[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

*Hitoshi Hasegawa¹, Fuyu Nagaya¹, Kana Nagashima², Nagayoshi Katsuta³, Masafumi MURAYAMA⁴, Naomi Harada² (1.Faculty of Science and Technology, Kochi University, 2.JAMSTEC, 3.Faculty of Education, Gifu University, 4.Faculty of Agriculture and Marine Science, Kochi University )

Keywords:Westerly wind, Off-Chile, Last glacial, ITRAX, Calibration for the water content influence

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.