[S-IT09] Hard-Rock Drilling: Oceanic Lithosphere to Continental Crust Formation

[SIT09-03] Physical properties of fore-arc basalt and boninite recovered by IODP EXP352 and its significance for the seismic velocity structure in the oceanic crust

*道林 克禎¹、本多 睦美²、山本 由弦³、神谷 奈々⁴、柵山 徹也⁵、渡辺 了⁶ (1.静岡大学学術院理学領域、2.静岡大学大学院総合科学技術研究科理学専攻地球科学コース、3.海洋研究開発機構数理科学・先端技術研究分野、4.日本大学大学院総合基礎科学研究科、5.大阪市立大学大学院理学研究科、6.富山大学大学院理工学研究部)

キーワード：IODP EXP352, Physical property

Physical properties of the cores recovered by IODP EXP352 were characterized through a set of measurements on whole core sections and discrete samples. Gamma ray attenuation density (GRA), magnetic susceptibility (MS) and P-wave velocity (PWL) of the cores were obtained using the Whole-Round Multisensor Logger (WRMSL). Natural gamma radiation (NGR) was measured by the Natural Gamma Radiation Logger (NGRL). Point magnetic susceptibility (PMS), reflectance spectroscopy and colorimetry (RCS) data were acquired using the SHMSL. Thermal conductivity (TCON) and moisture and density (MAD) were obtained on sections and discrete samples, respectively. All raw data were subsequently “filtered” to remove spurious points that correspond to empty intervals in the liner or broken pieces. We have mainly studied the relationships among P-wave velocity, density, prosity and magnetic suscepetibility. We show that the physical properties are useful dataset for the interpretation of the layer 2 (i.e. volcanic rocks) in the seismic velocity structure of the oceanic crust.