率補正

We present results of XRF core scanner (ITRAX) analysis on a marine sediment core (MR16-09 PC02) obtained from coastal southern Chile (46S, 76W, 2793 m depth). The study site is located near the boundary of present-day South Pacific summer and winter westerly jet path. Thus, the compositional change of studied core thought to record latitudinal changes of Southern westerly that influence rainfall patterns and water discharges of southern Chile. ITRAX analysis was performed at Center for Advanced Marine Core Research, Kochi University. Using method of Katsuta et al. (2019), water content-corrected μ-XRF intensities of wet sediment cores were converted elemental concentrations (dry weight %). Based on the obtained elemental composition, we reconstructed multi-millennial-scale variations in terrestrial detrital inputs, which likely record variations in westerly jet path during the last glacial.

Katsuta N. et al. (2019) Sedimentology 66, 2490-2510.